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UNS S35500 (Alloy 355, Alloy 634) Stainless Steel

S35500 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. S35500 is the UNS number for this material. Alloy 355 is the common industry name.

It has a moderately high ductility and can have a moderately high tensile strength among wrought precipitation-hardening stainless steels.

The properties of S35500 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 S35500 stainless steel to: wrought precipitation-hardening 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

690 to 730 MPa 100 to 110 x 103 psi

Poisson's Ratio

0.28

Rockwell C Hardness

33 to 42

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

810 to 910 MPa 120 to 130 x 103 psi

Tensile Strength: Ultimate (UTS)

1330 to 1490 MPa 190 to 220 x 103 psi

Tensile Strength: Yield (Proof)

1200 to 1280 MPa 170 to 190 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

440 °C 830 °F

Maximum Temperature: Mechanical

870 °C 1610 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

16 W/m-K 9.5 BTU/h-ft-°F

Thermal Expansion

11 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

16 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.5 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

130 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

27

Resilience: Ultimate (Unit Rupture Work)

180 to 190 MJ/m3

Resilience: Unit (Modulus of Resilience)

3610 to 4100 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

47 to 53 points

Strength to Weight: Bending

34 to 37 points

Thermal Diffusivity

4.4 mm2/s

Thermal Shock Resistance

44 to 49 points

Alloy Composition

Among wrought stainless steels, the composition of S35500 stainless steel is notable for including niobium (Nb). Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 73.2 to 77.7
Chromium (Cr) 15 to 16
Nickel (Ni) 4.0 to 5.0
Molybdenum (Mo) 2.5 to 3.2
Manganese (Mn) 0.5 to 1.3
Niobium (Nb) 0.1 to 0.5
Silicon (Si) 0 to 0.5
Carbon (C) 0.1 to 0.15
Nitrogen (N) 0.070 to 0.13
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

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

Followup Questions

Similar Alloys

Further Reading

ASTM A693: Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

ASTM A564: Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes

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