1、Designation:A57596(Reapproved 2013)1Standard Specification forSteel Bars,Carbon,Merchant Quality,M-Grades1This standard is issued under the fixed designation A575;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revis
2、ion.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.1NOTESections 1.4 and 4.1 were editorially corrected in July 20
3、13.1.Scope1.1 This specification covers hot-wrought 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 th
4、eproduction of noncritical parts.Moderate cold 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 A576.1.3 Some end uses may require one or more of the availabledesig
5、nations shown under Supplementary Requirements.1.4 The values stated 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 Standard
6、s:2A29/A29M Specification for Steel Bars,Carbon and Alloy,Hot-Wrought,General Requirements forA576 Specification for Steel Bars,Carbon,Hot-Wrought,Special Quality3.Ordering Information3.1 Orders under this specification should include the fol-lowing as required to describe adequately the desired mat
7、erial: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 Supplementary Requirements or additions,if required,3.1.4 Dimensions and quantity,and3.1.5 End use and processing.4.Materials and Manufactu
8、re4.1 The steel shall be made by the basic-oxygen or electric-furnace process.5.Conditions5.1 Merchant quality bars are available in rounds,squares,round 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
9、 steel bars are producedin cut lengths and coils;the producer should be consultedregarding sections and sizes available in coils.5.2 Merchant quality is available within a composition of0.50%maximum carbon,0.60%maximum manganese,nonresulfurized,non-leaded.The phosphorus content is0.04%,max,and the s
10、ulfur content is 0.05%,max.Merchantquality grades of steel are shown in Table 1 and chemicalranges and limits in Table 2;the grade numbers are designatedwith the prefix“M.”Merchant quality bars are not produced toany specified silicon content,grain size,or other requirementthat would influence the t
11、ype of steel.5.3 Merchant quality bars shall be free of visible pipe;however,they may contain pronounced chemical segregation.Internal porosity,surface seams,and other surface irregularitiesmay be present in this quality.6.Chemical Composition6.1 The steel shall conform on heat analysis to the requi
12、re-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 thepurchaser for the elements specified.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless S
13、teel and Related Alloys and is the direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved April 1,2013.Published July 2013.Originallyapproved in 1967.Last previous edition approved in 2007 as A575 96(2007).DOI:10.1520/A0575-96R13E01.2For referenced ASTM standards,visit the ASTM
14、 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7
15、.General Requirements7.1 Material furnished under this specification shall con-form to the requirements of the current edition of SpecificationA29/A29M.SUPPLEMENTARY REQUIREMENTSOne or more of the following supplementary requirements shall apply when specified by thepurchaser.S1.Special Straightness
16、S1.1 Bars may be specified to special straightness tolerance(see Specification A29/A29M).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 bars thathave been descaled.TABLE 1 Grade Designations and Chemical Compositions of Hot-Wrought Merchant Quality M Series Carbon Steel BarsGradeDesignationCarbon,%Manganese,A%Phosphorus,max,%Sulfur,max,%M 10080.10 max0.250.600.040.05M 10100.070.14