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Introduction of SA-213T92 Steel tube for pressure vessel
Source:Xinsteel   Date:2020-05-11
T92 (NF616): Based on T91, Nippon Steel of Japan has further improved and improved the composition, adopted compound-multiple strengthening methods, appropriately reduced the Mo content to 0.30-0.60%, added 1.50-2.00% of W and formed W-Mo composite solid solution strengthening with W as the main, adding N to form interstitial solid solution strengthening, adding V, Nb and N to form carbonitride dispersion precipitation strengthening and adding a small amount of B (0.001-0.006%) to form the B grain boundary Strengthen, so as to develop a new type of ferritic heat-resistant alloy steel. This steel is called NF616 in Japan; it is now included in the ASME SA-213 standard.
    Like T91, T92 has better thermal expansion coefficient and thermal conductivity than austenitic steel. It has excellent endurance strength, high allowable stress, good toughness and weldability. The endurance strength {permissible stress} is higher than T91, and the endurance strength {permissible stress} at 650 ℃ is 1.6 times that of T91; and it has good steam oxidation resistance and welding performance, which is basically the same as T91.
    T92 steel pipe has excellent performance, and the service temperature can reach 650 ℃. It can partially replace TP304H and TP347H austenitic stainless steel tubes, and manufacture sub-critical, supercritical and even super-supercritical power plant boilers with metal wall temperature not exceeding 650 ℃, such as high-temperature superheater and reheater tube pressure parts, avoid or reduce Dissimilar steel joints to improve the running performance of steel pipes. It can also be used as steel for pressure vessels and high-temperature pressure parts of nuclear power. The steel will be widely used in the future, the highest temperature zone of existing boilers, and the steel for supercritical pressure boiler tubes.