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SAE-AISI 8630 (G86300) Ni-Cr-Mo Steel

SAE-AISI 8630 steel is an alloy steel formulated for primary forming into wrought products. 8630 is the designation in both the SAE and AISI systems for this material. G86300 is the UNS number.

The properties of SAE-AISI 8630 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 SAE-AISI 8630 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

160 to 200

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 24 %

Fatigue Strength

260 to 350 MPa 37 to 51 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

340 to 410 MPa 50 to 59 x 103 psi

Tensile Strength: Ultimate (UTS)

540 to 680 MPa 78 to 98 x 103 psi

Tensile Strength: Yield (Proof)

360 to 560 MPa 52 to 82 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 2580 °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

11 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)

78 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

340 to 840 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 to 24 points

Strength to Weight: Bending

19 to 22 points

Thermal Diffusivity

10 mm2/s

Thermal Shock Resistance

18 to 23 points

Alloy Composition

Among alloy steels, the composition of SAE-AISI 8630 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) 96.8 to 97.9
Manganese (Mn) 0.7 to 0.9
Nickel (Ni) 0.4 to 0.7
Chromium (Cr) 0.4 to 0.6
Carbon (C) 0.28 to 0.33
Silicon (Si) 0.15 to 0.35
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

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

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