Glossary of Terms
A process of increasing the hardness and strength by the precipitation of particles of a phase from a supersaturated solid solution alloy. The hardening cycle usually consists of heating or annealing at a temperature sufficiently high to maintain solid solution, rapid cooling, or quenching to retain the supersaturated solid solution, and subsequent heating at a temperature lower than the solution anneal to effect the precipitation.
A substance having metallic properties and composed of two or more elements, at least one of which is a metal.
The name of a phase or of a certain range of copper alloys which contains one or more alloying elements dissolved in copper, the phase being a homogeneous solid solution.
A process involving heating and cooling designed to effect: 1) softening of a cold-worked structure by recrystallization or grain growth or both; 2) softening of an age-hardened alloy be causing a nearly complete precipitation of the second phase in relatively coarse form; 3) softening of certain age-hardenable alloys by dissolving the second phase and cooling rapidly enough to obtain a supersaturated solution; 4) relief of residual stress.
1) In corrosion processes, usually the metal that has the greater tendency to dissolve. 2) In electro-plating, the positive electrode used in a plating bath.
In an identification hardness test, the bulge formed on the anvil side of the specimen which indicates that the hardness determination is of questionable accuracy.
A cylindrical core around which metal is wound to obtain a desired inside diameter of the wound coil or roll.
The decrease in cross-section of a product by rolling or drawing. This is a measure of the temper of metal in the cold worked condition.
A condition of a metal mill product resulting from hot rolling; soft, not cleaned nor drawn or rolled to size.
Abbreviation for “American Society for Testing and Materials.”
A solid rectangular section, or one with two plane parallel surfaces and round or other simple regularly shaped edges, up to and including 12" in width and over 0.188" in thickness. 1) Bar, Cast - Flat castings for rolling into sheet and strip. 2) Bar, Bus Stock - High conductivity copper bar stock of any dimension intended for use as an electrical conductor. Normally drawn to cross section.
A method of plating small parts in which the parts are placed in a perforated barrel, which revolves partially submerged in a plating solution.
The name of a second phase in the internal structure of certain copper alloys, generally harder and less ductile than the alpha phase. The beta phase renders the alloy more ductile when hot and less ductile when cold.
A piece from any wrought product intended for subsequent fabrication by such operations as forming, bending, cupping, drawing, and hot pressing.
The process of cutting metal blanks by a die and punch set in a press, or by sawing or shearing.
A void in, or raised spot on the surface of a metal, caused by expansion of entrapped gas in the metal.
Any copper alloy with zinc as the principal alloying element, with or without small quantities of some other element.
Originally a term for copper alloys having tin as the only or principal alloying element. In modern usage the term "Bronze" is seldom used alone, and in the terms "Phosphor Bronze" or "Tin Bronze" is used for indicating copper-tin alloys. In fact, the term "Bronze", together with a suitable modifying adjective has in recent years been extended to apply to any of a great variety of copper alloys.
Alternate bulges and hollows recurring along the length of a flat product with the edges remaining relatively flat.
The finishing of metal surfaces by rubbing with a compound applied to the pliable rim of a wheel usually consisting of a large number of treated or untreated muslin discs sewed together, and which rotates at high speed. Coloring and cutting are two types of buffing procedures.
The expanding of a portion of the body of a drawn shell below the top or neck.
A fabrication method of securing a smooth finished surface by slight deformation with highly polished tools.
The thin ridge or roughness left by a cutting operation such as slitting, shearing, blanking, or sawing.
Rigid, high conductivity copper electrical conductor or tubular or solid section.
A cast shape, rectangular in cross-section, for rolling.
See "Edgewise Curvature".
An article formed by solidification of molten metal in a mold.
Reduction or prevention of corrosion of a metal surface by making it a cathode, for example by the use of sacrificial anodes or impressed currents.
Abbreviation for “Copper Development Association, Inc.”
A series of transverse ripples encircling a drawn product visible on outer or inner surfaces.
A length of flat rolled product wound into a cylindrical spiral.
Effective straight section of metal at coil O.D
A process of impressing images or characters from a die onto plain metal surfaces.
