1、Designation: A 1057A 1057M 08Standard Specification forSteel, Structural Tubing, Cold Formed, Welded, Carbon,Zinc-Coated (Galvanized) by the Hot-Dip Process1This standard is issued under the fixed designation A 1057A 1057M; the number immediately following the designation indicates theyear of origin
2、al adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers cold-formed electric resistanceor elect
3、ric induction welded carbon structural steel tubing inround, square, rectangular, or special shapes that are zinc-coated (galvanized) on the exterior surface only, in continuouscoating lines by the hot-dip process. The tubing can bemanufactured from hot-rolled or cold-rolled steel. This productis in
4、tended for applications where corrosion resistance andmechanical properties are required. This product is available inseveral zinc coating weights masses, strengths, and chemicalcompositions.1.2 UnitsThe values stated in either SI units or inch-pound units shall be regarded separately as standard. T
5、hevalues stated in each system may not be exact equivalents;therefore, each system is to be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coati
6、ng onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 902 Terminology Relating to Metallic Coated Steel Prod-uctsA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 500/A 500M Specification for Cold-Formed Welded andSeamless Carbon Steel Structural Tubing in Rounds a
7、ndShapesA 924/A 924M Specification for General Requirements forSteel Sheet, Metallic-Coated by the Hot-Dip ProcessE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3. Terminology3.1 DefinitionsSee Terminology A 902 for definitions ofgeneral terminology
8、 relating to metallic-coated tube steelproducts.3.2 Definitions of Terms Specific to This Standard:3.2.1 acrylicpolymer based on resins prepared from acombination of acrylic and methacrylic esters, acrylic andmethacrylic acids, and styrene.3.2.1.1 DiscussionThe polymers contain functionalgroups such
9、 as amide, hydroxyl, or carboxyl and form thermo-setting systems on baking by cross linking with them, or withamino or epoxy resins.3.2.2 de-dimpledThe condition of the end of tubing afterremoval of the protrusion or deformation created by the punchcut operation.3.2.2.1 DiscussionThe dimple is a pro
10、trusion that isdisplaced from the inside diameter and is unrelated to a shearburr.3.2.3 structural tubingtubing tension tested with reportedtest results.4. Dimensions4.1 The product is available in the following sizes:Product WallThickness, maxExteriorDimension, maxRound Tubing 0.250 in.6.5 mmdiamet
11、er5.0 in. 125 mmSquare, Rectangular,or Special Shapes0.250 in.6.5 mmperiphery16.0 in. 405 mm5. Classification5.1 The tube material is available in the following designa-tions:5.1.1 Structural tubing steel STS 38, 48, 58, and 68.5.1.2 The material is available as zinc-coated in severalcoating weights
12、 masses as shown in Table 1.6. Ordering Information6.1 Welded tubing with the coating on the exterior surface isonly produced to thickness requirements expressed to 0.001 in.0.01 mm.1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is t
13、he direct responsibility ofSubcommittee A05.11 on Sheet Specifications.Current edition approved Nov. 15, 2008. Published November 2008.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume inf
14、ormation, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Orders for product to this specification shall include thefollowing information, as necessary, to adequatel
15、y describe thedesired product.6.2.1 Designation of product (STS)6.2.2 Coating designation (see Table 1)6.2.3 Chemical requirements (see Table 2)6.2.4 Mechanical requirements (see Table 3)6.2.5 Chemical treated or not chemical treated6.2.5.1 When chemical treatment is not specified, the prod-uct will
16、 be furnished as chemical treated,6.2.6 Top coated or not top treated (applied over chemicaltreatment)6.2.6.1 When “top coated” is not specified, the product willbe supplied with an acrylic coating,6.2.7 Oiled or not oiled6.2.7.1 When oiled is not specified, the product will beprovided as chemical t
17、reated.6.2.8 End condition6.2.8.1 When the removal of burrs is not specified, theproduct will be furnished with burrs,6.2.9 Mill cut or de-dimpled end condition6.2.9.1 When the end finish is not specified, mill cut will befurnished,6.2.10 Dimensions (show outside diameter and wall thick-ness for rou
18、nd tubing), (outside dimensions and wall thicknessfor square, rectangle, or special shapes), and length6.2.11 Quantity (length or weight)6.2.12 Certification (if required)6.2.13 End application6.2.14 Copper steel, when requiredNOTE 1Typical ordering descriptions are as follows: Structural tub-ing, z
19、inc-coated, designation STS Grade 38, ASTM A 1057, Coatingdesignation ZT 20, chemically treated, acrylic top coated, mill cut, 1.0 in.diameter by 0.065 wall thickness, 22 foot tubing length, order total length1000 feet, for snow blower handles; Structural tubing, zinc-coated, STSGrade 335, ASTM A 10
