H13 die steel

H13 steel is available mold steel mask manufacture

When 1.2344 die steel is used as hot die steel, how to improve the lifetime of die?
1.2344 die steel is the most widely used hot die steel. However, with the development of the aluminum extrusion industry, high- requirement for the extrusion mold is needed.
Effect of chemical composition on properties of H13 steel
1, C content is directly proportional to the strength of the steel, the increase of C content in the steel will improve the strength of the steel. for hot die steel, it will make the high-temperature strength, thermal hardness and wear resistance, but will lead to the reduction of its toughness.
2. Cr has a favorable influence on the abrasion resistance, high-temperature strength, thermal hardness, toughness and hardenability of steel. When the content is high, the tempering resistance is also high, and the corrosion resistance of steel will be improved obviously when it melts into the matrix.
3. Ti, V, and Mo elements. In the forging or quenching stage, carbide forming elements such as Ti and v. Mo will form alloy carbides insoluble in austenite, thus impeding austenite grain growth and refining austenite grain.
Also, in the tempering process stage, because 1.2344 die steel contains more carbide forming elements (Ti, V, Mo), when the tempering temperature is higher than 500℃, the cementite dissolves, forming a small, dispersed alloy carbide. The secondary hardening of H13 can be caused by the dispersion of alloy carbide.
Microstructure and properties of 1.2344 die steel
1. Spheroidized annealing structure
When H13 steel is accepted in the annealed state, the main structure of steel in this state is pearlite. The morphology of pearlite is different with the different annealing process. Compared with the flake pearlite with the same chemical composition, granular pearlite has lower strength and hardness, but better plastic toughness.
For H13 steel in the annealed state, the original structure is generally required to be a point or granular pearlite to facilitate subsequent machining and forming, and to obtain austenite with refined grain in the quenching stage.
2. Heat treatment strengthening
The main structure of 1.2344 die steel in the annealing state is pearlite. and its performance is not up to the requirements of the mold. so it must be hardened and tempered to improve its overall performance.
In the quenching stage, the steel is heated above the austenitizing temperature. and then the steel is cooled with a greater degree of supercooling to obtain the hardened martensite structure. In the tempering stage, the steel is reheated to the austenitizing temperature. and the hardened martensite structure is transformed into a tempered martensite structure, to improve the comprehensive properties of the steel.
1) the quenching phase
Through the metallographic analysis of a large number of dies with premature failure, it is found that the coarse austenite grain is one of the important reasons leading to the premature failure of dies. The thickness of austenite grain is directly related to the service life of the die.
The larger the grain size, the greater the tendency of cracking and distortion during quenching. Therefore, the austenite grain size must be controlled effectively.
The original structure and thermal conditions of steel will affect the austenite crystal. Therefore, in the quenching phase, to obtain fine grain austenite, it is necessary to strictly control the heating temperature and holding time.
2) tempering stage
After the steel is hardened, there will be greater internal stress. The purpose of subsequent tempering is to remove the internal stress and make the metastable structure stable.
Too much residual austenite will reduce quenching hardness and embrittlement will occur during use due to aging deformation (transformation into martensite). General primary tempering can not reduce the residual austenite to a reasonable level. In actual production, secondary tempering is used, the tempering temperature is usually about 590℃, and air cooling.
Since martensite is formed during rapid cooling, air cooling occurs after each tempering to create a temperature gradient that allows the residual austenite to be transformed more thoroughly. After the second tempering, the hardness of the workpiece is maintained at HRC 47-50 to ensure that its performance meets the requirements.
3. Banding segregation
1.2344 die steel steel belongs to the hypereutectoid steel with high alloying element content. Carbide segregation may occur during smelting and casting, and a thick carbide belt is formed after forging and rolling.
The quantity, size, and distribution of carbides directly affect the structure and properties of steel. The elongation and reduction of the area were affected. Ribbon structure is a kind of raw material defect, which is difficult to avoid in production and can only be alleviated or eliminated by subsequent processes. The general method is uniform annealing or multiple forging. The above two methods can be used alternately to reduce or eliminate the phenomenon of banding segregation.
The quality control of die steel is very important, it affects the life of die, product quality, and production efficiency.

H13 die steel, otai helps you avoid all possible cheat
Otaisteel is a stable and reliable supplier for fortune 500 companies at home and abroad, such as thyssenkrupp, china north industries group corporation limited. Otai exports various tool steel and alloy to more than 30 countries from Europe and American, Middle East, and Asia. our steel materials meet DIN/ ASTM/EN/JIS etc different international standards.
H13 die steel is a hot work die steel. It is formed by adding alloying elements to carbon steel. H13 die steel is the most widely used and most representative hot work die steel. It can be used for die forging hammer, Aluminum alloy die-casting molds, hot extrusion dies, high-speed precision forging dies and forging press dies, etc. It can also be used to make important components in the aerospace industry. A client comes from Russian bought the H13 die steel from our company, in order to make the forging dies.
Due to the special variety of mold steel, and the special steel demand in the market is small (only 10% of the steel mill), steel mills are not willing to produce mass production, so some unscrupulous traders fake the real die steel, the mold steel market engage in black smoke. There are many companies selling mold steel without testing equipment, and the materials with unstable quality are directly delivered to the factory. When the factory is processing fast, it finds holes or cracks inside. At this time, the factory will blame the mill for the painful days, and the subsequent delivery will be delayed. The factory brings serious economic losses.
Special steel application expert Tan Hong Pu tells you the 8 secrets you don't know about buying mold steel:
1. The small steel mill changes the tag of the big steel factory;
2, ordering at the big steel mill, but not according to national standards, stealing the process, saving costs
3. Intermediate frequency furnace instead of electric arc furnace production
4, electric arc furnace instead of electroslag.
5. The steel mill determines that the defective material acts as a good material.
6. Play word games to ensure that the main elements meet national standards, not to mention harmful elements exceeding the standard.
7, sell universal steel, what materials you want;
8, non-standard direct sales as a national standard.
Therefore, it is 100% safe to buy materials with Aotai special steel, and the export standard test also saves you 30%. Anyone who verbally says how good the quality is, no test is empty talk. Strict testing and safe use; peers do not dare to face-to-face testing, Aotai dare to face-to-face inspection for you, welcome to our company!