1) A discontinuity that appears on the surface of cast metal as a result of two streams of liquid metal meeting and failing to unite. 2) On a forging, a portion of the surface that is separated by oxide from the main body of the metal. See Lap.
The process of changing the form or cross-section of a piece of metal at a temperature below the softening or recrystallization point, but commonly at or about room temperature. It includes rolling, drawing, pressing, and stretching.
The external hydrostatic or pneumatic pressure required to collapse a tube or other hollow article.
See Tube Measurement Terms.
See Tube, Heat Exchanger Tube.
Plate manufactured to special thickness tolerances and furnished in various contours as tube sheets or head plates in condensers and heat exchangers.
See Tube, Copper Water Tube
See Tube, Copper Water Tube
The deterioration or failure of metals and alloys by chemical or electro-chemical processes. 1) Dealuminification - A phenomenon somewhat similar to dezincification involving loss of aluminum. 2) Denickelification - A phenomenon somewhat similar to dezincification involving loss of nickel. 2) Denickelification - A phenomenon somewhat similar to dezincification involving loss of nickel. 4) Erosion - The abrasion of metal or other material by liquid or gas, usually accelerated by presence of solid particles of matter in suspension, and sometimes by corrosion. a) Cavitation - The damage caused to a material by a moving liquid and associated with the formation and collapse of cavities in the liquid at the solid-liquid interface. b) Impingement Attack - A type of localized corrosion caused by the striking of a liquid, containing entrained gases, on a metal surface. 5) Stress Corrosion - Spontaneous failure of metals by cracking under combined action of corrosion and stress, residual or applied. See Season Cracking.
The deterioration of properties resulting from repeated stressing of a metal in a corrosive medium. The rate of deterioration is greater than that resulting from either repeated stressing or corrosion alone.
The flow or plastic deformation of metals held for long periods of time at stresses lower than the normal yield strength. The effect is particularly important if the temperature of stressing is in the vicinity of the recrystallization temperature of the metal. Also see Tests.
The variation in thickness across the product from edge to center or edge to edge.
1) The procedure of bringing a product to desired dimensions by such operations as slitting, shearing, sawing, and blanking. 2) As applied to surface finishing--cutting through or removing the surface of a metal with a buffing wheel and suitable abrasive compound usually coarser than that used for buffing. See Buffing.
Removing rough or sharp edges left on metal by cutting operations.
A term applied to any metal or alloy to indicate that it has been treated to remove oxygen. It is specifically applied to copper and refers to removal of oxygen by means of phosphorous or other strong deoxidizing agents.
Average Inside or Average Outside - See Tube Measurement Terms.
Inside or Outside - See Tube Measurement Terms
A longitudinal scratch on the surface of any drawn product resulting from the use of a roughened die or from the drag of a foreign particle between die and product.
Any chemical solution used to produce a specific color or finish on copper or copper alloys. Also see Pickle.
The transverse departure of the concave surface from a straight line from edge to edge.
Slit strip showing abrupt change and reversal in longitudinal direction.
See Tube, Copper Drainage Tube, DWV.
1) The process of pulling flat products, rod wires, tube, shapes, etc., through a die. This effects a reduction in size or change in shape of the cross-section and hardens the metal. 2) The process of making articles in a press from blanks cut from flat products in which the gauge is reduced by pushing the metal between a punch and die to develop the sidewalls of the part.
The piercing of a hole and turning up a collar or flange, on sheet, strip, or articles made therefrom.
Also “Bright Rolled Finish.” See Finish.
The property of a metal that permits permanent deformation before fracture by stress in tension.
A wavy projection in a regular geometric pattern on the rim of drawn cups formed in the course of deep drawing, as a result of directional properties or anisotropy of the sheet.
See Finished Edges.
The lateral departure of the edges from a straight line, which may be unidirectional or reversing; in the latter case.
The permanent extension of a specimen which has been stretched to rupture in a tension test. The percentage elongation is an indication of ductility. See Tests, Tension.
The tendency for a metal to break under conditions of repeated cyclic stressing considerably below the ultimate tensile strength.
