What are the characteristics of the DIN 1.2738 Tool Steel

    DIN 1.2738 Tool Steel with high hardenability, and good polishing performance, the electric spark machining properties and processing properties of dermatoglyphics. Has been pre hard, don't need to be hardened, suitable for electric spark machining and mirror polishing, good comprehensive mechanical property, its hardness can be increased again to >40HRC.
    1.2738 steel can also be used nitriding, boronizing and other chemical heat treatment, the hardness of the surface after treatment can be increased from 370 ~420HV to 1000HV, the wear resistance and corrosion resistance was significantly improved, the mold may be chrome plated. Die local damage can be used welding method to repair, welding quality is good, can be processed. In the pre-hard state to use, to prevent heat distortion.

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The effect of alloy elements in AISI 4340 round steel

    4340 steel is quenched and tempered steel typical chromium nickel. Because chromium and nickel cooperate, can make the hardenability of the steel is greatly improved, the cross-sectional area of less than 80mm of AISI 4340 round steel can be fully hardened when the oil quenching.
    Nickel alloy elements do not form carbides. Nickel role is when the increase of the content, can increase the strength of steel, and has a good effect on the plasticity and toughness of steel, especially the low temperature impact toughness of high.
    AISI 4340 steel adding chromium and nickel, in addition to enhance the effect of Cr, good effect can also keep nickel, obtain high mechanical properties of. The interaction of chromium and nickel, makes the hardenability of the steel increased much, far more than the role of a single element.
    AISI 4340 steel while joining the 0.15%~0.25%Mo, in order to eliminate the sensitivity of steel on the temper brittleness, but adding quantity is not large, so the high temperature tempering still cooling in water or oil.

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Application of H13 die steel in hot forging die

     The hot forging die usually work in abominable conditions. Need to bear high temperature, high pressure, and some also bear greater impact force. So forging hot die there should be a higher the high temperature strength, thermal fatigue resistance and impact toughness. H13 die steel have higher the high temperature strength, hardness and impact resistance, very suitable for hot forging die.
     In the 1980s, H13 steel be used for hammer forging die, friction screw press forging die, hot die forging press forging die and other in Europe and the United States and japan. China from the beginning of the 1990s, there are some large machinery  factory using H13 steel manufacturing high-speed hammer forging die for the production of gears and blades and the general small and medium-sized forging die, all with satisfactory results.

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The quenching hardness of cold work D2 die steel

     The quenching hardness of cold work D2 die steel is mainly related with temperature and heat preservation time. D2 steel transformed into austenite above 950 °C, the quenching hardness reaches above 52HRC. The hardness of D2 steel and transformed into austenite temperature after quenching has a great relationship with the heat preservation time. In 1010 ~ 1040 °C transformed into austenite, when the holding time is 20min, the hardness value is higher, which reached a maximum hardness 64HRC at 1010 °C. In the same austenitizing temperature, after heat preservation 40min, as the heat preservation time increases, D2 steel hardness declining, which is because the carbides dissolution, resulting in carbon content increased in austenite matrix, thereby reducing Ms point, residual austenite increases after quenching.

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The model number of 1.2080 mould steel in other countries

The 1.2080 mould steel corresponds to other countries steel grade as follows:
Chinese GB standard grades Cr12,
German DIN standard grades X210Cr12,
British Standard BS grades BD3.,
French AFN0R standard grades Z200Cr12,
Italian UNI Standard Grade X210Cr13KU / X250Cr12KU,
Spanish UNE standard grades X210Cr12,
Japanese JIS standard grades SKD1,
China Taiwan CNS standard grades 5KD1,
Korea KS standard grades STD1,
American AISI / SAE Standard Grade D3,
International Organization for Standardization (IS0) standard grades 210Cr12,
Russia R0CT Standard Grade X12.
The 1.2080 steel is the German DIN standard steel material number.

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The reason of quenching crack of 4140 steel plate

     According to the actual production situation, we believe that the main reason of quenching crack of 4140 steel plate is:
     If the use of water as quenching medium, 4140 steel cooling speed is faster at high temperature range, but the cooling speed is slow at low temperature range lower than the Ms temperature. The water temperature rises, the cooling ability decreased at the high temperature range, but the cooling capacity almost unchanged at the low temperatures. When the 4140 steel is cooled to below Ms temperature, martensite phase transition, volume expansion, have second kinds of distortion, second kinds of stress, and the macro structure stress and thermal stress, so prone to quenching crack.
     If the cooling rate is too fast will produce tissue stress when the tempering, lead to 4140 steel generate longitudinal crack.
     The annular crack of steel edge is because of edge nonuniform chamfer lead to stress concentration when quenching.

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What are the properties of 1.2379 tool steel

     The 1.2379 tool steel high carbon and high chromium cold work die steel, be widely used in the international. It is a kind of ledeburite steel, with high hardenability, hardening capacity and high wear resistance; oxidation resistance is good at high temperature, anti rust ability is good after quenching and polishing, the amount of deformation is small after heat treatment. High carbon, high chromium type ledeburite steel, if no special requirements, do not need to add cobalt. The content of molybdenum and vanadium are higher than the 1.2601 steel, so the steel microstructure and grain size of further refinement, increase the hardenability, the strength and toughness of steel, the better comprehensive properties of the steel.
     1.2379 steel used for the manufacturing requirements of high wear resistance of large die complicated cold, such as cold cutting, trimming die, drawing die, screw plate, thread rolling die, binding mode and requirement of high wear-resistant die and punch.

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What are the advantages of 1.2344 ESR steel

     1.2344 ESR steel is use of ESR to smelting, so it has a very high purity, macroscopic and microscopic uniformity is also high.
     When the sulfur content is lower than 0.005%, the transverse toughness becomes high.
     Special smelting method makes the alloy elements distribution is very uniform, can also form a uniform annealing microstructure with globular carbide.
     The maximum tempering hardness is 229HB.
     The 1.2344 steel need good thermally processed to obtain a uniform quenched and tempered tissue, so that the mechanical properties isotropic.
     The steel is made mould can resist the formation and propagation of cracks, especially produced thermal stress when temperature changes.

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