The quenching hardness of 45# seamless steel pipe is between HRC20~HRC30; the quenching hardness of 45# seamless steel pipe is between HRC55~58, and the limit value can reach HRC62; the 45# seamless steel pipe must be placed for 15-20 days before it can be used. Because of aging treatment, the performance of 45# seamless steel pipe is stabilized.
The highest hardness used in practice is HRC55 (high-frequency quenching HRC58. 45# seamless steel pipe is called in GB, called in JIS: S45C, called 1045, 080M46 in ASTM, and called C45 in DIN.
45# seamless steel pipe High-quality carbon steel for layout, low hardness and easy cutting processing. It is commonly used in molds as templates, tips, guide posts, etc., but heat treatment is required. 45# seamless steel pipe is qualified if the hardness is greater than HRC55 (up to HRC62) before tempering after quenching.
