1、Designation: A787/A787M 14Standard Specification forElectric-Resistance-Welded Metallic-Coated Carbon SteelMechanical Tubing1This standard is issued under the fixed designation A787/A787M; the number immediately following the designation indicates the yearof original adoption or, in the case of revi
2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers round, square, rectangular, andspecial shape, electric-resistance-welded
3、mechanical tubing,either zinc-coated (galvanized) after welding or produced fromaluminum-coated, zinc-coated (galvanized), zinc-iron alloy-coated (galvannealed), or 55 % aluminum-zinc alloy-coatedsteel sheet. Tubing for use as electrical conduit (EMT) orintermediate metallic conduit (IMC) is not cov
4、ered by thisspecification.1.2 This specification covers mechanical tubing with out-side diameters or maximum outside dimensions ranging from12 to 15 in. 12.7 to 380.0 mm and wall thickness from 0.028to 0.180 in. 0.70 to 4.60 mm.1.3 Sizes outside the ranges listed above may be orderedprovided all oth
5、er requirements of the specification are met.1.4 This specification is expressed in both inch-pound unitsand in SI units; however, unless the purchase order specifiesthe applicable M specification designation (SI units), theinch-pound units shall apply. The values stated in either SIunits or inch-po
6、und units are to be regarded separately asstandard. Within the text, the SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore, each system shall be used independently of the other.Combining values from the two systems may result in non-conformance wi
7、th the standard.2. Referenced Documents2.1 ASTM Standards:2A463/A463M Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip ProcessA653/A653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA792/A792M Specification for Ste
8、el Sheet, 55 %Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA924/A924M Specification for General Requirements forSteel Sheet, Metallic-Coated by the Hot-Dip ProcessB6 Specification for Zinc3. Classification3.1 The types of tubing covered by this specification are:TypeNumberCodeLettersDescription1
9、 AWAC electric-resistance-welded aluminum-coated carbon steel mechanical tubing2 AWG electric-resistance-welded galvanizedcarbon steel mechanical tubing3 AWPG electric-resistance-welded carbon steelmechanical tubing, post-hot dippedgalvanized4 AWGA electric-resistance-welded carbon steelmechanical t
10、ubing, zinc-iron alloy-coated (galvannealed)5 AWGZ electric-resistance-welded carbon steelmechanical tubing, 55 % aluminum-zincalloy-coated4. Ordering Information4.1 The ordered wall thickness of the tubing shall be thetotal of the base metal and the metallic coating.4.2 Orders for material under th
11、is specification shall in-clude the following:4.2.1 Quantity (feet, metres, or number of lengths),4.2.2 Type, code letters, and description (Sections 1 and 3),4.2.3 Applicable ASTM designation number(s),4.2.4 Coating designation and type of coating,4.2.5 Chemically treated or not chemically treated
12、rawmaterial,4.2.6 Oiled or dry (Section 16),4.2.7 Extra smooth coating (if required),4.2.8 Customer application, including fabrication,4.2.9 Flash condition (7.1),4.2.10 Steel grade designation (Sections 5 and 9),4.2.11 Report of chemical analysis if required (Sections 10and 11),4.2.12 Shape (round,
