1、Designation: A1076/A1076M 12Standard Specification forCold Formed Carbon Structural Steel Tubing Made fromMetallic Precoated Sheet Steel1This standard is issued under the fixed designation A1076/A1076M; the number immediately following the designation indicates theyear of original adoption or, in th
2、e 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 round, square, rectangular, andspecial shape, electric-resis
3、tance-welded structural tubing pro-duced from precoated sheet steel with the following coatingson both sides: zinc (galvanized) or 55% aluminum-zinc alloy.This product is intended for applications requiring minimummechanical properties and corrosion resistance of both exteriorand interior surfaces.1
4、.2 This specification is applicable to orders in eitherinch-pound units (as A1076) or SI units (as A1076M). Withinthe text, SI units are shown in brackets. The values stated ineither SI units or inch-pound units are to be regarded separatelyas standard. The values stated in each system may not be ex
5、actequivalents; therefore, each system shall be used independentlyof the other. Combining values from the two systems mayresult in non-conformance with the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of th
6、e user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA
7、370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA902 Terminology Relating to Metallic Coated Steel Prod-uctsA500/A500M Specification for Cold-Formed Welded andSeamless Carbon Steel Structural Tubing in Rounds andShapesA924/A924M Specification for General Requirements forSteel
8、 Sheet, Metallic-Coated by the Hot-Dip Process3. Terminology3.1 DefinitionsSee Terminology A902 for definitions ofgeneral terminology relating to metallic-coated hot-dip prod-ucts.3.2 Definitions of Terms Specific to This Standard:3.2.1 de-dimpled, adjthe condition of the end of tubingafter removal
9、of the protrusion or deformation created by thepunch cut operation.3.2.1.1 DiscussionThe dimple is a protrusion that is dis-placed from the inside diameter and is unrelated to a shear burr.3.2.2 structural tubing, ntubing tension tested with re-ported test results.4. Product Size4.1 The standard cov
10、ers products available in the followingsizes:ProductWall Thickness,maxExterior Dimension,maxRound Tubing 0.25 in. 6.35 mm Diameter 5 in. 130 mmSquare,Rectangular, orSpecial Shapes0.25 in. 6.35 mm Periphery 16 in. 405 mm5. Classification5.1 The finished tube is available in the following designa-tion
11、s:5.1.1 Round structural tubing steel grade with minimumyield strength 33 ksi 230 MPa, 42 ksi 290 MPa, and 46 ksi315 MPa in the finished tube.5.1.2 Shaped structural tubing steel grade with minimumyield strength 39 ksi 270 MPa, 46 ksi 315 MPa, and 50 ksi345 MPa in the finished tube.5.1.3 The finishe
12、d tube is available as zinc-coated or 55%aluminum-zinc alloy-coated with a recommended minimum of0.40 oz/ft2120 g/m2 total both sides.6. Ordering Information6.1 The ordered wall thickness of the tubing shall be thetotal of the base metal and the metallic coating.1This specification is under the juri
13、sdiction 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 July 1, 2012. Published September 2012. DOI:10.1520/A1076_A1076M-12.2For referenced ASTM standards, visit the AS
14、TM 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. Unite
15、d States16.2 Orders for product to this specification shall include thefollowing information, as necessary, to adequately describe thedesired product.6.2.1 Steel grade designation,6.2.2 Chemically treated or not chemically treated rawmaterial,6.2.3 Coating designation,6.2.4 Organic or inorganic coat
16、ing if required,6.2.5 Oiled or dry,6.2.6 End condition,6.2.6.1 Burrs removed if required,6.2.7 Mill cut or de-dimpled end condition,6.2.7.1 When the end finish is not specified, mill cut will befurnished,6.2.8 Dimensions (show outside diameter and wall thick-ness for round tubing), (outside dimensio
17、ns and wall thicknessfor square, rectangle, or special shapes), and length,6.2.9 Quantity (length or weight),6.2.10 Mill certification (if required),6.2.11 End-use application, and6.2.12 Recoating of outside diameter weld and heat-affectedarea of coating, if required.7. Coating Properties7.1 Zinc Co
