S7 hot holled steel round bar is belongs to shock -wearing tool round bar. S7 hot rolled steel round bar has high toughness and high wear-resisting. S7 forged round bars are mainly used for made bearing, various parts and so on.
According to the properties, GB/T 3077 20SiMn2MoV is mainly used for components with long working time at low temperature, heavy load, big section work conditions.
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