45# steel is called in GB, S45C in JIS, 1045,080M46 in ASTM and C45 in DIN
45# steel for high quality carbon structure with steel, hardness is not high cutting processing, mold is often used to make templates, shoots, guide posts, etc., but must be heat treated.
45 # steel is widely used in machinery manufacturing. This steel has good mechanical properties. But this is a medium carbon steel, quenching performance is not good, 45 steel can be hardened to HRC42~46. So if you need surface hardness, and want to play 45 # steel superior mechanical properties, often 45 # steel surface carburizing quenching, so that you can get the required surface hardness.
1. 45# steel after quenching without tempering before hardness greater than HRC55 (up to HRC62) is qualified.
The highest hardness in practice is HRC55 (HRC58 for high frequency quenching).
2.45# steel do not use carburizing and quenching heat treatment process.
After quenching and tempering, the parts have good comprehensive mechanical properties and are widely used in all kinds of important structural parts, especially those connecting rods, bolts, gears and shafts working under alternating loads. But the surface hardness is low, not wear - resistant. Quenching and quenching can be used to improve the surface hardness of parts.
