ASTM A995-2020 pdf free download
ASTM A995-2020 pdf free download.Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts
1. Scope
1.1 This specification covers austenitic-ferritic (duplex) stainless steel castings for valves, flanges, fittings, and other pressure-containing parts. 1.2 The duplex stainless steels offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated. Ferrite levels are not specified, but these grades will develop a range of approximately 30 to 60 % ferrite with the balance austenite. It is the responsibility of the purchaser to determine which grade shall be furnished depending on design and service conditions, mechanical properties， and corrosion- resistant characteristics. NOTE 1- -Because of the possibility of precipitation of embitling phases, the grades included in this specification are not recommended for service at temperatures above 600 °F [315 °C]. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.4 This international standard was developed in accor- dance with internationally 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.
2. Referenced Documents
2.1 ASTM Standards:2A488/A488M Practice for Steel Castings, Welding, Qualf- cations of Procedures and Personnel A703/A703M Specification for Steel Castings, General Requirements, for Pressure-Containing Parts E125 Reference Photographs for Magnetic Particle Indica- tions on Ferrous Castings E165/E165M Practice for Liquid Penetrant Testing for Gen- eral Industry E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count G48 Test Methods for Pitting and Crevice Corrosion Resis- tance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
3. Terminology
3.1 Definitions of Terms Specific to This Standard: 3.1.1 duplex stainless steel- -an iron-chromium-nickel- molybdenum alloy that, when properly heat treated, consists of approximately 30 to 60 % ferrite with the balance austenite.
4. General Conditions for Delivery
4.1 Material furnished to this specification shall conform to the applicable requirements of Specification A703/A703M, including the supplementary requirements that are indicated on the purchaser order. Failure to comply with the general requirements of Specification A703/A703M constitutes non- conformance with this specification. In case of confict be- tween the requirements of this specification and Specification A703/A703M, this specification shall prevail.
5. Ordering Information
5.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this specification. Such requirements may include, but are not limited to, the following:5.1.1 A description of the casting by pattern number or drawing (dimensional tolerances shall be included on the casting drawing), 5.1.2 Quantity (weight and number of castings), 5.1.3 Specification designation and date of issue, 5.1.4 Grade of steel, 5.1.5 Supplementary requirements including acceptance criteria, and S10.1 Liquid penetrant examination of cavities prepared for welding shall be performed to verify removal of those discon- tinuities found unacceptable by the inspection method specified for the casting. The method of performing liquid penetrant examination shall be in accordance with Practice E165/ E165M. Unless other degrees of shrinkage or types of discon- tinuities found in the cavities are specified, Type II, Internal Shrinkage, of Reference Photographs E125, of Degree 2 in sections up to 2 in. [50 mm] thick, and of Degree 3 in sections over 2 in. [50 mm] thick shall be acceptable.