18、ating Weight Mass:7.1.1 Coating weight mass shall conform to the require-ments as shown in Table 1 for the specific coating designation.The thickness of the tube includes both the base metal and thecoating.7.1.2 Use the following relationships to estimate the coatingthickness from the coating weight
19、 mass:7.1.2.1 1 oz/ft2coating weight = 1.7 mils coating thickness7.1.2.2 7.14 g/m2coating mass=1mcoating thickness7.2 55% Aluminum-Zinc Coating Weight Mass:7.2.1 Coating weight mass shall conform to the require-ments as shown in Table 2 for the specific coating designation.7.2.2 Use the following re
20、lationships to estimate the coatingthickness from the coating weight mass:7.2.2.1 1 oz/ft2coating weight = 3.2 mils coating thickness7.2.2.2 3.75 g/m2coating mass=1mcoating thickness7.3 Coating Weight To Coating Mass Conversion:7.3.1 1 oz/ft2coating weight = 305.15 g/m2coating mass7.4 Coating Weight
21、 Mass Tests:7.4.1 Coating weight mass tests shall be performed inaccordance with the requirements of Specification A924/A924M.7.4.2 The referee method to be used shall be Test MethodA90/A90M.8. Chemical Composition8.1 Base Metal:8.1.1 The base metal shall be manufactured using the basicoxygen or ele
22、ctric furnace process.TABLE 1 Weight Mass of Zinc Coating RequirementsANOTE 1Use the information provided in 7.1.2 to obtain the approximate coating thickness from the coating weight mass.Minimum RequirementBTriple-Spot Test Single-Spot TestInch-Pound UnitsType Coating Designation Total Both Sides,
23、oz/ft2One Side Total Both Sides, oz/ft2Zinc G235 2.35 0.80 2.00G210 2.10 0.72 1.80G185 1.85 0.64 1.60G165 1.65 0.56 1.40G140 1.40 0.48 1.20G115 1.15 0.40 1.00G100 1.00 0.36 0.90G90 0.90 0.32 0.80G60 0.60 0.20 0.50G40 0.40 0.12 0.30G30 0.30 0.10 0.25G01 no minimum no minimum no minimumSI UnitsType Co
24、ating Designation Total Both Sides, g/m2One Side Total Both Sides, g/m2Zinc Z700 700 238 595Z600 600 204 510Z550 550 190 475Z500 500 170 425Z450 450 154 385Z350 350 120 300Z305 305 110 275Z275 275 94 235Z180 180 60 150Z120 120 36 90Z90 90 30 75Z001 no minimum no minimum no minimumAThe coating design
25、ation number is the term by which this product is specified. Because of the many variables and changing conditions that are characteristic ofcontinuous hot-dip coating lines, the zinc coating is not always evenly divided between the two surfaces of a coated sheet; nor is it always evenly distributed
26、 from edgeto edge. However, the minimum triple-spot average coating weight (mass) on any one side shall not be less than 40 % of the single-spot requirement.BNo minimum means that there are no established minimum requirements for triple- and single-spot tests.A1076/A1076M 1228.1.2 The heat analysis
27、shall conform to the requirements ofTable 3.9. Mechanical Properties of Finished Tube9.1 The precoated mechanical tubing shall conform to themechanical properties of Tables 4 and 5.9.2 Tests for mechanical properties shall be conducted inaccordance with the methods specified in Specification A924/A9
28、24M except that the requirements of A370 for the prepara-tion of tubing-test specimen shall apply.10. Flattening Test10.1 The integrity of the weld shall be determined inconjunction with the flattening test described in SpecificationA500/A500M. The flattening test shall be made on roundstructural tu
29、bing. A flattening test is not required for shapedstructural tubing.11. Oiling11.1 When specified, tubing shall have a protective coatingapplied before shipping to retard white rust of the metalliccoating on closely nested products and red rust on non-recoatedoutside diameter weld areas. Should the
30、order specify shipmentwithout a protective coating, the lubricant incidental to manu-facturing will remain and the purchaser will assume responsi-bility for rust in transit and storage.TABLE 2 Weight Mass of 55% Aluminum-Zinc CoatingRequirementsANOTE 1Use the information provided in 7.2.2 to obtain
31、the approxi-mate coating thickness from the coating weight mass.Minimum RequirementsTriple-Spot Test Single-Spot TestInch-Pound UnitsCoating Designa-tionTotal Both Sides, oz/ft2Total Both Sides, oz/ft2AZ30 0.30 0.26AZ35 0.35 0.30AZ40 0.40 0.35AZ50 0.50 0.43AZ55 0.55 0.50AZ60 0.60 0.52Minimum Require
