① carbon steel is the most obvious element of the solid solution strengthening effect, with increasing carbon content, short-term increase in the strength of steel, ductility, toughness down on this type of martensitic steel T91, the carbon content will rise accelerate carbide ball and gathering speed, accelerate the redistribution of alloying elements, reduce weldability, corrosion resistance and oxidation resistance of the steel, it is generally desirable to reduce the heat-resistant steel carbon content, but low carbon content, steel strength will be reduced. Compared with 12Cr1MoV steel T91 steel, carbon content is reduced by 20%, which is considering the impact of the above factors and decisions. Sales of the company consists of about a dozen series pipe, high pressure boiler pipe large diameter thick wall pipe seamless steel pipe can be divided into ordinary steel and alloy steel pipe points, divided into high-pressure steel pipe steel pipe and high temperature resistance hydrogen sulphide pipes, steel pipes are mainly used in machining processing machinery bracket, mechanical parts face specific requirements are not very high. Early menacing northern China haze let suffered another "Cardiopulmonary of suffering from" domestic t91 alloy tube, the Chinese Ministry of Environmental Protection criticized Hebei cities haze emergency form than content. To this end t91, MEP started in 2014 on the 15th winter air pollution control inspection work, and occasionally send drones inspection of imported t91 alloy tube, direct exposure. Yongqing environmental protection (33.720, 0.07, 0.21%), Longking (29.66, 1.05, 3.67%), State Power, fresh (22.29, 0.21, 0.95%), Colin Green (27.02, 0.47, 1.77%) and trimer environmental protection (27.130, 0.00, 0.00%) expected to benefit. t91 steel, Katherine source steel (certified), Jiaxing t91 provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Katherine source leader in steel with the staff warmly welcome all inquiries negotiations to create Katherine source steel a better future.