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The carbon content of this kind of steel is generally not more than 0.7%. Low carbon steel with a carbon content of less than 0.25%, its strength and yield limit is low, plastic is very high, and has a good welding, suitable for punching, welding, commonly used to manufacture screws, nuts, washers, shaft, valve guide rod and welding components, etc.. Carbon content in the 0.l% ~ 0.2% of the low carbon steel also used to produce carburizing parts, such as gear, piston pin, sprocket, etc.. The surface of the parts can be hard and wear resistant, and the core of the heart is tough and resistant to impact by the carburizing hardening. Low carbon high alloy steel can be used if required to have higher strength and impact resistance. With carbon content of 0.3% to 0.5% carbon steel, it has good comprehensive mechanical properties, not only has high strength, but also has a certain plasticity and toughness, commonly used to make a greater force of bolts, nuts, keys, gears and shafts and other parts. High carbon steel with a carbon content of 0.7% a 0.55%, with high strength and elasticity, and more for the production of ordinary plate springs, coil springs or wire rope, etc..