Pickling seamless manufacturers | seamless steel pickling (certified) | seamless steel pipe

Post-weld heat treatment using the program Ⅰ seamless welded specimens should be local temperature tempering after welding. Heat treatment process: heating rate of 200 ℃ / h, rose to 715 ℃ temperature for 1 hour and 15 minutes, the cooling rate of 100 ℃ / h, down to 300 ℃ after air cooling. Specific use JL-4 type crawler-type electric heater (1146 × 310) surrounding the seamless weld acid phosphate, silicate cotton with a seamless phosphide layer insulation, insulation thickness 50mm, temperature control DJK -A type electric heater automatic temperature control device. 2.1 welding materials for the working characteristics of 15CrMo steel welding of high-pressure pipelines and field, based on past experience, referring to the welding process card provided from abroad, we have chosen two options for welding tests. Program Ⅰ: welding preheating, use ER80S-B2L wire, T1G welding backing, E8018-B2 welding, SMAW cover up, local heat treatment after welding. Program Ⅱ: adopt ER80S-B2L wire, T1G welding backing, E309Mo-16 electrode, custom hatch arc cover up, no heat treatment after welding of high-pressure boiler pipe welding and production of high-pressure boiler pipe mainly used to manufacture high-pressure and more pressure The steam boiler tubes with high-quality carbon steel, alloy steel and heat-resistant stainless steel seamless steel tubes, boiler tube through which the party is at high temperature and high pressure work under high temperature flue gas pipes and water vapor action also oxidation and corrosion will occur, thus requiring a durable steel with high strength, high oxidation resistance, and good organizational stability, the use of steel are: high-quality carbon structural steel steel are 20G, 20MnG, 25MnG; alloy Steel steel 15MoG, 20MoG, 12,15,12Cr2MoG, 12,12Cr3 like; heat-resistant stainless steel used 1Cr18Ni9,1Cr18Ni11Nb high pressure boiler steel in addition to chemical composition and mechanical properties, hydrostatic testing done by the root seamless pickling steel standards, to be flaring, flattening test. Steel to heat treatment delivery. In addition, finished steel microstructure, grain size, decarburization there are certain requirements. It is a seamless boiler tubes. The method of manufacturing the same and seamless, but the steel used in the manufacture of steel, there are strict requirements. Depending on the temperature level is divided into two general boiler pipe and high pressure boiler pipe. Pickling seamless manufacturers | seamless steel pickling (certified) | seamless by virtue Liaocheng Industry Co., Ltd. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In virtue tube industry leadership with the staff warmly welcome all inquiries negotiations to create the virtues of Industry a better future.