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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.

Iron (Fe) 74 to 81.9
Chromium (Cr) 12 to 15
Nickel (Ni) 4.0 to 7.0
Molybdenum (Mo) 1.5 to 2.0
Manganese (Mn) 0.5 to 1.0
Silicon (Si) 0 to 0.5
Copper (Cu) 0 to 0.3
Nitrogen (N) 0.060 to 0.12
Carbon (C) 0 to 0.050
Phosphorus (P) 0 to 0.020
Sulfur (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