Steel alloy powder is divided into low-alloy steel powder and high-alloy steel powder. According to different uses, nickel, chromium, molybdenum, tungsten, manganese and other elements are added to make it have different functions. For example, as a maraging steel, 1.2709, after aging, its performance is doubled compared with that of the built state; steel alloy materials such as 316L and Corrax have better corrosion resistance because of the addition of Cr; and high nitrogen steel with increased nitrogen content and super Duplex stainless steel has higher wear resistance and fatigue strength and so on. The excellent properties of these alloys make steel alloys widely used in many application scenarios.