13、 square, rectangular, or special),1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved May 1, 2014. Published May 2014. Original
14、lyapproved in 1981. Last previous edition approved in 2009 as A787/A787M 09.DOI: 10.1520/A0787_A0787M-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standar
15、ds Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.2.12.1 Dimensions: roundany two of the following:inside diameter, outside d
16、iameter, or wall thickness; square orrectangularoutside dimension, wall thickness, and cornerradii, if required. (See 12.1 and 13.1 and 13.2.)4.2.13 Length: round tubingmill lengths or definite cutlengths (see 12.2); square and rectangular tubingmill cutlengths and specified length (see 13.4).4.2.14
17、 Squareness of cut: round tubing, if required (see12.3); square and rectangular tubing, if required (see 13.7),4.2.15 Burrs removed, if required (see 15.2),4.2.16 Special packaging (Section 19),4.2.17 Customer specification number, if applicable,4.2.18 Special requirements,4.2.19 Special marking (Se
18、ction 18), and4.2.20 Recoating of outside diameter weld and heat-affected area, on precoated steel, if required.5. Process5.1 The steel shall be made from any process.5.1.1 If a specific type of melting is required by thepurchaser, it shall be stated on the purchase order.5.1.2 The primary melting m
19、ay incorporate separate degas-sing or refining and may be followed by secondary melting,using electroslag remelting or vacuum remelting. If secondarymelting is employed, the heat shall be defined as all of theingots remelted from a single primary heat.5.1.3 Steel may be cast in ingots or may be stra
20、nd cast.When steel of different grades is sequentially strand cast,identification of the resultant transition material is required.The producer shall remove the transition material by anestablished procedure that positively separates the grades.5.2 For tubing produced from precoated steel sheet, the
21、composition of the coating shall comply with the applicablespecification.5.2.1 Specification A463/A463MCoating designation foraluminum coated-sheet.5.2.2 Specification A653/A653MCoating designation forgalvanized and galvannealed steel sheet.5.2.3 Specification A792/A792MCoating designation for55 % a
22、luminum-zinc alloy-coated steel sheet.5.2.4 Other grades of coated steel sheet, as listed in Table 1and Table 2, may be used as the precoated material for the steeltubing upon agreement between the manufacturer and thepurchaser. Such steel sheet shall meet the requirements ofSpecification A463/A463M
23、, A653/A653M, A792/A792M, andA924/A924M, except for the chemical requirements.6. Manufacture6.1 Tubes shall be made by the electric-resistance weldingprocess and shall be made from hot or cold-rolled precoatedsteel except for Type 3.6.1.1 The weld shall not be located within the radius of thecorners
24、 of any shaped tube unless specified by the purchaser.6.2 Special manufacturing practices allow for post-hotdipped galvanizing of welded tubing. If this product is desiredall sections of this specification will apply except Table 3. Wallthickness tolerances shall be determined by agreement betweenth
25、e producer and purchaser.7. Flash Conditions7.1 The flash conditions under which tubing may befurnished are as follows: The flash shall be removed from theoutside diameter of tubing covered by this specification.Tubing furnished to this specification may have the followingconditions of welding flash