The condition of the surfaces of the products, produced by normal or special mill procedures. Several types of finishes can be produced as follows: 1) Acid Dipped-Dry, Rolled Finish - The finish obtained by cold dry rolling on polished rolls of material previously bichromate dipped or bright dipped, giving a burnished appearance and retaining the color obtained by dipping. 2) Bichromate Dipped Finish - A semi-matte finish approaching the true color of the metal, obtained by immersion in an aqueous solution of sodium bichromate and sulfuric acid to remove scale and oxide, using the following formula: sulfuric acid 12 ounces; sodium bichromate 4 ounces; water 1 gallon. 3) Bright Annealed Finish - The finish obtained by annealing under conditions of controlled atmosphere to prevent oxidation and to retain the original luster of the product. Also see Annealing. 4) Bright Dipped Finish - A bright finish having the true color of the metal obtained by immersion in an aqueous solution of sulfuric acid and nitric acid, using the following formula: sulfuric acid 2 gallons; nitric acid 1 gallon; water 1 to 2 quarts; hydrochloric acid 1/2 fluid ounce. 5) Bright Rolled Finish - See Dry Rolled Finish. 6) Brush Brass Finish - A frosted finish obtained on brass by brushing with a Tampico (Bristol brush) wheel treated with brush rouge and rotating at high speeds. 7) Buffed Surface Finish - The finish obtained by buffing with rouge or similar fine abrasive, resulting in a high gloss or polish. This may be applied in one operation or two, commonly known as cutting and coloring operations. 8) Clean Annealed Finish - A finish characterized by a light iridescent film generally obtained on copper alloys which have been annealed in a controlled atmosphere. 9) Cold Rolled Finish - The finish obtained by cold rolling of plain pickled strip with a lubricant; giving a relatively smooth appearance. In the case of sheet or strip, cold rolling may be done without any lubricant, the finish then being similar to that described under Dry Rolled Finish. 10) Dichromate Dipped Finish - See Bichromate Dipped Finish. 11) Drawn Finish - The finish obtained on tube, wire, and drawn rod, bar and strip by drawing through a die resulting in a relatively smooth and bright appearance. 12) Dry Rolled Finish (Bright Rolled Finish) a) The finish obtained by cold rolling on polished rolls without the use of any coolant or metal lubricant, on material previously plain pickled, bichromate, or bright dipped. b) The finish obtained by the rolling or tumbling of brass articles in a barrel with either dry sawdust, leather, or scrap cork. 13) Hot Rolled Finish - The finish obtained by rolling metal while hot resulting in a dark, oxidized and relatively rough surface. 14) Plain Pickled Finish - The finish obtained by immersion in sulfuric acid solution. This effectively removes most heavy scale and oxides on yellow brasses, but is less effective on other alloys and will not remove any thin surface films of deposited copper. The color is, therefore, usually duller than that of bright dipped or bichromate dipped material. 15) Planish Finish - A bright smooth finish usually obtained by rubbing metals together. 16) Satin Finish - See Scratch Brushed Finish. 17) Scratch Brushed Finish (Satin Finish) - The finish obtained by mechanically brushing the surface with wire bristle brushes or by buffing with greaseless compound.
Smooth edges produced on flat wire, strip, or bar, by drawing or rolling with or without previous slitting. The edge contours most commonly used are Square Corners, Rounded Corners, and Full Rounded Edges
A product with rectangular or square solid section and relatively great in length in proportion to thickness. 1) Drawn Flat Product - Flat product brought to final dimensions by drawing through a die, and furnished in flat straight lengths, on spools, or in rolls. The corners or edges may be square or of other contours. 2) Rolled Flat Product - Flat product brought to final thickness by rolling, and furnished in flat straight lengths, on spools, or in rolls. Longitudinal edges may be those resulting from final rolling to thickness or the product may be brought to final width by shearing, slitting, sawing, machining, or rolling. The corners or edges may be square or of other contours.
The degree to which a surface of a flat product approaches a plane. See Dish and Longitudinal Curl.
Deformation of the crystal structure revealed on a polished and etched section of a hot or cold formed piece which discloses the manner in which the metal is made to fill and follow a die contour.