20、57M, Coating designation ZMT 150, chemicallytreated, acrylic coated, de-dimpled ends, mill cut, 6.7 mm outsidedimension by 16.5 mm wall thickness, 305 mm tubing length, order totallength 25,000 mm, for garage torque bar.7. Zinc Coating Requirements7.1 Zinc Coating Weight Mass7.1.1 The coating weight
21、 mass shall conform to require-ments shown in Table 1 for the specified coating designation.The thickness of the tube includes both the base metal and thecoating. See Specification A 924/A 924M for thickness toler-ances of hot dip coated product.7.1.2 The coating weight mass per unit area on the out
22、sidesurface of the tubing shall be determined in accordance withTest Method A 90/A 90M using a test specimen whose lengthis 4 in. 100 mm minimum. Two tests shall be taken from onelength of tubing selected from each lot of 500 pieces or fractionthereof. Both tests shall conform to the requirements. I
23、f theresults of any test specimen does not conform to the require-ments of the specification, two additional tests from the samelot shall be made, each of which shall conform to the specifiedrequirements.7.2 Coating Adhesion7.2.1 Specimens subjected to the flattening test of Specifi-cation A 500/A 5
24、00M shall exhibit no delamination (flaking orpeeling) of the zinc coating.7.3 Zinc Bath Analysis7.3.1 The coating bath metal shall not contain less than99 % zinc. In addition, the bath shall not contain more than0.005 % lead.7.3.2 To promote the adhesion of the coating, the composi-tion of the coati
25、ng bath is adjusted with additions of aluminumin the range of 0.05 to 0.25 %. Such aluminum is intentionallyadded directly to the molten bath or through the use of a masteralloy containing aluminum.8. Chemical Composition8.1 Base Metal8.1.1 The base metal shall be manufactured using the openhearth,
26、basic oxygen, or electric furnace process.8.1.2 The heat analysis shall conform to the requirements ofTable 2 for STS Grades 38, 48, 58, and 68.8.1.3 When specified on the order, a report of the heatanalysis shall be reported to the purchaser or his representative.8.1.4 See Specification A 924/A 924
27、M for chemical analy-sis procedures and product analysis tolerances.9. Mechanical Properties9.1 The zinc coated mechanical tubing shall conform to themechanical property requirements of Table 3.TABLE 1 Weight Mass of CoatingCoatingDesignationMinimum RequirementInch-Pound Units oz/sq ftZT 20 0.20ZT 3
28、0 0.30ZT 50 0.50ZT 60 0.60SI Units gm/sq mZMT 60 60ZMT 90 90ZMT 150 150ZMT 180 180TABLE 2 Chemical Requirements Composition, % Heat Analysis element, maxA,BDesignationSTS C Mn P S Al Si Cu Ni Cr Mo V Cb TiGrade 38265 0.18 1.35 0.035 0.035 . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025Grade 48335 0.18 1.3
29、5 0.035 0.035 . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025Grade 58405 0.25 1.35 0.035 0.035 . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025Grade 68 475 0.25 1.35 0.035 0.035 . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025AWhen an ellipsis (.) appears in this table, there is no requirement, but the analysis shall b
30、e reported. BBWhen copper steel is specified, the limit for copper is 0.20 % minimum.A 1057A 1057M 0829.2 Tests for mechanical properties shall be conducted inaccordance with the methods in Specification A 924/A 924Mexcept that the requirements of Test Methods A 370 for thepreparation of tubing-test
31、 specimens shall apply.10. Weld Test10.1 The integrity of the weld shall be determined inconjunction with the flattening test described in SpecificationA 500/A 500M.11. Other Requirements11.1 The product manufactured in accordance with thisspecification shall also conform to the following requiremen
32、tswhich are found in Specification A 500/A 500M:(1) Flattening Test(2) Permissible Variations in Dimensions(3) Special Shape Structural Tubing(4) Number of Tests(5) Retests(6) Test Methods(7) Inspection(8) Rejection(9) Certification(10) Product Marking(11) Packing, Marking, and Loading(12) Governmen
33、t Procurement12. Keywords12.1 cold formed tubing; one-side zinc-coated; structuraltubing; tubing; zinc coatedASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised
34、that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reap
35、proved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you
36、 feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual
37、reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 3 Mechanical RequirementsDesignationSTSYield Strength Tensile Stre
38、ngthElongation in 2 in. 50mmmin, ksi MPa min, ksi MPa min, %Grade 38 38 265 45 310 23AGrade 48 48 330 55 380 20AGrade 58 58 400 65 450 18BGrade 68 68 465 75 518 15BAApplies to specified wall thicknesses (t) of 0.120 in. 3.0mm and over. For wall thicknesses under .120 in. 3.0mm, the minimum elongatio
39、n shall be calculated usingthis formula: Elongation, in. = 56t + 17.5 Elongation, mm = 2.32t +1.75 The value for elongation shall be rounded to the nearest percent in accordance with Practice E29.BApplies to specified wall thicknesses of 0.120 in. 3.0mm and over. For wall thicknesses under 0.120 in., 3.0mm, the minimum elongation shall be subject to agreementbetween the manufacturer and the purchaser.A 1057A 1057M 083
