ASTM A959-19 pdf free.Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels.
1.1 This guide piosides a guide to ASTM Subcommittees A01.06,A0l.l0, A01.17, AO1.22, and AOl.28 for specifying chemical composition limits of wrought stainless steels. It is intended that these recommended grade composition hmiLs he suitable for adoption by other standardization bodies that prepare standards for stainless steel products.
1.2 included in this guide are the recommendations for determining the number of significant figures for specifying chemical conipositian from Test Methods. Practices, and icr. minology A75I.
1.3 All stainless steel tiNS numbers and the stainless steel grades in all standani’. oserseen by the aforementioned ASTM subcommittees have been included. escept those grades applicable to restricted special end uses and alloys containing less than 10.5% minimum chromium.
1.4 Not addressed are minor composition modification’. shich a specifIc product subcommittee may find necessary to accommodate cfTccts of normal processing or to enhance fatwicahility by the producer or user, or both.
1.5 Also not generally addressed (except when established by ASTM product subcommitlecs) is a complete rationalitation ci all limits, especially when such would conflict with long. standing practices and is not justified by special technical cltcct.
1.6 Escluded Irtim this guide are cast material and welding tiller metal.
2.1Definitionsof Term; Specific to Thii Standard:
2.1.1 uuitenslw grade. n-metallurgical term Inclining that the material is u%uauly predominantly face-ientered cubic in structure and hardenable only by cold working.
3.1.2 uus:enittc-ferniic tdupIex grade, n—metallurgical term meaning that the material is a mixture of austenitic and fcrntic structures, with at least me-Iourth of the lesser phase. and hanknahlc only by cold working.
3.1.3 frrrith’ grade. n metallurgical term meaning that the material is body-centered cubic in structure (with little, if any. tempered manensite and hardenable only slightly by cold working (responding little or only slight)) to consentional heal treatment by quenching and tcmpering
3.1.4 marvenitk g,mk. n—metallurgical term meaning that the material is capable of being produced in a dishwled body-centered cubic structure by conscniional hea treating and quenching. and that the quenched structure is capable of conventional tempering. Martensitic grades are deliered in the annealed (ferritic) condition or the Iwdened and tempered (martensitic) condition.
3.1.5 precipitation hardening grade, n- metallurgical term meaning that the material may be basically austenitic or martcnsmc in structure and hardenable by precipitation hardcmng somctimes called age hardening).
3.1.6 standard ,ainIesi ueel grade. n—listed chemical composition iass4xiaied ith a stainless steel grade identified by a particular UNS number appearing in SAL uhI,caikm HS-IO)tts. escepi as modified by an ASTM subcommittee ha.ng osersight of a wraugb stainless sleet product where such a imiditIcation is justified by a specific technical effect.
4. Significance and Use
4.1 It is anticipated that the ASThI Subcommittees AOl (Wi. AOl.IO. Mill?, AOI.22. and AOl2t4 wilt usc the standard composition limits listed in this guide for the grades idernified by the corresponding (iNS designation in the product specification unless there is a specific technical justificahon lot doing otherwise. The conipositions in this guide shall not be unsidered as chemical requirements for any pariicubr product until adopted by the subcommittee os ersccing that product.
4.2 Assuming thai uniform compositions among the many product standards lot stainless steel are desirable. the composition limits pnvblded in this standard are to be used as guides in dctennining limits for each of the elements included in the total comnposition o4 each grade. The composition limits base been established with the intent that each product subcommittee will find it neces.sa’y to require only a minimum number of changes to reflect specitic technical effects. Sechon S lists the general guidelines followed for determining the limits for each element: the limits esiaNished in this guide are based on these guidel ines
4.3 Not included in this standard stainless steel grade harmonitation effort is an attempt to unify stainless steel compositions in ASTM product standards by any means other than recogniring current industry practices.ASTM A959 pdf download.