1) In melting, a substance added to the melt to promote removal of foreign materials, and protect the surface. 2) In brazing or welding, a substance introduced to remove oxide and impurities.
A term often applied to a thin flat rolled section usually 0.005" or less in thickness.
The quality of an alloy which enables it to be cut in automatic machines at relatively high speeds yielding a short brittle chip.
See Finished Edges.
1) The instrument used to measure thickness or diameter. 2) Term sometimes used to designate thickness.
A number in a specific series used to designate a dimension. There are several series of such gauge numbers, of which the most familiar are the American Wire Gauge or Brown & Sharpe and Birmingham or Stubs.
A solid polyhedral (or many sided) crystal consisting of groups of atoms bound together in a regular geometric pattern. In mill practice grains are usually studied only as they appear in one plane.
The line of demarcation between grains.
The process by which individual grains coalesce to form larger and, therefore, fewer grains. This is usually brought about by annealing and results in the softening of the metal as well as changes in other properties.
The average diameter of grains, usually determined microscopically, of an etched plane surface of the metal. See ASTM E 112.
The resistance of metal to plastic deformation by indentation. The most common method of measurement is Rockwell. Other methods are Brinell, Scleroscope, Tukon, and Vickers.
The number used to designate the hardness of metal. The number is related to the scale of values of a particular hardness test, as Rockwell B 80 or Brinell 150.
Spontaneous failure of some metals by cracking under combined action of elevated temperature and stress (residual or applied). Fire cracking is a form of heat cracking resulting from residual stress and externally applied heat.
A combination of heating and cooling operations applied to a metal or alloy in the solid state to produce changes in physical and mechanical properties. Also see Age Hardening, Annealing and Quenching.
The process of changing the form or cross-section of a piece of metal at a temperature above its recrystallization temperature.
In oxygen-bearing copper, a condition of low ductility resulting from absorption of hydrogen at high temperature, internal reduction of cuprous oxide and creation of intergranular holes or cracks by the accompanying generation of steam.
Abbreviation for “International Annealed Copper Standard.”
Particles of foreign material (usually chips, dirt, carbon, oxides) that are held mechanically on or within the metal.
A copper or copper-alloy casting of small rectangular shape weighing about 20-35 lbs. for remelting.
Elements added in small amount to alloys to increase the resistance of the alloys to corrosion.
Fracture of metal that follows along the grain boundaries and between crystals or grains.
Terms used interchangeably to indicate a path along the grain boundaries and between the crystals or grains rather than through the grains.
See Stress, Residual.
A surface defect appearing as a seam, caused by folding over hot metal, fins, or sharp corners and then rolling or forging, but not welding, them into the surface.
1) Mill Lengths - Certain uniform lengths subject to established tolerances with short lengths included according to established schedule. 2) Multiple Lengths - Lengths of integral multiples of a base length, with suitable allowance for cutting if and as specified. Several different multiples of the base length may be included in any lot, at the mills' discretion. 3) Specified Lengths - Indicated uniform lengths, subject to established length tolerances; ie. 12'-0", 9'-7", or 0'-4 1/2" are specific lengths. 4) Specific Lengths with Ends - Indicated uniform lengths of 6' or over, subject to established length tolerances and with ends included according to established length schedules; ie. 10'-0" with ends or 6'-5" with ends. 5) Standard Lengths - Standard lengths are lengths which have been recommended in a Simplified Practice Recommendation or established as a Commercial Standard by the National Bureau of Standards, United States Department of Commerce as standards for certain products. 6) Stock Lengths - Normally certain uniform lengths subject to established tolerances (including Standard Lengths) actually carried in mill and warehouse stocks. The normal length actually carried will vary considerably with the product, alloy, size, mill source, and warehouse location. 7) Stock Lengths with Ends - In some products and sizes it is customary to include with stock lengths the end pieces resulting from cutting, according to established length schedules.
A unidirectional departure from longitudinal flatness.
The property of a meal that permits deformation by rolling, heading, hammering, or extension by pressure without fracturing.
See Dip Solution.
See Overhauling and Scalping.
