We are delighted to see that the basic standards led by the China Fastener Standardization Technical Committee have issued more than 10 new standards every year. In 2009, a number of fastener standards and related standards were announced and implemented in 2010. Fastener standards such as: GB/T802.3-2009 "hexagonal flange cap nut welding type", GB/T802.4-2009 "hexagonal low spherical cap nut welding type" GB/T802.5-2009 "Non Metal insert hexagonal locking cap nut welding type", GB/T923-2009 "hexagonal cap nut", GB/T3098.22-2009 "fastener mechanical properties fine-grained non-tempered steel bolt screw and stud" . Fastener related standards such as: GB/T5267.4-2009 "fastener surface treatment corrosion-resistant stainless steel passivation treatment", GB/T5953.1-2009 "cold steel wire part 1 heat-treated cold-rolled steel wire", GB /T5953.2-2009 "Cold-free steel wire second part non-heat-treated cold-rolled steel wire", GB/T230.1-2009 "metal material Rockwell hardness test part 1 test method", GB/T4340.1-2009 "Vickers hardness of metal materials Part 1 test method", GB/T4340.4-2009 "Metal material Vickers hardness part 4 hardness value table", GB/T23904-2009 "Non-destructive testing ultrasonic surface wave detection method" and so on. The newly developed standards include non-tempered cold-rolled steel hot-rolled wire rods and cold-rolled steel hot-rolled wire rods; revised GB/T3098.1-20XX “Mechanical performance bolts and studs for fasteners†are also submitted for approval. in. Through the extensive development, revision and publication of fastener standards, we can see that the fastener industry has achieved brilliant results in these years. In the future, these standards will lead the healthy development of China's fastener industry to the international advanced level.
Other Special Steel Is different from the traditional steel, it is mainly formed by the alloy, generally has good oxidation resistance, corrosion resistance, high temperature resistance and other characteristics, it can be applied in a very harsh environment. Used for special industries. The main use is the production of various furnace components, the maximum temperature of 1300 degrees Celsius, could be applied in the condition of high temperature 1150℃. Such as furnace materials, automotive cleaning equipment, materials, etc.. As well as nuclear reactor cooling system, heating furnace, carburizing basket and fasteners, heat treatment fixture.
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