VDM® Alloy 926

VDM® Alloy 926

VDM® Alloy 926 introduction

1.4529 (X1NiCrMoCuN25-20-7) is an austenitic, special stainless steel that was developed by VDM Metals on the basis of the many times proven VDM® Alloy 904 L (1.4539). Due to its 6.5 % higher molybdenum concentration, VDM® Alloy 926 has a generally improved corrosion resistance and resistance against pitting corrosion and crevice corrosion compared to VDM® Alloy 904 L. This also has a positive effect on the resistance against stress corrosion that is induced by pitting corrosion. It is characterized by the following features and properties:

Very good resistance against chloride-induced stress corrosion
Increased resistance against stress corrosion in comparison to other austenitic stainless steels
Excellent general corrosion resistance when in contact with oxidizing and reducing media
Higher strength than VDM® Alloy 904 L (1.4539)
Low propensity to form inter-metallic phases
Approval for pressure vessels in the temperature range from -196 to 400°C
Approval from building supervisory authorities for components and joining elements made of stainless steels,
Deutsches Institut für Bautechnik [German Centre of Competence for Construction], September ’98

Equivalent material: DIN 1.4529, EN 1.4529, DIN X1NiCrMoCuN25-20-7, EN X1NiCrMoCuN25-20-7, UNS N08926

VDM® Alloy 926 general

Property Temperature Value
Density 23.0 °C Density of 8.1 g/cm³

VDM® Alloy 926 thermal

Property Temperature Value
Coefficient of thermal expansion 100.0 °C Coefficient of thermal expansion of 1.5E-5 1/K
- 200.0 °C Coefficient of thermal expansion of 1.57E-5 1/K
- 300.0 °C Coefficient of thermal expansion of 1.61E-5 1/K
- 400.0 °C Coefficient of thermal expansion of 1.64E-5 1/K
Melting point - Melting point of 1320 - 1390 °C
Specific heat capacity 20.0 °C Specific heat capacity of 415 J/(kg·K)
- 100.0 °C Specific heat capacity of 435 J/(kg·K)
- 200.0 °C Specific heat capacity of 470 J/(kg·K)
- 300.0 °C Specific heat capacity of 495 J/(kg·K)
- 400.0 °C Specific heat capacity of 510 J/(kg·K)
Thermal conductivity 20.0 °C Thermal conductivity of 12 W/(m·K)
- 100.0 °C Thermal conductivity of 12.9 W/(m·K)
- 200.0 °C Thermal conductivity of 14.4 W/(m·K)
- 300.0 °C Thermal conductivity of 16.5 W/(m·K)
- 400.0 °C Thermal conductivity of 18.5 W/(m·K)

VDM® Alloy 926 chemical

Property Value Comment
Carbon Carbon of 0.02 % max.
Chromium Chromium of 20 - 21 % -
Copper Copper of 0.5 - 1.5 % -
Iron -
Manganese Manganese of 1 % max.
Molybdenum Molybdenum of 6 - 7 % -
Nickel Nickel of 24 - 26 % -
Nitrogen Nitrogen of 0.15 - 0.25 % -
Phosphorus Phosphorus of 0.03 % max.
Silicon Silicon of 0.5 % max.
Sulfur Sulfur of 0.01 % max.

VDM® Alloy 926 magnetic

Property Temperature Value
Relative magnetic permeability 23.0 °C Relative magnetic permeability of 1 [-]

VDM® Alloy 926 electrical

Property Temperature Value
Electrical resistivity 20.0 °C Electrical resistivity of 9.6E-7 Ω·m
- 100.0 °C Electrical resistivity of 9.9E-7 Ω·m
- 200.0 °C Electrical resistivity of 1.04E-6 Ω·m
- 300.0 °C Electrical resistivity of 1.08E-6 Ω·m
- 400.0 °C Electrical resistivity of 1.12E-6 Ω·m

VDM® Alloy 926 mechanical

Property Temperature Value Comment
Elastic modulus 20.0 °C Elastic modulus of 193 GPa -
- 100.0 °C Elastic modulus of 186 GPa -
- 200.0 °C Elastic modulus of 179 GPa -
- 300.0 °C Elastic modulus of 173 GPa -
- 400.0 °C Elastic modulus of 168 GPa -
Elongation A50 23.0 °C Elongation A50 of 35 % Typical mechanical properties for sheet, plate, strip, rod and bar
Impact strength, Charpy notched -196.0 °C Impact strength, Charpy notched of 1250 kJ/m² -
- 20.0 °C Impact strength, Charpy notched of 1500 kJ/m² -
Tensile strength 23.0 °C Tensile strength of 650 MPa Typical mechanical property for sheet, plate, strip, rod and bar
Yield strength Rp0.2 20.0 °C Yield strength Rp0.2 of 300 MPa Typical mechanical properties
- 100.0 °C Yield strength Rp0.2 of 230 MPa Typical mechanical properties
- 200.0 °C Yield strength Rp0.2 of 190 MPa Typical mechanical properties
- 300.0 °C Yield strength Rp0.2 of 170 MPa Typical mechanical properties
- 400.0 °C Yield strength Rp0.2 of 160 MPa Typical mechanical properties
- 500.0 °C Yield strength Rp0.2 of 120 MPa Typical mechanical properties
- 550.0 °C Yield strength Rp0.2 of 105 MPa Typical mechanical properties
Yield strength Rp1.0 20.0 °C Yield strength Rp1.0 of 340 MPa Typical mechanical properties
- 100.0 °C Yield strength Rp1.0 of 270 MPa Typical mechanical properties
- 200.0 °C Yield strength Rp1.0 of 225 MPa Typical mechanical properties
- 300.0 °C Yield strength Rp1.0 of 205 MPa Typical mechanical properties
- 400.0 °C Yield strength Rp1.0 of 190 MPa Typical mechanical properties
- 500.0 °C Yield strength Rp1.0 of 150 MPa Typical mechanical properties
- 550.0 °C Yield strength Rp1.0 of 135 MPa Typical mechanical properties

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