The nature and purpose of alloy steel
Steel refining in accordance with its general approach can be divided into Bei Simai converter steel (Bessemer converter), alkaline converter steel, open hearth steel, electric furnace steel.
According to carbon contained in the ingredients can be divided into low-alloy steel, high alloy steel.
According to their shape is divided into steel products (section), steel bars (bar), steel (plate).
For a specific purpose, while adding various alloying elements can have a special alloy steel (special alloy steel), referred to as special steel.
Here on the nature and purpose of special alloy steel to make a rough description.
(1) high-temperature steel (high-temperature steel) for the manufacture of boilers. At 500 ℃ to 600 ℃ continuous use temperature, retain their mechanical properties. High-temperature steel, copper is the main alloying elements.
(2) heat-resistant steel (heat-resistant steel). Adding chromium in steel, nickel and silicon to make steel resistant to high temperature 1300 ℃. Such steel is usually used in the manufacture of industrial furnaces and resistance wire.
(3) stainless steel (stainless steel), adding a small amount of copper in the steel can delay the steel corrosion rate in the air. If more than 12% increase in steel of chromium steel, the corrosion can be avoided. Nickel is added if more and better corrosion resistance, and improve the Le of steel. Currently the food industry and chemical industry is the widespread use of stainless steel. Kitchen utensils, cutlery and surgical appliances are stainless steel manufacturing.
(4) Tool Steel (Tool steels) than carbon tool steel structural steel, commonly used for manufacturing saw blades, drill bits, etc. Special steel is added chromium, tungsten, cobalt, molybdenum, vanadium and other alloy elements, and after appropriate heat treatment. The following types and uses of the steel to make a summary table for reference. From the above table we can see many types of steel, and a variety of steel products have their own special purposes; which include iron and steel industry is a wide range of industries, to fully develop the steel industry, may in fact not made overnight.