26、 on the inside diameter.7.1.1 Flash-InAll tubing in which the inside diameterwelding flash does not exceed the wall thickness or332 in.2.38 mm, whichever is less.7.1.2 Flash Controlled to 0.010 in. 0.25 mm, MaximumTubing in which the height of the remaining welding flash iscontrolled so as not to ex
27、ceed 0.010 in. 0.25 mm. Thiscondition is available in over 0.750 in. 19.0 mm outsidediameter and gauges consistent with Tables 5 and 6.7.1.3 Flash Controlled to 0.005 in. 0.13 mm, MaximumWhen the inside diameter flash is controlled to 0.005 in. 0.13mm maximum in tubing produced to outside diameter a
28、ndwall thickness, inside diameter and wall thickness, or outsidediameter and inside diameter tolerances, the remaining insidediameter flash, if any, is part of the applicable inside diametertolerance. This controlled flash is available in 0.750 in. 19.0mm outside diameter or greater.7.2 Tubes shall
29、be furnished in the following shapes, asspecified by the purchaser: round, square, rectangular, orspecial shapes (as negotiated).TABLE 1 Chemical Requirements for Low-Carbon SteelsA ,BGradeDesignationCComposition, %Carbon ManganesePhos-phorus,maxSulfur,maxMT1010 0.05 to 0.15 0.30 to 0.60 0.035 0.035
30、MT1015 0.10 to 0.20 0.30 to 0.60 0.035 0.035MTX1015 0.10 to 0.20 0.60 to 0.90 0.035 0.035MT1020 0.15 to 0.25 0.30 to 0.60 0.035 0.035MTX1020 0.15 to 0.25 0.70 to 1.00 0.035 0.035ARimmed or capped steels that may be used for the above grades are charac-terized by a lack of uniformity in their chemica
31、l composition, and for this reasonproduct analysis is not technologically appropriate unless misapplication is clearlyindicated.BChemistry represents heat analysis. Product analysis, except for rimmed orcapped steel, is to be in accordance with usual practice as shown in Table 7.CThe letters MT indi
32、cate mechanical tubing.TABLE 2 Chemical Requirements for Other Carbon SteelsAGradeDesigna-tionComposition, %Carbon ManganesePhos-phorus,maxSulfur,max1008 0.10 max 0.50 0.035 0.0351010 0.08 to 0.13 0.30 to 0.60 0.035 0.0351015 0.12 to 0.18 0.30 to 0.60 0.035 0.0351016 0.12 to 0.19 0.60 to 0.90 0.035
33、0.0351017 0.14 to 0.21 0.30 to 0.60 0.035 0.0351018 0.14 to 0.21 0.60 to 0.90 0.035 0.0351019 0.14 to 0.21 0.70 to 1.00 0.035 0.0351021 0.17 to 0.24 0.60 to 0.90 0.035 0.035AChemistry represents heat analysis. Product analysis, except for rimmed orcapped steel, is to be in accordance with usual prac
34、tice as shown in Table 7.A787/A787M 142TABLE3WallThicknessToleranceforPremetallicCoatedAs-WeldedTubingA(inch-poundunits)OutsideDiameter,in.WallThickness12to1,inclOver1to11516,inclOver11516to334,inclOver334to412,inclOver412to6,inclOver6to8,inclOver8to10,inclOver10to12,inclOver12to15,inclWallThickness
35、Tolerance,in.,PlusandMinusBWGBin.PlusMinusPlusMinusPlusMinusPlusMinusPlusMinusPlusMinusPlusMinusPlusMinusPlusMinus220.0280.0020.0060.0020.006200.0350.0030.0060.0020.0060.0020.006180.0490.0040.0070.0030.0080.0030.008160.0650.0050.0070.0040.0080.0030.0090.0030.0090.0020.0100.0020.0100.0020.0100.0020.0
36、100.0020.010140.0830.0060.0080.0060.0080.0050.0090.0050.0090.0040.0100.0040.0100.0030.0110.0030.0110.0030.011130.0950.0080.0100.0080.0100.0070.0110.0070.0110.0060.0120.0060.0120.0040.0140.0040.0140.0040.014120.1090.0080.0100.0080.0100.0070.0110.0070.0110.0060.0120.0060.0120.0040.0140.0040.0140.0040.