A term applied to those copper alloys which because of a lack of hardness or abrasiveness present relatively little difficulty in maintaining standard dimensional tolerances.
The surface roughness resulting from working metal of large grain size. The surface is similar in texture to an orange peel.
The process of cutting away the surface layer from bars or plates after breakdown rolling. The object of this is to remove the minor surface casting defects and oxide.
A layer of interleaving paper is interspersed between layers of metal (either coils or cut sheets).
See Straightening and Flattening.
The physically distinct and homogeneous portion of matter in a heterogeneous system. In alloy systems, phases are usually identified by the Greek letters, alpha, beta, etc.
Punching holes in sheet or strip, or walls of shells.
1) A hole or defect remaining when a foreign particle embedded in the metal surface falls out. 2) A cavity resulting from localized corrosion or over-etching.
A flat rolled product over 3/16" (0.188") in thickness and over 12" in width.
1) The reduction of the diameter of ends of tubes, rod, or wire in order that they may be started through the drawing die. 2) The cutting of a taper point on wire to be made into wood screws and similar products.
The finishing of metal surfaces by a compound impregnated in the surfaces of a hard fabric faced wheel which rotates at high speed. Also see Buffing.
A general mill term applied to the size and condition of a product prior to the final drawing or rolling operation.
The change in grain structure which occurs when the metal is annealed, during which the deformed grains, strain hardened by working, become new unstrained grains.
The decrease of the area of the cross-section of a metal test specimen when fractured in tension testing. It is a criterion of ductility.
A device on which narrow strip is wound to.
A term applied to those copper alloys which, because of their hardness or abrasiveness require dimensional tolerances greater than those established for non-refractory alloys.
A slight transverse wave or shadow mark repeated at intervals, sometimes observed on flat products.
See Straightening and Flattening.
See Finished Edges
See Flat Products
The process of passing metal between rolls under pressure to reduce its thickness. 1) Cold Rolling - This process is carried out below the softening point of the metal and with copper alloys, usually at room temperature. 2) Hot Rolling - This process is carried out above the softening temperature and with copper alloys, usually at temperatures from about 1200F to 1700F, 650C to 927C.
See Finished Edges.
See Finished Edges.
See Tube Measurement Terms.
1) A heavy oxide coating on copper and copper alloys resulting from exposure to high temperatures in an oxidizing atmosphere. 2) A product resulting from the corrosion of metals.
The process of removing by means of rotating cutters or cutter heads the surface layer from bars or rods to eliminate minor surface casting defects and oxide. See Overhauling, Die Scalping, or Die Shaving.
Spontaneous failure of some metals by cracking under the combined action of corrosion and residual stresses. Season cracking can be prevented by relief annealing which removes entirely or reduces to a safe limit the residual stresses without affecting the temper and physical properties of the material. Also see Corrosion, Stress Corrosion.
The edges resulting from press shearing to final width and length. These edges are straighter than slit edges.
A flat rolled product up to and including 0.188" in thickness and over 20" in width.
A casting in the form of a bar used for rolling into strip.
The edges resulting from cutting to width by rotary slitters.
Joining metals by fusion of alloys that have relatively low melting points - mostly commonly, lead-base or tin-base alloys, which are the soft solders. Hard solders are alloys that have silver, copper, or nickel bases. Use of these alloys with melting points higher than 800F, 427C, is properly called "Brazing".
A defect which originates during casting and after rolling or drawing appears as a discontinuity either on the surface or as a faint streak, which on distortion becomes open or blistered.
A small reel. Also see Reel.
See Finished Edges.
See Resquared Metal.
1) Acid Stain - See Pickle Stain. 2) Air Stain - Superficial, uniform light-to-dark brown discoloration or dulling of the initial luster due to atmospheric attack. 3) Oil Stain - Localized brown or black discoloration on the surface of a product caused by incomplete removal or burning of lubricants. 4) Water Stain - Localized light-to-dark and often iridescent residue with sharply outlined darker border left from evaporation of water acquired from mill processing, transit or storage.
