1、Designation: A 575 96 (Reapproved 2007)Standard Specification forSteel Bars, Carbon, Merchant Quality, M-Grades1This standard is issued under the fixed designation A 575; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 This specification covers hot-wrough
3、t merchant qualitycarbon steel bars produced to a chemical composition. Mer-chant quality bars are used for structural and similar miscella-neous bar applications involving moderate cold bending, mod-erate hot forming, punching, and welding as used in theproduction of noncritical parts. Moderate col
4、d bending in-volves a generous bend radius with the axis of the bendtransverse to the direction of rolling.1.2 Special quality hot-wrought carbon steel bars are cov-ered in Specification A 576.1.3 Some end uses may require one or more of the availabledesignations shown under Supplementary Requiremen
5、ts.1.4 The values stated in inch-pound units are to be regardedas the standard.2. Referenced Documents2.1 ASTM Standards:2A 29/A 29M Specification for Steel Bars, Carbon andAlloy,Hot-Wrought, General Requirements forA 576 Specification for Steel Bars, Carbon, Hot-Wrought,Special Quality3. Ordering I
6、nformation3.1 Orders under this specification should include the fol-lowing as required to describe adequately the desired material:3.1.1 ASTM specification number and date of issue,3.1.2 Grade designation or chemical composition (Section 7and appropriate chemical analysis tables),3.1.3 Supplementar
7、y Requirements or additions, if required,3.1.4 Dimensions and quantity, and3.1.5 End use and processing.4. Materials and Manufacture4.1 The steel shall be made by the open-hearth, basic-oxygen, or electric-furnace process.5. Conditions5.1 Merchant quality bars are available in rounds, squares,round
8、cornered squares, hexagons, and bar size shapes under 3in. (76.2 mm), and in flats less than 40.8 lb/ft (60.7 kg/m).Hot-wrought merchant quality carbon steel bars are producedin cut lengths and coils; the producer should be consultedregarding sections and sizes available in coils.5.2 Merchant qualit
9、y is available within a composition of0.50 % maximum carbon, 0.60 % maximum manganese, non-resulfurized, non-leaded. The phosphorus content is 0.04 %,max, and the sulfur content is 0.05 %, max. Merchant qualitygrades of steel are shown in Table 1 and chemical ranges andlimits in Table 2; the grade n
10、umbers are designated with theprefix “M.” Merchant quality bars are not produced to anyspecified silicon content, grain size, or other requirement thatwould influence the type of steel.5.3 Merchant quality bars shall be free of visible pipe;however, they may contain pronounced chemical segregation.1
11、This 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 Sept. 1, 2007. Published January 2008. Originallyapproved in 1967. Last previous edition approved in
12、2002 as A 575 96 (2002).2For referenced ASTM standards, visit the ASTM 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.TABLE 1 Grade Designations and Chemic
13、al Compositions ofHot-Wrought Merchant Quality M Series Carbon Steel BarsGradeDesignationCarbon,%Manganese,A%Phosphorus,max,%Sulfur,max, %M 1008 0.10 max 0.250.60 0.04 0.05M 1010 0.070.14 0.250.60 0.04 0.05M 1012 0.090.16 0.250.60 0.04 0.05M 1015 0.120.19 0.250.60 0.04 0.05M 1017 0.140.21 0.250.60 0
14、.04 0.05M 1020 0.170.24 0.250.60 0.04 0.05M 1023 0.190.27 0.250.60 0.04 0.05M 1025 0.200.30 0.250.60 0.04 0.05M 1031 0.260.36 0.250.60 0.04 0.05M 1044 0.400.50 0.250.60 0.04 0.05AUnless prohibited by the purchaser, the manganese content shall be permittedto exceed 0.60 % on heat analysis to a maximu
15、m of 0.75 %, provided that thecarbon range on heat analysis has the minimum reduced by 0.01 % for each0.05 % manganese over 0.60 %.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Internal porosity, surface seams, and other surface ir
16、regularitiesmay be present in this quality.6. Chemical Composition6.1 The steel shall conform on heat analysis to the require-ments of chemical composition in Table 1, or chemicalcompositions can be specified that conform to the ranges andlimits in Table 2. The heat analysis shall be reported to the
17、purchaser for the elements specified.7. General Requirements7.1 Material furnished under this specification shall con-form to the requirements of the current edition of SpecificationA 29/A 29M.SUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall apply when specifie
18、d by thepurchaser.S1. Special StraightnessS1.1 Bars may be specified to special straightness tolerance(see Specification A 29/A 29M).S2. CleaningS2.1 The purchaser may specify that the surface of bars bedescaled by pickling or blast cleaning.S3. CoatingS3.1 The purchaser may specify oil coating on b
19、ars thathave been descaled.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 infri
20、ngement of such rights, 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 standar
21、d or for additional standardsand should be addressed to ASTM International 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 view
22、s 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 multiple copies) of this standard may be obtained by contactin
23、g 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).TABLE 2 Heat Chemical Ranges and Limits of Hot-Wrought Merchant Quality M Series Carbon Steel BarsElement Chemical Ranges and Limits, %When Maximum ofSpec
24、ified Element is:Range LowestMaximumCarbon . . 0.10To 0.12 incl . .Over 0.12 to 0.24 incl 0.07 .Over 0.24 to 0.27 incl 0.08 .Over 0.27 to 0.50 incl 0.10 . . 0.35ManganeseATo 0.60 incl 0.35 . .Phosphorus To 0.04 incl . 0.04Sulfur To 0.05 incl . 0.05Copper When copper is required0.20 minimum isgenerally specified. .AUnless prohibited by the purchaser, the manganese content may exceed 0.60 % on heat analysis to a maximum of 0.75 %, provided that the carbon range on heatanalysis has the minimum and maximum reduced by 0.01 % for each 0.05 % manganese over 0.60 %.A 575 96 (2007)2
