20MnCr5 Steel Grade Supplier in India
20MnCr5 Round Bars, Billets, Flats & Ingots
What is 20MnCr5 Steel?
20MnCr5 is a low-carbon, manganese-chromium alloy steel extensively used for case-hardening (carburizing) applications. Designed to develop a high surface hardness with a tough, impact-resistant core, it is a primary material choice for high-stress gears, shafts, and automotive transmission components.
It is widely specified in European (DIN/EN) engineering standards and is highly preferred by automotive OEM manufacturers and forging companies because of its excellent machinability, forgeability, and reliable response to heat treatment.
20MnCr5 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.17 – 0.22 |
| Silicon (Si) | 0.15 – 0.40 |
| Manganese (Mn) | 1.10 – 1.40 |
| Chromium (Cr) | 1.00 – 1.30 |
| Sulphur (S) | ≤ 0.035 |
| Phosphorus (P) | ≤ 0.035 |
Typical Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (Core) | 1000–1300 MPa |
| Yield Strength (Core) | ≥ 780 MPa |
| Hardness (Annealed) | Max 212 HB |
| Elongation | ≥ 9% |
| Density | 7.85 g/cm³ |
Note: Core mechanical properties vary heavily based on section size and the specific carburizing/quenching cycle applied.
Key Properties of 20MnCr5 Steel
Excellent Carburizing Response
Develops a very hard and uniform surface layer for superior wear resistance.
High Core Toughness
Provides strong impact resistance in the core after case hardening, preventing brittle failure.
Good Machinability
Easily machined in the annealed condition before heat treatment.
High Fatigue Strength
Ideal for gears and transmission components subjected to cyclic loads.
Excellent Forgeability
A highly preferred grade for hot forging applications in the automotive sector.
20MnCr5 Heat Treatment
20MnCr5 is specifically formulated for case hardening.
Normalizing
Performed before machining or carburizing to refine grain structure and ensure dimensional stability.
Carburizing
Carbon is diffused into the surface at high temperatures, creating a high-carbon outer layer.
Quenching
Typically oil quenched to harden the carburized case while maintaining core properties.
Tempering
Relieves quenching stresses and optimizes the balance of surface hardness and core toughness.
20MnCr5 for Forging Applications
20MnCr5 is one of the most widely used carburizing steels in forging units because it offers:
- Excellent hot forgeability
- Reliable response to heat treatment
- High surface wear resistance
- Tough, impact-resistant core
It is highly preferred for forging gears, pinions, and shafts in the automotive industry.
Common Applications
- • Transmission gears and shafts
- • Camshafts
- • Pinion and crown wheels
- • Universal joints
- • Splined shafts
- • Wear-resistant bushings
- • Heavy-duty forged automotive components
- • General mechanical engineering parts
20MnCr5 Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| DIN / EN | 1.7147 |
| AISI/SAE | 5120 (Approximate) |
| JIS | SMnC420 |
| IS (Indian Standard) | 20MnCr5 |
* Note: While 20MnCr5 is a very common European specification (EN 10084), buyers sometimes substitute it with 16MnCr5 (which has slightly lower carbon content) or SAE 8620 depending on precise mechanical requirements.
20MnCr5 vs 16MnCr5
Both are carburizing steels. The primary difference is the carbon content. 20MnCr5 has slightly higher carbon (0.17-0.22%) compared to 16MnCr5 (0.14-0.19%). This allows 20MnCr5 to achieve slightly higher core strength after heat treatment, making it suitable for heavier duty gears.
20MnCr5 vs SAE 8620
| Property | 20MnCr5 | SAE 8620 |
|---|---|---|
| Nickel Content | No | Yes |
| Molybdenum | No | Yes |
| Toughness | Excellent | Superior |
| Origin | European (DIN/EN) | American (AISI/SAE) |
SAE 8620 is often preferred in American specs for its nickel and molybdenum, providing slightly better toughness.
Available Forms at Excellent Steels & Alloys
20MnCr5 Billets
- Closed die forgings
- Open die forgings
- Automotive component manufacturing
20MnCr5 Ingots
- Forging units
- Rolling mills
- Re-melting applications
20MnCr5 Round Bars
- Gear blanks
- Transmission shafts
- Precision-machined parts
20MnCr5 Flats
- Tooling and fixtures
- Machine building
- Fabrication components
Frequently Asked Questions
What is 20MnCr5 steel used for?
20MnCr5 is mainly used for case-hardened components such as gears, pinions, camshafts and transmission parts in the automotive industry.
Is 20MnCr5 a case-hardening steel?
Yes. It is specifically formulated for carburizing to achieve a hard wear-resistant surface with a tough core.
Can 20MnCr5 be forged?
Yes, it has excellent hot forgeability and is widely used by automotive forging units.
What forms of 20MnCr5 are available?
Excellent Steels & Alloys supplies 20MnCr5 in Billets, Ingots, Round Bars, and Flats.
Excellent Steels & Alloys is a trusted supplier of 20MnCr5 alloy steel and 1.7147 steel in India. We supply 20MnCr5 billets, 20MnCr5 ingots, 20MnCr5 round bars and 20MnCr5 flats to forging units, machine shops and engineering manufacturers across the country.
Why Buy 20MnCr5 from Us?
- Consistent material chemistry
- Competitive pricing
- Fast dispatch across India
- Billets, ingots, round bars and flats
- Support for automotive forging units and OEMs
- Reliable sourcing for custom requirements
Industries Served
- • Automotive Manufacturing
- • Gear Manufacturing
- • Forging Industry
- • Heavy Engineering
- • Agricultural Equipment
- • Power Transmission
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Contact us today for pricing, stock availability, and customized requirements for 20MnCr5 Steel.