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.
| Fe | 73.2 to 77.7 | |
| Cr | 15 to 16 | |
| Ni | 4.0 to 5.0 | |
| Mo | 2.5 to 3.2 | |
| Mn | 0.5 to 1.3 | |
| Nb | 0.1 to 0.5 | |
| Si | 0 to 0.5 | |
| C | 0.1 to 0.15 | |
| N | 0.070 to 0.13 | |
| P | 0 to 0.040 | |
| 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