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ASTM A1057 - A 1057M - 08 (2014).pdf

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ASTM A1057 - A 1057M - 08 (2014).pdf

Designation A1057/A1057M − 08 Reapproved 2014Standard 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 theyear 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 resistanceor 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. This 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 separately 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 Standards2A90/A90M Test Method for Weight [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 in 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 terminology relating to metallic-coated tube steelproducts.3.2 Definitions of Terms Specific to This Standard3.2.1 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 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 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 sizesProduct WallThickness, maxExteriorDimension, maxRound Tubing 0.250 in.[6.5 mm]diameter5.0 in. [125 mm]Square, Rectangular,or Special Shapes0.250 in.[6.5 mm]periphery16.0 in. [405 mm]5. Classification5.1 The tube material is available in the following designa-tions5.1.1 Structural tubing steel STS 38, 48, 58, and 68.5.1.2 The material is available as zinc-coated in severalcoating 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 Products 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 ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United 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 STS6.2.2 Coating designation see Table 16.2.3 Chemical requirements see Table 26.2.4 Mechanical requirements see Table 36.2.5 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 chemicaltreatment6.2.6.1 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 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 end 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 weight6.2.12 Certification if required6.2.13 End 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 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 totallength 25,000 mm, for garage torque bar.7. Zinc Coating Requirements7.1 Zinc Coating Weight [Mass]7.1.1 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 A924/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 of 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 specifiedrequirements.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 shall 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 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 of 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.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 Cr Mo V Cb TiGrade 38[265] 0.18 1.35 0.035 0.035 ... ... 0.20 0.20 0.15 0.06 0.008 0.008 0.025Grade 48[335] 0.18 1.35 0.035 0.035 ... ... 0.20 0.20 0.15 0.06 0.008 0.008 0.025Grade 58[405] 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 be reported. BBWhen copper steel is specified, the limit for copper is 0.20 minimum.A1057/A1057M − 08 201429.2 Tests for mechanical properties shall be conducted inaccordance with the methods 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 The product manufactured in accordance with thisspecification shall also conform to the following requirementswhich are found in Specification A500/A500M1 Flattening Test2 Permissible Variations in Dimensions3 Special Shape Structural Tubing4 Number of Tests5 Retests6 Test Methods7 Inspection8 Rejection9 Certification10 Product Marking11 Packing, Marking, and Loading12 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 asserted 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 by 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 receive 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 International, 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 through the ASTM websitewww.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. [50mm]min, 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 elongation 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.A1057/A1057M − 08 20143

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