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SAE 8620 Alloy Steel is a low alloy nickel, chromium, molybdenum case hardening steel, generally supplied in the as-rolled condition with a maximum hardness HB 255max. SAE 8620 alloy steel offers high external strength and good internal strength, making it highly wear-resistant. SAE 8620 steel has a higher core strength than grades 8615 and 8617.
SAE 8620 alloy steel is flexible during hardening treatments, thus enabling improvement of case/core properties. Prehardened and tempered (uncarbonized) 8620 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content. SAE 8620 alloy steel is suited for applications that require a combination of toughness and wear resistance. This grade is commonly supplied in a round bar.
The SAE 8620 can be used for a number of medium-strength applications such as camshafts, fasteners, gears, and chains/chain pins.
|ASTM A29||DIN 1654||EN 10084||BS 970||JIS G4103|
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of SAE8620 steel:
|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|
|Izod Impact||115 J||84.8 ft.lb|
|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|
This alloy may be hardened by heating to 1500 F followed by a water quench. Carburize at 1650 to 1700 F in an appropriate carburizing medium and oil quench to harden. Improved carburized case and core properties can be obtained by furnace cooling from carburizing at 1650 – 1700 F and then reheating to 1575 F.
The AISI steel 8620 will be austenitized at around 840°C – 870°C, and oil or water quenched depending upon section size and intricacy. Cool in Air or Oil required.
Tempering of heat-treated and water quenched parts of SAE 8620 steel (not carburized) is done at 400 F to 1300 F to improve case toughness with minimal effect on its hardness. This will also reduce the possibility of grinding cracks.
The physical properties of SAE 8620 alloy steel are highlighted in the following table.
|Density||7.85 g/cm3||0.284 lb/in³|
|Thermal conductivity||46.6 W/mK||323 BTU in/hr.ft².°F|