5CrMnMo

CHEMICAL COMPOSITION

C: 0.5-0.6

Si: 0.25-0.60

Mn: 1.2-1.6

P: ≤0.03

S: ≤0.03

Ni: 1.4-1.8

Cr: 0.6-0.9

Mo: 0.15-0.30

MECHANICAL PROPERTIES

Proof strength Rp0.2(MPa): 925(≥)

Tensile strength Rm(MPa): 381(≥)

Impact energy KV(J): 11

Elongation at fracture A(%): 11

Reduction in cross section on fractur Z(%): 32

As-Heat-Treated Condition: Solution and Aging, Annealing, Ausaging, Q+T

Brinell hardness(HBW): 123

PHYSICAL PROPERTIES

Property: 756(≥)

Density kg/dm3: 372(≥)

Temperature T°C/F: 33

Specific heat J/kgK: 43

Thermal conductivity W/mK: 12

Temp.°C/°F: 881

Creep strain limit(10000h)(Rp1,0)N/mm2: 267

Creep rupture strength (10000h)(Rp1,0)N/mm2: 836

Electric resistance µΩ·cm: Solution and Aging, Annealing, Ausaging, Q+T

Modulus of elasticity kN/mm2: 331

HEAT TREATMENT

Annealing: heat at 760-780℃ and keep it for 150 min, cool to 500℃, and then air-cool.

Quenching:

After heating and holding at 650°C for 80 minutes, heat and hold at 850°C for 150 minutes to oil cooling (oil temperature around 40°C) to room temperature.

Three Temperings:

For the first time, heat and hold at 500℃ for 3h, and cool to room temperature in air.

For the second time, heat and keep at 450℃ for 4h, and cool to room temperature in air.

For the third time, heat and keep at 300℃ for 5h to cool to room temperature.

In this way, the hardness can reach about HRC43, which has good edge crack resistance and prolongs the service life of the mold.