Any process applied to flat rolled products to eliminate any general or local curvature, either with respect to flatness or edgewise curvature. 1) Roll Flattening - The process of flattening a product by a machine with a number of small cylindrical rolls so positioned as to repeatedly flex the product and thus remove certain irregularities in shape. Roll flattening practically eliminates longitudinal curl, burr, and dish. It reduces edgewise curvature of narrow strip. This operation reduces buckles, but is relatively ineffective in eliminating wavy edges, ripples, and twist. Roll flattening is ordinarily applied to a Flat Rolled Product within the approximate range 0.010" to 0.125" thick and in widths to about 48", and is particularly effective on annealed tempers, but is progressively less effective with increase in degree of rolled temper. 2) Stretcher Straightening, (Patent Leveling) - Applicable to Flat Straight Lengths. A process which simultaneously flattens and straightens a product by longitudinally stretching it beyond its elastic limit. This process practically removes buckles, ripples, wavy edges, twist, and edgewise curvature, is partially effective in removing longitudinal curl but is ineffective in removal of crown, dish, and burr. It is commonly applied to flat rolled products within the approximate size range of 3" to 48" wide and 0.012" to 0.050" thick. It is particularly effective on all annealed tempers and on rolled tempers up to Half Hard.
1) Applied Stress - Stresses that are set up and exist in a body during application of an external load. 2) Residual Stress - Stresses that remain within a body as the result of plastic deformation, casting, or rapid temperature change.
A flat product, other than Flat Wire, up to and including 0.188" in thickness and generally furnished as follows: 1) With slit, sheared, or slit and edge rolled edges in widths up to 20" inclusive. 2) With finished drawn or rolled edges in widths over 1-1/4" to 12 inclusive.
Elements other than those listed.
The condition produced in a metal by mechanical or thermal treatment and having characteristic structure and mechanical properties. 1) Annealed Tempers - Tempers produced by annealing and usually defined by a nominal grain size or grain size range. The most commonly specified nominal annealed tempers are as follows: 0.015mm 0.050mm 0.025mm 0.070mm 0.035mm 0.100mm Certain alloys not composed entirely of alpha grains do not lend them-selves to classification under the above listed tempers. The terms "Light Anneal" and "Soft Anneal" are also commonly used. Their mechanical properties are defined by applicable specifications. 2) Annealed to Temper - Metal annealed to a tensile strength or Rockwell specification approximately equal to that specification normally met by rolling to temper. This temper provides greater ductility and better finish at same tensile strength. Not available in all alloys and restricted to Half Hard temper or softer. Metal need not be fully recrystallized. 3) Rolled Tempers - a) For flat products, these tempers are designated by the following terms and defined in applicable specifications: Eighth Hard Quarter Hard Half Hard Hard Extra Hard Three Quarter Hard Spring Extra Spring Ultra Spring Super Spring b) For tube, the temper designations commonly used are Light Drawn, Drawn (general purpose) and Hard Drawn, and are defined in applicable specifications. i) Light Drawn Temper - Generally applied to tube where some degree of stiffness is desired without serious impairment of bending qualities. ii) Drawn (General Purpose) Temper - Applicable to tube only, commonly used where there is no real requirement for high strength or hardness on the one hand or for bending qualities on the other. iii) Hard Drawn Temper - Used only where there is need for a tube as hard or as strong as is commercially feasible for the size in question.
The value obtained by dividing the maximum load observed during tensile straining by the specimen cross-sectional area before straining. Also called "Ultimate Strength". It is usually expressed in pounds per square inch.
