20g high-pressure boiler pipe _ three-source Trading (certified) _ Chizhou high pressure boiler tube

Tianjin trimeric Source Trading Co., high alloy pipe 15crmoG www.shtsm.com15CrMoG alloy tube alloy tube mechanical properties: structural steel workpiece in the heating and cooling process, due to inconsistencies 13crmo44 high-pressure boiler and cooling rate of the surface layer and the core part time tube, forming temperature, will lead to volume expansion and contraction uneven stress, i.e., thermal stress. Under the action of thermal stress due to a temperature below the surface began core section, leaving the central portion is larger than the contraction of the heart portion is pulled high pressure boiler tubes, when the end of the cooling, the cooling due to the volume contraction core section last leaving the surface layer can not be freely performed by Ministry press center of tension. That is the role of thermal stress and finally to the workpiece surface pressure and heart Ministry tension. This phenomenon by the cooling rate, the impact of the material composition and heat treatment and other factors. Tianjin trimeric Source Trading Co., Ltd. sells high alloy pipe. 12Cr1MoVG produce yellow block martensitic alloy tube causes and treatment methods: 12Cr1MoVG AC1 phase transition point is about 774 ~ 805 ℃, about AC3 about 882 ~ 923 ℃. Its normalizing temperature theoretically should AC3 + 30 ~ 50 ℃, more that 930 ~ 950 ℃. When performing normalizing heat treatment at 900 ℃ under heating, namely insufficient when normalizing temperature is between AC1 ~ AC3, original tissue sorbite, bainite austenite and ferrite not completely dissolved (only at temperatures close to the AC3, a certain amount of ferrite to austenite is dissolved.) gb5310 high pressure boiler tubes, due to alloying elements sorbite, bainite area carbon and vanadium in more enriched, so large austenite stability in these regions formed in the air-cooling time and due to the precipitation of ferrite, austenite transformation failed to make a more stable 12cr2mo high pressure boiler tube, it transformed into martensite and bainite easier. Because low heating temperature, austenite grain formation and growth failed to annexation, it transformed martensite and bainite tiny compared. 20g high-pressure boiler pipe _ trimer source Trading (certified) _ Chizhou pressure boiler tubes supplied by Tianjin trimeric source Trading Company. Tianjin trimeric source Trading Company (www.shtsm.com) (www.91hejinguan.com) is Tianjin, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. In the three-source Trading leadership with the staff warmly welcome all inquiries negotiations to create three-source Trading a better future. You can also access (www.91hejinguan.com/supply_details_42293105.html), for more information about the company.