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SAE-AISI 8620 (SNCM220, G86200) Ni-Cr-Mo Steel

SAE-AISI 8620 steel is an alloy steel formulated for primary forming into wrought products. 8620 is the designation in both the SAE and AISI systems for this material. G86200 is the UNS number. It can have the highest ductility among the SAE-AISI wrought steels in the database.

The properties of SAE-AISI 8620 steel include three 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 SAE-AISI 8620 steel to: SAE-AISI wrought 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

150 to 210

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

13 to 31 %

Fatigue Strength

270 to 360 MPa 39 to 53 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

340 to 420 MPa 50 to 60 x 103 psi

Tensile Strength: Ultimate (UTS)

520 to 690 MPa 76 to 100 x 103 psi

Tensile Strength: Yield (Proof)

360 to 570 MPa 52 to 83 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 780 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

39 W/m-K 22 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.6 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.7 x 103 BTU/lb

Embodied Water

50 L/kg 5.9 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

86 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

340 to 880 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

18 to 24 points

Strength to Weight: Bending

18 to 22 points

Thermal Diffusivity

10 mm2/s

Thermal Shock Resistance

15 to 20 points

Alloy Composition

Among alloy steels, the composition of SAE-AISI 8620 steel is notable for including nickel (Ni). Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.

Iron (Fe) 96.9 to 98
Manganese (Mn) 0.7 to 0.9
Nickel (Ni) 0.4 to 0.7
Chromium (Cr) 0.4 to 0.6
Silicon (Si) 0.15 to 0.35
Carbon (C) 0.18 to 0.23
Molybdenum (Mo) 0.15 to 0.25
Sulfur (S) 0 to 0.040
Phosphorus (P) 0 to 0.035

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

Followup Questions

Similar Alloys

Further Reading

ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel

ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015