1、Designation: A787/A787M 15aStandard 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 rev
2、ision, 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), 55 % aluminum-zinc alloy-coated, orzinc-aluminum-magnesium alloy-coated steel sheet. Tubing foruse as electrical conduit (EMT) or interme
4、diate metallicconduit (IMC) is not covered by this specification.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 list
5、ed above may be orderedprovided all other 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 val
6、ues stated in either SIunits or inch-pound 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 s
7、ystems may result in non-conformance with 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
8、ProcessA792/A792M Specification for Steel Sheet, 55 %Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA924/A924M Specification for General Requirements forSteel Sheet, Metallic-Coated by the Hot-Dip ProcessA1046/A1046M Specification for Steel Sheet, Zinc-Aluminum-Magnesium Alloy-Coated by the Hot-Di
9、p Pro-cessB6 Specification for Zinc3. Classification3.1 The types of tubing covered by this specification are:TypeNumberCodeLettersDescription1 AWAC electric-resistance-welded aluminum-coated carbon steel mechanical tubing2 AWG electric-resistance-welded galvanizedcarbon steel mechanical tubing3 AWP
10、G electric-resistance-welded carbon steelmechanical tubing, post-hot dippedgalvanized4 AWGA electric-resistance-welded carbon steelmechanical tubing, zinc-iron alloy-coated (galvannealed)5 AWGZ electric-resistance-welded carbon steelmechanical tubing, 55 % aluminum-zincalloy-coated6 AWZAM electric-r
11、esistance-welded carbon steelmechanical tubing, zinc-aluminum-magnesium alloy-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 this specification shall in-clude the following:4.2.1 Qua
12、ntity (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 rawmaterial,4.2.6 Oiled or dry (Section 16),4.2.7 Extra
13、 smooth coating (if required),4.2.8 Customer application, including fabrication,4.2.9 Flash condition (7.1),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 P
14、roducts.Current edition approved Sept. 1, 2015. Published September 2015. Originallyapproved in 1981. Last previous edition approved in 2015 as A787/A787M 15.DOI: 10.1520/A0787_A0787M-15A.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service
15、astm.org. For Annual Book of ASTMStandards volume information, refer to the standards 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 S
16、tates14.2.10 Steel grade designation (Sections 5 and 9),4.2.11 Report of chemical analysis if required (Sections 10and 11),4.2.12 Shape (round, square, rectangular, or special),4.2.12.1 Dimensions: roundany two of the following:inside diameter, outside diameter, or wall thickness; square orrectangul
17、aroutside 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 Squareness of cut: round tubing, if required
18、(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 (Section 18), and4.2.20 Recoating of outside diam
19、eter 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 may incorporate separate degas-sing or refining
20、 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 strand cast.When steel of different grades is sequ
21、entially 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, thecomposition of the coating shall comply with t
22、he 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 % aluminum-zinc alloy-coated steel sheet.5.2.4 Sp
23、ecification A1046/A1046MCoating designationfor zinc-aluminum-magnesium alloy-coated steel sheet.5.2.5 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 sh
24、eet shall meet the requirements ofSpecification A463/A463M, A653/A653M, A792/A792M,A924/A924M, and A1046/A1046M except for the chemicalrequirements.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
25、 3.6.1.1 The weld shall not be located within the radius of thecorners 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
26、3. Wallthickness tolerances shall be determined by agreement betweenthe 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 t
27、o this specification may have the followingconditions of welding flash 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
28、the height of the remaining welding flash iscontrolled so as not to exceed 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 controlle
29、d to 0.005 in. 0.13mm maximum in tubing produced to outside diameter andwall thickness, inside diameter and wall thickness, or outsideTABLE 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
30、0.035MT1015 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 ch
31、emical 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
32、 indicate 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
33、.035 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
34、 practice as shown in Table 7.A787/A787M 15a2TABLE3WallThicknessToleranceforPremetallicCoatedAs-WeldedTubingA(inch-poundunits)OutsideDiameter,in.WallThickness12to1,inclOver1to11516,inclOver11516to334,inclOver334to412,inclOver412to6,inclOver6to8,inclOver8to10,inclOver10to12,inclOver12to15,inclWallThi
35、cknessTolerance,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.
36、0020.0100.0020.010140.0830.0060.0080.0060.0080.0050.0090.0050.0090.0040.0100.0040.0100.0030.0110.0030.0110.0030.011130.0950.0080.0100.0080.0100.0070.0110.0070.0110.0060.0120.0060.0120.0040.0140.0040.0140.0040.014120.1090.0080.0100.0080.0100.0070.0110.0070.0110.0060.0120.0060.0120.0040.0140.0040.0140
37、.0040.014110.1200.0090.0110.0090.0110.0080.0120.0080.0120.0070.0130.0070.0130.0040.0160.0040.0160.0040.016100.1340.0090.0110.0090.0110.0080.0120.0080.0120.0070.0130.0070.0130.0040.0160.0040.0160.0040.01690.1480.0090.0120.0080.0120.0080.0120.0070.0130.0070.0130.0060.0140.0060.0140.0060.01480.1650.009
38、0.0120.0080.0120.0080.0120.0070.0130.0070.0130.0060.0140.0060.0140.0060.01470.1800.0090.0120.0080.0120.0080.0120.0070.0130.0070.0130.0060.0140.0060.0140.0060.01APost-hotdippedgalvanizedweldedtubingwallthicknesstolerancesshallbedeterminedbyagreementbetweentheproducerandpurchaser(6.2).BBirminghamWireG
39、auge.A787/A787M 15a3TABLE4WallThicknessToleranceforPremetallicCoatedAs-WeldedTubingA(SIUnits)OutsideDiameter,mmWallThickness13to25,inclOver25to50,inclOver50to100,inclOver100to150,inclOver150to200,inclOver200to250,inclOver250to375,inclWallThicknessTolerance,mm,PlusandMinusmmPlusMinusPlusMinusPlusMinu
40、sPlusMinusPlusMinusPlusMinusPlusMinus1.00.040.080.080.200.080.201.50.100.180.100.150.080.230.050.250.050.250.050.252.00.150.200.150.200.130.230.100.250.100.250.100.250.080.282.50.200.250.200.250.180.280.150.300.150.300.100.300.100.353.00.220.270.230.280.200.300.180.330.180.330.100.400.100.403.50.230
41、.280.230.280.200.300.180.330.180.330.100.400.100.404.00.230.300.200.300.180.330.180.330.150.400.150.404.50.230.300.200.300.180.330.180.330.150.400.150.40APost-hotdippedgalvanizedweldedtubingwallthicknesstolerancesshallbedeterminedbyagreementbetweentheproducerandpurchaser(6.2).A787/A787M 15a4diameter
42、 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 be furnished in the following shapes, asspecified by the purchaser: roun
43、d, square, rectangular, orspecial shapes (as negotiated).7.3 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 f
44、or specificapplications shall be provided in 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
45、,may be ordered in any of the grades shown in Table 1 or Table2.TABLE 5 Diameter Tolerances for Metallic-CoatedRound Tubing (inch-pound units)Outside DiameterRangeF,in.Wall ThicknessTubing withAny Inside FlashConditionFlash-Controlledto 0.005 in.Tubing OnlyABWGBin.OutsideC,DDiameter,Plus andMinusIns
46、ide 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 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
47、 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 100.035/0.0830.095/0.1340.0090.0090.0260.032Over 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, inclOve
48、r 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 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 0.065/0.13
49、4 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 12 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 diameter tolerances, in which the height of the r
