45# steel pipe
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45# steel pipe is usually made of seamless steel pipe. Seamless steel pipe is divided into GB8162 and GB8163, but 45# steel is only available in GB8162. 45# is a common material for mechanical processing. I don't know much about A3 air pipe, which is a kind of fluid pipe and is likely to be tested.
First of all, 20# and 45# steel have different contents of C, Si, Mn, P and S. 45 is higher than 20# steel. You can buy this steel just for a look at the manual. 20# steel hardenability, low hardenability, plasticity, toughness, good weldability, better toughness after hot rolling or positive fire, can make less important medium and small carburizing, carbon-nitrogen co-penetration, forging parts, such as lever shaft, gearbox shift fork, gear, heavy machinery pull rod, hook ring, etc. 45# steel is commonly used medium carbon quenched and tempered steel, with good comprehensive mechanical properties, low hardenability and easy to crack during water quenching. Small parts should be treated with quenching and tempering, and large parts should be treated with normalizing. It is mainly used to manufacture high-strength moving parts, such as turbine impellers and compressor pistons. Shaft, gear, rack, worm, etc.
Use
They are usually suitable for seamless steel pipe material, seamless steel pipe is divided into GB8162, GB8163 these two commonly used, but 45# steel only GB8162, 45# is a common material for machining.
45# steel pipe contains about 0.45 carbon, contains a small amount of manganese, silicon, etc., and high-quality carbon structural steel with low sulfur and phosphorus content. To put it bluntly, high-quality steel is used for certain hard parts in machinery, but it can also be used by No. 35, thus saving materials and saving costs.
45# steel pipe (GB/T14975-2002) is widely used in chemical, petroleum, textile, medical, food, machinery and other industrial corrosion-resistant pipes and structural parts and parts made of stainless steel hot rolling (extrusion, expansion) and cold drawing (rolling).
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