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UNS S17600 (Alloy 635) Stainless Steel

S17600 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. S17600 is the UNS number for this material. Alloy 635 is the common industry name.

The properties of S17600 stainless steel include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare S17600 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

Brinell Hardness

270 to 410

Elastic (Young's, Tensile) Modulus

200 GPa 28 x 106 psi

Elongation at Break

8.6 to 11 %

Fatigue Strength

300 to 680 MPa 43 to 99 x 103 psi

Poisson's Ratio

0.28

Reduction in Area

28 to 50 %

Rockwell C Hardness

28 to 44

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

560 to 880 MPa 81 to 130 x 103 psi

Tensile Strength: Ultimate (UTS)

940 to 1490 MPa 140 to 220 x 103 psi

Tensile Strength: Yield (Proof)

580 to 1310 MPa 84 to 190 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

550 °C 1030 °F

Maximum Temperature: Mechanical

890 °C 1630 °F

Melting Completion (Liquidus)

1430 °C 2610 °F

Melting Onset (Solidus)

1390 °C 2530 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.9 BTU/h-ft-°F

Thermal Expansion

11 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

7.8 g/cm3 480 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

42 MJ/kg 18 x 103 BTU/lb

Embodied Water

130 L/kg 16 gal/lb

Common Calculations

PREN (Pitting Resistance)

17

Resilience: Ultimate (Unit Rupture Work)

70 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

850 to 4390 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

34 to 54 points

Strength to Weight: Bending

28 to 37 points

Thermal Diffusivity

4.1 mm2/s

Thermal Shock Resistance

31 to 50 points

Alloy Composition

Among wrought stainless steels, the composition of S17600 stainless steel is notable for including aluminum (Al) and titanium (Ti). Aluminum is used to improve oxidation resistance. It can also enhance the effects of heat treatment. Titanium is used to broadly improve mechanical properties.

Iron (Fe) 71.3 to 77.6
Chromium (Cr) 16 to 17.5
Nickel (Ni) 6.0 to 7.5
Titanium (Ti) 0.4 to 1.2
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Aluminum (Al) 0 to 0.4
Carbon (C) 0 to 0.080
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

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