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Properties of Alloy Steel

With the development of science and technology and industry, higher requirements are put forward for materials, such as higher strength, resistance to high temperature, high pressure, low temperature, corrosion resistance, wear resistance and other special physical and chemical properties. Carbon steel can no longer be completely fulfil requirements. Disadvantages of carbon steel:

With the development of science and technology and industry, higher requirements are put forward for materials, such as higher strength, resistance to high temperature, high pressure, low temperature, corrosion resistance, wear resistance and other special physical and chemical properties. Carbon steel can no longer be completely fulfil requirements.
Disadvantages of carbon steel:
(1) Low hardenability. In general, the maximum hardened diameter of carbon steel water quenching is only 10mm-20mm.
(2) The strength and yield strength are relatively low. For example, the σs of ordinary carbon steel Q235 steel is 235MPa, while the σs of low-alloy structural steel 16Mn is above 360MPa. The σs/σb of 40 steel is only 0.43, which is much lower than that of alloy steel.
(3) Poor tempering stability. Due to the poor tempering stability, when carbon steel is quenched and tempered, a lower tempering temperature is required to ensure higher strength, so that the toughness of the steel is low; in order to ensure better toughness, high tempering temperature is used. The strength is low at high temperature, so the comprehensive mechanical properties of carbon steel are not high.
(4) The requirements for special performance cannot be met. Carbon steel is often poor in oxidation resistance, corrosion resistance, heat resistance, low temperature resistance, wear resistance and special electromagnetic properties, and cannot meet the needs of special performance.

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