Case Hardening Steel

8620 can also be used (uncarburised) as a high tensile steel, which when suitably hardened and tempered can be utilized for various applications requiring good tensile strength and reasonable toughness.SAE 8620 is suited for applications which require a mix of durability and wear resistance. This evaluation is generally supplied in round bar.

Typical uses are Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Splined Shafts, Ratchets, Sleeves and so on.

Chemical Composition

Element	Min	Max
Carbon, C	0.18	0.23
Manganese, Mn	0.70	1.00
Silicon, Si	-.--	0.35
Nickel, Ni	0.40	0.70
Molybdenum, Mo	0.08	0.15
Chromium,Cr	0.55	0.80
Sulfur, S	-.--	0.05
Phosphorous, P	-.--	0.05

Physical Properties

Properties	Metric	Imperial
Density	7.85 g/cm 3	0.284 lb/in³

Mechanical Properties

Properties	Metric	Imperial
Tensile strength	530 MPa	76900 psi
Yield strength	385 MPa	55800 psi
Elastic modulus	190-210 GPa	27557-30458 ksi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Poisson’s ratio	0.27-0.30	0.27-0.30
Izod Impact	115 J	84.8 ft.lb
Hardness, Brinell	149	149
Hardness, Knoop (converted from Brinell hardness)	169	169
Hardness, Rockwell B (converted from Brinell hardness)	80	80
Hardness, Vickers (converted from Brinell hardness)	155	155
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)	65	65

Thermal Properties

Properties	Metric	Imperial
Thermal conductivity	46.6 W/mK	323 BTU in/hr.ft².°F

Features

Heat Treatment

Tempering

Cold Working

Welding

Forging

Annealing

Hardening

Hot Working

Machinability