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Effect of heat treatment on microstructure and properties of 10B21 cold-heading steel for fasteners
Summary
This metallurgy study examined how different heat treatment processes affect the microstructure and mechanical properties of 10B21 boron steel used to manufacture fasteners. Converting the microstructure from ferrite to tempered martensite through quenching and tempering improved strength and hardness.
Fasteners are widely used in automobile, electronic and other fields, and the demand for high performance fastener materials is increasingly urgent. 10B21 mild steel has the advantages of good plasticity, obvious heat treatment effect and so on. It is used to produce fasteners below grade 9.8. In this paper, the domestic 10B21 boron steel as the research object, through quenching, tempering and other heat treatment, change its structure from ferrite to tempered martensite, in order to improve the strength and hardness.
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