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.
| Fe | 96.9 to 98 | |
| Mn | 0.7 to 0.9 | |
| Ni | 0.4 to 0.7 | |
| Cr | 0.4 to 0.6 | |
| Si | 0.15 to 0.35 | |
| C | 0.18 to 0.23 | |
| Mo | 0.15 to 0.25 | |
| S | 0 to 0.040 | |
| 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