Ordinary low alloy steel is a kind of ordinary alloy steel containing a small amount of alloying elements (in most cases, the total amount of W is less than 3%). This kind of steel has high strength, good comprehensive performance, corrosion resistance, wear resistance, low temperature resistance, good cutting performance and welding performance.
Under the condition of saving a lot of rare alloy elements (such as nickel and chromium), ordinary low alloy steel can be used up to 1.2-1.3t carbon steel, and its service life and service range are much longer than carbon steel. Ordinary low alloy steel can be smelted in open hearth furnace and converter with the same cost as carbon steel.
Alloy steel for engineering structure
This refers to alloy steel used in engineering and building structures, including weldable high-strength alloy structural steel, alloy reinforced steel, alloy steel for railway, alloy steel for geological petroleum drilling, alloy steel for pressure vessel, high manganese wear-resistant steel, etc. This kind of steel is used as engineering and building structural parts. In alloy steel, the total alloy content of this kind of steel is low, but the production and use are large.GB6728 standard mild carbon steel square tubes
Alloy steel for mechanical structure
This kind of steel refers to the alloy steel suitable for manufacturing machinery and mechanical parts. On the basis of high quality carbon steel, one or more alloy elements are added appropriately to improve the strength, toughness and hardenability of the steel. This kind of steel is usually used after heat treatment (such as quenching and tempering, surface hardening). It mainly includes alloy structural steel and alloy spring steel, including alloy steel with quenching and tempering treatment, alloy steel with surface hardening treatment (carburizing steel, nitriding steel, surface high frequency quenching steel, etc.), alloy steel for cold plastic forming (cold forging steel, cold extrusion steel, etc.). According to the chemical composition, the series can be divided into Mn series steel, SIMN series steel, CR series steel, CrMo series steel, CrNiMo series steel, NJ series steel, B series steel, etc.skd61 steel rod bar
Superalloy is a kind of thermal strength material with enough rupture strength, creep strength, thermal fatigue strength, high temperature toughness and sufficient chemical stability at high temperature, which is used for thermal power components working at about 1000 ℃.
According to their basic chemical composition, they can be divided into nickel base superalloy, iron nickel base superalloy and cobalt base superalloy.
Precision alloys are alloys with special physical properties. It is an indispensable material in electrical industry, electronic industry, precision instrument industry and automatic control system.
According to their different physical properties, precision alloys can be divided into seven categories: soft magnetic alloy, deformed permanent magnetic alloy, elastic alloy, expansion alloy, thermal bimetal, resistance alloy and thermocouple alloy. The vast majority of precision alloys are based on ferrous metals, and only a few are based on non-ferrous metals.
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