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AFNOR 20NCD2 Chrome Moly Alloy Steel Bars
75.0 INR/Kilograms
Product Details:
- Grade 20NCD2
- Specific Use High Strength Applications, Gear Manufacturing, Shafts, Fasteners
- Type Alloy Steel Bars
- Standard AFNOR 20NCD2
- Length Custom / As Required
- Material Chrome Moly Alloy Steel
- Diameter 16mm to 300mm or as Required
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AFNOR 20NCD2 Chrome Moly Alloy Steel Bars Price And Quantity
- 1 Kilograms
- 75.0 INR/Kilograms
AFNOR 20NCD2 Chrome Moly Alloy Steel Bars Product Specifications
- Chrome Moly Alloy Steel
- 16mm to 300mm or as Required
- 20NCD2
- High Strength Applications, Gear Manufacturing, Shafts, Fasteners
- Alloy Steel Bars
- AFNOR 20NCD2
- Custom / As Required
- Hot Rolled / Forged
- Annealed / Normalized / Hardened & Tempered
- Bright / Black / Peeled
- Engineering, Automotive, Structural Components, Machinery Parts
- H10, H11 or as per Request
- Quenching and Tempering Possible
- Annealed: 217 HB max (approx.)
- Polished / Rough
- Approximately 835 MPa (varies by condition)
- Standard Sea Worthy Packing or as Requested
- Bars, Rods, Billets
- Approximately 980 MPa (varies by condition)
- 14% Min (in 50mm)
- Available on Request
- Round
Product Description
AFNOR 20NCD2 is a classic French standard (Association Franaise de Normalisation) low-alloy structural steel. While it contains chromium and molybdenum, it is technically a Nickel-Chromium-Molybdenum triple-alloy steel formulated specifically for case-hardening (carburizing).
If you are sourcing or machining 20NCD2 bar stock, it is the exact historical French equivalent to the globally ubiquitous AISI 8620 or European 20NiCrMo2-2. It is chosen for high-wear, high-fatigue components that require a glass-hard outer shell but an incredibly tough, shatter-proof core.
1. Decoding the Alphanumeric Name
The French AFNOR naming convention tells you exactly what is inside the bar:
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20: Represents $sim 0.20%$ average Carbon content ($0.17% - 0.23%$). This low initial carbon is deliberate, ensuring the core remains ductile and doesn't get brittle during quenching.
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N (Nickel): Promotes high core toughness and shock resistance.
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C (Chromium): Enhances depth of hardenability and wear resistance.
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D (Molybdenum): Increases core strength and prevents temper brittleness.
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2: Indicates the major alloying elements are present at low, balanced levels (typically under $1%$ each).
2. Chemical Composition Breakdown
| Element | Composition (%) | Primary Metallurgical Role |
| Carbon (C) | $0.17% - 0.23%$ | Keeps the core weldable and ductile; accepts carbon during case-hardening. |
| Nickel (Ni) | $0.40% - 0.70%$ | Delivers extreme resistance to impact and heavy shock loading. |
| Chromium (Cr) | $0.35% - 0.70%$ | Allows the surface layer to achieve extreme hardness when heat-treated. |
| Molybdenum (Mo) | $0.15% - 0.25%$ | Refines grains and guarantees high fatigue limits under cyclic stress. |
| Manganese (Mn) | $0.65% - 0.95%$ | Enhances the steel's response to heat treatment. |
| Silicon (Si) | $le 0.40%$ | Acts as a deoxidizer during manufacturing. |
3. Core Mechanics & Heat Treatment Strategy
Because 20NCD2 bars have relatively low baseline carbon, you cannot get them fully hard straight out of the box by standard quenching. It is designed to undergo a multi-step thermal cycle:
The Carburizing Process
Components are machined in their soft state, then exposed to a carbon-rich atmosphere at $880^circtext{C} - 950^circtext{C}$. Carbon diffuses into the outer layer (case), raising the surface carbon content to $sim 0.80%$.
