1、Designation: A696 90a (Reapproved 2012)A696 17Standard 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 ofori
2、ginal adoption 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 U.S. Department
3、 of Defense.1. Scope Scope*1.1 This specification2 covers hot-wrought and cold-finished special quality carbon steel bars, in straight lengths only, subjectto mechanical property requirements and intended for use in manufacturing components for pressure piping and otherpressure-containing applicatio
4、ns.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.3 This international standard was developed in accordance with internationally
5、 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) Committee.2. Referenced Documents2.1 ASTM Standards:3A29/A29M Specific
6、ation for General Requirements for Steel Bars, Carbon and Alloy, Hot-WroughtA370 Test Methods and Definitions for Mechanical Testing of 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 00
7、0 psi (240 MPa), minimum.3.1.2 Grade CTensile strength 70 000 psi (485 MPa), minimum; yield strength 40 000 psi (275 MPa), minimum.3.2 The bars are intended for machining, welding, hot forming, and threading by machining or cold rolling.4. Ordering Information4.1 Orders for material under this speci
8、fication should include the following information: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) (9.18.1),4.1.5 Dimensions (diameter, thickness, width, and length
9、),4.1.6 Cross section (round, square, hexagon),4.1.7 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 supplementary requirements, if required.1 This specification is under the jurisdiction ofASTM Committee A01 on Steel,
10、Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.15on Bars.Current edition approved March 1, 2012Nov. 1, 2017. Published April 2012December 2017. Originally approved in 1974. Last previous edition approved in 20062012as A696 90a (2012). (2006). DOI: 10.1520/A069
11、6-90AR12.10.1520/A0696-17.2 For ASME Boiler and Pressure Vessel Code Applications, see related Specification SA-696 in Section II of that Code.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvol
12、ume 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 standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adeq
13、uately 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 is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM
14、International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1NOTE 1Atypical ordering description is as follows: 10 000 lb, Carbon Steel Bars, Hot Wrought, Descaled, 1.000-in. diameter by 10 ft, Round,ASTMA696 dated _, Grade B; Supplementary Requirement S1 Straig
15、htness 0.125 in. in any 5 ft.5. Materials and Manufacture5.1 Melting PracticeThe steel shallmay be made by one or more of the following primary processes: open-hearth,basic-oxygen, or electric-furnace. produced by any commercially viable primary steelmaking process. The primary melting mayincorporat
16、e separate degassing or refining, and may be followed by secondary melting using electroslag remelting or vacuum arcremelting. Where secondary melting is employed, the heat shall be defined as all of the ingots remelted from a single primary heat.5.2 DeoxidationThe steel shall be fully killed.5.3 Qu
17、alityThe bars shall be special quality.5.4 Hot or Cold Working:5.4.1 The bars shall be hot wrought or cold finished as specified by the purchaser.5.4.2 Cold-finished bars reduced in cross-sectional area more than 10 % by cold drawing or rolling shall be heat treated asspecified in 5.5.2.5.5 Heat Tre
18、atment:5.5.1 Except as provided in 5.5.2, the bars shall be furnished as-hot wrought or as-cold finished.5.5.2 Cold-finished bars cold worked in excess of 10 % (see 5.4.2) shall be stress relief annealed at not less than 1200F(649C),1200 F (649 C), normalized, or fully annealed. The specific heat tr
19、eatment shall be at the option of the manufacturer.6. Chemical Composition6.1 The heat analysis shall conform to the requirements for chemical composition specified in Table 1.6.2 A product analysis of the steel may be made by the purchaser and shall conform to the requirements of Table 1 subject to
20、the product analysis tolerances specified in Specification A29/A29M.7. Tensile Requirements7.1 Requirements: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 specified in Table
21、2 of 1.0 % shall be made for each 1.0 in. (25.4 mm) ofspecified diameter over 2.0 in. (51 mm) or fraction thereof to a maximum of 3 %.7.2 Specimens:7.2.1 Tension test specimens shall be taken longitudinally from a position midway between the center and the surface of the baror as close as practical
22、to this location for small sizes.7.2.2 When it is impractical to remove specimens in accordance with 7.2.1, they shall be taken in accordance with Test Methodsand Definitions A370.TABLE 1 Chemical Requirements (Heat Analysis), %Grades B and CCarbon, maxA 0.32Manganese, max 1.04Phosphorus, max 0.035B
23、Sulfur, max 0.045BSilicon 0.15 to 0.35Lead BA For each reduction of 0.01 % below the specified carbon maximum, an increaseof 0.06 % manganese above the specified maximum will be permitted up to amaximum of 1.35 %.B Phosphorus, sulfur, or lead, or a combination thereof, shall not be added.TABLE 2 Ten
24、sile 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 15.0A Applicable to bars 112 in. (38 mm) in diameter tested full size.A696 172
25、7.3 Number of TestsOne tension test shall be made from each lot. A lot shall consist of all bars of one size from one heatprocessed at one time and subjected to the same heat treatment when heat treated.7.4 Test MethodsTension tests shall be made in accordance with Test Methods and Definitions A370.
