1、Designation: A 675/A 675M 03 (Reapproved 2009)Standard Specification forSteel Bars, Carbon, Hot-Wrought, Special Quality,Mechanical Properties1This standard is issued under the fixed designationA 675/A 675M; the number immediately following the designation indicates the yearof original adoption or,
2、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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1
3、This specification2covers hot-wrought special qualitycarbon steel bars and bar size shapes produced to mechanicalproperty requirements and intended for general constructionalapplications.1.2 The bars are available in nine strength grades designated45, 50, 55, 60, 65, 70, 75, 80, and 90 310, 345, 380
4、, 415, 450,485, 515, 550, and 620 corresponding to the minimumultimate tensile strength in ksi MPa. The chemical composi-tion is selected by the manufacturer to develop the requiredmechanical properties.1.3 Hot-wrought special quality carbon steel bars subject tomechanical property requirements are
5、hot wrought in straightlengths only. Sections and sizes available are covered inSpecification A 29/A 29M.1.4 Some applications may require one or more of theavailable designations shown under Supplementary Require-ments.NOTE 1Merchant-quality hot-wrought carbon steel bars subject tomechanical proper
6、ty requirements are covered in Specification A 663/A 663M.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalu
7、es from the two systems may result in non-conformancewith the standard.2. Referenced Documents2.1 ASTM Standards:3A 29/A 29M Specification for Steel Bars, Carbon andAlloy,Hot-Wrought, General Requirements forA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 663/A 663M Speci
8、fication for Steel Bars, Carbon, Mer-chant Quality, Mechanical PropertiesE 290 Test Methods for Bend Testing of Material forDuctility3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 special qualitySpecial quality bars are used whenend use, method of fabrication, or subsequent p
9、rocessingtreatment requires quality characteristics not available in mer-chant quality. Typical applications involve bending or machin-ing for general constructional uses. Some end uses or fabricat-ing procedures can necessitate one or more requirements whichare described in the Supplementary Requir
10、ements.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following information:4.1.1 Quantity (weight or number of pieces),4.1.2 Name of material (hot-wrought special quality bars),4.1.3 Dimensions, including length,4.1.4 Cross section (round, square, hexagon,
11、 equal legangle, etc.),4.1.5 Specification designation and date of issue,4.1.6 Grade designation (Table 1),4.1.7 Leaded steel, if required (6.2),4.1.8 Copper bearing steel, if required (6.3),4.1.9 Test report, if required (Section 10),4.1.10 Supplementary Requirements or special require-ments if req
12、uired, and4.1.11 Application and processing.NOTE 2A typical ordering description is as follows: 10 000 lb, 5000kg Hot Wrought Special Quality Carbon Steel Bars, 1 in. diameter 3 10ft, 25m 3 3m Round, ASTM A 675/A 675M dated _ , Grade 50,345 Copper Bearing, Test Report Required, S3 Special Straightne
13、ss,Boiler Supports.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved April 1, 2009. Published April 2009. Originallyapproved in 1972. Last previous ed
14、ition approved in 2003 as A 675/A 675M 031.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA 675 in Section II of that Code.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of
15、ASTMStandards volume information, 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.5. Materials and Manufacture5.1 Melting PracticeThe steel shall be made by one ormore o
16、f the following primary processes: open-hearth, basic-oxygen, or electric-furnace. The primary melting may incor-porate separate degassing or refining and may be followed bysecondary melting using electroslag remelting or vacuum-arcremelting. Where secondary melting is employed, the heatshall be def
17、ined as all of the ingots remelted from a singleprimary heat.5.2 Deoxidation:5.2.1 Unless otherwise specified, the steel shall be rimmed,capped, semi-killed, or killed at the producers option.5.2.2 When required, the purchaser may specify the re-quired deoxidation practice, dependent upon strength g
18、radespecified, purchasers methods of fabrication, and end userequirements. Killed steels can be produced to coarse or fineaustenitic grain size (Supplementary Requirement S1).5.3 ConditionUnless otherwise specified, the bars shall befurnished as-rolled and not pickled, blast cleaned, or oiled. Atthe
