Die steel 738 is a commonly used die steel material, with excellent mechanical properties and wear resistance, widely used in die manufacturing industry. The following will be introduced in detail from the aspects of material composition, mechanical properties, heat treatment process and application fields.
1. Material composition
Die steel 738 is mainly composed of carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), molybdenum (Mo), cobalt (Co) and other elements. Among them, carbon is the main element to improve the hardness and strength of steel, silicon and manganese can improve the strength and toughness of steel, phosphorus and sulfur are impurity elements in steel, have a certain impact on the performance of steel, chromium, molybdenum and cobalt are alloying elements, can improve the wear resistance and corrosion resistance of steel.
Second, mechanical properties
Die steel 738 has high hardness, strength and toughness, its mechanical properties mainly include tensile strength, yield strength, elongation and impact toughness and other indicators. In general, the tensile strength of die steel 738 is between 1200-1500MPa, the yield strength is between 1000-1300MPa, the elongation is between 10-15%, and the impact toughness is between 20-30J/cm². These mechanical properties make die steel 738 able to withstand large loads and impact loads, with good wear resistance and corrosion resistance.
Third, heat treatment process
The heat treatment process of die steel 738 mainly includes annealing, normalizing and quenching steps. Annealing process can eliminate the internal stress of steel, improve the toughness and machinability of steel; Normalizing process can improve the hardness and strength of steel, so that it is suitable for some high requirements of mold manufacturing; The quenching process can make the steel quickly cool, forming a high hardness and wear resistance. The choice of heat treatment process needs to be determined according to the specific mold manufacturing requirements and use environment.
4. Application field
Die steel 738 is widely used in the mold manufacturing industry, especially in the fields of plastic molds, die casting molds and stamping molds. Because the die steel 738 has high hardness and wear resistance, it can withstand greater impact load and friction, so it is suitable for manufacturing some molds with higher requirements, such as auto parts molds, home appliance molds, electronic products molds, etc. In addition, die steel 738 can also be used to manufacture some of the more demanding cutting tools and cold working tools.
In summary, die steel 738 is a die steel material with excellent mechanical properties and wear resistance, which is widely used in the die manufacturing industry. Its material composition includes carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, cobalt and other elements, with high hardness, strength and toughness. The heat treatment process includes annealing, normalizing and quenching steps, which can improve the properties of steel. The main application areas include plastic molds, die casting molds and stamping molds.