Quenching and Tempering (+QT)
Following carburization, the bars are oil or water quenched (typically from $810^circtext{C} - 830^circtext{C}$) and low-temperature tempered at $150^circtext{C} - 200^circtext{C}$.
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The Result: A surface hardness of $58 - 63 text{ HRC}$ (excellent wear and abrasion resistance) wrapped around a core with a tensile strength of $700 - 1100 text{ MPa}$ (retains elasticity to prevent fracturing under load).
4. Common Technical Applications
AFNOR 20NCD2 bars are heavily utilized for components that see extreme contact friction paired with sudden torque spikes:
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Automotive & Drivetrain: Heavy-duty gearboxes, driving bevel gears, crown wheels, splined shafts, and universal joints.
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Heavy Equipment: Link pins, high-speed bearings, steering knuckles, and heavy-duty transmission components for agricultural and mining vehicles.
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Fasteners: High-stress safety bolts and anchor pins subject to shear forces.
5. Direct Global Equivalents
If you need to source this material locally or cross-reference mill certificates, 20NCD2 matches seamlessly with:
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United States: AISI 8620 / SAE 8620 / UNS G86200
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Europe / Germany: 20NiCrMo2-2 / W.Nr. 1.6523
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United Kingdom: BS 805M20
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Japan: JIS SNCM220 / SNCM220H
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Russia: GOST 20KhGNM (20)
Engineered for High Performance
AFNOR 20NCD2 Chrome Moly Alloy Steel Bars are selected for their superior strength and reliability. Meeting rigorous AFNOR standards, these alloy bars deliver optimum performance in automotive, engineering, and structural applications where durability and mechanical resilience are crucial.
Versatility in Form and Finish
Available as bars, rods, or billets, these steel products can be supplied in either polished or rough surface conditions. Multiple finishes-bright, black, or peeled-and processing states, such as annealed, normalized, or hardened and tempered, grant tailored solutions to fit unique project specifications.
Custom Packaging and Handling
To ensure safe delivery, bars are packaged in standard sea-worthy conditions, with customization available upon request. This makes them an ideal export product for distributors, fabricators, and end-users worldwide, particularly those seeking reliable supply within India or for international projects.
FAQ's of AFNOR 20NCD2 Chrome Moly Alloy Steel Bars:
Q: How can AFNOR 20NCD2 Chrome Moly Alloy Steel Bars be processed for specific applications?
A: These alloy steel bars can be supplied in various processed conditions, including annealed, normalized, or hardened and tempered. Heat treatment such as quenching and tempering can enhance their mechanical properties, making them suitable for high-strength components like gears, shafts, or fasteners.Q: What are the main benefits of using AFNOR 20NCD2 Chrome Moly Alloy Steel Bars in engineering and automotive sectors?
A: The bars offer high yield and tensile strengths (835 MPa and 980 MPa, respectively), good ductility with a minimum elongation of 14% in 50mm, and reliable hardness (up to 217 HB). These properties make them highly dependable for demanding applications where strength, durability, and resistance to wear are essential.Q: When is it advisable to choose a polished finish over a rough finish for these steel bars?
A: A polished finish is typically selected for components that require an improved surface appearance or tighter dimensional tolerances, such as visible machinery parts or precision gears. Rough finishes may be sufficient for applications where surface aesthetics are less critical.Q: Where are AFNOR 20NCD2 alloy steel bars commonly used?
A: They are prominently used in engineering, automotive, and structural components, particularly for gear manufacturing, shafts, and fasteners. Their reliability and adaptability also make them suitable for machinery parts and other high-strength applications in construction or industrial machinery.Q: What is the typical supply range for diameter and length for these bars?
A: AFNOR 20NCD2 bars are available in diameters ranging from 16mm to 300mm, with length and tolerance customizable as per client requirements. This flexibility allows them to fit a broad spectrum of design and manufacturing needs.Q: How is the export packaging of these steel bars managed?
A: Bars are typically delivered in standard sea-worthy packaging to ensure safety during transport. Special packaging configurations can also be arranged based on specific customer requests or destination requirements.Tell us about your requirement
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