1、Designation: A696 90a (Reapproved 2012)Standard Specification forSteel Bars, Carbon, Hot-Wrought or Cold-Finished, SpecialQuality, for Pressure Piping Components1This standard is issued under the fixed designation A696; the number immediately following the designation indicates the year oforiginal a
2、doption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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.
3、1. Scope1.1 This specification2covers hot-wrought and cold-finished special quality carbon steel bars, in straight lengthsonly, subject to mechanical property requirements and intendedfor use in manufacturing components for pressure piping andother pressure-containing applications.1.2 The values sta
4、ted in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:3A29/A29M Specification for Steel Bars, Carbon and Alloy,Hot-
5、Wrought, General Requirements forA370 Test Methods and Definitions for Mechanical Testingof Steel Products3. Classification3.1 The bars are furnished in two grades as follows:3.1.1 Grade BTensile strength 60 000 psi (415 MPa),minimum; yield strength 35 000 psi (240 MPa), minimum.3.1.2 Grade CTensile
6、 strength 70 000 psi (485 MPa),minimum; yield strength 40 000 psi (275 MPa), minimum.3.2 The bars are intended for machining, welding, hotforming, and threading by machining or cold rolling.4. Ordering Information4.1 Orders for material under this specification shouldinclude the following informatio
7、n:4.1.1 Quantity (weight or number of bars),4.1.2 Name of material (carbon steel bars),4.1.3 Condition: hot wrought or cold finished (5.4.1),4.1.4 Finish (if descaled required, so state) (9.1),4.1.5 Dimensions (diameter, thickness, width, and length),4.1.6 Cross section (round, square, hexagon),4.1.
8、7 ASTM designation and date of issue,4.1.8 Grade (Table 1 and Table 2),4.1.9 End use, and4.1.10 Additions to the specification and supplementaryrequirements, if required.NOTE 1A typical ordering description is as follows: 10 000 lb,Carbon Steel Bars, Hot Wrought, Descaled, 1.000-in. diameter by 10 f
9、t,Round,ASTMA696 dated _, Grade B; Supplementary RequirementS1 Straightness 0.125 in. in any 5 ft.5. Materials and Manufacture5.1 Melting PracticeThe steel shall be made by one ormore of the following primary processes: open-hearth, basic-oxygen, or electric-furnace. The primary melting may incor-po
10、rate separate degassing or refining, and may be followed bysecondary melting using electroslag remelting or vacuum arcremelting. Where secondary melting is employed, the heatshall be defined as all of the ingots remelted from a singleprimary heat.5.2 DeoxidationThe steel shall be fully killed.5.3 Qu
11、alityThe bars shall be special quality.5.4 Hot or Cold Working:5.4.1 The bars shall be hot wrought or cold finished asspecified by the purchaser.5.4.2 Cold-finished bars reduced in cross-sectional areamore than 10 % by cold drawing or rolling shall be heat treatedas specified in 5.5.2.5.5 Heat Treat
12、ment:5.5.1 Except as provided in 5.5.2, the bars shall be furnishedas-hot wrought or as-cold finished.5.5.2 Cold-finished bars cold worked in excess of 10 % (see5.4.2) shall be stress relief annealed at not less than 1200F(649C), normalized, or fully annealed. The specific heattreatment shall be at
13、the option of the manufacturer.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 March 1, 2012. Published April 2012. Originallyapproved in 1974. Last
14、 previous edition approved in 2006 as A696 90a (2006).DOI: 10.1520/A0696-90AR12.2For ASME Boiler and Pressure Vessel Code Applications, see related Specifi-cation SA-696 in Section II of that Code.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service a
15、t serviceastm.org. For Annual Book of 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.6. Chemical Composition6.1 The heat analysis shal
16、l conform to the requirements forchemical composition specified in Table 1.6.2 A product analysis of the steel may be made by thepurchaser and shall conform to the requirements of Table 1subject to the product analysis tolerances specified in Specifi-cation A29/A29M.7. Tensile Requirements7.1 Requir
17、ements:7.1.1 The material, as represented by the test specimens,shall conform to the tensile requirements specified in Table 2.7.1.2 A deduction from the percentage of elongation speci-fied in Table 2 of 1.0 % shall be made for each 1.0 in.(25.4 mm) of specified diameter over 2.0 in. (51 mm) orfract
18、ion thereof to a maximum of 3 %.7.2 Specimens:7.2.1 Tension test specimens shall be taken longitudinallyfrom a position midway between the center and the surface ofthe bar or as close as practical to this location for small sizes.7.2.2 When it is impractical to remove specimens in accor-dance with 7
