Home>ASTM Standards>ASTM A949-01(R2019) pdf free download

ASTM A949-01(R2019) pdf free download

ASTM A949-01(R2019) pdf free download.Standard Specification for Spray-Formed Seamless Ferritic/Austenitic Stainless Steel Pipe
1. Scope
1.1 This specification covers spray-formed seamless ferritic/ austenitic stainless steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corro- sion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. 1.2 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and when desired, one or more of these may be specified in the order. 1.3 Appendix X1 of this specification lists the dimensions of seamless stainless steel pipe as shown in ANSI B 36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification. 1.4 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 non-conformance with the standard. 1.4.1 Within the text, the SI units are shown in brackets. 1.4.2 The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. N OTE 1—The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.” 1.5 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.
3. Terminology
3.1 Definitions: 3.1.1 For definitions of terms used in this specification, refer to Terminology A941. 3.2 Definitions of Terms Specific to This Standard: 3.2.1 spray-formed—denotes the fabrication of different shapes of a metallic material by deposition of a spray, consisting of droplets, solid particles, and particles that are partially solid, onto a moving substrate. Discussion—The spray is produced by gas atomiza- tion of the liquid metal or alloy. On impingement with the substrate, the species of the spray consolidate and solidify completely to produce a product that is essentially free of porosity. The metallurgical characteristics of the spray-formed product are controlled primarily by the thermal condition of the spray, and that of the surface of the metallic deposit formed on the substrate.
12. Mechanical Tests Required
12.1 Transverse or Longitudinal Tension Test—One tension test shall be made on a specimen for lots of not more than 100 pipes. Tension tests shall be made on specimens from two pipes for lots of more than 100 pipes. N OTE 3—The term “lot,” for mechanical tests, applies to all pipe of the same nominal size and wall thickness (or schedule) that is produced from the same heat of steel and subjected to the same finishing treatment: (1) in a continuous heat-treatment furnace, or (2) in a batch-type heat-treatment furnace, equipped with recording pyrometers and automatically controlled within a 50°F [30°C] range, the larger of: (a) each 200 ft [60 m] or fraction thereof or, (b) that pipe heat treated in the same batch furnace charge.12.2 Flattening Test- For material heat treated in a batch- type furnace, flattening tests shall be made on 5 % of the pipe from each heat-treated lot. For material heat treated by the continuous process, this test shall be made on a sufficient number of pipes to constitute 5 % of the lot, but in no case less than two lengths of pipe. 12.3 Hydrostatic Test- Each length of finished pipe shall be subjected to the hydrostatic test. 12.3.1 The hydrostatic test shall be in accordance with Specifcation A999/A999M. When making the calculations in the Hydrostatic Test Requirements Section of Specification A999/A999M, an S value 50 % of the specified minimum yield strength shall be used. 12.3.2 When specified by the purchaser, a nondestructive electric test in accordance with Specification A450/A450M may be used instead of, or in addition to, the hydrostatic test.

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