The performance of the 1.2738 mould steel

    The 1.2738 mould steel is manufactured in accordance with German DIN standard, with relatively superior mechanical properties in similar grades of steel, and good processability, mainly used for the production of hot work die processing, where the most common of plastic mold. In addition, special pre the steel hard treatment make it in the factory when has better hardness, can remove the mold production and processing in the heat treatment of links, improve economic benefits.
    The main performance of the 1.2738 mould steel: Material uniform hardness; excellent polishing performance; excellent machining performance; pre-hardened plastic mold steel; may be subjected to nitriding; suitable surface treatment, such as: plated Cr.
    The physical properties of the 1.2738 steel (Sample Hardness: 340HBW, at room temperature and high temperature conditions):
1) Temperature: 20℃ / 200℃ / 400℃, a density 7.8g/cm, 7.75g/cm, 7.7g/cm.
2) Temperature: 20 ~ 200℃ / 20 ~ 400℃, linear expansion coefficient 12.6×10K / 13.5×10K.
3) Temperature: 20℃ / 200℃ / 400℃, the thermal conductivity 29W·(m·K) / 29.5W·(m·K) / 31W·(m·K).
4) Temperature: 20℃ / 200℃ / 400℃, the elastic modulus 205000MPa / 200000MPa / 185000MPa.
    The mechanical properties of the 1.2738 mould steel (sample hardness 340HBW):
1) Temperature: 20℃ / 200℃ / 400℃, tensile strength 1100MPa / 1050MP8 / 850MPa.
2) Temperature: 20℃ / 200℃ / 400℃, conditions yield strength 980MPa / 925MPa / 770MPa.
3) Temperature: 20℃ / 200℃ / 400℃, section shrinkage rate 49% / 51% / 52%.
4) Temperature: 20℃ / 200℃ / 400℃, an elongation 13% / 14% / 16%.
5) Temperature: 20℃ / 200℃ / 400℃, impact toughness (≥) 20J/cm, 32J/cm, 42J/cm.

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The introduction of the mold steel 1.2080 steel

     The mold steel 1.2080 steel is the German D1N standard material number, which corresponds to the Chinese GB standard grade CR12, Japanese JIS standard grade SKD1, U.S. AlSI / SAE standard grade D3. Mold steel 1.2080 steel is a kind of ledeburite steel with high carbon and chromium. It has a high abrasion resistance, hardenability, hardenability, toughness, thermal stability, compressive strength, micro-deformation and excellent overall performance, has good machining and thermal oxidation resistance, wide adaptability. Has a high abrasion resistance, is 3 to 4 times of the general low alloy tool steel. The small deformation hardening.
     Mold steel 1.2080 steel isothermal spheroidizing annealing specification: (850 ~ 870) ℃ × (3 ~ 4) h, with the furnace cooling, (740 ~ 760) ℃ × (4 ~ 5) h isothermal, cooled baked, hardness temperature ≤241HBS, eutectic carbides ≤3 level.
     Ordinary quenching specification: Temperature 950 ~ 1150 ℃, oil quenching, quenching hardness ≥60HRC.
     The 1.2080 steel can be used to make cold working mold of complex shape and working conditions complex. Such as Die punch, thread rolling dies, drawing dies, die cutting, powder metallurgy die, woodworking cutting tools, cold cutting scissors drill sleeve and gauge tool.

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Introduction of structural steel 4130 steel

