The chemical composition of an inspection, according to the chemical composition and mechanical properties of the domestic supply of P91 alloy tube, chemical composition and steel 10,15,20,25,30,35,40,45 No. 50 should be consistent with the provisions of GB / T699-88 of . Imported P91 alloy tube according to the provisions of the contract relating to the standard test. Chemical composition 09MnV, 16Mn, 15MnV steel shall conform to GB1591-79 of. 2, the specific reference analytical methods GB223-84 "steel and alloy chemical analysis methods," the relevant section. .3, Analytical bias reference GB222-84 "steel chemical assays and chemical composition of the finished product tolerance." 3, alloy tube alloy pipe welding process specifications specifications for increasing argon protected areas and enhance the protective effect, can be welded large diameter porcelain mouth *** t91, increase the flow of argon gas welding ***. When there is an obvious obstacle to the flow of argon gas flow to the nozzle when the spatter adhesion. You must remove or replace the nozzle spatter. When the tungsten tip pollution occurs, irregular and other phenomena must be trimmed or replaced. Tungsten should not extend outside of the nozzle. Control of welding temperature is mainly to control the welding speed and welding current size. The results showed that a large current, welding can effectively prevent the rapid generation of holes. This is mainly due to the welding process at a faster rate import penetration welds t91 alloy tube, the molten metal heating time is short, less chance to absorb the gas. The company developed a scientific enterprise management system Shanghai t91 alloy tube, timely and correct marketing strategy. "Sincerity-oriented, quality for the letter" is our company's business objectives. "Special varieties, complete specifications," occupies a larger pipe market share. Company performance increase domestic t91 alloy tube, gradually expand the scale, the annual distribution of seamless million tons. I will be with a good reputation and quality products, solid strength, excellent service, low prices and the majority of users to show vision, create brilliant. t91 alloy tube | Katherine source of steel (certified) | Chengde 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.