Classification of hot work die steels in the United States
There are two main categories of hot work die steels in the United States: hot work die steels, and super hot strength alloys.
Selection of hot work die steel
In order to ensure the service life of the mold, the mold should be cooled, and the hot and cold alternating mold will crack, that is, thermal fatigue cracks, so the material is required to have crack resistance and thermal fatigue resistance.
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The main series are selected according to thermal strength:
Low alloy quenched and tempered die steels (6g, 6f2, 6f3→), medium chromium hot work die steels (H11, H12, H13), → tungsten hot work die steels (H21, H22).
Non-standard hot work die steels: e.g. 6H4 for hot heading dies. If the thermal wear resistance cannot be met by using H11, H12, and H13, 6H1 and 6H2 can be selected.
When the mold is required to be based on hot work wear resistance, D2→D4 M2, M4 → powder steel can be selected. The high-temperature wear resistance of steel-bonded cemented carbide and cobalt-based cemented carbide is very high, but its thermal exhaustibility (i.e., cold and hot fatigue resistance cracks) is very poor, and cannot be used in the state of quenching and heat.
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CR12MOV Material properties
CR12MOV钢是碳钼莱氏体钢。
The carbon content of CR12 steel is much lower, and the addition of molybdenum and vanadium makes the hot workability of the steel, the impact toughness of the steel and the carbide distribution significantly improved.
The steel has good wear resistance, hardenability, hardenability, strength and toughness, thermal stability, compressive strength, as well as micro-deformation, excellent performance and a wide range of adaptability.
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Softening temperature 520 °C.
THE CUTTING LENGTH IS LESS THAN 4MM, AND THE WEAR RESISTANCE OF THE STEEL IS 3~4 TIMES THAT OF THE LOW STEEL, AND THE QUENCHING VOLUME IS DEFORMED. HARDENING DEPTH: OIL QUENCHING 200~300MM.
During the crystallization process, eutectic network carbides (where the carbon content is about 20% and the eutectic temperature is about 1150°C) are formed.
These carbides are hard and brittle.
Although there is a certain degree of crushing carbide, along the rolling direction of the carbide strip, the network, the blockage, the stacking distribution, and the segregation increase with the increase of the steel diameter.