Sandvik 8R40

Sandvik 8R40

Sandvik 8R40 introduction

Sandvik 8R40 is an austenitic, niobium-stabilized stainless chromium-nickel steel for use at temperatures up to 850°C (1560°F).

Datasheet URL:
Sandvik 8R40

Datasheet updated 2019-09-02 09:20 (supersedes all previous editions)

Equivalent material: UNS S34700, UNS S34709, ASTM TP347, ASTM TP347H, EN 1.4550, EN 1.4912, EN X6CrNiNb18-10, EN X7CrNiNb18-10, DIN 1.4550, DIN X6CrNiNb18-10, SS 2338, AFNOR Z6CNNb18-10, BS 347S31, BS 347S51

Sandvik 8R40 general

Property Temperature Value Comment
Density 23.0 °C Density of 7.9 g/cm³ -
Recycled Content - Recycled Content of 82.1 % Average recycled content

Sandvik 8R40 thermal

Property Temperature Value Comment
Coefficient of thermal expansion 100.0 °C Coefficient of thermal expansion of 1.7E-5 1/K for 30°C to the mentioned temperature
- 200.0 °C Coefficient of thermal expansion of 1.75E-5 1/K for 30°C to the mentioned temperature
- 300.0 °C Coefficient of thermal expansion of 1.75E-5 1/K for 30°C to the mentioned temperature
- 400.0 °C Coefficient of thermal expansion of 1.8E-5 1/K for 30°C to the mentioned temperature
- 500.0 °C Coefficient of thermal expansion of 1.85E-5 1/K for 30°C to the mentioned temperature
- 600.0 °C Coefficient of thermal expansion of 1.85E-5 1/K for 30°C to the mentioned temperature
- 700.0 °C Coefficient of thermal expansion of 1.9E-5 1/K for 30°C to the mentioned temperature
- 800.0 °C Coefficient of thermal expansion of 1.95E-5 1/K for 30°C to the mentioned temperature
- 900.0 °C Coefficient of thermal expansion of 1.95E-5 1/K for 30°C to the mentioned temperature
- 1000.0 °C Coefficient of thermal expansion of 2E-5 1/K for 30°C to the mentioned temperature
Specific heat capacity 20.0 °C Specific heat capacity of 485 J/(kg·K) -
- 100.0 °C Specific heat capacity of 500 J/(kg·K) -
- 200.0 °C Specific heat capacity of 515 J/(kg·K) -
- 300.0 °C Specific heat capacity of 525 J/(kg·K) -
- 400.0 °C Specific heat capacity of 540 J/(kg·K) -
- 500.0 °C Specific heat capacity of 555 J/(kg·K) -
- 600.0 °C Specific heat capacity of 575 J/(kg·K) -
Thermal conductivity 23.0 °C Thermal conductivity of 14 W/(m·K) -
- 100.0 °C Thermal conductivity of 15 W/(m·K) -
- 200.0 °C Thermal conductivity of 17 W/(m·K) -
- 300.0 °C Thermal conductivity of 18 W/(m·K) -
- 400.0 °C Thermal conductivity of 20 W/(m·K) -
- 500.0 °C Thermal conductivity of 21 W/(m·K) -
- 600.0 °C Thermal conductivity of 23 W/(m·K) -

Sandvik 8R40 chemical

Property Value Comment
Carbon Carbon of 0.06 % max.
Chromium Chromium of 17.5 % -
Iron -
Manganese Manganese of 1.8 % -
Nickel Nickel of 11 % -
Niobium Niobium of 0.6 % min. (Nb>10xC)
Phosphorus Phosphorus of 0.04 % max.
Silicon Silicon of 0.4 % -
Sulfur Sulfur of 0.015 % max.

