1、Designation: A769/A769M 05 (Reapproved 2010)A769/A769M 17Standard Specification forCarbon and High-Strength Electric Resistance Forge-Welded Steel Structural Shapes1This standard is issued under the fixed designation A769/A769M; the number immediately following the designation indicates the yearof o
2、riginal adoption or, in the 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 Scope*1.1 This specification covers carbon and high-strength st
3、eel shapes of structural quality manufactured by the electric-resistanceforge-welding process from coils.1.2 The size range covered is described in nominal dimensions for columns, beams, and tees.Size Range, in. (mm)Web thickness 0.060 to 0.375 1.5 to 10Web thickness 0.060 to 0.500 1.5 to 12.7Flange
4、 thickness 0.060 to 0.500 1.5 to 12.7Overall depth 2.00 to 24.00 50 to 600Flange width 0.50 to 12.00 12.7 to 3001.3 These shapes are intended for two classes of application:1.3.1 Class 1General structural use where static loading predominates.1.3.2 Class 2Structural use where fatigue loading occurs
5、and is a principal design consideration.NOTE 1CautionCautionBecauseBecause of the absence of smooth, integral, large radius fillets at the junctions of the webs and the flanges (seeFig. 1), fatigue limits of resistance forge-welded shapes in torsion, lateral loading, and flexure are usually lower th
6、an those for hot-rolled shapes of similarsize and material. Users should consult shape manufacturers for recommended values of fatigue limits for each specific use, material, and size in caseswhere dynamic loading is a principal design consideration.1.4 When the steel is to be welded, it is presuppo
7、sed that a welding procedure suitable for the grade of steel and intended useor service will be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated i
8、n eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.6 The following safety hazards caveat pertains only to the test methods portion, Section 10, of this spec
9、ification:This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.1.7 This in
10、ternational standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) C
11、ommittee.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA568/A568M Specification for Steel, Sheet, Carbon, Structural,
12、 and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled,General Requirements for1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.02on Structural Steel for Bridges, Buildings, Rolling
13、 Stock and Ships.Current edition approved April 1, 2010June 1, 2017. Published July 2010June 2017. Originally approved in 1979. Last previous edition approved in 20052010 asA769/A769M 05.A769/A769M 05 (2010). DOI: 10.1520/A0769_A0769M-05R10.10.1520/A0769_A0769M-17.2 For referencedASTM standards, vis
14、it 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 provide the user of an ASTM standa
15、rd 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 standard as published by ASTM
16、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 States1A635/A635M Specification for Steel, Sheet and Strip, Heavy-Thickness Coils, Hot
17、-Rolled, Alloy, Carbon, Structural,High-Strength Low-Alloy, and High-Strength Low-Alloy with Improved Formability, General Requirements forA700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment2.2 American Welding Society Standard:AWS Specification D 1.1 Structural We
18、lding Code33. Ordering Information3.1 Orders for material under this specification should include the following, as required, to describe the desired materialadequately:3.1.1 Quantity (total number of feet (metres) or lengths),3.2 ASTM designation and year of issue, grade, and class,3.3 Shape and si
19、ze,3.4 Length of each piece,3.5 Information on intended application,3.6 Other special requirements, and3.7 Required certification and test reports.4. Materials and Manufacture4.1 The shapes shall be manufactured from coils by the electric-resistance forge-welding process. All components of a shapesh
20、all be furnished to the same grade unless otherwise specified.4.2 For Class 1 shapes the average width of weld at the joint to the flange shall be more than 110 % of the nominal web thickness(see Fig. 1(b). The acceptability of coil-splice welds in webs and flanges shall be subject to negotiation be
