T91 steel by alloying principle, especially adding a small amount of niobium, vanadium and other trace elements imported t91 alloy tube, high temperature strength and oxidation resistance compared with 12 Cr1MoV steel has greatly improved Shanghai t91 alloy tube, but its performance is poor welding. Bolt tests showed, T91 steel has a greater tendency to cold cracking, select preheated 200 ~ 250 ℃, interpass temperature 200 ~ 300 ℃, which can effectively prevent cold cracks. T91 weld heat treatment before, must be cooled to 100 ~ 150 ℃, holding 1 h; tempering temperature 730 ~ 780 ℃ t91, holding not less than 1 h. I specialize in seamless steel, high alloy pipe, high pressure boiler tubes, low pressure boiler tubes, imported alloy pipe, oil cracking pipe, fertilizer tube, stainless steel casing pipe. While annual sales of several major steel production of seamless pipe, seamless pipe is larger suppliers. Company perennial with P91 steel pipe, T91 steel pipe, 10 #, 20 #, 35 #, 45 #, 20G, 40Cr, 20Gr, 16Mn, Q345B, Q345C, Q345D, 27SiMn, 1Cr5Mo, Cr5Mo, 12cr1movG, 10CrMo910,15CrMoG, 35CrMo, 40CrMo, T92, T23, T24, A335P92, A335P91, A335P22, A335P11 such as seamless steel pipe, sales outside diameter of 8-920, thickness 1-85mm20 #, 45 #, 16Mn seamless. Business: major steel production of seamless pipe, structural tubes, fluid tubes, low pressure boiler tubes, high pressure boiler pipe, fertilizer tube t91 alloy casing, ship management, and a variety of domestic and imported alloy materials pipe, Japan, the United States, Italy and other countries producing alloy tube. Domestic t91 alloy tube, Yichun t91, Katherine source of steel provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Katherine source of innovative ideas will lead pipe and you work into the brilliant, for a better future!