Precision steel pipe

Precision steel piperefers to weak corrosive medium such as air, steam, water resistance and acid, alkali, salt and other chemical etching medium corrosion of the steel. Non-standard precision steel tube can be found everywhere in people's production and living. This added elements such as chromium, nickel alloy, out of need to improve the corrosion resistance, necessary to reduce the carbon content, and low carbon content, strength is difficult to improve, it also limits the non-standard precision steel tube as structure to the application scope of data. Is there such a non-standard precision steel tube, can not only reduce the amount of precious metals to add to save costs, and the strength of materials can be increased to expand the application range, have good corrosion resistance to reduce the maintenance interest and improve the service life of the waste? In 2004 included in the national 973 plans to improve steel quality and the service life of the metallurgy "basic research project has been in 2009 through the acceptance, the project in order to improve the metallurgical quality as the foundation, with materials science as the guide, in order to prolong the service life of steel as the target. Main results are: design and develop low nickel, high strength, low cost, high abrasion resistance and low magnetic or non-magnetic resource-conserving non-standard precision steel tube former steel; pressure existing metallurgical process of smelting and continuous casting is used to derive the nitrogen content of 0.64% high nitrogen steel; research developed economical metastable steel with high strength and high tenacity. These effects to improve the international competitiveness of China's iron and steel enterprises, have broad market application prospect.

This kind of non-standard precision steel tube called high nitrogen steel. In the 1970 s, the world has a high nitrogen non-standard precision steel tube, with cheap abundant nitrogen instead of noble scarce nickel, but also improve the strength of non-standard precision steel tube and the local corrosion resistance.

Hinder the nitrogen as the main factors of alloy elements widely used is the addition of nitrogen, nitrogen solubility under atmospheric pressure is very low, it very difficult to join, because of the adding quantity is little, the net effect is not obvious, common mode of production of high nitrogen steel is pressurized smelting, need special production equipment, this greatly increased the production of high nitrogen steel interest and limiting the production. China iron and steel production country, can you use the present general metallurgical equipment under ordinary conditions of refining the high nitrogen steel? According to the performance characteristics of high nitrogen steel, high nitrogen steel application since it has 304 non-standard precision steel tube and the extensive use of the considerable corrosion resistance, and has more than 2 times the 304 non-standardprecision steel tube intensity, and the price is low, compared with 304 non-standard precision steel tube has great competitive advantage, therefore can replace 304 non-standard precision steel tube in the local area. So far, the group will focus on the original steel applied in the following several aspects: mining and coal washing abrasion resistant equipment; High strength non-standard precision steel pipe fasteners; High strength building steel; Bulletproof armor. Among them, use the original steel produced in the coal mine coal washing sieve, victory has been applied in industrial production, and showed excellent abrasion resistance. With national specification product quality supervision and inspection center, has developed victory M12 bolts, and prepare to further test the M20 bolts. Once the trial victory, and formulate the corresponding technical specification, which can be widely replace the current 304 non-standard precision steel pipe manufacturing fasteners, enormous economic benefits.