21、tween the purchaserand the manufacturer.4.3 For Class 2 shapes the average width of weld at the joint to the flange shall be more than 130 % of the nominal webthickness (see Fig. 1(b). Coil-splice welds shall not be permitted.4.4 Flash caused by welding will not be removed unless indicated on the pu
22、rchase order.3 Available from American Welding Society (AWS), 550 NW LeJeune Rd., 8669 NW 36 St., #130, Miami, FL 33126,33166-6672, http:/www.aws.org.FIG. 1 Appearance of Peel Test CriteriaA769/A769M 172NOTE 2Flash is considered to be non-structural.5. Chemical Composition5.1 An A chemical analysis
23、of each heat of steel shall be made by the steel manufacturer. The chemical composition thusdetermined shall conform to the requirements of Table 1, subject to the product analysis tolerances in Specification. The steelmanufacturer shall provide a test report A6/A6M for plate steels or Specification
24、of the heat analysis to the A568/A568M for sheetsteels. shape manufacturer. Heat analysis reports shall be furnished by the shape manufacturer upon request. to the shape purchaser.5.2 The steel supplier,manufacturer, shape manufacturer, and the shape purchaser shall establish a chemical composition,
25、 whichwill assure the purchaser of the desired properties while providing the shape manufacturer with material that is weldable by theelectric-resistance welding process.6. Tension Test6.1 The material as represented by the test specimen shall conform to the requirements of tensile properties prescr
26、ibed in Table2.6.2 The shape manufacturer shall furnish, upon request, furnish test reports of tensile properties determined in accordance withSections 8, 9, and 10.7. Permissible Variations in Dimensions7.1 Unless otherwise agreed upon by the shape manufacturer and the purchaser, dimensional variat
27、ions shall conform toSpecification A6/A6M (13.3(12.3 and Tables 16 to Tables 24 inclusive) for shapes of similar dimensions. Thicknesses of the shapecomponents shall be based on nominal thicknesses conforming to Specification A6/A6M (TableTable 1, 1, plate) or SpecificationA568/A568M (Tables 4 and T
28、ables 5, sheet). 5) for material thickness between 0.031 to 0.230 in. inclusive or SpecificationA635/A635M (Tables 2 and Tables 3) for material thickness between 0.230 to 1.000 in. inclusive. Nominal thickness shall bedefined as the minimum thickness specified plus one half the allowable thickness t
29、olerance as shown in the tables. The nominalweight per foot of the shape shall be calculated based on the nominal thickness and allowable variations in weight shall beequivalent to allowable variations in thickness.TABLE 1 Chemical RequirementsAGeneral Limitations, %Carbon 0.26 maxManganese 0.30 min
30、 to 1.65 maxPhosphorus 0.04 maxPhosphorus 0.03 maxSulfur 0.05 maxSulfur 0.035 maxSilicon 0.60 maxA The choice and use of alloying elements (combined with carbon, manganese,phosphorus, and sulfur within the limits prescribed) to provide the specifiedmechanical properties, or to enhance the atmospheri
31、c corrosion resistance, orboth, may vary with manufacturer and thickness of material. Elements commonlyadded include: boron, chromium, copper, molybdenum, nickel, silicon, vanadium,titanium, zirconium, and columbium. The heat analysis, including the alloyingelements intentionally added, shall be rep
32、orted to the purchaser. Permittedvariations in product analysis shall be within the limits established in Table BA ofSpecification A6/A6M. for plate steel coils or Specification A568/A568M for sheetsteel coils.A769/A769M 1738. Number of Tests8.1 Tension Tests:8.1.1 For steel ordered from the steel m
33、anufacturer as coiled sheet or plate to minimum mechanical properties (ASTM orequivalent), the shape manufacturer may certify his steelproduct based on manufacturers the steel manufacturers test reports ofmechanical properties. Two tension tests, taken longitudinally, shall be made by the steel manu
34、facturer from each heat, unless thefinished material from a heat is less than 50 ton 50 Mg, in which case one tension test will be sufficient. When material rolledfrom one heat differs 0.050 in. 1.2 mm or more in thickness, one tension test shall be made from both the thickest and thinnestmaterial r
35、olled regardless of the weight represented.8.1.1.1 In addition, the shape manufacturer shall make one tension test using a specimen which is representative of theapproximate middle of the original coil length.8.1.2 For heavy thickness coils ordered to minimum mechanical properties, make one tension
