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38 crmoal is advanced nitriding steel, mainly used for high wear resistance. High fatigue strength and considerable strength. Size precision of nitriding parts after heat treatment, or various impact load, high wear resistance of nitrided parts, such as boring bar, grinding spindle, automatic lathe main shaft, worm, gear precision screw, precision and high pressure valves, valve stem, gauge, sample, roller, imitation model, the cylinder block, compressor piston rod, the steam turbine governor, rotating sleeve, fixed on the set, rubber and plastic extruding machine of all kinds of wear-resistant parts, etc.