19、.2.1, they shall be taken in accordance with TestMethods and Definitions A370.7.3 Number of TestsOne tension test shall be made fromeach lot.Alot shall consist of all bars of one size from one heatprocessed at one time and subjected to the same heat treatmentwhen heat treated.7.4 Test MethodsTension
20、 tests shall be made in accor-dance with Test Methods and Definitions A370. The yieldstrength shall be determined by the 0.2 % offset or 0.5 %extension under load methods.8. Workmanship, Finish, and Appearance8.1 DescalingWhen descaled bars are required, Supple-mentary Requirement S7 must be specifi
21、ed.8.2 The bars shall be free of visible pipe and conditioned asnecessary to remove injurious surface imperfections.9. General Requirements9.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A29/A29M unless otherwise pr
22、ovided herein.10. Certification and Test Reports10.1 A manufacturers certification that the material wasmanufactured and tested in accordance with this specificationtogether with a report of the heat analysis and tension testresults shall be furnished at the time of shipment. The reportshall include
23、 the name of the manufacturer, ASTM designationnumber and grade, shape, size, and finish.11. Packaging and Package Marking11.1 Bars less than 2.0 in. (51 mm) in diameter or thicknessshall be tightly banded with a sufficient number of bands ofadequate strength to minimize bundle breakage during han-d
24、ling and shipping. Larger sizes shall be packaged in accor-dance with Specification A29/A29M.11.2 For bars less than 2.0 in. (51 mm) in diameter orthickness, each bundle shall bear a weather-resistant tagshowing the purchase order number, ASTM designation num-ber and grade, heat number, size, and na
25、me of manufacturer.11.3 Bars 2.0 in. (51 mm) and larger in diameter orthickness shall have the heat number steel stamped on one end.12. Keywords12.1 pressure piping components; special quality steel bars;steel barsTABLE 1 Chemical Requirements (Heat Analysis), %Grades B and CCarbon, maxA0.32Manganes
26、e, max 1.04Phosphorus, max 0.035BSulfur, max 0.045BSilicon 0.15 to 0.35LeadBAFor each reduction of 0.01 % below the specified carbon maximum, anincrease of 0.06 % manganese above the specified maximum will be permitted upto a maximum of 1.35 %.BPhosphorus, sulfur, or lead, or a combination thereof,
27、shall not be added.TABLE 2 Tensile RequirementsGrade B Grade CTensile strength, min, ksi (MPa) 60 (415) 70 (485)Yield strength, min, ksi (MPa) 35 (240) 40 (275)Elongation in 2.0 in. or 50 mm, min, % 20.0 18.0Elongation in 8.0 in. or 200 mm,min, %A17.0 15.0AApplicable to bars 112 in. (38 mm) in diame
28、ter tested full size.A696 90a (2012)2SUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall be applied only when specified bythe purchaser in the inquiry, contract, or order. Details of these supplementary requirements shall beagreed upon in writing by the manufactur
29、er and purchaser. Supplementary requirements shall in noway negate any requirement of the specification itself.S1. Special StraightnessS1.1 Bars shall be within the tolerances for special straight-ness.S2. Stress Relief AnnealS2.1 Bars shall be stress relief annealed (may be specifiedfor bars that h
30、ave been ordered to special straightness toler-ance).S3. Surface QualityS3.1 Bars shall be produced to special surface qualityrequirements which shall be negotiated between the purchaserand the supplier.S4. Special Internal SoundnessS4.1 Bars shall be produced with special internal soundnessto be ve
31、rified by one or more macro-etch samples. Acceptancelimits shall be negotiated between the purchaser and the seller.S5. Fine Grain PracticeS5.1 The steel shall conform to the fine austenitic grain sizerequirement of Specification A29/A29M.S6. Restricted Size Tolerances for Hot-Wrought BarsS6.1 Bars
32、shall be furnished with tolerances on dimensionsmore restrictive than specified in Specification A29/A29M.Tolerance requirements to apply shall be negotiated betweenthe purchaser and the manufacturer.S7. DescalingS7.1 Bars shall be furnished descaled and oiled.ASTM International takes no position re
33、specting 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
34、 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 Inter
35、national 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 b
36、elow.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 website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A696 90a (2012)3
