4Cr14Ni14W2Mo steel is commonly used in the manufacture of engine intake and exhaust valves, as well as steam and gas piping. 4Cr14Ni14W2Mo steel can also be used to manufacture titanium alloy creep molds, strong corrosive glass forming molds and core molds for die casting. Suzhou Newstar Hardware Co.,Ltd. is committing to small Hand Tool Set, small hand Tool Set Box, small Hand Tool set case for more than 15 years. We could offer you best price on Tool Set case and tool trolley cabinet, and good quality reliable partnership for long term cooperation. We offered that you can trust, welcome to do business with us. Small Hand Tool Set,Small Hand Tool Set Box,Small Hand Tool Set Case,Small Hand Tool Set Cabinet SUZHOU NEWSTAR HARDWARE CO.,LTD. , https://www.sjnewstarhardware.com
Hot work die steel 4Cr14Ni14W2Mo
chemical composition
C : 0.40% - 0.50%
Mo : 0.25% - 0.40%
Si: ≤0.80%
Cr : 13.00% - 15.00%
Mn: ≤0.70%
Ni: 13.00%-15.00%
W : 2.00% - 2.75%
P: ≤0.030%
S: ≤0.030%
Mechanical properties
Tensile strength σb (MPa): ≥ 705
Conditional yield strength σ0.2 (MPa): ≥315
Elongation δ5 (%): ≥20
Section shrinkage ψ (%): ≥ 35
Hardness: ≤248HB
Heat treatment specification and metallographic organization
Heat treatment specification: Annealing at 820 ~ 850 ° C.
Metallographic organization: The tissue is characterized by austenite type.
delivery status
Generally, it is delivered in the state of heat treatment specification, and the type of heat treatment is indicated in the contract; if it is not specified, it is delivered in the state of no heat treatment. . The forging temperature is 1110~1130°C, and the final forging temperature is 850~900°C. After forging, it is piled up in the air for cooling.
The microstructure of 4Cr14Ni14W2Mo steel is relatively stable, no phase change occurs during heating and cooling, and it has high high temperature strength and heat resistance, but the coefficient of linear expansion is large, the thermal conductivity is poor, and the thermal fatigue property of steel is lowered, which is not suitable for manufacturing. Water-cooled mold.
The addition of a large amount of Cr and Ni elements in 4Cr14Ni14W2Mo steel is mainly to obtain the austenite structure at room temperature and improve the corrosion resistance and oxidation resistance of the steel. In addition, Cr and Ni elements are solid-dissolved in austenite to solidify and strengthen austenite structure.
The addition of W and Mo elements in 4Cr14Ni14W2Mo steel is mainly for the formation of carbides, taking away the C element in the steel, avoiding the formation of carbides between C and Cr and reducing the content of Cr, thereby increasing the electrode potential of steel and maintaining the resistance of steel. Corrosive and antioxidant. The undissolved carbides of W and Mo in the high-temperature solution treatment act as pinning at the grain boundary, which can prevent the growth of austenite grains and play a role in refining the grains, which can help improve the steel. Strong toughness. In the solution treatment, all Cr, Ni elements and a small amount of W and Mo elements are dissolved in austenite, and solid solution strengthens austenite. At the time of high-temperature aging treatment, carbides of W and Mo elements are precipitated from austenite, and a small amount of carbides of Cr are also precipitated from austenite, and together with undissolved carbides of W and Mo elements, the strength of steel is improved. Hardness and wear resistance.
Since the carbides of W and Mo elements are precipitated from austenite, heating at a higher temperature and heat preservation for a longer period of time are required, so 4Cr14Ni14W2Mo steel has higher thermal stability. Good mechanical properties below 650 °C. At 600~800 °C, it is easy to strengthen due to strong aging. It is not heat-resistant at 800 °C. It has strong gas corrosion resistance below 900 °C.
4Cr14Ni14W2Mo steel is commonly used in the manufacture of engine intake and exhaust valves, as well as steam and gas piping. 4Cr14Ni14W2Mo steel can also be used to manufacture titanium alloy creep molds, strong corrosive glass forming molds and core molds for die casting.
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Hot work die steel 4Cr14Ni14W2Mo