ASTM A790-17(R2017) pdf free download

ASTM A790-17(R2017) pdf free download.Standard Speci fication for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
1. Scope
1.1 This specification covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corro- sive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittle- ment if used for prolonged periods at elevated temperatures. 1.2 Optional supplementary requirements are provided for pipe when 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 welded and seamless stainless steel pipe as shown in ANSI B36.19. 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. Within the text, the SI units are shown in brackets. 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. 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.
6. Materials and Manufacture
6.1 Manufacture: 6.1.1 The pipe shall be made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation. 6.1.2 At the manufacturer’s option, pipe may be either hot-finished or cold-finished. 6.1.3 The pipe shall be pickled free of scale. When bright annealing is used, pickling is not necessary. 6.2 Discard—A sufficient discard shall be made from each ingot to secure freedom from injurious piping and undue segregation. 6.3 Unless otherwise stated in the order, all pipe shall be furnished in the heat-treated condition as shown in Table 1. 6.3.1 For seamless pipe, as an alternate to final heat treat- ment in a continuous furnace or batch-type furnace, immedi- ately following hot forming while the temperature of the pipes is not less than the specified minimum solution treatment temperature, pipes shall be individually quenched in water or rapidly cooled by other means, except for UNS S32950, which shall be air cooled. 6.3.2 If the purchaser desires pipe without heat treatment subsequent to welding, the purchase order shall specify the following condition: 6.3.2.1 No final heat treatment of pipe fabricated from plate that has been heat treated as required by Table 1 for the particular grade is required, provided a sample of that heat of finished pipe or material representative of that heat of pipe as a prolongation of the weld passes the Test Methods A923 Method B or C (See Note 2), including base metal, weld metal, and heat affected zone per heat. Each pipe supplied under this requirement shall be stenciled with the suffix “HT-O.” 6.3.2.2 For materials not listed in Table 3 of Test Methods A923, the HT-O provision does not apply. N OTE 2—The Test Methods A923 test method (B or C) is at the manufacturer’s option, unless otherwise specified by the purchaser.