Minerals & Metallurgy

This specification2 covers seamless, straight-seam?welded, and heavily cold worked welded austenitic stainless?steel pipe intended for high-temperature and general corrosive?service. NOTE 1—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 temperatures 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 temperatures are lower?than ?50°F [?45°C]. 1.2 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. 1.3 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. 1.4 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