EN 1.4912 (X7CrNiNb18-10) Stainless Steel
EN 1.4912 stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4912 is the EN numeric designation for this material. X7CrNiNb18-10 is the EN chemical designation.
The graph bars on the material properties cards below compare EN 1.4912 stainless steel to: wrought austenitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
180
Elastic (Young's, Tensile) Modulus
200 GPa 28 x 106 psi
Elongation at Break
40 %
Fatigue Strength
200 MPa 29 x 103 psi
Impact Strength: V-Notched Charpy
90 J 67 ft-lb
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
420 MPa 60 x 103 psi
Tensile Strength: Ultimate (UTS)
610 MPa 88 x 103 psi
Tensile Strength: Yield (Proof)
230 MPa 33 x 103 psi
Thermal Properties
Latent Heat of Fusion
290 J/g
Maximum Temperature: Corrosion
520 °C 970 °F
Maximum Temperature: Mechanical
940 °C 1720 °F
Melting Completion (Liquidus)
1430 °C 2610 °F
Melting Onset (Solidus)
1390 °C 2530 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.0 BTU/h-ft-°F
Thermal Expansion
16 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
20 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
3.8 kg CO2/kg material
Embodied Energy
55 MJ/kg 24 x 103 BTU/lb
Embodied Water
140 L/kg 17 gal/lb
Common Calculations
PREN (Pitting Resistance)
18
Resilience: Ultimate (Unit Rupture Work)
190 MJ/m3
Resilience: Unit (Modulus of Resilience)
130 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
22 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
4.2 mm2/s
Thermal Shock Resistance
14 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4912 stainless steel is notable for including niobium (Nb). Niobium is primarily used to improve yield strength, particularly at elevated temperatures.
| Fe | 64.6 to 73.6 | |
| Cr | 17 to 19 | |
| Ni | 9.0 to 12 | |
| Mn | 0 to 2.0 | |
| Nb | 0.4 to 1.2 | |
| Si | 0 to 1.0 | |
| C | 0.040 to 0.1 | |
| P | 0 to 0.045 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10222-5: Steel forgings for pressure purposes - Part 5: Martensitic, austenitic and austenitic-ferritic stainless steels
EN 10088-1: Stainless steels - Part 1: List of stainless steels
Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002
Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010