1、Designation: A787/A787M 09Standard 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 galvanized car-bon steel mechanical tubing3 AWPG electric-resistance-welded carbon steelmechanical tubing, post-hot dipped gal-vanized4 AWGA electric-resistance-welded carbon steelmechanic
10、al tubing, 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 unde
11、r this 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 trea
12、ted 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),1This specificat
13、ion 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 Oct. 1, 2009. Published November 2009. Originallyapproved in 1981. Last previous edition ap
14、proved in 2005 as A787 05. DOI:10.1520/A0787_A0787M-09.2For 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 standards Document Summary page onthe ASTM website.1*A Su
15、mmary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2.12 Shape (round, square, rectangular, or special),4.2.12.1 Dimensions: roundany two of the following:inside diameter, out
16、side diameter, 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).
17、4.2.14 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 marki
18、ng (Section 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 mel
19、ting may 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 b
20、e strand 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 shee
21、t, thecomposition 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 for
22、55 % aluminum-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
23、/A463M, 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.6.2 Special manufacturing practices allow for post-hotdipped galvanizing of wel
24、ded tubing. If this product is desiredall sections of this specification will apply except Tables 3 and4. Wall thickness tolerances shall be determined by agreementbetween the producer and purchaser.7. Flash Conditions7.1 The flash conditions under which tubing may befurnished are as follows: The fl
25、ash shall be removed from theoutside diameter of tubing covered by this specification.Tubing furnished to this specification may have the followingconditions of welding flash on the inside diameter.7.1.1 Flash-In All tubing in which the inside diameterwelding flash does not exceed the wall thickness
26、 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 exceed 0.010 in. 0.25 mm. Thiscondition is available in over 0.750 in. 19.0 mm outsidediameter and gages consistent with Tables
27、 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 andwall thickness, inside diameter and wall thickness, or outsidediameter and inside diameter tolerances, the remaining insided
28、iameter 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: round, square, rectangular, orspecial shapes (as negotiate
29、d).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.TABLE 1 Chemical Requirements for Low-Carbon SteelsA,BGradeDesignationCComposition, %Carbon ManganesePhos-phorus,maxSulf
30、ur,maxMT1010 0.05 to 0.15 0.30 to 0.60 0.035 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 arecharac
31、terized by a lack of uniformity in their chemical composition, and for thisreason product analysis is not technologically appropriate unless misapplication isclearly indicated.BChemistry represents heat analysis. Product analysis, except for rimmed orcapped steel, is to be in accordance with usual p
32、ractice as shown in Table 7.CThe letters MT 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
33、0.035 0.0351016 0.12 to 0.19 0.60 to 0.90 0.035 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 orcapp
34、ed steel, is to be in accordance with usual practice as shown in Table 7.A787/A787M 092TABLE 3 Wall Thickness Tolerance for Premetallic Coated As-Welded TubingA(inch-pound units)Outside Diameter, in.Wall Thickness12 to 1, inclOver 1 to11516 , inclOver 11516 to334 , inclOver 334 to412 , inclOver 412
35、to6, inclOver 6 to8, inclOver 8 to10, inclOver 10 to12, inclOver 12 to15, inclWall Thickness Tolerance, in., Plus and MinusBWGBin. Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus22 0.028 0.002 0.006 0.002 0.00620 0.035 0.003 0.006 0.002 0.006 0.002
36、0.00618 0.049 0.004 0.007 0.003 0.008 0.003 0.00816 0.065 0.005 0.007 0.004 0.008 0.003 0.009 0.003 0.009 0.002 0.010 0.002 0.010 0.002 0.010 0.002 0.010 0.002 0.01014 0.083 0.006 0.008 0.006 0.008 0.005 0.009 0.005 0.009 0.004 0.010 0.004 0.010 0.003 0.011 0.003 0.011 0.003 0.01113 0.095 0.008 0.01
37、0 0.008 0.010 0.007 0.011 0.007 0.011 0.006 0.012 0.006 0.012 0.004 0.014 0.004 0.014 0.004 0.01412 0.109 0.008 0.010 0.008 0.010 0.007 0.011 0.007 0.011 0.006 0.012 0.006 0.012 0.004 0.014 0.004 0.014 0.004 0.01411 0.120 0.009 0.011 0.009 0.011 0.008 0.012 0.008 0.012 0.007 0.013 0.007 0.013 0.004
38、0.016 0.004 0.016 0.004 0.01610 0.134 0.009 0.011 0.009 0.011 0.008 0.012 0.008 0.012 0.007 0.013 0.007 0.013 0.004 0.016 0.004 0.016 0.004 0.0169 0.148 0.009 0.012 0.008 0.012 0.008 0.012 0.007 0.013 0.007 0.013 0.006 0.014 0.006 0.014 0.006 0.0148 0.165 0.009 0.012 0.008 0.012 0.008 0.012 0.007 0.
