t91 import | Katherine source of steel (certified) | Meizhou 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. Our company is a professional T91 alloy tube, p91 ??alloy tube, 1cr5mo alloy tubes, boiler tubes, alloy pipe, stainless steel rods t91 51X3.5, structural steel bar, carbon steel bar, alloy plate, boiler plate container board of Island t91, large stainless steel plate sales business Tianjin t91, has a high reputation in the T91 alloy tube industry, annual operating Chengdu, Baotou Steel, Lu Po, Anshan, Anyang, Tianjin, Zhejiang, Shanghai, and other major t91 quality steel mills, and complete specifications, quality and quantity. Implementation of national standards GB / T8162-1999, GB / T8163-1999, GB / T3087-1999, GB / T5310-1995, GB / T6479-2000, GB / T9948-2006 and so on. T91 weld tempering holding time of not less than 1 h, in order to ensure their organization is completely transformed into tempered martensite. In order to reduce the residual stress T91 steel welded joints, must control its cooling rate is less than 5 ℃ / min. T91 steel welding process is illustrated in Figure 3 shows. ① preheated 200 ~ 250 ℃; ② between welding, surface temperature 200 ~ 300 ℃; ③ After welding cooling rate of 80 ~ 100 ℃ / h; ④100 ~ 150 ℃ incubated 1 h; ⑤730 ~ 780 ℃ tempering 1 h; ⑥ not more than 5 ℃ / min cooling rate