1) Bend - A test sometimes made to indicate ductility or bending quality by bending a suitable specimen about a predetermined radius through a predetermined angle. 2) Brinell Hardness - A test made to determine hardness on relatively thick sections of metal by pressing a steel ball of specified diameter into a test specimen under a specified load. This test is seldom used on copper and copper-base alloys. See ASTM E 10. 3) Creep - A test to determine the extension of metallic materials due to the combined effects of temperature, tensile stress, and time. Inherently, it is a long term test not suitable for specification purposes. See ASTM E 22. 4) Cup - A test to indicate the ductility of sheet or strip wherein a cup is drawn from the metal until it fractures. Several modifications of the original Erichsen method are now in use. See ASTM A 344. 5) Endurance - A test to determine the endurance limit of a metal's resistance to fatigue by subjecting a specimen to repeated alternating or pulsating stresses. 6) Expansion (Pin) - A test used to determine the capacity of the tube for expansion and to reveal surface defects by pushing a tapered pin into the open end of a specimen. See ASTM B 153. 7) Flattening - A test made on annealed tube to indicate ductility and freedom from mechanical defects. 8) Hydrostatic - A test to prove soundness and resistance to leakage of tube and pipe under internal water pressure. 9) Impact - A test made to determine the resistance of metals to failure by sudden shock load. See ASTM E 23. 10) Mercurous Nitrate - An accelerated test to indicate the resistance of copper-base alloy products to season cracking. See ASTM B 154. 11) Pneumatic - A test used to prove resistance to leakage of tube or pipe by the application of internal air pressure to the product while submerged in water. 12) Rockwell Hardness - A test to measure hardness by determining the depth of penetration into a specimen of a penetrator under predetermined conditions of test. See ASTM E 18. 13) Tension - A test to determine one or more of the following: tensile strength, yield strength, elongation, and contraction of area. See ASTM E 8. 14) Torsion - A test to determine the strength in torsion by measuring the torque required to twist a specimen of given length through a predetermined angle.
The amount by which any characteristic, such as dimensional, chemical, physical, or mechanical properties, may vary from that specified.
A term usually applied to a type of crack that passes through the grains as opposed to one that follows the grain boundaries.
Fracture of metal through the grain or crystals as distinguished from intercrystalline cracking.
1) Concentricity - Concentricity implies coincidence of the centers of the OD and ID. However, since a relative displacement (eccentricity) of the centers is difficult to measure directly, while the resulting variation in wall thickness is relatively easy to measure, concentricity and eccentricity are preferably expressed in terms of the latter. 2) Diameter - Average Inside - For all practical purposes, the average ID is the average, at only one cross-section, of the maximum and minimum measured diameters. 3) Diameter - Average Outside - The average OD is the average, at any one cross-section, of the maximum and minimum measured diameters. 4) Diameter - At Any Point - Inside - Inside diameter may be measured at any point around the periphery. Such individual measurements may depart from the nominal due either to the tube being larger than nominal, smaller than nominal, out-of-round, or a possible combination of these. 5) Diameter - At Any Point - Outside - Outside diameter may be measured at any point around the periphery. Such individual measurements may depart from the nominal due either to the tube being larger than nominal, smaller than nominal, out-of-round, or a possible combination of these. 6) Roundness - Roundness implies a truly circular periphery of the inside or the outside surface. The deviation from roundness is measured as the difference between major and minor diameters as determined at any one cross-section of the tube. 7) Wall Thickness - At Any Point - Wall thickness may be measured at any point around the periphery. Such individual measurements may depart from the nominal due to the wall being either thicker than nominal or thinner than nominal, or to the tube being eccentric, or a possible combination of these. 8) Wall Thickness - Average - For all practical purposes, the average wall thickness is the average at any one cross-section, of the maximum and minimum wall thickness.
See Condenser Tube Plate.
A series or system of tubes, collectively. This term is not recommended to designate an individual tube or type of tube.
A winding departure from flatness.
Abbreviation for “Traverse Wound Reels.” Metal supplied on reels in traverse wound condition.
See Tensile Strength.
See Tube Measurement Terms.
See Tube Measurement Terms.
See Tube, Copper Water Tube
A wrinkled condition along the edges of the product, with a relatively flat center portion.
Process of producing localized coalescence of metal by heating to suitable temperatures, with or without the application of pressure, and with or without the use of filler metal. The filler metal either has a melting point approximately the same as the base metals or has a melting point below that of the base metals, but above 800F. Common welding processes are: Oxyacetylene Welding Gas Shielded Arc Welding Resistance Welding (Spot, Seam, Butt) Coated Metal Arc Welding Carbon Arc Welding
Filler metal, in wire or rod form, used in gas welding and brazing processes, and those arc-welding processes wherein the electrode does not furnish the filler metal.
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