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OCT 30 2012

Steel alloy

Casting

Steel alloy has a history of over 100 years. Industry more use of steel alloy material is approximately in the second half of the nineteenth Century. The steel output and use the quantity increases ceaselessly, machinery manufacturing industry needs to solve the problem of cutting steel processing, British Macht in 1868 ( R.F.Mushet ) invented the composition of 2.5%Mn-7%W from hardened steel, cutting speed increased to 5 meters / min. Along with the commercial and transportation development, 1870 in the United States for chromium ( 1.5 ~ 2.0%Cr) in the Mississippi River to build the bridge span of 158.5 meters; the processing component of difficulties, later, some industrial countries switched to nickel ( 3.5%Ni ) the construction of large span bridge. At the same time, some countries will also build steel for ship. With the engineering and technical development, accelerate the speed of rotation machinery, 1901 in Western Europe appeared in high carbon chromium bearing steel. In 1910 developed the 18W-4Cr-1V type high speed tool steel, further cutting speed increased to 30 meters / min. The emergence and development of visible steel alloy, and is adapted to the development of the social productive forces, especially and machinery manufacturing, transportation and military needs of industry inseparable.

Nineteen twenties, due to electric arc furnace steelmaking method was used for the mass production of steel alloy, and create favorable conditions. Chemical industry and power industry development, but also to promote the steel alloy breed expand, so stainless and heat-resisting steel during this period was born. 1920 German Maurer ( E.Maurer ) invented the type 18-8 stainless steel, 1929 in the United States appeared Fe-Cr-Al resistance wire, to Germany in 1939 power industry began using austenitic heat resistant steel. After the Second World War to the 60′s, is mainly the development of high strength steel and high strength steel era, because the aviation industry and vehicle technology development, appeared a lot of high strength steel and high strength steel, such as precipitation hardening high strength stainless steel and low alloy high strength steel is its the representation of steel. 60 years later, many of the new metallurgical technology, especially the external refining technology is widely used in steel alloys, began to high purity, high precision and ultra low carbon development direction, and the emergence of maraging steel, ultra pure ferritic stainless steel new steel. The use of a thousand steel alloy steel, tens of thousands of specifications, steel alloy steel production accounted for about 10% of total output, is the national economy construction and national defence construction to use a large number of important metal materials