1.2714 Hot Work Tool Steel
Nickel hot work tool steel with good harden ability. Uniform hardness over section also at great dimensions. Resistance under impact loading. Very good strength and toughness. Good tempering resistance and dimensional stability. Tools can be water or air cooled.
Properties：
● Good impact toughness, high temperature resistance, wear resistance, heat fatigue resistance, size stability during heat treatment.
Applications：
● Suitable for all kinds of forging die, plastic die, hot shear blade, stamping die, backing plate, die seat, etc.
Parameters
| Grade | Chemical Composition (%) | |||||||||
C | Si | Mn | Cr | Ni | Mo | V | P | S | ||
GB | 5CrNiMo | 0.50~0.60 | ≦0.40 | 0.50~0.80 | 0.50~0.80 | 1.40~1.80 | 0.10~0.30 | - | ≦0.03 | ≦0.03 |
ASTM | L6 | 0.65~0.75 | 0.10~0.50 | 0.25~0.80 | 0.60~1.20 | 1.20~2.00 | ≦0.50 | - | ≦0.03 | ≦0.03 |
DIN | 1.2714 | 0.50~0.60 | 0.10~0.40 | 0.60~0.90 | 0.80~1.20 | 1.50~1.80 | 0.35~0.55 | 0.05~0.15 | ≦0.03 | ≦0.03 |
JIS | SKT4 | 0.50~0.60 | 0.10~0.40 | 0.60~0.90 | 0.80~1.20 | 1.50~1.80 | 0.35~0.55 | 0.05~0.15 | ≦0.03 | ≦0.02 |
Specification | Round BarØ (mm) | Flat Bar (mm) | ||||||||
Hot Rolled | Hot Forged | EAF | ESR | |||||||
Ø12~Ø50 | EAF | ESR | Thickness | 20~200 | 20~450 | |||||
Ø50~Ø250 | Ø50~Ø650 | width | 80~610 | 610max | ||||||
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
Soft Annealing
Heat to 650-700oC, 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 650oC, 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 830-870oC followed by oil quenching. Hardness after quenching is 58 HRC.
Air: Harden from a temperature of 830-900oC followed by air quenching. Hardness after quenching is 56 HRC.
Tempering
Quenching in oil:
Tempering Temperature (oC) vs. Hardness (HRC)vvs. Hardness (HRC) vs. Tensile Stregth (N/mm2)
100oC | 200oC | 300oC | 400oC | 450oC | 500oC | 550oC | 600oC | 650oC |
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)
100oC | 200oC | 300oC | 400oC | 450oC | 500oC | 550oC | 600oC | 650oC |
55 | 53 | 50 | 47 | 45 | 43 | 40 | 37 | 32 |
1980 | 1845 | 1680 | 1530 | 1440 | 1360 | 1260 | 1170 | 1020 |
Forging
Hot forming temperature: 1050-850oC
