The cryogenic treatment for mould steel AISI D2 steel

     D2 steel is austenitizing at 1040 ° C, holding time are 10 minutes, 20 minutes and 30 minutes, and then the oil quenching, and cryogenic treatment.
     After testing can find the following points:
     Around cryogenic treatment hardness changes is not obvious, indicating that mould steel AISI D2 steel retained austenite is very little at 1040 ° C quenching.
     When cryogenic treatment time is 4 hours and 8 hours the hardness of the samples increase the amount is larger, showed that cryogenic treatment time is too short, the transformation of residual austenite is not completely. The processing time in 4~8 hours, transformation basically completed.
     After 2 hours of tempering at 500 °C, D2 steel hardness decreased obviously. Compared with the hardness after cryogenic treatment, the difference between the maximum amount can reach 6.8HRC. This is because quenching martensite transformation into tempered martensite in the process of tempering, matrix hardness reducing lead to material hardness decreased. May also be because the tempering temperature is too high, the transformation of martensite is too big, and the presence of grain growth by caused.

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The applicable scope of tool steel 1.2080 steel

    Tool steel 1.2080 steel belongs to high carbon high chromium martensitic steel, is widely used for cold working die steel. The steel has good hardenability, wear resistance, thermal processing. The carbide distribution is better in the steel, can be used to make the cold work die of complex shape and frequent work. Such as cold die punch, thread rolling die, drawing die, die material, powder metallurgy die, woodworking cutting tools, cold cutting scissors drill sleeve and gauge ect.
    In development, we repeated the exploration and experiment, formulate reasonable smelting process and special mold and the forging process, the 1.2080 die steel to achieve uniform, in addition to the standard material processing, bold innovation, the double knife chip of new technology, greatly improved the efficiency, shorten cycle, reduce cost.

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The application of alloy structural steel 4140

    Alloy structural steel 4140, similar to the performance of 4135, due to increased carbon and chromium content of C Cr, thus the strength and hardenability are better than that of 4135 steel after quenching and tempering, have higher fatigue strength and resistance to repeated shocks, low temperature impact toughness is good, and no obvious temper brittleness, generally used in the steel after quenching and tempering.
    4140 alloy steel generally used in the manufacture strength is higher than 4135 and section size is larger important parts, such as axle, gear, connecting rod, gear box, gear, supercharger engine cylinder, spring, spring clip, 1200~2000mm petroleum drill stem joint, fishing tools and instead of the nickel-containing higher modulation steel.

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The special heat treatment of die steel 1.2379

    The cryogenic treatment of die steel 1.2379:
In order to obtain the highest hardness and dimensional stability, the mold immediately after quenching and cryogenic -70 to -80 DEG C, keep 3-4 hours, and then in the tempering treatment, the hardness of the tool or mould of cryogenic treatment than conventional heat treatment hardness 1-3HRC. Parts with complex shape and size changes in the larger, cryogenic treatment has the production of cracking risk.
    The nitriding treatment of 1.2379 steel:
The mold or the workpiece after nitriding treatment, surface layer with high hardness and corrosion resistance of the hardened layer.

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1.2344 tool steel category and application

    The 1.2344 tool steel correspond to USA H13 steel, it is air cooling hardening of hot work die steel and has been widely used in international. Compared with H11 steel, hot strength of H13 steel is higher, has the very good toughness, thermal fatigue resistance and some wear resistance at medium temperature. It is air quenched at lower austenitizing temperature, heat treatment deformation is small, surface oxidized probability is low, can resist the erosion effect of molten aluminum. Thermal crack is good, ESR steel, compact structure, electric furnace scouring, steel pure quality, with good to the performance.
    1.2344 steel is widely applied to the manufacture of hot extrusion die mandrel, die forging hammer mold, forging press mold, precision forging machine mould, die casting mould of aluminum and copper machine. Suitable for the manufacture of large or complex shape mould.

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What is the P20 mold material

     P20 mold material steel is a plastic die steel is widely used in the world. The good comprehensive mechanical property, high hardenability, can use a larger cross section of the steel to obtain a more uniform hardness, and has a polishing good performance, low surface roughness value. By using the P20 steel manufacturing mold, first quenching and tempering treatment, hardness of 28~35HRC, and then be made into mould after cold working, can be used directly. In this way, not only can ensure the mold using performance, and avoid the deformation caused by heat treatment of die.

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The uses of alloy steel aisi 4130

     Alloy steel aisi 4130 is a kind of chromium molybdenum alloy steel, it is often used in the following manufacturing field:
     1, the material is widely used in piston, screw, a transmission shaft, machine tool, spring, manufacture of injection mold for the push plate, a lock wedge, die set and reset rod, the push rod, the larger diameter core fixing board structure.
     2, 4130 steel also be used for transmission of motion and energy belt transmission, friction wheel transmission, key transmission, harmonic transmission, gear transmission, rope drive and spiral transmission and mechanical transmission, and the shaft parts, such as coupling, clutch and brake etc..

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