This kind of steel is usually used for forging steel. Forging process of stainless steel can be actually, but very difficult. In addition, the same piece of carbon steel can be used by the block smelting method to obtain a hard edge side and the back end of the tough and resilient, and can't do that stainless steel smelting. Of course, in different degree than the carbon steel stainless steel is easy to rust, also is bigger than risk using stainless steel.
In the AISI steel naming system, xx is carbon steel, the other is alloy steel, for example, 50 xx series is chrome steel. In the SAE naming system, with character labeling (W - 2, for example, A - 2) is A tool steels. Usually the last digit in the steel name for this kind of the carbon content of steel, such as 1095 containing about 0.95% carbon, 52100 about 1.0% of the carbon, while 5160 contains about 0.60% of carbon.
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