Abstract
40CrMnSiB steel is a new type of B-containing structural steel. To research the effect of tempering temperature on mechanical properties of 40CrMnSiB steel, forging, normalizing and quenching are carried out on material firstly, then temper respectively at 350°C400°C450°C500°C550°C600°C650°C and 700°C. After tempering, mechanical properties are tested. Also the hardness, along a radius of section, of the material after tempering at 300°C is measured and the effect of tempering temperature on mechanical properties of 40CrMnSiB steel is analyzed. The results show that: the mechanical properties of 40CrMnSiB steel is sensitive to temper temperature, properties range a large scale with temper temperature; it has a strength of 1800MPa (or more) with good ductility, toughness and fine comprehensive mechanical properties; the hardness of the material after tempering at 300°C is over 50HRC, hardenability is fine, the main microstructure is martensite.
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