32、mentsTriple-Spot Test Single-Spot TestSI UnitsCoating Designa-tionTotal Both Sides, g/m2Total Both Sides, g/m2AZM100 100 85AZM110 110 95AZM120 120 105AZM150 150 130AZM165 165 150AZM180 180 155AThe coating designation number is the term by which this product is specified.Because of the many variables
33、 and changing conditions that are characteristic ofcontinuous hot-dip coating lines, the weight mass of the coating is not alwaysevenly divided between the two surfaces of a sheet, nor is the coating evenlydistributed from edge to edge. However, it can normally be expected that not lessthan 40 % of
34、the single-spot test limit will be found on either surface.TABLE 3 Chemical RequirementsA,B,CComposition, %Heat Analysis Element, max (unless otherwise shown)Designation Carbon Manganese Phosphorus Sulfur Si Al, min Cu Ni Cr Mo V Cb TiRound Grade 332300.15 1.35 0.04 0.04 . . . . . . 0.25 0.20 0.15 0
35、.06 0.008 0.008 0.03Round Grade 422900.18 1.35 0.04 0.04 . . . . . . 0.25 0.20 0.15 0.06 0.008 0.008 0.03Round Grade 463150.25 1.35 0.04 0.04 . . . . . . 0.25 0.20 0.15 0.06 0.008 0.008 0.03Shaped Grade 392700.15 1.35 0.04 0.04 . . . . . . 0.25 0.20 0.15 0.06 0.008 0.008 0.03Shaped Grade 463150.18 1
36、.35 0.04 0.04 . . . . . . 0.25 0.20 0.15 0.06 0.008 0.008 0.03Shaped Grade 503450.25 1.35 0.04 0.04 . . . . . . 0.25 0.20 0.15 0.06 0.008 0.008 0.03AWhere an ellipsis (. . .) appears in this table, there is no requirement, but the analysis shall be reported.BSi may be added as a strengthening elemen
37、t.CColumbium and Vanadium may be added singly or in combination for strengthening. When used, the maximum values in the table may be exceeded.TABLE 4 Mechanical Requirements of Round Structural TubingDesignationYield Strength,min, ksi MPaTensile Strength,min, ksi MPaElongation in2 in. 50 mm,min, %Gr
38、ade 33 230 33 230 45 310 25AGrade 42 290 42 290 58 400 23BGrade 46 315 46 315 62 425 21CAApplies to specified wall thicknesses (t) of 0.120 in 3.05 mm and over. For wallthicknesses under 0.120 in 3.05 mm, the minimum elongation shall be calculatedusing this formula: Elongation, in = 56t + 17.5, roun
39、ded to the nearest percent.BApplies to specified wall thicknesses of 0.180 in 4.57 mm and over. For wallthicknesses under 0.180 in 4.57 mm, the minimum elongation shall be calculatedusing this formula: Elongation, in = 61t + 12, rounded to the nearest percent.CApplies to specified wall thicknesses o
40、f 0.120 in 3.05 mm and over. For wallthicknesses under 0.120 in 3.05 mm, the minimum elongation shall be subject toagreement between the manufacturer and purchaser.TABLE 5 Mechanical Requirements of Shaped Structural TubingDesignationYield Strength,min, ksi MPaTensile Strength,min, ksi MPaElongation
41、 in2 in. 50 mm,min, %Grade 39 270 39 270 45 310 25AGrade 46 315 46 315 58 400 23BGrade 50 345 50 345 62 425 21CAApplies to specified wall thicknesses (t) of 0.120 in 3.05 mm and over. For wallthicknesses under 0.120 in 3.05 mm, the minimum elongation shall be calculatedusing this formula: Elongation
42、, in = 56t + 17.5, rounded to the nearest percent.BApplies to specified wall thicknesses of 0.180 in 4.57 mm and over. For wallthicknesses under 0.180 in 4.57 mm, the minimum elongation shall be calculatedusing this formula: Elongation, in = 61t + 12, rounded to the nearest percent.CApplies to speci
43、fied wall thicknesses of 0.120 in 3.05 mm and over. For wallthicknesses under 0.120 in 3.05 mm, the minimum elongation shall be subject toagreement between the manufacturer and purchaser.A1076/A1076M 12312. Other Requirements12.1 The requirements for the following can be found inSpecification A500/A
44、500M:12.1.1 Permissible Variations in Dimensions,12.1.2 Special Shape Structural Tubing,12.1.3 Number of Tests,12.1.4 Retests,12.1.5 Test Methods,12.1.6 Inspection,12.1.7 Rejection,12.1.8 Certification,12.1.9 Product Marking,12.1.10 Packing, Marking, and Loading, and12.1.11 Government Procurement.13
45、. Keywords13.1 55% aluminum-zinc alloy-coated; structural tubing;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
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48、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 multi
49、ple 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A1076/A1076M 124
