High alloy steel is an alloy of iron which contains 10.5% of chromium. High alloy steel also has a mixture of 10% alloy. Chromium makes a thin layer of oxide on the surface of the steel and it is known as latent layer. And it is little costly than low alloy steel. To give austenitic nature to the steel, high level of carbon and manganese are added. The expanding measure of chromium provides an expanded protection from erosion. High alloyed steel can prevent consumption due to the high chromium content. High alloy steel additionally contains limits of manganese, silicon and carbon. It is utilized for the benefit in exceptional hot gasses and fluids on different components at high temperatures. For example molybdenum and nickel can be added to grant other helpful properties such as to improve formability and expanded consumption protection.
Low alloy steel is among the steels, when nitrogen, chromium and other alloy elements content that consist of less than 10.5% are known as low alloy steel. The low alloy steel contains 0.5% - 9% of chromium and 0.5% - 1% of molybdenum. Its carbon content is lower than 0.20%, with higher hardening ability and decent weldability due to its alloy trait. Chromium improves anti oxidization and corrosion ability of low alloy steel and in high temperature molybdenum enhances its strength. In low temperature environment the average steel will have higher strength but lower toughness and elongation, thus this increases the chance for brittle fracture. Low alloy steel is formed by adding nickel in 2.5-3.5% in the carbon steel to enhance its toughness in low temperature. Apart from normalizing treatment during the production process low alloy steel, quenching and tempering are also parts of improvement treatment of mechanical properties.
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