19、 producers option, bars may be cleaned for inspection.6. Chemical Composition6.1 The steel shall conform to the chemical requirementsspecified in Table 2.6.2 Leaded SteelWhen required, lead may be specified asan added element. When lead is specified as an added element,a range from 0.15 to 0.35 % in
20、clusive shall be furnished. Sucha steel is identified by adding the letter L after the gradedesignation, for example 60L 415L.6.3 Copper-Bearing SteelWhen required copper may bespecified as an added element. Copper-bearing steel is identi-fied by stating “copper-bearing” on the purchase order.6.4 Wh
21、en tension tests are waived in accordance with7.1.1.2, chemistry consistent with the mechanical propertiesdesired shall be applied.7. Mechanical Properties7.1 Tension Tests7.1.1 Requirements:7.1.1.1 The material as represented by the test specimenshall conform to the applicable requirements in Table
22、 1.7.1.1.2 Shapes less than 1 in.2645 mm2 in cross sectionand bars (other than flats) less than12 in. 12.5 mm inthickness or diameter need not be subject to tension tests by themanufacturer.7.1.1.3 For material over34 in. 19 mm in thickness ordiameter, a deduction of 0.25 % from the percentage ofelo
23、ngation in 8 in. 200 mm specified in Table 1 shall be madefor each increase of132 in. 0.8 mm in the specified thicknessor diameter above34 in. 19 mm.7.1.1.4 For material under516 in. 8 mm in thickness ordiameter, a deduction of 2.00 % from the percentage ofelongation in 8 in. 200 mm specified in Tab
24、le 1 shall be madefor each decrease of132 in. 0.8 mm in the specified thicknessor diameter below516 in. 8 mm.7.1.1.5 For Grades 45, 50, 55, 60, and 65 310, 345, 380,and 415 for material over 2 in. 50 mm in thickness ordiameter, a deduction of 1.00 % from the percentage ofelongation in 2 in. 50 mm sp
25、ecified in Table 1 shall be madefor each 1 in. 25 mm of specified thickness or diameter orfraction thereof over 2 in. 50 mm in thickness or diameter.7.1.1.6 For Grades 70, 75, 80, and 90 485, 515, 550 and620 for material over 2 in. 50 mm in thickness or diameter,a deduction of 1.00 % from the percen
26、tage of elongation in 2in. 50 mm specified in Table 1 shall be made for each 1 in.25 mm of specified thickness or diameter, or fraction thereof,over 2 in. 50 mm in diameter or thickness, to a maximumdeduction of 3 %.7.1.2 Test Specimens:7.1.2.1 Test specimens shall be prepared for testing from thema
27、terial in its as-rolled condition unless otherwise specified(see Supplementary Requirements). The tension specimen maybe aged as described in Test Methods and Definitions A 370.7.1.2.2 Test specimens shall be taken longitudinally andmay be tested in full thickness or section, or they may bemachined
28、to the dimensions shown in Fig. 4 or Fig. 5 of TestMethods and Definitions A 370. If test specimens are selectedTABLE 1 Tensile RequirementsGradeDesigna-tionATensile Strength Yield Point, minBElongation, min, %Cksi MPa ksi MPa 8 in. or 200 mmGage Length2 in. or 50 mmGage Length45 310 45 to 55 310 to
29、 380 22.5 155 27 3350 345 50 to 60 345 to 415 25 170 25 3055 380 55 to 65 380 to 450 27.5 190 23 2660 415 60 to 72 415 to 495 30 205 21 2265 450 65 to 77 450 to 530 32.5 225 17 2070 485 70 to 85 485 to 585 35 240 14 1875 515 75 to 90 515 to 620 37.5 260 14 1880 550 80 min 550 min 40 275 13 1790 620
30、90 min 620 min 55 380 10 14AWhen lead is required, add the letter “L” after the grade designation, for example, 45L.BWhen the tension test does not show a yield point (drop of the beam, halt of the pointer or sharp-kneed stress-strain diagram), yield strength shall be determined byeither 0.5 % exten
31、sion-under-load or 0.2 % offset. The minimum ksi (MPa) requirement does not change. The test report, if required, shall show yield strength.CSee 7.1.1.3 through 7.1.1.6 for deduction in elongation due to section size.TABLE 2 Chemical Requirements (Heat Analysis)ElementPhosphorus, max 0.040Sulfur, ma
32、x 0.050Copper, when copper steel is specified, min 0.20LeadAAWhen required, lead may be specified as an added element. See 6.2.A 675/A 675M 03 (2009)2conforming to the dimensions of Fig. 5, they shall be machinedfrom a position midway between the center and the surface ofthe bar.7.1.2.3 Test specime
33、ns for shapes and flats may be ma-chined to the form and dimensions shown in Fig. 4 of TestMethods and Definitions A 370 or with both edges parallel.Test specimens for material over 112 in. 40 mm in thicknessor diameter may be machined to a thickness or diameter of atleast34 in. 20 mm for a length o
34、f at least 9 in. 230 mm, orthey may conform to the dimensions shown in Fig. 5 of TestMethods and Definitions A 370.7.1.3 Number of TestsTwo tension tests shall be madefrom each heat, unless the finished material from a heat is lessthan 50 tons 45 Mg, when one tension test will be sufficient.However,