    The structural steel 4130 steel with high strength and toughness, high hardenability. In the oil, the critical quenching diameter 15 ~ 70mm. The structural steel 4130 steel hot strength is also good, at below 500 ℃ with a sufficiently high temperature strength, But the strength was significantly decreased at 550 ℃. When the lower limit of the content of alloying elements, the welding is quite good, but the content of alloying elements is close to the upper limit, the welding performance medium.  And the need to preheat to 175 ℃ above before welding. Good machinability of the 4130 steel, cold deformation plasticity medium. When the heat treatment, has a first temper brittleness in the range of 300 ~ 350 ℃, may form white spots.
    The structural steel 4130 steel is typically used in quenched and tempered condition. In medium-sized machinery manufacturing industry mainly for the manufacture of large cross-section, parts working under high stress conditions, such as shafts, spindles and steering wheel to withstand high loads, bolts, studs, and other gear. In the chemical industry for the manufacture of welded parts, welded structure consisting of plates and pipes. For the manufacture high-pressure pipe at containing nitrogen and hydrogen media work and the temperature does not exceed 250 ℃. Fasteners used in steam turbines, boilers manufactured manufacturing work below 450 ℃, below 500 ℃ under high pressure flange and flange cover.

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The performance of AISI D2 tool steel

     The wear resistance of AISI D2 tool steel is high, small deformation, the carbon content as high as 1.5%, chromium content up to 11.5%. After heat treatment, the hardness of D2 steel is up to 60HRC, but its ductility, toughness, resistance to rust ability are relatively weak, steel surface to mirror polished is not easy.
     Along with the cold stamping products to the development of high precision and high efficiency, multi species, requirement of die steel has good abrasion resistance and toughness. Compared with Cr12MoV steel, the D2 steel has increased by Mo and V in chemical composition, changing the cast structure of steel, improve the morphology of ledeburite, its strength and toughness and wear resistance is better than that of Cr12MoV steel, improve the service life of mould.
     The yield point and plastic deformation resistance of AISI D2 tool steel is higher than Cr12MoV steel, so the forging properties and thermal plastic forming is slightly worse than Cr12MoV. Cr12MolV, American D2, Japan SKD11, three although the same chemical composition, but the performance difference is very big. After heat treatment, Cr12MolV color slightly orange red, deformation is very large, prone to fatigue fracture at actual use; D2 steel is cold white color, hardness higher than SKD11, the toughness is lower than SKD11, high stress is easy to appear the tiny gap; SKD11 bright luster and the best overall performance.

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The casting properties of mould steel 1.2344

     Since the mould steel 1.2344 is a kind of multi element composite medium carbon alloy steel, it's contains more alloy elements Mo、V、Cr, make the solidification temperature of liquid alloy decreased, resulting in the crystallization temperature range increases, the casting performance is poorer. The following two tables are the mobility and linear shrinkage of 1.2344 steel. Tests showed, 1.2344 steel pouring temperature control in 1 530 ~ 1 630 ℃ is appropriate, its linear shrinkage be similar to ordinary carbon steel. By the electroslag remelting process can decrease the solidification temperature interval, improve the inner quality of 1.2344 mould steel, improve the toughness of casting mould.

Mobility
Casting type Pouring temperature/°C Overheating temperature/°C Helix length/mm
Sand mold 1530 70 260
Sand mold 1588 128 350
Sand mold 1670 210 475
Sand mold 1700 240 760

Linear shrinkage(%)
Projeck Parameter
Free shrinkage 1.68
Blocked shrinkage 1.29

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The characteristics of alloy structure steel 4340

     Alloy structure steel 4340 has high strength, high toughness and good hardenability. When hardened reaches half martensite hardness (HRC45), water quenching critical quenching diameter for Φ ≥100mm, critical quenching oil quenching diameter for Φ ≥75mm; when hardened to 90% martensite, water quenched critical diameter for Φ 80 ~ 90mm, oil quenched critical diameter for Φ 55 ~ 66mm. AISI 4340 alloy steel has anti-overheating and stability, but the white spot high sensitivity, temper brittleness, poor welding, high temperature preheating before welding, eliminate stress after welding.
     The main purpose of alloy structure steel 4340: manufacture of turbine gears, gear ring, the whole forging rotor. Engine connecting rods, valve. High strength, high toughness, a greater cross-sectional size forgings such as forged part of wind generator, drive eccentric shaft of horizontal type forging machine, crankshaft of forging machine etc.. Automobile, airplane special wear-resistant parts etc..

 


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