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UNS S41003 (3CR12) Stainless Steel

S41003 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. S41003 is the UNS number for this material. 3CR12 is the common industry name.

It has a moderately low embodied energy among wrought martensitic stainless steels. In addition, it has a fairly low tensile strength and a moderately high ductility.

The graph bars on the material properties cards below compare S41003 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

200

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

21 %

Fatigue Strength

200 MPa 29 x 103 psi

Poisson's Ratio

0.28

Rockwell C Hardness

17

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

320 MPa 47 x 103 psi

Tensile Strength: Ultimate (UTS)

520 MPa 75 x 103 psi

Tensile Strength: Yield (Proof)

310 MPa 45 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Corrosion

390 °C 730 °F

Maximum Temperature: Mechanical

720 °C 1320 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2560 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

27 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.0 % relative

Density

7.8 g/cm3 480 lb/ft3

Embodied Carbon

1.9 kg CO2/kg material

Embodied Energy

27 MJ/kg 12 x 103 BTU/lb

Embodied Water

97 L/kg 12 gal/lb

Common Calculations

PREN (Pitting Resistance)

12

Resilience: Ultimate (Unit Rupture Work)

92 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

7.2 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among wrought stainless steels, the composition of S41003 stainless steel is notable for containing comparatively high amounts of chromium (Cr) and manganese (Mn). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.

Iron (Fe) 83.4 to 89.5
Chromium (Cr) 10.5 to 12.5
Manganese (Mn) 0 to 1.5
Nickel (Ni) 0 to 1.5
Silicon (Si) 0 to 1.0
Phosphorus (P) 0 to 0.040
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.030
Nitrogen (N) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003

ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015