Die steel used in the chemical composition of alloy steel low carbon content is usually in the range of 0.300.55 to obtain the thermal fatigue and thermal conductivity and excellent after heat treatment have better mechanical properties to meet the performance requirements of heat. As alloying elements, four elements such as Cr, W, Mo and V can be combined with carbon to form a special carbide. These special carbides have great influence on the temper resistance, tempering hardness and thermal stability of hot work die steel. Therefore, the hot work die steel must contain Cr, W, Mo, V and other elements. Although W can improve the thermal stability of steel, the excessive content of W can increase the sensitivity of thermal fatigue, and Mo can also increase the thermal stability of steel. Mo content can also reduce the thermal fatigue resistance of steel, but if Mo W is used, it has higher thermal fatigue resistance under the condition of obtaining the same thermal strength.
This is the current domestic die-casting die has been replaced by H11 containing Mo H134Cr5MoV1Si 3Cr2W8V. However, if the thermal strength and deformation resistance of the die at elevated temperature are considered, 3Cr2W8V is superior to H13 or H11. Some forging dies and fine dies working at high temperatures are still 3Cr2W8V. 1, forging die steel selection, 1, hammer forging die by impact load, toughness requirements higher. The medium and small hammer forging die is preferred, 5CrMnMo big hammer forging die is preferred, 5CrNiMo super big hammer forging die 5Cr2NiMoVSi 2, press forging die shock load is smaller, requiring high thermal strength.
The selection of press forging dies is 4Cr5MoSiV 4Cr5MoSiV1 2. The selection of hot extrusion die steel is characterized by the slow loading speed, and the higher heating temperature of the cavity, usually up to 500800 degrees. The performance requirements of this kind of steel should be based on wear resistance, high tempering stability and thermal fatigue resistance. Light alloy extrusion adopts better toughness hot work die steel, such as 4Cr5MoSiV4Cr5MoSiV1 steel. Steel, copper and copper alloy extrusion, in addition to the use of 4Cr5MoSiV4Cr5MoSiV1 steel, but also can use high temperature, better strength of hot die steel, such as 3Cr2W8V steel. The wear resistance of 5Cr4W5Mo2V steel is a new hot die steel the steel has high strength and high hardness at high temperature can be heat treatment or chemical heat treatment can replace the 3Cr2W8V steel hot extrusion die of some higher service life.
Table 2 hot extrusion die steel hot extrusion die material selection of workpiece name die punch mandrel extrusion cylinder sleeve, aluminum magnesium alloy 4Cr5MoSiV1 4Cr5MoSiV 4Cr5MoSiV1 4Cr5MoSiV 4CrMnSiMoV 4Cr5MoSiV1 4Cr5MoSiV 4Cr5W2VSi 4Cr5MoSiV1 4Cr5MoSiV 4Cr5MoSiV1 4Cr5MoSiV 3Cr3Mo3W2V copper and copper alloy 3Cr2W8V 5Cr4W5Mo2V 4Cr5MoSiV1 3Cr2W8V 4CrMnSiMoV 5Cr4W5Mo2V 4Cr5MoSiV1 3Cr2W8V 3Cr3Mo3W2V 4Cr5MoSiV1 4Cr3Mo3SiV 3, the selection of die casting die casting mould steel in the mold under the condition of service continuously under high speed, high pressure injection, metal erosion and heating for overall die steel performance requirements and hot extrusion die steel is similar to requirements of wear resistance, high tempering stability and thermal fatigue resistance. So the steel grades are usually the same as those used in hot extrusion dies. Zn alloy die casting die, 4Cr5MoSiV4Cr5W2VSi steel, Al and Mg alloy die-casting mould, 4Cr5MoSiV13Cr3Mo3W2V steel, Cu alloy die-casting die, 3Cr3Mo3W2V3Cr2W8V steel. 3Cr3Mo3W2V steel has high thermal strength, thermal fatigue resistance, good wear resistance and resistance to temper stability. The toughness and fatigue resistance of 3Cr3Mo3W2V steel are superior to that of 3Cr2W8V steel, and its service life is higher than that of 3Cr2W8V steel.
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