Designation by Standards

1.2714 56NiCrMoV7 † 55NiCrMoV7 - / /

Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.55 0.25 0.75 1.10 0.50 1.70 0.10 - -

Nickel hot work tool steel with good hardenability. Uniform hardness over section also at great dimensions. Resistance under impact loadings. Very good strength and thougness. Good tempering resistance and dimensional stability. Tools can be water or air cooled.

Forging tools, dies of all sorts, shapes and sizes, hot forging and pressing tools for steel and metal. Moulds, bushings, piercers etc.

Physical properties (avarage 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]

20oC 500oC 600oC
36.0 36.8 36.0

Electric resistivity [Ohm mm2/m]

20oC 500oC 600oC
0.30 0.70 0.84

Specific heat capacity[J/g.K]

20oC 500oC 600oC
0.46 0.55 0.59

Coefficient of Linear Thermal Expansion 10-6 oC-1

20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 20-600oC 20-700oC
11.7 12.1 13.0 13.5 14.0 14.3 14.6

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.

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 temperature: See the data bellow.

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

Hot forming temperature: 1050-850oC.

The machinability rating of D3 is roughly 25 % that of free machining carbon steel 1018. Due to its abrasion resistant nature, machining in the hardened condition should be limited to finish grinding.

All technical information is for reference only.