26、 The yield strength shallbe determined by the 0.2 % offset or 0.5 % extension under load methods.8. Workmanship, Finish, and Appearance8.1 DescalingWhen descaled bars are required, Supplementary Requirement S7 must be specified.8.2 The bars shall be free of visible pipe and conditioned as necessary
27、to remove injurious surface imperfections.9. General Requirements9.1 Material furnished under this specification shall conform to the applicable requirements of the current edition ofSpecification A29/A29M unless otherwise provided herein.10. Certification and Test Reports10.1 Amanufacturers certifi
28、cation that the material was manufactured and tested in accordance with this specification togetherwith a report of the heat analysis and tension test results shall be furnished at the time of shipment. The report shall include thename of the manufacturer, ASTM designation number and grade, shape, s
29、ize, and finish.11. Packaging and Package Marking11.1 Bars less than 2.0 in. (51 mm) in diameter or thickness shall be tightly banded with a sufficient number of bands of adequatestrength to minimize bundle breakage during handling and shipping. Larger sizes shall be packaged in accordance withSpeci
30、fication A29/A29M.11.2 For bars less than 2.0 in. (51 mm) in diameter or thickness, each bundle shall bear a weather-resistant tag showing thepurchase order number, ASTM designation number and grade, heat number, size, and name of manufacturer.11.3 Bars 2.0 in. (51 mm) and larger in diameter or thic
31、kness shall have the heat number steel stamped on one end.12. Keywords12.1 pressure piping components; special quality steel bars; steel barsSUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall be applied only when specified bythe purchaser in the inquiry, contract
32、, or order. Details of these supplementary requirements shall beagreed upon in writing by the manufacturer 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
33、ness.S2. Stress Relief AnnealS2.1 Bars shall be stress relief annealed (may be specified for bars that have been ordered to special straightness tolerance).S3. Surface QualityS3.1 Bars shall be produced to special surface quality requirements which shall be negotiated between the purchaser and thesu
34、pplier.S4. Special Internal SoundnessS4.1 Bars shall be produced with special internal soundness to be verified by one or more macro-etch samples. Acceptancelimits shall be negotiated between the purchaser and the seller.A696 173S5. Fine Grain PracticeS5.1 The steel shall conform to the fine austeni
35、tic grain size requirement of Specification A29/A29M.S6. Restricted Size Tolerances for Hot-Wrought BarsS6.1 Bars shall be furnished with tolerances on dimensions more restrictive than specified in Specification A29/A29M.Tolerance requirements to apply shall be negotiated between the purchaser and t
36、he manufacturer.S7. DescalingS7.1 Bars shall be furnished descaled and oiled.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A69690a(2012) that may impact the use of this standard. (Approved Nov. 1, 2017.)(1) Revised first sentenc
37、e of 5.1.ASTM 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 ri
38、ghts, 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
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