20MnCr5 / 16MnCr5 Chrome-Manganese Alloy SteelForging Metallurgy & Specs
Automotive & Heavy Transmission Case-Hardening Alloy Steel. 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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20MnCr5 / 16MnCr5 Chrome-Manganese Alloy Steel (UNS H51200 / 1.7147 / 20MnCr5 / 1.7131 (16MnCr5)) offers a minimum tensile strength of 1000 – 1300 MPa (core after case hardening) and yield strength of 700 – 900 MPa (core) with Surface: 59 – 63 HRC; Core: 30 – 38 HRC hardness. Manufactured by Jayesh Forge in Rajkot, Gujarat strictly up to 50 kg per piece, this alloy features Standard steel; requires protective lubrication. Tested per ASTM A388 Level II ultrasonic standards with EN 10204 3.1 MTC inspection.
20MnCr5 / 16MnCr5 Chrome-Manganese Alloy Steel Chemical Analysis (% by Weight)
| Element | Chemical Symbol | Minimum (%) | Maximum (%) | Specification Role |
|---|---|---|---|---|
| Carbon | C | 0.17% | 0.22% | Controls base tensile strength & core hardness |
| Manganese | Mn | 1.10% | 1.40% | Combines with sulfur, increases hardenability and hot workability |
| Chromium | Cr | 1.00% | 1.30% | Forms passive chromium oxide layer for oxidation & corrosion resistance |
| Silicon | Si | — | 0.40% | Deoxidizer during melting; improves high-temperature scaling resistance |
| Phosphorus | P | — | 0.04% | Restricted to prevent temper embrittlement |
| Sulfur | S | — | 0.04% | Strictly controlled for cleaner grain flow and micro-cleanliness |
* 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.
20MnCr5 / 16MnCr5 Chrome-Manganese 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
1150°C – 850°C (2100°F – 1560°F)
Direct hardening or single/double quench from 860°C – 900°C after gas carburizing
Standard steel; requires protective lubrication
Machinability: 60% of AISI 1212 • Moderate; preheat recommended if welding before carburizing
International Equivalent Material Grades
Forged Components Manufactured in 20MnCr5
Automotive & Tractor Gear Blanks
Precision closed-die gear blanks for Tier-1 automotive and tractor transmissions.
20MnCr5 Frequently Asked Technical Questions
20MnCr5 combines Manganese and Chromium to provide high hardenability and superior core toughness at a significantly lower raw material cost than Nickel-bearing steels like 8620, while maintaining outstanding dimensional stability during carburizing.
Related Industrial Metallurgy Specifications
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Manufactured in Rajkot, Gujarat strictly up to 50 kg max piece weight. 4-hour quote turnaround committed.