35、 for material 2 in. 50 mm and under in thickness,when the material from one heat differs38 in. 9.5 mm or morein thickness, one tension test shall be made from both thethickest and the thinnest material rolled (larger than the sizes in7.1.1.2) regardless of the weight represented. For material over2
36、in. 50 mm thick, when the material from heat differs 1 in.25 mm or more in thickness, one tension test shall be madefrom both the thickest and the thinnest material rolled that ismore than 2 in. 50 mm thick regardless of the weightrepresented.7.1.4 Test MethodTension tests shall be made in accor-dan
37、ce with Test Methods and Definitions A 370 using theapplicable method for determining yield point.7.2 Bend Tests:7.2.1 Requirements:7.2.1.1 Bend requirements apply only to flat bars (all sizes),bars other than flats less than12 in. 12.5 mm in thickness ordiameter, and shapes less than 1 in.2645 mm2
38、in crosssection. When bend tests are required for other sizes, Supple-mentary Requirement S6 must be specified.7.2.1.2 The bend test specimen shall stand being bent atroom temperature through 180 without cracking on theoutside of the bent portion, to an inside diameter which shallhave the relation t
39、o the thickness or diameter of the specimenas given in Table 3.7.2.2 Test Specimens:7.2.2.1 Bend test specimens for material 112 in. 40 mmand under in diameter or thickness may be the full thickness ofthe section. For flat bars over 2 in. 50 mm in width, the widthmay be reduced by milling to 112 in.
40、 40 mm.7.2.2.2 Bend test specimens for material over 112 in. 40mm in diameter or thickness may be machined to a thicknessor diameter of at least34 in. 20 mm or to 1 by12 in. 25 by12.5 mm in section. Machined sides of bend test specimensmay have the corners rounded to a radius of not over116 in.1.6 m
41、m for material 2 in. 50 mm and under in thickness,and not over18 in. 3.2 mm in radius for material over 2 in.50 mm in thickness.7.2.3 Number of TestsWhen subject to bend test, two bendtests shall be made from each heat, unless the finished materialfrom a heat is less than 50 tons 45 Mg, when one ben
42、d testwill be sufficient. However, for material 2 in. 50 mm andunder in thickness, when the material from one heat differs38in. 9.5 mm or more in thickness, one bend test shall be madefrom both the thickest and the thinnest material rolled regard-less of the weight represented. For material over 2 i
43、n. 50 mmthick, when the material from one heat differs 1 in. 25 mm ormore in thickness, one bend test shall be made from both thethickest and the thinnest material rolled that is more than 2 in.50 mm thick regardless of the weight represented.7.2.4 Test MethodsBend tests shall be made in accordancew
44、ith Test Methods E 290.8. Workmanship, Finish, and Appearance8.1 Bars shall be free of visible pipe, undue segregation, andinjurious surface imperfections.8.2 Surface FinishThe bars shall have a commercialhot-wrought finish obtained by conventional hot rolling. See5.3 for producers descaling option.
45、9. General Requirements9.1 Material furnished under this specification shall con-form to the applicable requirements for the current edition ofSpecification A 29/A 29M.10. Certification10.1 When specified by the purchaser, a manufacturerscertification that the material was manufactured and tested in
46、accordance with this specification together with a report of theheat analysis, tensile requirements, and bend test (if applicable)test results shall be furnished. Only one test need be reportedwhen the amount of material from a heat in a shipment is lessthan 10 tons 9 Mg and when the thickness varia
47、tionsdescribed in (7.1.3) and (7.2.3) are not exceeded. The reportTABLE 3 Bend RequirementsGradeDesignationRatio of Bend Diameter to Thickness of Specimen for Thickness or Diameter of Bar, in. (mm)34 20 andUnderOver34 20 to1 25, inclOver 1 25 to112 40, inclOver 112 40 to2 50, inclOver 2 50 to3 75, i
48、nclOver 3 75 to5 125, inclOver 5 12545 310 flat flat12 112350 345 flat12 1112 212 331255 38012 1112 22121260 4151212 212 3312 465 450 1 112 23312 4570 485 112 2212 331275 515 2 2 3 312 4412 680 550 2 212 331212 690 620AABend requirements are not required for Grade 90 620, but may be specified by agr
49、eement between purchaser and manufacturer (see Supplementary RequirementS6).A 675/A 675M 03 (2009)3shall include the name of the manufacturer, ASTM designationnumber and year date and revision letter, if any, grade, heatnumber, and size.10.2 The thickness of the product tested may not necessarilybe the s
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