1、Designation: A787/A787M 14A787/A787M 15Standard 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
2、 case of revision, 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, and special shape, electric-resi
3、stance-welded mechanical tubing, eitherzinc-coated (galvanized) after welding or produced from aluminum-coated, zinc-coated (galvanized), zinc-iron alloy-coated(galvannealed), or 55 % aluminum-zinc alloy-coated steel sheet. Tubing for use as electrical conduit (EMT) or intermediatemetallic conduit (
4、IMC) is not covered by this specification.1.2 This specification covers mechanical tubing with outside diameters or maximum outside dimensions ranging from 12 to 15in. 12.7 to 380.0 mm and wall thickness from 0.028 to 0.180 in. 0.70 to 4.60 mm.1.3 Sizes outside the ranges listed above may be ordered
5、 provided all other requirements of the specification are met.1.4 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order specifies theapplicable M specification designation (SI units), the inch-pound units shall apply. The values stated in either
6、 SI units orinch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values statedin each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining valuesfrom the two systems may result
7、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 theHot-Dip ProcessA792/A792M
8、 Specification for Steel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA924/A924M Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip ProcessB6 Specification for Zinc3. Classification3.1 The types of tubing covered by this specification are:TypeNumbe
9、rCodeLettersDescription1 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
10、carbon steelmechanical tubing, zinc-iron alloy-coated (galvannealed)5 AWGZ electric-resistance-welded carbon steelmechanical tubing, 55 % aluminum-zincalloy-coated1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct respons
11、ibility of Subcommittee A01.09on Carbon Steel Tubular Products.Current edition approved May 1, 2014May 1, 2015. Published May 2014May 2015. Originally approved in 1981. Last previous edition approved in 20092014 asA787/A787M 09.A787/A787M 14. DOI: 10.1520/A0787_A0787M-14.10.1520/A0787_A0787M-15.2 Fo
12、r referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to pro
13、vide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the
14、 standard as published by ASTM is to be considered the official document.*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. Ordering Information4.1 The ordered wall thic
15、kness of the tubing shall be the total of the base metal and the metallic coating.4.2 Orders for material under this specification shall include 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 design
16、ation number(s),4.2.4 Coating designation and type of coating,4.2.5 Chemically treated or not chemically treated raw material,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 desi
17、gnation (Sections 5 and 9),4.2.11 Report of chemical analysis if required (Sections 10 and 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 orrectangularoutside dimension, wall t
18、hickness, and corner radii, if required. (See 12.1 and 13.1 and 13.2.)4.2.13 Length: round tubingmill lengths or definite cut lengths (see 12.2); square and rectangular tubingmill cut lengthsand specified length (see 13.4).4.2.14 Squareness of cut: round tubing, if required (see 12.3); square and re
19、ctangular 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 diameter weld and heat-affec
20、ted 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 the purchaser, it shall be stated on the purchase order.5.1.2 The primary melting may incorporate separate degassing or refining and may be followed by
21、secondary melting, usingelectroslag remelting or vacuum remelting. If secondary melting is employed, the heat shall be defined as all of the ingots remeltedfrom a single primary heat.5.1.3 Steel may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast,
22、identificationof the resultant transition material is required. The producer shall remove the transition material by an established procedure thatpositively separates the grades.5.2 For tubing produced from precoated steel sheet, the composition of the coating shall comply with the applicablespecifi
23、cation.5.2.1 Specification A463/A463MCoating designation for aluminum coated-sheet.5.2.2 Specification A653/A653MCoating designation for galvanized and galvannealed steel sheet.5.2.3 Specification A792/A792MCoating designation for 55 % aluminum-zinc alloy-coated steel sheet.5.2.4 Other grades of coa
24、ted steel sheet, as listed in Table 1 and Table 2, may be used as the precoated material for the steeltubing upon agreement between the manufacturer and the purchaser. Such steel sheet shall meet the requirements of SpecificationA463/A463M, A653/A653M, A792/A792M, and A924/A924M, except for the chem
25、ical requirements.6. Manufacture6.1 Tubes shall be made by the electric-resistance welding process and shall be made from hot or cold-rolled precoated steelexcept for Type 3.6.1.1 The weld shall not be located within the radius of the corners of any shaped tube unless specified by the purchaser.6.2
26、Special manufacturing practices allow for post-hot dipped galvanizing of welded tubing. If this product is desired allsections of this specification will apply except Table 3. Wall thickness tolerances shall be determined by agreement between theproducer and purchaser.7. Flash Conditions7.1 The flas
