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Jiangsu qianfeng Fasteners CO.,LTD ADD:66,xinning road,jiang an economic developmentarea,rugao nantong,jiangsu,china Tel :0513-87956999 8795768 Fax:0513- 87957089 Mobile:13901429661（qiangkun,he） E-mail：postmaster@jsqianfeng.com maomao@jsqianfeng.com Http://www.jsqianfeng.com
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Improving the mechanical properties of high strength fasteners |
| Update:
2011-2-21 |
Heat treatment technology for high strength fasteners, especially its inherent quality has a crucial impact, therefore, to produce high-quality high-strength fasteners, must have advanced heat treatment technology and equipment. Heat treatment quenching and tempering is to improve the mechanical properties of the fastener, in order to meet the requirements of the tensile strength value and the Qu Qiang ratio. Therefore, quenching and tempering process of raw materials, temperature control, controlled atmosphere furnace, quenching medium, heat treatment quality detection and control have strict requirements. Quenching and tempering treatment of high strength fasteners in the production line of casting chain furnace. The temperature in the furnace atmosphere is controlled by the computer, using Rx gas as a protective atmosphere, heating and anti oxidation and decarburization can be effectively controlled, fasteners in the heating process of good quality. 8.8 high strength fastening piece is mainly in shock bottom furnace quenching and tempering treatment, affected by the shock hearth furnace structure, poor performance, the seal is not easy to control, Rx atmosphere temperature and temperature difference between the parts in the furnace of collision exists and the length of time - not to fasteners in the heating process of poor quality there, decarburization, bumps, uneven heating phenomenon. The detection of high strength fasteners after heat treatment, the main test hardness and tensile strength and microstructure (qualitative detection), Rx gas analysis, 12.9 of the 100% magnetic particle fluorescence nondestructive examination of crack. But the quenching medium cooling performance measurement, the quantitative analysis of the metallographic structure, the internal defect of the parts and the hardness of the sorting is not detected. Spheroidizing annealing in the reform of materials, material annealing by induction heating, and then enter the protection of spheroidizing annealing atmosphere in furnace insulation, advanced technology, the problem can be solved very well decarburization. High strength fasteners are widely used in net belt or cast chain heat treatment quenching and tempering line. In addition to the furnace sealing performance is good, but also has advanced atmosphere, temperature and process parameters of computer control, equipment failure alarm and display and other functions. High strength fasteners from the upper material - Cleaning - heating - quenching - Cleaning - tempering - coloring to the assembly line, all automatic control operation, effectively ensure the quality of heat treatment. High strength fastener heat treatment technology to enhance the focus on heat treatment quenching and tempering line, through the tender selection of strength, high technology level of Taiwan Province, a company design and manufacture of two heat treatment of quenching and tempering line. The line has the atmosphere, temperature and process parameters of computer control, equipment failure alarm and display and other functions, equipment, good sealing performance, high degree of automation, technical level to reach the advanced level of foreign.
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