1、Designation: A1057/A1057M 08 (Reapproved 2014)Standard Specification forSteel, Structural Tubing, Cold Formed, Welded, Carbon,Zinc-Coated (Galvanized) by the Hot-Dip Process1This standard is issued under the fixed designation A1057/A1057M; the number immediately following the designation indicates t
2、heyear of original 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 re
3、sistanceor electric 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. T
4、his productis intended 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 separatel
5、y as standard. Thevalues 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:2A90/A90M Test Method for Weight
6、 Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA902 Terminology Relating to Metallic Coated Steel Prod-uctsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA500/A500M Specification for Cold-Formed Welded andSeamless Carbon Steel Structural Tubing i
7、n Rounds andShapesA924/A924M 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 A902 for definitions ofgeneral term
8、inology 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 functionalgrou
9、ps such 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 i
10、s a protrusion that is dis-placed from the inside diameter and is unrelated to a shear burr.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.
11、5 mmdiameter5.0 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 severalcoati
12、ng weights 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 Product
13、s and is the direct responsibility ofSubcommittee A05.11 on Sheet Specifications.Current edition approved May 1, 2014. Published May 2014. Originallyapproved in 2008. Last previous edition approved in 2008 as A1057/A1057M 08.DOI: 10.1520/A1057_A1057M-08R14.2For referenced ASTM standards, visit the A
14、STM 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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Unit
15、ed States16.2 Orders for product to this specification shall include thefollowing information, as necessary, to adequately 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
16、Table 3)6.2.5 Chemical treated or not chemical treated6.2.5.1 When chemical treatment is not specified, the prod-uct will 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
17、an acrylic coating,6.2.7 Oiled or not oiled6.2.7.1 When oiled is not specified, the product will beprovided as chemical treated.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 en
18、d finish is not specified, mill cut will befurnished,6.2.10 Dimensions (show outside diameter and wall thick-ness for round 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 E
19、nd application6.2.14 Copper steel, when requiredNOTE 1Typical ordering descriptions are as follows: Structuraltubing, zinc-coated, designation STS Grade 38, ASTM A1057, Coatingdesignation ZT 20, chemically treated, acrylic top coated, mill cut, 1.0 in.diameter by 0.065 wall thickness, 22 foot tubing
20、 length, order total length1000 feet, for snow blower handles; Structural tubing, zinc-coated, STSGrade 335, ASTM A1057M, 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 totallen
21、gth 25,000 mm, for garage torque bar.7. Zinc Coating Requirements7.1 Zinc Coating Weight Mass7.1.1 The coating weight 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 A9
22、24/A924M for thickness toler-ances of hot dip coated product.7.1.2 The coating weight mass per unit area on the outsidesurface of the tubing shall be determined in accordance withTest Method A90/A90M using a test specimen whose length is4 in. 100 mm minimum. Two tests shall be taken from onelength o
23、f tubing selected from each lot of 500 pieces or fractionthereof. Both tests shall conform to the requirements. If 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 speci
24、fiedrequirements.7.2 Coating Adhesion7.2.1 Specimens subjected to the flattening test of Specifi-cation A500/A500M 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 shal
25、l not contain more than0.005 % lead.7.3.2 To promote the adhesion of the coating, the composi-tion of the coating 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
26、aluminum.8. Chemical Composition8.1 Base Metal8.1.1 The base metal shall be manufactured using the openhearth, 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 o
27、f the heatanalysis shall be reported to the purchaser or his representative.8.1.4 See Specification A924/A924M for chemical analysisprocedures and product analysis tolerances.9. Mechanical Properties9.1 The zinc coated mechanical tubing shall conform to themechanical property requirements of Table 3
28、.TABLE 1 Weight Mass of CoatingCoatingDesignationMinimum RequirementInch-Pound Units oz/sq ftZT 20 0.20ZT 30 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 C
29、r 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 1.35 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 0.00
30、8 0.008 0.025AWhen an ellipsis (.) appears in this table, there is no requirement, but the analysis shall be reported. BBWhen copper steel is specified, the limit for copper is 0.20 % minimum.A1057/A1057M 08 (2014)29.2 Tests for mechanical properties shall be conducted inaccordance with the methods
31、in Specification A924/A924Mexcept that the requirements of Test Methods A370 for thepreparation of tubing-test specimens shall apply.10. Weld Test10.1 The integrity of the weld shall be determined inconjunction with the flattening test described in SpecificationA500/A500M.11. Other Requirements11.1
32、The product manufactured in accordance with thisspecification shall also conform to the following requirementswhich are found in Specification A500/A500M:(1) Flattening Test(2) Permissible Variations in Dimensions(3) Special Shape Structural Tubing(4) Number of Tests(5) Retests(6) Test Methods(7) In
33、spection(8) Rejection(9) Certification(10) Product Marking(11) Packing, Marking, and Loading(12) Government 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 ass
34、erted in connection with any item mentionedin this standard. Users of this standard are expressly advised 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 b
35、y the responsible technical committee and must be reviewed every five years andif not revised, either reapproved 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 rece
36、ive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you 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 Inte
37、rnational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual 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 throu
38、gh the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 3 Mechanical RequirementsDesignationSTSYield Strength Tensile StrengthElongation in 2 in. 50mmmin, ksi MPa min, ksi MPa min, %Grade 38 38 265 45 31
39、0 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 elongation shall be calculated usingthis formula: Elongation, in. = 56t + 17.5 Elongation,
40、 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.A1057/A1057M 08 (2014)3
