1.4913*, DIN X19CrMoVNbN11-1

1.4913*, DIN X19CrMoVNbN11-1

 Designation by Standards

 

Chemical Composition (in weight %)

Description
PK323 is a creep-resistant material that is generally used for temperatures up to 600^oC.

Applications
Application area: For fastening elements in thermal energy plants, screws, nuts.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 216, 200 (200^oC), 179 (400^oC), 127 (600^oC)
Density [g/cm³]: 7.7
Thermal conductivity [W/m.K]: 29.5
Electric resistivity [Ohm mm²/m]: 0.60
Specific heat capacity[J/g.K]: 0.46
Magnetisable: Yes

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

Annealing
Heat to 670-720^oC, min. 2 hours. Structure is martensite.

Quenching
Harden from a temperature of 1100-1130^oC followed by air or oil quenching.

Mechanical properties at at ambient temperature
Condition: Quenched and tempered, d<=160 mm
0.2 % proof stress: 750 N/mm²
Tensile strength: 900-1050 N/mm²
Elongation: 12%
Reduction: 40%
Charpy notch (ISO-V): 20 J (Longit.)

0.2 % Proof Stress in N/mm² vs. Temperature in ^oC
Thickness <=160 mm, QT Condition

Mecahnical properties at elevated temperatures

1% Creep Stress in N/mm² vs. Temperature in ^oC

Creep Rupture Stress in N/mm² vs. Temperature in ^oC

Forging
Hot forming temperature: 1100-850^oC, slow cooling.

Machinability
Metal cutting machining is teh same as that for special engineering steel grades of corresponding strength.

Welding
PK323 should not be welded.

Note: Quenching and tempering treatment must always be carried out after hot forming.