36、test of the end lap either by thesteel manufacturer as in 8.1.1 or by the shape manufacturer.8.1.2.1 In addition, the shape manufacturer shall make one tension test using a specimen which is representative of theapproximate middle of the original coil length. Make these tests on the product of two c
37、oils from each heat for each nominalthickness which differs by more than 0.050 in. 1.2 mm from the thickness already tested for that heat.8.1.2 For all steel not made to minimum mechanical properties, regardless of thickness, the shape manufacturer shall make thetests as in 8.1.2for each coil. coil
38、per the requirements of Specification A6/A6M, sections 11.4.2, 11.4.3, or 11.4.4 (Tables B andC shall be followed) as applicable. Specimens taken for testing from the middle of the original coil length shall, in addition, betaken from the approximate quarter point of the original coil width.8.2 Peel
39、 Tests:8.2.1 One peel test, 8.210.2, is required on both sides of each butt weld on the flanges and web. A short (2 to 5 ft) sample shallbe cut from the section and a peel test shall be performed on both ends of the section, on both welds.8.3 Tee Tension TestsOne tee tension test, 8.310.3, is requir
40、ed of each weld for each lot.8.3.1 A lot consists of not more than 1 h of welding of material of unchanged dimensions and heat number. A new lot will bestarted in the event of a dimension change or start of a new heat of steel for any component of the shape.9. Retests9.1 If one tension test fails, r
41、un two more tension tests from an adjacent location of the same parent coil. Both retests shallconform to the requirements prescribed in this specification; otherwise, the product of all coils represented by those tests shall standrejected.9.2 If the results of the peel tests and tee tension tests r
42、epresenting any lot do not meet a requirement as specified in Section10, make two retests, one on each side of and adjacent to the original test, from the same lot. Each retest shall meet the requirementsspecified, or the lot represented by the retests shall be rejected.10. Test Methods10.1 Tension
43、Test:10.1.1 The tension specimens required by this specification shall conform to those described in the latest issue of Test MethodsA370.10.1.2 Take all tension test specimens longitudinally. Remove all burrs from the specimens and ensure that there are no surfaceimperfections that would interfere
44、with proper determination of the tensile properties of the metal.10.1.3 Determine the mechanical properties, Table 2, in accordance with one of the methods described in Test Methods A370.10.2 Peel TestThe peel test is conducted to determine weld width and ductility. In this test it is necessary to s
45、eparate the flangefrom the web and the flange from the stem of tee sections mechanically for a length of approximately 2 in. (50 mm) by any methodthat places the weld bond plane in progressive, peeling tension. A slotted bending hook, Fig. 2(a), is preferred. Fracture may beinitiated on the bond pla
46、ne by a notch pressed or sawed into the end of the specimen along the weld bond plane (Fig. 2(c). StrikingTABLE 2 Mechanical PropertiesGrade 36 45 45WA 50 50WA 60 80Tensile strength, min, psi MPa 53 00036560 00041565 00045065 00045070 00048575 00052090 000620Yield point, min, psi MPa 36 00025045 000
47、31045 00031050 00034550 00034560 00041580 000550Elongation, min, %in 2 in. 50 mm 22 19 19 17 17 17 17in 8 in. 200 mmB 15 14 14 12 12 12 12A The suffix “W“W” indicates steel grades having atmospheric corrosion resistance approximately two times that of carbon structural steel with copper.B See elonga
48、tion requirement adjustments under the Tension Tests section of Specification A6/A6M. See specimen orientation in the Tension Tests section of SpecificationA6/A6M.A769/A769M 174TABLE 3 Common Sizes of Electric Resistance Forge-Welded SectionsDesignation Area Weight Depth WebThicknessFlangeWidthFlang
49、eThicknessDepth lb/ft in2mm2lb/ftkg/min. mm in. mm in. mm in. mm3.50 3.23 0.9326013.234.813.5 89 0.0952.43.25 83 0.0952.43.63 3.61 1.0416723.615.373.625920.1052.73.25 83 0.1052.74.00 3.75 1.0806973.755.584.001020.1052.73.25 83 0.1052.75.50 3.88 1.1227243.885.775.501400.0952.43.25 83 0.0952.46.00 4.46 1.2908324.466.646.001520.1052.73.25 83 0.1052.76.50 4.02 1.1817624.025.986.501650.0902.32.50 64 0.1203.18.00 6
