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AFNOR 42CD4 Alloy Steel Chrome Moly Bars
75.0 INR/Kilograms
Product Details:
- Tolerance h8, h9, h10, or as required
- Finish Bright, Peeled, Polished, Turned, Ground
- Standard AFNOR 42CD4
- Processing Heat Treated, Quenched & Tempered
- Technique Hot Rolled / Cold Drawn
- Type Chrome Moly Bars
- Application Engineering, Automobile, Oil & Gas, Power Plant, Structural, and Machinery Parts
- Click to view more
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AFNOR 42CD4 Alloy Steel Chrome Moly Bars Price And Quantity
- 75.0 INR/Kilograms
- 1 Kilograms
AFNOR 42CD4 Alloy Steel Chrome Moly Bars Product Specifications
- Cut to Size / Customized
- Bright, Peeled, Polished, Turned, Ground
- 42CD4
- h8, h9, h10, or as required
- Alloy Steel 42CD4 (AFNOR Standard)
- 10mm to 300mm (custom sizes available)
- Chrome Moly Bars
- Engineering, Automobile, Oil & Gas, Power Plant, Structural, and Machinery Parts
- AFNOR 42CD4
- Heat Treated, Quenched & Tempered
- Hot Rolled / Cold Drawn
- Crankshafts, Gears, Connecting Rods, Shafts, Bolts, Automotive and Mechanical Components
- As per customer specification
- Round Bar
- 7.85 g/cm3
- Annealed / Hardened & Tempered
- Good
- Standard Export Seaworthy Packing
- Moderate, Improved by Chrome and Molybdenum Content
- Provided with dispatch
- As per requirement
- 500 Metric Tons/month
- Good (with suitable procedure)
- Smooth Surface
Product Description
AFNOR 42CD4 (commonly categorized today under the European standard as 42CrMo4 or material number 1.7225) is arguably the most widely used high-tensile chrome-moly engineering steel in industrial manufacturing.
Featuring a mid-range carbon content (around 0.42%), 42CD4 is designed primarily as a through-hardening alloy. It hits an exceptional balance of high strength, excellent fatigue limits, and high impact toughness, making it the bedrock material for components that must endure continuous, punishing mechanical loads without succumbing to structural failure.
Global Equivalents
Because 42CD4 is an absolute staple across international supply chains, it directly corresponds to these major global standards:
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USA (AISI/SAE): AISI 4140 / UNS G41400
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Germany (DIN / WNr): 42CrMo4 / 1.7225
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UK (BS): 708M40 (En19)
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Japan (JIS): SCM440
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Italy (UNI): 42CrMo4
Chemical Composition (Typical %)
The synchronized blend of chromium and molybdenum provides excellent depth of hardenability when quenched, while the 0.42% carbon allows the alloy to reach high tensile profiles without becoming inherently brittle.
| Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
| 0.38% 0.45% | 0.90% 1.20% | 0.15% 0.30% | 0.60% 0.90% | 0.40% | 0.025% | 0.035% |
Mechanical Properties (Condition T / +QT)
42CD4 round bars are most frequently specified and delivered in the Quenched and Tempered (+QT) conditionspecifically targeting Condition T, which optimizes the microstructure into tempered martensite.
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Tensile Strength ($R_m$): 850 1000 MPa (N/mm)
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Yield Strength ($R_{e}$): 650 MPa
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Elongation ($A_5$): 13%
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Impact Energy (Charpy-V): 50 J
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Hardness Range: 248 302 HBW (Pre-hardened supply condition)
Key Technical Characteristics
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Uniform Hardenability: While it doesn't have the massive cross-sectional hardening depth of nickel-bearing steels like 4340 (EN24), it through-hardens beautifully in typical bar diameters (up to roughly 100mm) via oil quenching.
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Surface Hardening Responsiveness: For components requiring high localized wear resistance, 42CD4 responds incredibly well to induction hardening or nitriding, elevating localized surface hardness up to 5560 HRC while leaving the high-tensile core completely intact.
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Machinability: In the standard pre-hardened condition (Condition T), it exhibits very predictable and clean chip formation when paired with modern coated carbide tooling.
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Fabrication Warning: Due to the higher carbon level, 42CD4 is not easily welded. If welding is absolutely unavoidable, it requires strict pre-heating ($200text{C} - 300text{C}$) and immediate post-weld stress relieving to prevent heat-affected zone (HAZ) cracking.
Common Industrial Applications
Because it handles intense torsional stress, high pressures, and repetitive shock brilliantly, 42CD4 bars are heavily utilized for:
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Power Transmission: High-torque drive shafts, axles, crankshafts, connector rods, and industrial gears.
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Fasteners & Clamping: High-tensile studs, heavy-duty structural bolts, tie-rods, and specialized double-bolted clamping bars.
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Oil & Gas Hardgoods: Drill collars, valve blocks, tool joints, and high-pressure stage adapters.
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Machine Tooling: Ejector pins, tool holders, structural wear rings, and high-load hydraulic piston rods.
High-Performance Alloy Steel for Demanding Applications
AFNOR 42CD4 Chrome Moly Bars combine outstanding strength, toughness, and moderate corrosion resistance, making them best suited for stressed mechanical parts. Chrome and molybdenum content improve performance in high-load environments, while precision tolerances and diverse finishes accommodate complex engineering and automotive needs.
Custom Specifications to Match Exact Project Needs
We offer full flexibility: from 10mm to 300mm diameter, custom lengths, cut-to-size, and specified tolerances (h8, h9, h10, or as required). Hardness and delivery condition (annealed or quenched & tempered) are tailored per customer request, ensuring our products meet exact project and industry standards.
Reliability and Quality Assurance with Every Order
Every batch comes with complete test certification and standard seaworthy export packaging for assured quality and safety during transit. With a monthly capacity of 500 metric tons, timely delivery and consistent supply are guaranteed for bulk buyers and customized small orders alike.
FAQ's of AFNOR 42CD4 Alloy Steel Chrome Moly Bars:
Q: How are AFNOR 42CD4 Alloy Steel Chrome Moly Bars processed for optimal performance?
A: These bars undergo advanced processes such as heat treatment, quenching, and tempering to enhance strength, toughness, and machinability. The surface is finished by bright, peeled, turned, polished, or ground methods to meet precise application demands.Q: What industries commonly use AFNOR 42CD4 Chrome Moly Bars?
A: Industries such as engineering, automotive, oil & gas, power plants, and structural fabrication frequently utilize these bars because of their mechanical strength and good weldability.Q: When is a test certificate provided for these alloy steel bars?
A: A test certificate detailing material composition and mechanical properties is provided with every dispatch, ensuring total traceability and compliance with quality standards.Q: Where are these bars manufactured and supplied from?
A: They are manufactured in India by leading producers, exporters, and suppliers, with comprehensive supply capability to meet both domestic and international project orders.Q: What benefits do Chrome and Molybdenum contents offer in 42CD4 Round Bars?
A: The addition of chromium and molybdenum enhances the bar's corrosion resistance, increases high-temperature performance, and ensures durable service under mechanical stress.Q: How is the corrosion resistance of these bars rated?
A: The corrosion resistance is moderate, but significantly improved over standard steels due to their alloying with chrome and molybdenum, making them suitable for harsh and demanding environments.Q: What makes these bars suitable for custom applications?
A: Customizable hardness, size, tolerance, length, and surface finish allow these bars to be tailored to specific uses such as crankshafts, gears, bolts, and connecting rods, supporting a wide range of mechanical and structural components.Tell us about your requirement
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