Sandvik 8R40 mechanical

Property Temperature Value Comment
Charpy impact energy -196.0 °C Charpy impact energy of 60 J EN 13445-2 (UFPV-2) and EN 10216-5
Creep strength 10^4 cycles 540.0 °C Creep strength 10^4 cycles of 253 MPa ISO values, at 10000h
- 550.0 °C Creep strength 10^4 cycles of 237 MPa ISO values, at 10000h
- 580.0 °C Creep strength 10^4 cycles of 192 MPa ISO values, at 10000h
- 600.0 °C Creep strength 10^4 cycles of 166 MPa ISO values, at 10000h
- 620.0 °C Creep strength 10^4 cycles of 142 MPa ISO values, at 10000h
- 650.0 °C Creep strength 10^4 cycles of 112 MPa ISO values, at 10000h
- 670.0 °C Creep strength 10^4 cycles of 96 MPa ISO values, at 10000h
- 700.0 °C Creep strength 10^4 cycles of 74 MPa ISO values, at 10000h
- 800.0 °C Creep strength 10^4 cycles of 28 MPa ISO values, at 10000h
Creep strength 10^5 cycles 540.0 °C Creep strength 10^5 cycles of 186 MPa ISO values, at 100000h
- 550.0 °C Creep strength 10^5 cycles of 172 MPa ISO values, at 100000h
- 580.0 °C Creep strength 10^5 cycles of 135 MPa ISO values, at 100000h
- 600.0 °C Creep strength 10^5 cycles of 115 MPa ISO values, at 100000h
- 620.0 °C Creep strength 10^5 cycles of 97 MPa ISO values, at 100000h
- 650.0 °C Creep strength 10^5 cycles of 74 MPa ISO values, at 100000h
- 670.0 °C Creep strength 10^5 cycles of 61 MPa ISO values, at 100000h
- 700.0 °C Creep strength 10^5 cycles of 48 MPa ISO values, at 100000h
- 800.0 °C Creep strength 10^5 cycles of 16 MPa ISO values, at 100000h
Elastic modulus 20.0 °C Elastic modulus of 200 GPa -
- 100.0 °C Elastic modulus of 194 GPa -
- 200.0 °C Elastic modulus of 186 GPa -
- 300.0 °C Elastic modulus of 179 GPa -
- 400.0 °C Elastic modulus of 172 GPa -
- 500.0 °C Elastic modulus of 165 GPa -
Elongation 23.0 °C Elongation of 40 % min.
Hardness, Vickers 23.0 °C Hardness, Vickers of 155 [-] -
Tensile strength 23.0 °C Tensile strength of 515 - 690 MPa -
Yield strength Rp0.1 20.0 °C Yield strength Rp0.1 of 250 MPa min.
- 50.0 °C Yield strength Rp0.1 of 232 MPa min.
- 100.0 °C Yield strength Rp0.1 of 210 MPa min.
- 150.0 °C Yield strength Rp0.1 of 195 MPa min.
- 200.0 °C Yield strength Rp0.1 of 185 MPa min.
- 250.0 °C Yield strength Rp0.1 of 175 MPa min.
- 300.0 °C Yield strength Rp0.1 of 167 MPa min.
- 350.0 °C Yield strength Rp0.1 of 162 MPa min.
- 400.0 °C Yield strength Rp0.1 of 159 MPa min.
- 450.0 °C Yield strength Rp0.1 of 156 MPa min.
- 500.0 °C Yield strength Rp0.1 of 155 MPa min.
- 550.0 °C Yield strength Rp0.1 of 152 MPa min.
Yield strength Rp0.2 20.0 °C Yield strength Rp0.2 of 220 MPa min.
- 50.0 °C Yield strength Rp0.2 of 195 MPa min.
- 100.0 °C Yield strength Rp0.2 of 175 MPa min.
- 150.0 °C Yield strength Rp0.2 of 165 MPa min.
- 200.0 °C Yield strength Rp0.2 of 155 MPa min.
- 250.0 °C Yield strength Rp0.2 of 147 MPa min.
- 300.0 °C Yield strength Rp0.2 of 139 MPa min.
- 350.0 °C Yield strength Rp0.2 of 133 MPa min.
- 400.0 °C Yield strength Rp0.2 of 129 MPa min.
- 450.0 °C Yield strength Rp0.2 of 126 MPa min.
- 500.0 °C Yield strength Rp0.2 of 124 MPa min.
- 550.0 °C Yield strength Rp0.2 of 118 MPa min.

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