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45# precision rolled pipe is usually made of seamless steel pipe. Seamless steel pipe is divided into two commonly used materials: GB8162 and GB8163. However, 45# precision rolled pipe is only available in GB8162. 45# is a common material for mechanical processing.

First of all, the c, Si, Mn, P, and S contents of 20# and 45# precision rolled pipe steel are different. 45 is higher than 20# steel. You can buy this steel knowledge manual and take a look. 20# steel has low hardenability, low hardenability, good plasticity, toughness, and weldability. It has better toughness after hot rolling or normalizing. It can be used to make less important medium and small carburized, carbonitrided parts, and forged parts, such as lever shafts, transmission shift forks, gears, heavy machinery tie rods, shackles, etc. 45# precision rolled pipe is a commonly used medium carbon quenched and tempered steel. The thick-walled rolled pipe factory has good comprehensive mechanical properties, low hardenability, and is prone to cracks during water quenching. Small parts should be quenched and tempered, while large parts should be normalized. They are mainly used to manufacture high-strength moving parts, such as turbine impellers and compressor pistons. Shafts, gears, racks, worms, etc.
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