T91 steel containing trace amounts of nitrogen, the role of nitrogen in two aspects. When soldering heat: on the one hand from the solid solution strengthening effect, room temperature solubility of nitrogen in the steel is very small, T91 steel after welding the weld heat affected zone heating and post-weld heat treatment process, the process has appeared in the solution and precipitation of VN austenite heat affected zone has formed due to VN of dissolved nitrogen content increases, the degree of supersaturation at room temperature after which the tissue to improve, there is a small VN precipitates in the subsequent post-weld heat treatment, which increases the structural stability t91, increases the value of lasting strength heat-affected zone. On the other hand, T91 steel also contains a small amount of Island t91 A1 alloy tube, with the formation of nitrogen can A1N, A1N at 1 100 ℃ was a lot more integrated into the matrix, again precipitated at lower temperatures, can play a better dispersion strengthening effect. T91 alloy pipe prices M23C6 of dispersed and the presence of high dislocation density t91 alloy tube 51X3.5, improve the creep rupture strength of steel, high strength, good toughness, brittle transition temperature is low, low notch sensitivity of good performance considerations to ultra-supercritical units using P91 steel has some performance issues relative intensity data P92 steel, has a relatively small risk of the company with a strong, rich range of varieties. Perfect quality assurance, reasonable prices, quality service, and are subject to approval and trust of new and old customers and the industry. We have the spirit and the reach of the user, the user would like to think of service, continue to struggle to forge ahead, to express my sincere thanks to old and new friends over the years to support our businesses in the new century together with friends grow, we would like a more pleasant future cooperation t91 steel, Katherine source of steel (certified), Hebei District 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.