stivali ugg Material Selection and Heat Treatment

Material Selection and Heat Treatment Process of High Strength Bolt

1100 ℃ to 1000 ℃ quenching of a CL-1 organic coolant or oil +860-870 ℃ tempered final quenching +510-520 ℃; CL-1 oil-cooling or cooling, can meet the technical conditions, Xiang 440Mtd3 hardened steel double-t , after the main mechanical properties back to Yu 'and the CI for a better cooling performance of a hardening agent, and can be adjusted, also the most stable, and therefore, the process is a better double quenching treatment process (Figure 2). Figure 3 40MnB tempering temperature of steel mechanical properties and relationships. When you hear (Ⅱ B jade) Figure 240MnB double hardened steel bolt process. % JVr an 'N-0 /', are a duo. \,[link widoczny dla zalogowanych], ~ ● l-r field too WANG Xuan Paper (. C) Figure 340MrtB tempering temperature of steel mechanical properties and mechanical properties between three groups of patterns * mean (heat treatment) 2001. No125 a bite outside the f1-v ● __; 『_ leaves - Special ● 4 Conclusion 4.1 strict control 40MnB Steel 0.001% of boron content in a range of 0.002% to ensure complete solution and 13 phase have a good hardenability. When the B content of> 0002%,[link widoczny dla zalogowanych], the hardenability not increase,[link widoczny dla zalogowanych], and brittle with the B content increases,[link widoczny dla zalogowanych], the toughness decreases. Oil quenching can not effectively inhibit B phase precipitation, using CL-l organic hardening agent cooling medium, can inhibit the precipitation of brittle phase B, to ensure good toughness. Quenching temperature of not less than 4.2 to 95,012, not higher than 120,012. Secondary quenching temperature not lower than 850 ℃, no higher than 900 ℃. Results show that, 40MnB steel is not more than M1B10.9 high strength bolts, high strength after quenching by the double, plastic toughness and stable indicators of the mechanical properties can meet the technical requirements, while a low gap sensitivity and low cold-brittle transition temperature, hot and cold processing performance is good, easy to shape. Instead of using high-quality 40MnB cr-Ni-Mo alloy steel. Significant economic benefits. References 1TreatedLow-AlloySteels [J] MetalsTechnology. 2 She River boron steel mills ed [M]. Metallurgical Industry Press, 1997. R2000 Received a lO I1 09 ~ a ~ Shanghai News and Information \Co-treatment groups City Council. January 2000 l2 acceptance will be held at the Shanghai 28FI subject successful convening of Science Hall. Experts and scholars attending the meeting are: Spring Made Academy of Sciences, Professor Xu Luoping, Gu Changgeng Engineering, Professor Pan Jiansheng, Xu Xing Bao Engineering, Professor Shao Guangjie other thirty people. Municipal Economic Commission, Zhang Weimin, Deputy Director of Science and Technology, chaired the meeting. Shanghai Electric (Group) Corporation, vice president of Tong tianxiong and other leaders attended the meeting. By the research group leader at First Shanghai Joint Heat executive vice president of professional bodies Comrade Guo Ocean as \The report discusses the development of Shanghai \Analysis of the heat treatment industry sources and lists the corresponding test data. From an environmental point of view of ecological environment in Shanghai outlined the development trend of heat treatment technology and application of heat from high-tech research and development and industry structure adjustment and industry management second put forward the development of Shanghai \countermeasures. The experts listened to the research group in the report, after careful discussion, deliberations, that the subject of distinct themes, science, through a lot of research and scientific proof, basically reflects the status of heat treatment industry in Shanghai and environmental issues,[link widoczny dla zalogowanych], evidence. Reliable data. Credible information, the proposed development of Shanghai \The experts agreed that passed the acceptance also put forward for the implementation of the outcome of the proposed development of \The meeting concluded, Shanghai Electric (Group) Corporation as vice president of Tong tianxiong concluding remarks. Children always thanked the leadership of the municipal economic commission for their support and the experts for their care and guidance. And the Message: The Span of the new century, we must seize the opportunity, down to earth, leading technology, bold new plane in the \For enterprise development and sustainable economic development of Shanghai. Shanghai's environmental protection efforts. And make due contributions. ~ Li Jingjing to 2001. No. 1

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