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UNS S66286 (A-286, ASTM Grade 660) Stainless Steel

S66286 stainless steel is a precipitation-hardening stainless steel formulated for primary forming into wrought products. Grade 660 is the ASTM designation for this material. S66286 is the UNS number. And A-286 is the common industry name.

It has a moderately high base cost among wrought precipitation-hardening stainless steels. In addition, it can have the highest ductility and has a moderately high embodied energy.

The properties of S66286 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 S66286 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

190 GPa 28 x 106 psi

Elongation at Break

17 to 40 %

Fatigue Strength

240 to 410 MPa 34 to 59 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

75 GPa 11 x 106 psi

Shear Strength

420 to 630 MPa 62 to 91 x 103 psi

Tensile Strength: Ultimate (UTS)

620 to 1020 MPa 90 to 150 x 103 psi

Tensile Strength: Yield (Proof)

280 to 670 MPa 40 to 97 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

780 °C 1440 °F

Maximum Temperature: Mechanical

920 °C 1690 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1370 °C 2500 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

26 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

6.0 kg CO2/kg material

Embodied Energy

87 MJ/kg 37 x 103 BTU/lb

Embodied Water

170 L/kg 20 gal/lb

Common Calculations

PREN (Pitting Resistance)

19

Resilience: Ultimate (Unit Rupture Work)

150 to 200 MJ/m3

Resilience: Unit (Modulus of Resilience)

190 to 1150 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

22 to 36 points

Strength to Weight: Bending

20 to 28 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

13 to 22 points

Alloy Composition

Among wrought stainless steels, the composition of S66286 stainless steel is notable for including boron (B) and vanadium (V). Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts. It can also facilitate sintering. Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.

Iron (Fe) 49.1 to 59.5
Nickel (Ni) 24 to 27
Chromium (Cr) 13.5 to 16
Titanium (Ti) 1.9 to 2.4
Molybdenum (Mo) 1.0 to 1.5
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 1.0
Vanadium (V) 0.1 to 0.5
Aluminum (Al) 0 to 0.35
Carbon (C) 0 to 0.080
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030
Boron (B) 0.0010 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

ASTM A638: Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

ASTM A276: Standard Specification for Stainless Steel Bars and Shapes

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

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