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AFNOR 25CD4 Alloy Steel Chrome Moly Bars
95.0 INR/Kilograms
Product Details:
- Length 1000 mm to 6000 mm (custom sizes available)
- Grade 25CD4
- Type Bars (Round, Hex, Square, Flat)
- Processing Forged / Rolled / Peeled / Turned / Heat Treated
- Technique Hot Rolled / Cold Drawn
- Application Automobile industries, Engineering, Structural, Machinery, Aerospace, Oil & Gas, Power generation
- Tolerance H8, H9, h9 or as per requirement
- Click to view more
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AFNOR 25CD4 Alloy Steel Chrome Moly Bars Price And Quantity
- 95.0 INR/Kilograms
- 1 Kilograms
AFNOR 25CD4 Alloy Steel Chrome Moly Bars Product Specifications
- Hot Rolled / Cold Drawn
- Forged / Rolled / Peeled / Turned / Heat Treated
- Bars (Round, Hex, Square, Flat)
- 25CD4
- 1000 mm to 6000 mm (custom sizes available)
- Components that require high strength, toughness, and resistance to wear, such as motor shafts, fasteners, and gears
- 5 mm to 400 mm
- AFNOR 25CD4 Alloy Steel (Chrome Moly)
- AFNOR 25CD4
- Bright, Peeled, Polished, Black, Rough turned
- H8, H9, h9 or as per requirement
- Automobile industries, Engineering, Structural, Machinery, Aerospace, Oil & Gas, Power generation
- Min 800 MPa (depends on heat treatment)
- Round, Square, Hexagonal, Flat Bar
- Indian / European mills available
- 14% minimum (varies by process)
- Min 550 MPa (depends on heat treatment)
- As rolled, Annealed, Quenched & Tempered
- 35 J min (Charpy V-Notch at room temp, typical)
- Bundled, Wooden boxes, Plastic wrapping available on request
- Ultrasonic, Eddy current, Mechanical, Chemical, NDT
- Bright, Polished, Annealed, Black
- Normalizing, Tempering, Quenching, Annealing on requirement
- As per requirement or specification
Product Description
AFNOR 25CD4 (commonly referred to in modern standards as 25CrMo4 or material number 1.7218) is a premium, low-alloy structural chrome-moly steel under the French national standardization system.
Characterized by its lower carbon threshold (around 0.25%), 25CD4 is heavily favored in high-performance engineering fields like motorsport, aerospace, and light aircraft construction. It hits a sweet spot that higher-carbon alternatives like 4140 cannot touch: excellent structural weldability paired with massive dynamic fatigue resistance.
Global Equivalents
Because 25CD4 is an industry standard across European precision manufacturing, it aligns with these prominent designations:
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USA (AISI/SAE): AISI 4130 / UNS G41300
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Germany (DIN / WNr): 25CrMo4 / 1.7218
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UK (BS): 708A25
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Japan (JIS): SCM420 / SCM430 variants
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Euronorm: 25CrMo4
Chemical Composition (Typical %)
The modest carbon level makes the alloy considerably less prone to localized cracking during welding, while the chromium and molybdenum ensure deep, uniform heat-treatment properties.
| Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|
| 0.22% 0.29% | 0.90% 1.20% | 0.15% 0.30% | 0.60% 0.90% | 0.10% 0.40% | 0.025% | 0.035% |
Mechanical Properties (Quenched & Tempered, +QT)
25CD4 round bars are highly versatile and can be tailored via heat treatment. Below are typical minimum values when supplied or treated in the standard hardened and tempered condition (varying slightly by section diameter $d$):
-
Tensile Strength ($R_m$): 700 1100 MPa (depending on thickness)
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Yield Strength ($R_{p0.2}$): 450 700 MPa
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Elongation ($A_5$): 12% 15%
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Impact Toughness (ISO-V): 45 50 J
-
Typical Hardness Range: 200 240 HBW (annealed) | up to 300+ HBW (hardened)
Key Technical Advantages
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Superior Weldability: Unlike 42CD4 (AISI 4140), 25CD4 does not necessarily require intensive pre-heating cycles for thinner sections, making it the premier material for complex, multi-joint tubular spaceframes and structures.
-
Excellent Strength-to-Weight Ratio: Its high fatigue resistance allows engineers to design thin-walled tubular parts that handle high cyclic loads without adding unnecessary dead weight.
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Nitridation Ready: If localized wear resistance is needed on a component (like a steering knuckle or small shaft), 25CD4 can be nitrided to give it an intensely hard surface layer.
Typical Applications
Due to its outstanding mechanical reliability under vibration and dynamic impacts, 25CD4 alloy bars find a home in demanding structural contexts:
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Motorsport & Aerospace: Welded safety roll cages, spaceframe chassis, go-kart structures, and aircraft engine mounts.
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Automotive Control Parts: Steering knuckles, connection racks, stabilizer bars, and anti-roll assemblies.
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Energy & Mechanical Engineering: High-durability threaded fasteners, turbine rotor pins, and high-pressure structural bolts.
High Performance for Engineering Applications
AFNOR 25CD4 alloy steel bars are specifically engineered to deliver exceptional strength and toughness. With options for various bars and surface finishes, these steel bars meet exacting standards for use in automotive, aerospace, machinery, and power generation. Their robust mechanical characteristics and flexible heat-treatment options make them adept at withstanding challenging industrial conditions.
Customized Finishes and Sizes
Choose from a broad spectrum of shapes-round, hexagonal, flat, and square bars-available in multiple surface conditions such as bright, polished, and annealed. Ranging from 5 mm up to 400 mm in diameter and lengths up to 6000 mm, the bars can be tailored to your precise requirements, making them an excellent fit for diverse, high-strength components.
FAQ's of AFNOR 25CD4 Alloy Steel Chrome Moly Bars:
Q: How are AFNOR 25CD4 Alloy Steel Chrome Moly Bars manufactured?
A: These bars are produced using advanced forging, rolling, peeling, or turning processes in Indian and European mills. They undergo controlled heat treatments such as normalizing, quenching, tempering, or annealing as per the intended application and required mechanical properties.Q: What testing methods are applied to these steel bars for quality assurance?
A: AFNOR 25CD4 bars are rigorously tested using ultrasonic, eddy current, mechanical, chemical, and non-destructive testing (NDT) techniques. These ensure compliance with industry standards and the absence of internal and surface defects.Q: Where can these bars be effectively utilized?
A: Their robust mechanical properties and customizable features succeed in automobile industries, structural engineering, machinery manufacturing, aerospace, oil & gas, and power generation sectors-especially where high strength, toughness, and wear resistance are essential.Q: When is a specific surface finish or hardness recommended?
A: The choice of finish and hardness depends on the application: bright or polished surfaces offer enhanced aesthetics and dimensional accuracy, while specific hardness levels are tailored as per technical requirements to maximize wear resistance or machinability.Q: What are the benefits of using AFNOR 25CD4 alloy steel bars in critical components?
A: These alloy bars provide exceptional durability, high strength-to-weight ratio, excellent resistance to fatigue, and adaptability to varied environments, making them ideal for demanding mechanical applications such as shafts, gears, and fasteners.Q: How is the product packaged and delivered?
A: Delivery conditions can be as rolled, annealed, or quenched and tempered, packed as bundles, in wooden boxes, or plastic wrapped as requested, ensuring safe transportation and protection from environmental impacts during transit.Tell us about your requirement
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