Application: The first type of alloy structural steel is used to make various machine parts and engineering components. This kind of steel has just right hardenability, so many of them are used to make parts of instruments with relatively large cross-sectional areas. The second type is alloy tool steel. As can be seen from the name, this type of steel is mainly used to make some tools, such as measuring tools, hot and cold molds, knives, etc. This type of steel has good wear resistance and toughness. . The third type is special performance steel, which has some special myocardial infarction, so the manufactured items have special properties, such as heat-resistant steel and wear-resistant steel, which can meet some special requirements in production.