This is issued under the fixed designation ASTM A312; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. This covers seamless, straight-seam and heavily cold worked welded austenitic stainless steel pipe for high-temperature and general corrosive service.

When the impact test criterion for a low-temperature service would be 15 ft·lbf [20 J] energy absorption or 15 mils [0.38 mm] lateral expansion, some of the austenitic stainless steel grades covered by this specification are accepted by certain pressure vessel or piping codes without the necessity of making the actual test. For example, Grades TP304, TP304L, and TP347 are accepted by the ASME Pressure Vessel Code, Section VIII Division 1, and by the Chemical Plant and Refinery Piping Code, ANSI B31.3, for service at temperatures as low as −425 °F [−250 °C] without qualification by impact tests.

Other AISI stainless steel grades are usually accepted for service temperature as low as −325 °F [−200 °C] without impact testing. Impact testing may, under certain circumstances, be required. For example, materials with chromium or nickel content outside the AISI ranges, and for material with carbon content exceeding 0.10 %, are required to be impact tested under the rules of ASME Section VIII Division 1 when service temperature are lower than −50 °F [−45 °C].



Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important.

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, it is permitted to specify in the order one or more of these supplementary requirements.

Table X1.1 lists the standardized dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions is permitted to be ordered

Nominal Pipe Size (NPS): 1/8, 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2, 2, 21/2 inch
Outside Diameter: 10,3 - 73 mm (0,405 - 2,875 inch)
Wall Thickness: 1,73 - 7,01 (0,068 - 0,276 inch)

Notes:
Steel Grades - TP 304, TP 304L, TP 316, TP 321

1. Size of pipes in accordance with ANSI/ASME B36. 19M.
   
2. All technical requirements in accordance with ASTM A530.
   
3. Length tolerance of measured pipes is not greater than +10 mm.
   
4. The quality of pipes is ensured by manufacturing process and non-destructive test.
   
5. Intergranular corrosion test in accordance with ASTM A262, Practice E is available.