AISI 8620 Case-Hardening Triple Alloy SteelForging Metallurgy & Specs
Ni-Cr-Mo Carburizing Steel for Wear-Resistant Gears and Transmission Pinions. Hot-forged and precision-machined in Rajkot, Gujarat strictly up to 50 kg max piece weight with 100% Optical Emission Spectrometry (OES) PMI testing and EN 10204 3.1 MTC compliance.
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AISI 8620 Case-Hardening Triple Alloy Steel (UNS G86200 / 1.6523 / 20NiCrMo2-2 / SNCM220) offers a minimum tensile strength of 750 – 950 MPa (core after heat treat) and yield strength of 550 – 700 MPa (core) with Surface: 58 – 62 HRC (after carburize & oil quench); Core: 25 – 35 HRC hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Low; requires lubricating oil film or phosphate coating. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
AISI 8620 Case-Hardening Triple Alloy Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | 0.18% | 0.23% | Controls base tensile strength & core hardness |
| Nickel | Ni | 0.40% | 0.70% | Improves notch toughness, cryogenic ductility & hardenability |
| Chromium | Cr | 0.40% | 0.60% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Molybdenum | Mo | 0.15% | 0.25% | Prevents chloride pitting and enhances high-temperature creep strength |
| Manganese | Mn | 0.70% | 0.90% | Combines with sulfur, increases hardenability and hot workability |
| Silicon | Si | 0.15% | 0.35% | Deoxidizer during melting; improves high-temperature scaling resistance |
* Ladle chemical analysis verified using optical emission spectrometer (OES) calibrated to NIST certified reference materials. Full chemical results recorded on EN 10204 3.1 MTC.
AISI 8620 Case-Hardening Triple Alloy Steel Mechanical Properties
Ultimate breaking stress threshold
Elastic deformation limit
Plastic ductility before rupture
Surface indentation resistance
Cross-sectional necking ductile ratio
Dynamic fracture energy absorption
Thermal Cycle & Machining Parameters
1200°C – 900°C (2190°F – 1650°F)
Carburized at 900°C – 930°C to desired case depth (0.8mm - 2.5mm), oil quenched, tempered at 180°C
Low; requires lubricating oil film or phosphate coating
Machinability: 65% of AISI 1212 • Good in as-forged condition; must be welded before carburizing
International Equivalent Material Grades
Forged Components Manufactured in AISI 8620
AISI 8620 Frequently Asked Technical Questions
Depending on furnace cycle time and carbon potential, AISI 8620 forgings typically achieve case depths ranging from 0.8 mm up to 3.0 mm with surface hardness reaching 60–62 HRC.
Related Industrial Metallurgy Specifications
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