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ADD:66,xinning road,jiang an economic developmentarea,rugao nantong,jiangsu,china
Tel :0513-87956999  8795768
Fax:0513- 87957089
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Technical development of high strength fasteners

Update: 2011-4-3
From the characteristics of the development of technology, as technology integration, integration of the advanced technology and excellent enterprise own enterprise technology upgrading; from product development characteristics, performance from low-grade products to high-end products in more than 8.8 grade high strength fastener interface integration. From the point of view of enterprise management, the quality of work, product quality, production management, production progress gradually into the network process. Service, the fasteners of the large number of enterprises, enterprises including from market research, product development or improvement, manufacturing and sales, customer service service until the recovery of the whole process, involving the whole life cycle of the products, reflecting the full range of customer service, to serve the community spirit. With the globalization of economy, Chinas fastener enterprises are the factory of the world "or ready to be transformed into a" service "and" information industry "with Chinas entry into WTO in 2001 and entered the ranks of international trade. Chinas fastener products are exported to many countries around the world, the worlds fastener products are constantly influx of the Chinese market. Fasteners as Chinas import and export of a large amount of products with international standards, to promote Chinese fastener enterprises to the world, to promote the fastener enterprises to fully participate in international cooperation and competition, all with significance and important strategic significance. Fastener is a kind of mechanical parts, which is used for fastening and connecting. It has a wide range of applications. The characteristics of the fastener are various, the performance and application are different, and the degree of standardization, serialization and generalization is very high. Therefore, it is also a national (industry) standards for a class of fasteners called standard fasteners, referred to as the standard parts. The specifications, dimensions, tolerances, weight, performance, surface, marking each specific method of fastener products, specific requirements and acceptance inspection, marking and packaging items, are respectively specified in several countries (industry) standards, fasteners are the most widely used basic pieces of machinery. In the production of heat treatment, many high strength fastener materials as long as that time can be solved, pin shaft repair rivet and bolt through the same general material corresponding technology, but some rivet hardness is not too high, and even some general requirements below HRB60, the normalization of the hardness of the material in the HRB70-80, so some to go through in order to achieve the performance requirements of annealing. The tendency of austenite grain growth is promoted when the parts are quenched and tempered, which is improved on the basis of the international, and is set as 0.45%-0.80%. Si can strengthen the ferrite, to promote the cold forming properties, material elongation decreased by Si is less than or equal to 0.30%. S.P. for the impurity elements, their presence will be produced along the grain boundary segregation, resulting in grain boundary embrittlement, damage to the mechanical properties of steel, should be reduced as much as possible, as P is less than 0.030%, S less than 0.035%. The maximum content of B. is 0.005%, because of the effect of the boron element, it can increase the permeability of the steel, but it will lead to the increase of the brittleness of the steel.
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Tel :0513-87956999 8795768
Fax:0513-87957089 Mobile:13901429661(qiangkun,he)