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Specifications
Designation by Standards
| Mat. No. | DIN | EN | AISI |
| 1.2714 | 56NiCrMoV7 | 55CrMo8 | - |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.55 | 0.25 | 0.75 | 1.10 | 0.45 | 1.65 | 0.10 | - | - |
Description:
Nickel hot work tool steel with good hardenability. Uniform hardness over section also at great dimensions. Resistance under impact loadings. Very good strength and toughness. Good tempering resistance and dimensional stability. Tools can be water or air cooled.
Applications:
Forging tools, dies of all sorts, shapes and sizes, hot forging and pressing tools for steel and metal. Moulds, bushings, piercers etc.
Physical properties (average values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 215
Density [g/cm3]: 7.84
Thermal conductivity [W/m.K]: 36.0
Electric resistivity [Ohm mm2/m]: 0.30
Specific heat capacity[J/g.K]: 0.46
Thermal conductivity [W/m.K]
| 20°C | 500°C | 600°C |
| 36.0 | 36.8 | 36.0 |
Electric resistivity [Ohm mm2/m]
| 20°C | 500°C | 600°C |
| 0.30 | 0.70 | 0.84 |
Specific heat capacity[J/g.K]
| 20°C | 500°C | 600°C |
| 0.46 | 0.55 | 0.59 |
Coefficient of Linear Thermal Expansion 10ˉ6 °C-1
| 20-100°C | 20-200°C | 20-300°C | 20-400°C | 20-500°C | 20-600°C | 20-700°C |
| 11.7 | 12.1 | 13.0 | 13.5 | 14.0 | 14.3 | 14.6 |
Soft Annealing:
Heat to 650-700°C, cool slowly in furnace. This will produce a maximum Brinell hardness of 248.
Stress Relieving:
Stress relieving to remove machining stresses should be carried out by heating to 650°C, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening:
Oil: Harden from a temperature of 830-870°C followed by oil quenching. Hardness after quenching is 58 HRC.
Air: Harden from a temperature of 830-900°C followed by air quenching. Hardness after quenching is 56 HRC.
Tempering:
Tempering temperature: See the data bellow.
Quenching in oil
Tempering Temperature (°C) vs. Hardness (HRC)vvs. Hardness (HRC) vs. Tensile Stregth (N/mm2)
| 100°C | 200°C | 300°C | 400°C | 450°C | 500°C | 550°C | 600°C | 650°C |
| 57 | 55 | 52 | 49 | 47 | 45 | 42.5 | 39 | 35 |
| 2140 | 1980 | 1790 | 1620 | 1530 | 1440 | 1345 | 1230 | 1110 |
Quenching in air:
Tempering Temperature (oC) vs. Hardness (HRC) vs. Hardness (HRC) vs. Tensile Stregth (N/mm2)
| 100°C | 200°C | 300°C | 400°C | 450°C | 500°C | 550°C | 600°C | 650°C |
| 55 | 53 | 50 | 47 | 45 | 43 | 40 | 37 | 32 |
| 1980 | 1845 | 1680 | 1530 | 1440 | 1360 | 1260 | 1170 | 1020 |
Forging:
Hot forming temperature: 1050-850°C.
Machinability:
Due to its abrasion resistant nature, machining in the hardened condition should be limited to finish grinding.
