UNS S41425 (13-5-2) Stainless Steel
S41425 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. S41425 is the UNS number for this material. 13-5-2 is the common industry name.
It has a fairly high base cost among wrought martensitic stainless steels. In addition, it has a moderately low electrical conductivity and a moderately low thermal conductivity.
The properties of S41425 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 S41425 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
Brinell Hardness
280
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
17 %
Fatigue Strength
450 MPa 66 x 103 psi
Poisson's Ratio
0.28
Reduction in Area
51 %
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
570 MPa 82 to 83 x 103 psi
Tensile Strength: Ultimate (UTS)
920 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
750 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Maximum Temperature: Corrosion
390 °C 740 °F
Maximum Temperature: Mechanical
810 °C 1490 °F
Melting Completion (Liquidus)
1450 °C 2650 °F
Melting Onset (Solidus)
1410 °C 2570 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
16 W/m-K 9.4 BTU/h-ft-°F
Thermal Expansion
10 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
13 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.9 kg CO2/kg material
Embodied Energy
40 MJ/kg 17 x 103 BTU/lb
Embodied Water
120 L/kg 14 gal/lb
Common Calculations
PREN (Pitting Resistance)
21
Resilience: Ultimate (Unit Rupture Work)
150 MJ/m3
Resilience: Unit (Modulus of Resilience)
1420 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
33 points
Strength to Weight: Bending
27 points
Thermal Diffusivity
4.4 mm2/s
Thermal Shock Resistance
33 points
Alloy Composition
Among wrought stainless steels, the composition of S41425 stainless steel is notable for including copper (Cu). Copper is used to improve resistance to acids, and to improve formability.
| Fe | 74 to 81.9 | |
| Cr | 12 to 15 | |
| Ni | 4.0 to 7.0 | |
| Mo | 1.5 to 2.0 | |
| Mn | 0.5 to 1.0 | |
| Si | 0 to 0.5 | |
| Cu | 0 to 0.3 | |
| N | 0.060 to 0.12 | |
| C | 0 to 0.050 | |
| P | 0 to 0.020 | |
| S | 0 to 0.0050 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A565: Standard Specification for Martensitic Stainless Steel Bars for High-Temperature Service
ASTM A473: Standard Specification for Stainless Steel Forgings
ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011
Corrosion of Stainless Steels, A. John Sedriks, 1996
ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010