EN 1.4122 (X39CrMo17-1) Stainless Steel
EN 1.4122 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. 1.4122 is the EN numeric designation for this material. X39CrMo17-1 is the EN chemical designation.
It has a fairly low electrical conductivity among wrought martensitic stainless steels. In addition, it has a fairly low thermal conductivity and a moderately low ductility.
The properties of EN 1.4122 stainless steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.4122 stainless steel to: wrought martensitic 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
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
14 %
Fatigue Strength
260 to 360 MPa 38 to 52 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
480 to 520 MPa 70 to 75 x 103 psi
Tensile Strength: Ultimate (UTS)
790 to 850 MPa 110 to 120 x 103 psi
Tensile Strength: Yield (Proof)
450 to 630 MPa 66 to 91 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
400 °C 750 °F
Maximum Temperature: Mechanical
870 °C 1590 °F
Melting Completion (Liquidus)
1440 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.7 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
9.5 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
2.4 kg CO2/kg material
Embodied Energy
33 MJ/kg 14 x 103 BTU/lb
Embodied Water
120 L/kg 14 gal/lb
Common Calculations
PREN (Pitting Resistance)
20
Resilience: Ultimate (Unit Rupture Work)
93 to 110 MJ/m3
Resilience: Unit (Modulus of Resilience)
520 to 1000 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
28 to 31 points
Strength to Weight: Bending
25 to 26 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
28 to 30 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4122 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and molybdenum (Mo). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties.
| Fe | 77.2 to 83.4 | |
| Cr | 15.5 to 17.5 | |
| Mo | 0.8 to 1.3 | |
| Mn | 0 to 1.5 | |
| Si | 0 to 1.0 | |
| Ni | 0 to 1.0 | |
| C | 0.33 to 0.45 | |
| P | 0 to 0.040 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
Welding Metallurgy, 2nd ed., Sindo Kou, 2003
EN 10088-3: Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes
Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005
EN 10088-1: Stainless steels - Part 1: List of stainless steels
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010