ASTM A959-2019 pdf free download

ASTM A959-2019 pdf free download.Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
1. Scope
1.1 This guide provides a guide to ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 for specifying chemical composition limits of wrought stainless steels. It is intended that these recommended grade composition limits be 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 composition from Test Methods, Practices, and Ter- minology A751. 1.3 All stainless steel UNS numbers and the stainless steel grades in all standards overseen by the aforementioned ASTM subcommittees have been included, except those grades appli- cable to restricted special end uses and alloys containing less than 10.5 % minimum chromium. 1.4 Not addressed are minor composition modifications which a specific product subcommittee may find necessary to accommodate effects of normal processing or to enhance fabricability by the producer or user, or both. 1.5 Also not generally addressed (except when established by ASTM product subcommittees) is a complete rationalization of all limits, especially when such would confict with long- standing practices and is not justified by special technical effect. 1.6 Excluded from this guide are cast material and welding filler metal. 1.7 This international standard was developed in accor- dance with intrnationally recognized principles on standard- ization established in the Decision on Principles for the . Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions of Terms Specific to This Standard: 3.1.1 austenitic grade, n- -metallurgical term meaning that the material is usually predominantly face-centered cubic in structure and hardenable only by cold working. 3.1.2 austenitic-ferritic (duplex) grade, n- -metallurgical . term meaning that the material is a mixture of austenitic and ferritic structures, with at least one-fourth of the lesser phase, and hardenable only by cold working. 3.1.3 ferritic grade, n- -metallurgical term meaning that the material is body-centered cubic in structure (with lttle, if any, tempered martensite) and hardenable only slightly by cold working (responding little or only slightly to conventional heat treatment by quenching and tempering). 3.1.4 martensitic grade, n- -metallurgical term meaning that the material is capable of being produced in a distorted body-centered cubic structure by conventional heat treating and quenching, and that the quenched structure is capable of conventional tempering. Martensitic grades are delivered in the annealed (ferritic) condition or the hardened and tempered (martensitic) condition. 3.1.5 precipitation hardening grade, n- -metallurgical term meaning that the material may be basically austenitic or martensitic in structure and hardenable by precipitation hard- ening (sometimes called age hardening). 3.1.6 standard stainless steel grade, n- listed chemical composition associated with a stainless steel grade identified by a particular UNS number appearing in SAE publication HS-1086，except as modified by an ASTM subcommittee having oversight of a wrought stainless steel product where such a modification is justified by a specific technical effect.
4. Significance and Use
4.1 It is anticipated that the ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 will use the standard composition limits listed in this guide for the grades identified by the corresponding UNS designation in the product specifi- cation unless there is a specific technical justification for doing otherwise. The compositions in this guide shall not be consid- ered as chemical requirements for any particular product until adopted by the subcommittee overseeing that product. 4.2 Assuming that uniform compositions among the many product standards for stainless steel are desirable, the compo- sition limits provided in this standard are to be used as guides in determining limits for each of the elements included in the total composition of each grade. The composition limits have been established with the intent that each product subcommit- tee will find it necessary to require only a minimum number of changes to reflect specific technical effects. Section 5 lists the general guidelines followed for determining the limits for each element; the limits established in this guide are based on these guidelines.