About H13 hot work tool steel hardness

    Carbon content determines the hardness of quenched steel substrate of H13 hot work tool steel. According to the curve of relationship between carbon content and hardness of hardened steel in steel, we can know that the quenching hardness of H13 die steel at about 55HRC. For tool steel, a part of carbon into the steel matrix caused by solid solution strengthening the other part of the carbon and alloying element carbides combine to form alloy carbides. For H13 mould steel, this kind of alloy carbides in addition to a small amount of residual, and need it is precipitates in the quenched martensite matrix in the process of tempering, have twice of hardening. Thus the residual alloy carbon compounds and tempered martensite uniform distribution of tissues to determine the performance of hot work die steel.

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The corresponding grade of D2 cold work steel

The corresponding grade of D2 cold work steel:
China GB standard steel grade Cr12Mo1V1,
American ASTM/UNS standard steel grade D2/T30402,
International Organization for Standardization ISO standard steel grade 160CrMoV12,
French NF standard steel 160CrMoV12,
British BS standard steel grade BD2,
Japan JIS standard steel grade SKD11,
Japan HITACHI standard steel grade SLD,
Japan DAIDO standard steel grade DC11,
Japan NAXHI standard steel grade CDS11,
German DIN standard material number 1.2379 steel,
German DIN standard steel grade X155 CrMoV12-1,
Austria BOHLER standard steel grade K110,
Sweden ASSAB standard steel grade XW-41.

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The characteristics of high chromium steel 1.2080

    The high chromium steel 1.2080 is high carbon high chromium type ledeburite, carbon content up to 2%, so the impact toughness is poor, easy to rattle, and easy to form uneven eutectic carbides. There are a lot of elements Cr in 1.2080 steel, mainly formed 7C3 compounds (Cr·Fe), and carburizing type carbide are very few.
    A lot of carbonization logistics into austenite when quenching. After quenching martensite with high hardness. A large amount of dispersed carbides precipitation from martensite after tempering. Because of its hardness is very high, thus improves the wear resistance of steel, Cr and the isothermal transformation curve shifts to the right, thus increase the hardenability of steel. Martensitic transformation point is low, there is a lot of mold steel retained austenite after quenching, reduces the deformation of the mold quenching. High-carbon high chromium 1.2080 steel, with high hardenability, less deformation hardening, high hardness, good wear resistance.

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How to adjust the hardness of alloy steel aisi 4140 products

The alloy steel aisi 4140 products hardness adjustment methods are as follows:
Quenching + tempering: 840 ± 10 °C quenching in water or oil (depending on the complexity of the product shape), 680-700 °C tempering. HB <217.
Quenching + tempering: 840 ± 10 °C oil quenching, then 470 °C tempered. HRC41-45.
Quenching + tempering: 840 ± 10 °C oil quenching, then 480 °C tempered. HRC35-45.
Quenching + tempering: 850 °C oil quenching, then 510 °C tempering. HRC38-42.
Quenching + tempering: 850 °C oil quenching, then 500 °C tempering. HRC40-43.
Quenching + tempering: 850 °C oil quenching, then 510 °C tempered. HRC36-42.
Quenching + tempering: 850 °C oil quenching, then 560 °C tempered. HRC32-36.
Quenching + tempering: 860 °C oil quenching, then 390 °C tempering. HRC48-52.
Softening annealing specification:
Annealing temperature 680 ~ 700 °C, slow cooling in the furnace, the hardness ≤217HBW.
4140 steel quenching and tempering specification:
Quenching temperature 830 ~ 860 °C, oil-cooling or 180 ~ 220 °C salt bath cooling, hardness 52HRC, strength 1780MPa.
Tempering temperature: 100 °C / 200 °C / 300 °C / 400 °C / 500 °C / 600 °C, the hardness of 50HRC / 49HRC / 46HRC / 42HRC / 36HRC / 28HRC.

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What are the uses of DIN 1.2379 cold work steel

     DIN 1.2379 cold work steel is a high carbon high chromium alloy tool steel. After heat treatment has very high hardness and abrasion resistance, and the hardenability is strong, good size stability.
     Used for the production of a variety of silicon steel sheet of high speed blanking die.
     Used in precision stamping dies, cold extrusion die, drawing die, blanking die.
     Used for cutting sheet material efficient scissors, deep drawing die and tube drawing die.
     1.2379 steel is used for the complex and easy deformation mould. High wear resistance and long service life of cold punching mould.
     Used for the excellent wear resistance and good toughness cold working die, can be used for embossing dies, cold forging die.
     Used for heavy stamping die, cold shear blade, thread rolling die etc..
     DIN 1.2379 cold work steel is used for cold heading dies, pottery clay mold etc..
     Used for wear-resistant plastic mould.

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How to eliminate the stress of 1.2344 steel parts

     After rough machining, sensitive or large processing capacity of 1.2344 steel parts, also must carry on stress-relief annealing processing, to eliminate processing stress and straightening stress. Because the stress can cause not to allow change in size, deformation and cracks in quenching process.
     Eliminate stress slowly heating in the low temperature (about 100~150K/h), highest do not exceed 300 degrees C. It is best to use the electric heating furnace with program control and circulating air. After heating, the furnace can also control slow cooling, does not require special protective measures to prevent annealing 1.2344 steel oxide skin or surface damage occurs.

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What are the characteristics of mould steel AISI P20

     P20 steel is suitable for making the plastic mold and die casting mould of low melting point metal.
     The physical properties of mould steel AISI P20 with uniform hardness, good polishing performance and light etching performance. And excellent processing properties of P20 die steel. Therefore it is suitable for TV former shell, telephone, water dispenser, vacuum cleaners and other plastic mould.
     The P20 die steel with high purity by vacuum degassing refining  treatment, more suited to the requirements of polish or etch processing of plastic mold. Such as: TV cabinet, refrigerator inner shell etc..
     P20 die steel pre hardened 285-330HB (30-36HRC), no need of heat treatment can be directly used for molding processing, greatly shortens the construction period, saving its operating costs. And P20 steel has the characteristics of good size stability, pre hardened steel can meet the general use of demand, the service life of the die is 50W mode. Applicable to thermoplastic plastic injection mold, extrusion mold.
     P20 die steel microstructure is compact after the rolling process. You can found P20 mould steel without small hole defects by ultrasonic inspection. So it can be used to make good sealing mould, such as washing machines, buckets, and so on.

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