45# seamless steel pipe quenched and tempered parts have good comprehensive mechanical properties, and are widely used in various important structural parts, especially those connecting rods, bolts, gears and shafts that work under alternating loads. However, the surface hardness of 45# seamless steel pipe is low and it is not wear-resistant. Quenching and tempering + surface quenching can be used to improve the surface hardness of parts.
45# seamless steel pipe is called in GB, called in JIS: S45C, called 1045,080M46 in ASTM, and called in DIN: C45. The chemical composition of 45# seamless steel pipe contains carbon (C) content of 0.42~0.50%, Si content of 0.17~0.37%, Mn content of 0.50~0.80%, and Cr content of <=0.25%.
Recommended heat treatment temperature for 45# seamless steel pipe: normalizing 850, quenching 840, tempering 600.
45# seamless steel pipe is high-quality carbon structural steel, with low hardness and easy machining. It is often used in molds as templates, stubs, guide posts, etc., but requires heat treatment.
45# seamless steel pipe is qualified if the hardness is greater than HRC55 (up to HRC62) after quenching and before tempering. The highest hardness in practical application is HRC55 (induction hardened HRC58).
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