As for the mold steel used at home and abroad, the density of mold steel is usually about 7.85, usually mold steel for forgings, the density is 8000-8400 kg/m3. different cast steel with different proportion of alloying elements added, the density of cast steel will vary in a very small range.

Density is a property of substances, each substance has a certain density, and the density of different substances is generally different. So we can use density to identify substances. Therefore, we can use the density formula ρ=M/V to calculate the density of any die steel.

According to the density formula: ρ=m/v, that is, the factors that determine the mass and volume of the mold steel determine the density of the mold steel. Microscopically, the molecular weight and molecular gap together determine the density of a substance. Volume, size, mass, pressure, pressure and temperature all affect the density of a substance. Although the density of a substance itself is a certain property, the substance has different states, and the density will only change if the state of the substance is transformed. For example, heating water will make the water evaporate, the density becomes smaller, increase the pressure will make the water vapor condensed back into liquid water, the density becomes larger. We all know that the density of iron is 7.8g/cm3, the steel mold is composed of iron and some trace elements, the proportion of alloying elements is very small, but various compounds will be formed in the molding process. The space occupied by the compounds is different, resulting in the same volume of cast steel with different internal voids, which is the main factor affecting the density of cast steel. However, as less than 10% of alloying elements are added to the cast steel, it has little effect on the overall cast steel, and the density is close to iron.

The form is getting bigger and bigger. On the one hand, the mold for molding wood is getting bigger and bigger, on the other hand, in order to improve production efficiency, a mold has more than one cavity, so the demand for large mold steel increases year by year; the manufacturing precision of the mold is getting higher and higher, and the quality of steel requires good stability; the demand for plastic mold steel and injection mold steel is increasing; the demand for medium and high quality mold steel is increasing, and there is a surplus of poor quality cast steel; in addition With the increase in the use of mold standard parts, the standardization and commercialization of molds, the improvement of mold steel products will put forward higher requirements for quality, variety, specifications and delivery cycle. Stamping steel products. This die steel is similar to alloy 4330, pure steel technology. It has excellent dimensional stability and has been field tested in zinc machining, aluminum die casting, plastic and rubber tooling, and various types of sheet metal forming. It allows for various forms of surface treatment, including flame and induction hardening, carbide coating, PVD and nitriding. As a result, SKD61 die steel not only has the advantages of a die steel, but also has some of the characteristics of an alloy steel product. This will contribute to the great development of domestic steel industry.

Therefore, steel enterprises should be based on the development trend of the domestic mold industry and the needs of the mold market, to seize the research and development of high-precision, high toughness, corrosion resistance, high strength cast steel new grade quality.

Domestic cold and hot processing stamping steel has reached the world's advanced level. I believe that in the future, the quality and technology of China's mold steel production will be better and better, the mold steel market is developing faster and faster, will drive the domestic stamping industry to a higher level of development, a better future, we will wait and see. (Chongqing Meida)