27、h conditions under which tubing may be furnished are as follows: The flash shall be removed from the outsidediameter of tubing covered by this specification. Tubing furnished to this specification may have the following conditions ofwelding flash on the inside diameter.A787/A787M 1527.1.1 Flash-InAl
28、l tubing in which the inside diameter welding flash does not exceed the wall thickness or 332 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. This condition
29、 is available in over 0.750 in. 19.0 mm outside diameter andgauges 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. 0.13 mmmaximum in tubing produced to outside diameter and wall thickness, inside diameter an
30、d wall thickness, or outside diameter andinside diameter tolerances, the remaining inside diameter flash, if any, is part of the applicable inside diameter tolerance. Thiscontrolled flash is available in 0.750 in. 19.0 mm outside diameter or greater.7.2 Tubes shall be furnished in the following shap
31、es, as specified by the purchaser: round, square, rectangular, or special shapes(as negotiated).7.3 Recoating of the outside diameter weld-heat-affected area on precoated steel tubing may be performed at the manufacturesoption, if not specifically requested by the purchaser.8. Surface Finish8.1 Spec
32、ial surface finishes as may be required for specific applications shall be provided in the purchase order by agreementbetween the producer and purchaser.9. Base Metal Chemical Composition9.1 The chemical composition of the sheet steel base metal shall conform to the requirements of Table 1.9.2 Coppe
33、r-bearing steel, with 0.20 % minimum copper, may be ordered in any of the grades shown in Table 1 or Table 2.9.3 An analysis of each heat of steel shall be made by the basic steel producer to determine the percentage of the elementsspecified. The heat analysis, as supplied by the steel melter, shall
34、 conform to the requirements of Table 1 or Table 2.9.4 When a grade is ordered under this specification, supplying an alloy grade that specifically requires the addition of anyelement other than those listed for the ordered grade in Table 1 and Table 2 is not permitted.TABLE 1 Chemical Requirements
35、for Low-Carbon SteelsA ,BGradeDesignationCComposition, %Carbon ManganesePhos-phorus,maxSulfur,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
36、to 1.00 0.035 0.035A Rimmed or capped steels that may be used for the above grades are charac-terized by a lack of uniformity in their chemical composition, and for this reasonproduct analysis is not technologically appropriate unless misapplication is clearlyindicated.B Chemistry represents heat an
37、alysis. Product analysis, except for rimmed orcapped steel, is to be in accordance with usual practice as shown in Table 7.C The letters MT indicate mechanical tubing.TABLE 2 Chemical Requirements for Other Carbon SteelsAGradeDesigna-tionComposition, %Carbon ManganesePhos-phorus,maxSulfur,max1008 0.
38、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 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
39、 0.90 0.035 0.035A Chemistry represents heat analysis. Product analysis, except for rimmed orcapped steel, is to be in accordance with usual practice as shown in Table 7.A787/A787M 153TABLE 3 Wall Thickness Tolerance for Premetallic Coated As-Welded TubingA (inch-pound units)Outside Diameter, in.Wal
40、l Thickness 12 to 1, incl Over 1 to11516, inclOver 11516 to334, inclOver 334 to412, inclOver 412 to6, inclOver 6 to8, inclOver 8 to10, inclOver 10 to12, inclOver 12 to15, inclWall Thickness Tolerance, in., Plus and MinusBWGB in. Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus
41、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 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 0.00
42、5 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 0.010 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 0.01412 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
43、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 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
44、.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 0.013 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 0.01A Post-hot dipped galvanized welded tubing wall t
45、hickness tolerances shall be determined by agreement between the producer and purchaser (6.2).B Birmingham Wire Gauge.A787/A787M154TABLE 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,
46、 incl Over 100 to 150, incl Over 150 to 200, incl Over 200 to 250, incl Over 250 to 375, inclWall Thickness 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.
47、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 0.20 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
48、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 0.18 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/A787M15510. Coating Bat
49、h Chemical Composition10.1 When tubing is produced from precoated sheet steel, the tubing manufacturer shall furnish, upon request, a report statingthat the tubing has been manufactured from precoated sheet 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 shall be any grade of zinc conforming to Specification B6.11. Product Analysis11.1 When requested on the purchase order, a product analysis shall be made by the supplier.The number
