ASTM-A790/A790M:2020 pdf free download – Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe.
4.1.7 End finish (section on ends of Specification A999/ A999M),
4.1.8 Optional requirements (product analysis, Section 9; hydrostatic test or nondestructive electric test, Section l4),
4.1.9 Test report required (section on certification of Specification A999/A999M),
4.1.10 Specification designation, and
4.1.11 Special requirements and any supplementary requirements selected.
5. General Requirements
5.1 Matcrial furnishcd undcr this specification shall conform to the applicable requirements of the current edition of Specification A999/A999M unless otherwise provided herein.
6. Materials and Manufacture
6. 1 Manufticture.
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 treatment in a continuous furnace or batch-type furnace, immediately following hot forming while the temperature of the pipes is not less thaii the specified minimum solution treatment temperature, pipes shall he 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 liecit of finished pipe or material representative of that heat of pipe as a prolongation of the 31eld USSCS 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.
Noit 2—The Test Methods A923 test method (13 or C) is at the manufacturer’s option. unless otherwise specified by the purchaser.
7. Cheniical Composition
7.1 The steel shall conform to the chemical requirements as prescribed in Table 2.
12. Workmanship, Finish, and Appearance
12.1 The finished pipes shall be reasonably straight and shall have a workmanlike finish. Imperfections may be re-
moved by grinding, provided the wall thicknesses are not decreased to less than that permitted, in the Permissible
Variations in Wall Thickness Section of Specification A999/A999M.