1.2344

CHEMICAL COMPOSITION

C: 0.37-0.42

Si: 0.90～1.20

Mn: 0.30～0.50

P: ≤0.030

S: ≤0.030

Cr: 4.80～5.50

Mo: 1.20～1.50

V: 0.90～1.10

MECHANICAL PROPERTIES

Hardness: 48-52 HRC (Rockwell hardness)

Tensile strength: 1550-1850 MPa (MPa)

Yield strength: Its yield strength is usually 1400-1600 MPa

PHYSICAL PROPERTIES

Density: 7.31 g/cm³

Modulus of elasticity:

At 20°C, 212000 MPa

Shear modulus: 825000 MPa

Poisson's ratio: 0.288

Thermal conductivity: The thermal conductivity of 1.2344 changes at different temperatures, for example,

At 20°C, it is 36.0 W/(m·K)

At 100°C, it is 33.4 W/(m·K), and so on.

HEAT TREATMENT

Isothermal annealing: annealing temperature (850±10)°C, holding for 2 hours, cooling to (720±10)°C in the furnace, holding for 4 hours, cooling the furnace to below 500°C, air cooling after exiting the furnace, hardness ≤229HBW.

High temperature tempering: Tempering temperature (730 ±10)°C, heat preservation for 2 hours, furnace cooling to ≤500°C, air cooling after exiting the furnace.

Quenching and tempering: quenching temperature 850-880°C, oil cooling, hardness 50-52HRC; tempering temperature 580-640°C, air cooling out of the furnace, hardness 28-36HRC.

Pre-hardening treatment: heating temperature 860-900°C, oil cooling, tempering temperature 570-700°C, air cooling, tempering hardness 28-35HRC.

FORGING

Forging temperature range is 1050-850℃