As an important material for mold manufacturing, the metallurgical quality of mold steel directly affects the performance, service life, and manufacturing accuracy of the mold. With the rapid development of China's manufacturing industry, the demand for mold steel is increasing day by day, and the requirements for the metallurgical quality of mold steel are also becoming higher and higher. In order to improve the overall level of China's mold steel industry and meet the demand for high-quality mold steel in domestic and foreign markets, this article will explore ways to improve the metallurgical quality of mold steel from several aspects.

1. Optimize the smelting process

Smelting process is the foundation for improving the metallurgical quality of mold steel. At present, advanced processes such as refining outside the furnace, vacuum treatment, vacuum smelting, powder spraying treatment, and electric slag remelting are widely used both domestically and internationally to reduce the content of harmful elements, oxygen, hydrogen, and inclusions in steel. These processes not only help improve the purity of steel, but also fine tune the chemical composition and pouring temperature to ensure the stability and consistency of steel properties. Especially the electroslag remelting technology can significantly improve the low magnification structure and density of steel, and enhance the isotropy of mold steel. In addition, for mold steel with special requirements, powder metallurgy technology can be used to produce powder high-speed steel and powder high alloy mold steel to further improve the microstructure and properties of the steel.

2. Improve the forging and rolling process

The forging and rolling process is a key step in improving the isotropy of mold steel materials. On the basis of ensuring a certain forging ratio, using upsetting and drawing forging and cross rolling processes can help improve the isotropy of mold materials. At the same time, in order to reduce machining allowance and improve material utilization, advanced equipment such as precision forging machines, fast forging hydraulic presses, and high-precision continuous rolling mills are widely used to produce high-precision steel to meet the needs of mold manufacturing. The introduction of these devices not only improves production efficiency, but also significantly enhances the quality of finished mold steel products.

3. Strengthen heat treatment and precision machining

Heat treatment and precision machining are important means to improve the performance of mold steel. The heat treatment of forged and rolled materials should adopt controlled atmosphere or vacuum heat treatment to avoid the occurrence of oxidation and decarburization. For certain plastic mold steels and hot work mold steels, pre hardening and microstructure refinement should be carried out by the metallurgical department to eliminate coarse carbides and chain distributed carbides in the steel, obtain fine and uniformly distributed carbide structures, and further improve various properties of the steel, especially isotropy. In addition, precision machining of mold steel, such as grinding, polishing, etc., can improve the surface quality and accuracy of the mold, meeting higher usage requirements.

4. Improve thermal conductivity

Thermal conductivity is also one of the important performance indicators of mold steel, especially hot work mold steel and plastic mold steel. Mold steel with good thermal conductivity can quickly conduct the heat generated during processing and the heat transferred from the processed workpiece, avoiding overheating on the working surface of the mold and improving its working conditions. In order to improve the thermal conductivity of mold steel, materials with better thermal conductivity such as high-strength copper alloys and high-strength aluminum alloys can be selected, or the thermal conductivity of steel can be optimized by improving smelting and heat treatment processes.

5. Promote refined materials and productization

In order to shorten the manufacturing cycle of molds and reduce production costs, the mold manufacturing department should choose high-quality materials and products as much as possible when selecting mold steel. These refined materials and products undergo processes such as peeling, cold drawing, and grinding to achieve higher precision and surface quality. The mold manufacturing department can use these precision materials and products for simple processing to assemble and use with standard mold frames, which not only improves production efficiency but also reduces production costs and material waste.

6. Increase research and development efforts and promote the application of new mold steels

In order to improve the overall level of mold steel in China, it is necessary to increase the research and development efforts of new mold steel. By increasing research and development funding, we will rapidly develop a batch of new mold steels that are in line with international standards and promote production. At the same time, establish a unified mold material selection system and a complete series of mold steel, providing more choices for the mold manufacturing industry. In addition, the application of surface treatment technology for mold steel should be strengthened, and advanced surface treatment technology should be used to improve the wear resistance, corrosion resistance and other properties of mold steel.