1.4748, DIN X85CrMoV18-2

1.4748, DIN X85CrMoV18-2

Designation by Standards

 

Chemical Composition (in weight %)

Description
The martensitic chromium-molybdenum-vanadaium steel PK329 is corrosion and heat resistant, and it has good mechanical properties at operating temperatures up to 700^oC. This steel has good wear resistance.

Applications
Intake valves for heavy duty engines and exhaust valves for medium service requirements. Valve seat inserts.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 226
Density [g/cm³]: 7.7
Thermal conductivity [W/m.K]: 21.0
Electric resistivity [Ohm mm²/m]: 0.65
Specific heat capacity[J/g.K]: 0.50
Magnetisable: Yes

Coefficient of Linear Thermal Expansion 10^{-6 o}C^-1

Soft Annealing
Heat to 820-860^oC, cool slowly in air.

Hardening
Harden from a temperature of 1050-1080^oC followed by oil quenching.

Tempering
Tempering temperature: 700-750^oC

Mechanical properties at at ambient temperature

Condition: Tempered
Hardness: 355 HB
0.2% proof stress: 800 N/mm²
Tensile strength: 1000-1200 N/mm²
Elongation: 7%
Reduction: 12%

Condition: Hardened
Hardness: 296 HB
0.2% proof stress: 800 N/mm²
Tensile strength: 1000-1200 N/mm²
Elongation: 7%
Reduction: 12%

0.2% Proof Stress in N/mm² vs. Temperature in ^oC

Tensile Strength in N/mm² vs. Temperature in ^oC

Forging
Hot forming temperature: 1100-900^oC, slow cooling.

Machinability
No data.

Corrosion Resistance
Good hot corrosion and oxidation resistance up to 750^oC, also in presence of combustion gases from aggressive fuels.