39、013 0.007 0.013 0.006 0.014 0.006 0.014 0.006 0.0147 0.180 0.009 0.012 0.008 0.012 0.008 0.012 0.007 0.013 0.007 0.013 0.006 0.014 0.006 0.014 0.006 0.01APost-hot dipped galvanized welded tubing wall thickness tolerances shall be determined by agreement between the producer and purchaser (6.2).BBirm
40、ingham Wire Gage.A787/A787M093TABLE 4 Wall Thickness Tolerance for Premetallic Coated As-Welded TubingA(SI Units)Outside Diameter, mmWall Thickness 13 to 25, incl Over 25 to 50, incl Over 50 to 100, incl Over 100 to 150, incl Over 150 to 200, incl Over 200 to 250, incl Over 250 to 375, inclWall Thic
41、kness Tolerance, mm, Plus and Minusmm Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus1.0 0.04 0.08 0.08 0.20 0.08 0.201.5 0.10 0.18 0.10 0.15 0.08 0.23 0.05 0.25 0.05 0.25 0.05 0.252.0 0.15 0.20 0.15 0.20 0.13 0.23 0.10 0.25 0.10 0.25 0.10 0.25 0.08 0.282.5 0.20 0.25 0.2
42、0 0.25 0.18 0.28 0.15 0.30 0.15 0.30 0.10 0.30 0.10 0.353.0 0.22 0.27 0.23 0.28 0.20 0.30 0.18 0.33 0.18 0.33 0.10 0.40 0.10 0.403.5 0.23 0.28 0.23 0.28 0.20 0.30 0.18 0.33 0.18 0.33 0.10 0.40 0.10 0.404.0 0.23 0.30 0.20 0.30 0.18 0.33 0.18 0.33 0.15 0.40 0.15 0.404.5 0.23 0.30 0.20 0.30 0.18 0.33 0
43、.18 0.33 0.15 0.40 0.15 0.40APost-hot dipped galvanized welded tubing wall thickness tolerances shall be determined by agreement between the producer and purchaser (6.2).A787/A787M0948. Surface Finish8.1 Special surface finishes as may be required for specificapplications shall be provided in the pu
44、rchase 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 in Table
45、 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 specif
46、ication,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.10. Coating Bath Chemical Composition10.1 When tubing is produced from precoated sheet steel,the tubing manufacturer shall furni
47、sh, upon request, a reportstating that the tubing has been manufactured from precoatedsheet steel meeting one of the following specifications: A463/A463M, A653/A653M, A792/A792M, and A924/A924M.10.2 For post-coated tubing the zinc used for coating shallbe any grade of zinc conforming to Specificatio
48、n B6.11. Product Analysis11.1 When requested on the purchase order, a productanalysis shall be made by the supplier. The number and sourceof samples for a product analysis shall be based on theindividual heat or lot identity of one of the following forms:TABLE 5 Diameter Tolerances for Metallic-Coat
49、edRound Tubing (inch-pound units)Outside DiameterRange, in.Wall ThicknessTubing 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 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
