Alloy steel composition and producing method thereof

A producing method of an alloy steel composition, comprising:

• performing a first heat treatment on the alloy steel composition for a first time period to soften the alloy steel composition, wherein a temperature of the first heat treatment, is gradually increased to a temperature between 780° C. to 980° C. at a heating rate of 10° C. per minute to 100° C. per minute, and the first time period is between 5 minutes to 60 minutes;
• performing a first cooling treatment on the softened alloy steel composition, wherein a temperature of the first cooling treatment, is naturally cooled to a room temperature at a cooling rate of 0.1° C. per minute to 10° C. per minute;
• performing a treatment on the softened alloy steel composition to form a workpiece;
• performing a second heat treatment on the workpiece for a second time period, wherein the second heat treatment is gradually increased to a temperature between 780° C. to 980° C. at a heating rate of 10° C. per minute to 100° C. per minute, and the second time period is between 5 minutes to 60 minutes;
• and
• performing a second cooling treatment on the workpiece to make the workpiece become a bainite structure, wherein the second cooling treatment is that the workpiece is put in a salt bath of 250° C. to 450° C. for a third time period of 5 minutes to 60 minutes,
• wherein a cooling rate of the second cooling treatment is higher than the cooling rate of the first cooling treatment, and the alloy steel composition includes 95 wt % to 98 wt % iron and one or a combination of 0.1 wt % to 2.0 wt % chromium and 0.1 wt % to 2.0 wt % nickel.