CASE HARDENING STEEL SAE 8620

SAE 8620 is a low nickel - chromium - molybdenum medium hardenability, case solidifying (carburizing) steel, by and large supplied in the as rolled condition with a most extreme brinell hardness of 280 (Rc30).Characterised by great center quality and sturdiness in little to medium areas with case hardness up to Rc62 when carburized, solidified and tempered.

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, C0.180.23
Manganese, Mn 0.701.00
Silicon, Si-.--0.35
Nickel, Ni0.400.70
Molybdenum, Mo0.080.15
Chromium,Cr0.550.80
Sulfur, S -.--0.05
Phosphorous, P-.-- 0.05

Physical Properties


Properties
Metric
Imperial
Density7.85 g/cm 30.284 lb/in³

Mechanical Properties


Properties
Metric
Imperial
Tensile strength530 MPa76900 psi
Yield strength385 MPa55800 psi
Elastic modulus190-210 GPa27557-30458 ksi
Bulk modulus (typical for steel)140 GPa20300 ksi
Shear modulus (typical for steel)80 GPa11600 ksi
Poisson’s ratio0.27-0.300.27-0.30
Izod Impact115 J84.8 ft.lb
Hardness, Brinell149149
Hardness, Knoop (converted from Brinell hardness)169169
Hardness, Rockwell B (converted from Brinell hardness)8080
Hardness, Vickers (converted from Brinell hardness)155155
Machinability (hot rolled and cold drawn, based on 100 machinability for AISI 1212 steel)6565

Thermal Properties


Properties
Metric
Imperial
Thermal conductivity46.6 W/mK323 BTU in/hr.ft².°F


Features


   Heat Treatment

   Tempering

   Cold Working

   Welding

   Forging

   Annealing

   Hardening

   Hot Working

   Machinability

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