t91 steel, Katherine source steel (certified), Matsubara t91 provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) is specialized in "Q345b seamless steel pipe, 35crmo seamless steel pipe, 42crmo seamless" enterprise, the company of "honesty, hard service" concept, for you provide the highest quality products and services. Welcome to inquire! Contact: Manager Wu. Company annual sales of various major steel production of Chengdu Iron and Steel Group, Daye Steel Group, Baotou Steel, Baosteel Group, Anshan Iron and Steel Group, Tianjin Seamless, Xining Te steel, Wuxi Steel, Hengyang Steel and other seamless steel pipe and alloy pipe. Main Material: 20 #, 35 #, 45 #, 20G, 20A, 40Mn2,45Mn2,27SiMn, 40MnB, 20MnVB, 20Cr, 30Cr, 35Cr, 40Cr, 45Cr, 50Cr, 38CrSi, 12CrMo, 20CrMo, 35CrMo, 42CrMo, 12CrMoV , 12Cr1MoV, 38CrMoAL, 50CrV, 20CrMnSi, 30CrMnSi, 35CrMnSi, 20CrMnTi, 30CrMnTi, 12CrNi2, 12CrNi3,12Cr2Ni4,40CrNiMoA, 45CrNiMoVA, 20G, 20MnG, 25MnG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 12Cr3MoVSiTiB such as the implementation of standards: GB / T8162-99 structure tube, GB / T8163-99 fluid pipe, GB / T3087-99 low pressure boiler tubes, GB / T5310-95 high-pressure boiler tubes, GB / T6479-2000 fertilizer tube, 27SiMn hydraulic support, high alloy pipe , GB / T9948-85 oil cracking pipe GB9948-88, geological drilling pipe YB235-70, automobile axle casing YB / T5035-96. T91 steel by alloying principle, especially adding a small amount of niobium, vanadium and other trace elements Imported t91, high temperature strength, oxidation resistance compared with 12 Cr1MoV steel has greatly improved, but its welding performance is poor. Bolt tests showed, T91 steel has a greater tendency to cold cracking, select preheated 200 ~ 250 ℃ t91 steel, interpass temperature 200 ~ 300 ℃, which can effectively prevent cold cracks. T91 weld heat treatment of Island before t91, must be cooled to 100 ~ 150 ℃, holding 1 h; tempering temperature 730 ~ 780 ℃, holding time of less than 1 h.