37、014110.1200.0090.0110.0090.0110.0080.0120.0080.0120.0070.0130.0070.0130.0040.0160.0040.0160.0040.016100.1340.0090.0110.0090.0110.0080.0120.0080.0120.0070.0130.0070.0130.0040.0160.0040.0160.0040.01690.1480.0090.0120.0080.0120.0080.0120.0070.0130.0070.0130.0060.0140.0060.0140.0060.01480.1650.0090.0120
38、.0080.0120.0080.0120.0070.0130.0070.0130.0060.0140.0060.0140.0060.01470.1800.0090.0120.0080.0120.0080.0120.0070.0130.0070.0130.0060.0140.0060.0140.0060.01APost-hotdippedgalvanizedweldedtubingwallthicknesstolerancesshallbedeterminedbyagreementbetweentheproducerandpurchaser(6.2).BBirminghamWireGauge.A
39、787/A787M 1437.3 Recoating of the outside diameter weld-heat-affectedarea on precoated steel tubing may be performed at themanufactures option, if not specifically requested by thepurchaser.8. Surface Finish8.1 Special surface finishes as may be required for specificapplications shall be provided in
40、 the purchase order byagreement between the producer and purchaser.9. Base Metal Chemical Composition9.1 The chemical composition of the sheet steel base metalshall conform to the requirements of Table 1.9.2 Copper-bearing steel, with 0.20 % minimum copper,may be ordered in any of the grades shown i
41、n Table 1 or Table2.9.3 An analysis of each heat of steel shall be made by thebasic steel producer to determine the percentage of the ele-ments specified. The heat analysis, as supplied by the steelmelter, shall conform to the requirements of Table 1 or Table 2.9.4 When a grade is ordered under this
42、 specification,supplying an alloy grade that specifically requires the additionof any element other than those listed for the ordered grade inTable 1 and Table 2 is not permitted.TABLE 5 Diameter Tolerances for Metallic-CoatedRound Tubing (inch-pound units)Outside DiameterRangeF,in.Wall ThicknessTub
43、ing withAny Inside FlashConditionFlash-Controlledto 0.005 in.Tubing OnlyABWGBin.OutsideC,DDiameter,Plus andMinusInside Diameter,Plus and MinusTolerances, in.E12 to 118, incl 22 to 16 0.028/0.065 0.0035 0.019Over 118 to 2, incl 22 to 14 0.028/0.083 0.005 0.021Over 118 to 2, incl 13 to 10 0.095/0.134
44、0.005 0.027Over 2 to 212, inclOver 2 to 212, incl20 to 1413 to 100.035/0.0830.095/0.1340.0060.0060.0230.029Over 212 to 3, inclOver 212 to 3, incl20 to 1413 to 100.035/0.0830.095/0.1340.0080.0080.0250.031Over 3 to 312, inclOver 3 to 312, incl20 to 1413 to 100.035/0.0830.095/0.1340.0090.0090.0260.032O
45、ver 312 to 4, inclOver 312 to 4, incl20 to 1413 to 100.035/0.0830.095/0.1340.0100.0100.0270.033Over 4 to 5, inclOver 4 to 5, incl16 to 1413 to 100.065/0.0830.095/0.1340.0200.0200.0370.043Over 5 to 6, inclOver 5 to 6, incl16 to 1413 to 100.065/0.0830.095/0.1340.0200.0200.0370.043Over 6 to 8, incl 16
46、to 10 0.065/0.134 0.025 0.048Over 6 to 8, incl 9 to 7 0.148/0.180 0.025 0.059Over 8 to 10, incl 16 to 10 0.065/0.134 0.030 0.043Over 8 to 10, incl 9 to 7 0.148/0.180 0.030 0.059Over 10 to 12, incl 16 to 10 0.065/0.134 0.035 0.041Over 10 to 12, incl 9 to 7 0.148/0.180 0.035 0.045Over 12 to 15, incl 1
47、2 to 10 0.109/0.134 0.040 0.058Over 12 to 15, incl 9 to 7 0.148/0.180 0.040 0.060AFlash controlled to 0.005 in. maximum tubing is produced to outside diameter tolerances and wall thickness tolerances, inside diameter tolerances and wall thicknesstolerances, or outside diameter tolerances and inside
48、diameter tolerances, in which the height of the remaining inside welding flash is controlled not to exceed 0.005 in.Any remaining flash is considered to be part of the applicable inside diameter tolerances.BBirmingham Wire Gauge.CFlash-in tubing is produced to outside diameter tolerances and wall th
49、ickness tolerances only, and the height of the inside welding flash does not exceed the wallthickness or332 in., whichever is less.DFlash controlled to 0.010 in. maximum tubing consists of tubing over58 in. outside diameter which is commonly produced to outside diameter tolerances and wallthickness tolerances only, in which the height of the remaining inside welding flash is controlled not to exceed 0.010 in.EThe ovality shall be within the above tolerances except when the wall thickness is less than 3 % of the outside diameter,
