30CrMnSiA structural steel pipe is a high-strength tempering and tempering structural steel commonly used in the machinery manufacturing industry. 30CrMnSiA structural steel pipe has high strength and toughness, moderate cold deformation and plasticity.
1) the role of carbon. With a medium carbon content of about 0.3%, 30CrMnSiA structural steel pipe has not only certain strength and hardness, but also good plasticity and toughness.
2) the role of silicon. Silicon is a non-carbide-forming element, which does not form carbides with carbon. Instead, it is completely dissolved in ferrite, which significantly improves the 30CrMnSiA structural steel pipe strength and hardness of ferrite, while decreases the plasticity and toughness. At the same time, Silicon can also make the brittle zone of low temperature tempering move towards high temperature, so that 30CrMnSiA structural steel pipe can obtain high comprehensive mechanical properties after low temperature tempering.
3) the role of chromium. Chromium and carbon affinity is strong, forming alloy carburizing body, can improve the strength and hardness of 30CrMnSiA structural steel pipe.
4) the role of manganese. The affinity between manganese and carbon is weak, most of which are dissolved in ferrite or austenite, while a few are dissolved in carburite to form alloy carburite, which can improve the strength and hardness of 30CrMnSiA structural steel pipe and significantly improve the hardenability of 30CrMnSiA structural steel pipe.
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