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Chrome Moly DIN 1.6565 Alloy Steel Bars
150.0 INR/Kilograms
Product Details:
- Diameter 20mm to 300mm or as required
- Grade DIN 1.6565 / 18NiCrMo5
- Material Chrome Moly DIN 1.6565 Alloy Steel
- Standard DIN 1.6565
- Tolerance H11, H13, h12 or as specified
- Application Engineering, Automotive, Power Generation, Structural Applications
- Specific Use Gears, Shafts, High-Stress Components
- Click to view more
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Chrome Moly DIN 1.6565 Alloy Steel Bars Price And Quantity
- 1 Kilograms
- 150.0 INR/Kilograms
Chrome Moly DIN 1.6565 Alloy Steel Bars Product Specifications
- DIN 1.6565 / 18NiCrMo5
- 20mm to 300mm or as required
- Chrome Moly DIN 1.6565 Alloy Steel
- Hot Rolled / Cold Drawn
- Alloy Steel Bar
- Forged, Rolled, Peeled
- Custom / As Required
- Black/Polished
- DIN 1.6565
- H11, H13, h12 or as specified
- Engineering, Automotive, Power Generation, Structural Applications
- Gears, Shafts, High-Stress Components
- As Rolled, Annealed, or as per requirement
- Square Bar
- Sharp or Rounded as specified
- As per supplier policy
- Standard export packaging or as requested
- 230-290 HB (typical, depends on heat treatment)
- Straightened and Inspected
- Bright, Peeled, Polished, or Black
- Normalized, Quenched and Tempered, Annealed
- Nickel, Chromium, Molybdenum Enhanced
Product Description
DIN 1.6565 (standardized as 40NiCrMo6) is a premier, ultra-high-strength Nickel-Chromium-Molybdenum alloy steel. While frequently grouped broadly into the "Chrome Moly" family due to its chromium and molybdenum content, it is more accurately classified as a heavy-duty Ni-Cr-Mo triple-alloy steel.
When ordered in bar form (round, flat, or forged), DIN 1.6565 is the material engineers turn to when standard chrome-moly steels (like 42CrMo4 / AISI 4140) hit their performance limitsspecifically regarding deep through-hardening capability and extreme shock absorption.
1. The Power of the Triple-Alloy: Why Choose 1.6565?
Compared to standard chrome-moly grades, DIN 1.6565 introduces a significant dose of Nickel ($sim$1.40% to 2.00%). This makes a massive physical difference:
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Massive Hardenability (Through-Hardening): In standard chrome moly, large diameter bars (e.g., over 100mm) suffer from "slack quenching"the core doesn't cool fast enough to fully harden, leaving a soft center. The nickel and molybdenum in 1.6565 delay transformation, allowing bars up to 250mm to achieve uniform, ultra-high strength from the outer skin straight to the dead center.
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Extreme Fracture Toughness: Nickel dramatically lowers the ductile-to-brittle transition temperature. This means 1.6565 bars can absorb massive, violent shock loads at freezing temperatures without fracturing.
2. Chemical Composition Breakdown
The exceptional mechanical properties of DIN 1.6565 bars are derived from this precise chemical formulation:
| Element | Composition (%) | Core Contribution |
| Carbon (C) | $0.35% - 0.45%$ | Yields high base tensile strength and responsiveness to tempering. |
| Nickel (Ni) | $1.40% - 2.00%$ | Essential for deep-core hardenability, low-temperature toughness, and shock resistance. |
| Chromium (Cr) | $0.90% - 1.40%$ | Boosts surface hardness, depth of hardening, and clean wear resistance. |
| Molybdenum (Mo) | $0.20% - 0.30%$ | Combats temper brittleness, preserves high-temperature strength, and refines grain structure. |
| Manganese (Mn) | $0.50% - 0.80%$ | Works as a deoxidizer and aids deep through-hardening during heat treatment. |
| Silicon (Si) | $0.15% - 0.35%$ | Increases overall elasticity and tensile properties. |
3. Typical Supply Conditions & Mechanical Values
Depending on your production workflow, DIN 1.6565 alloy steel bars are generally supplied in two states:
Soft Annealed State (+A)
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Hardness: $le$ 260 HB (Brinell)
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Usage: Recommended if your components require complex CNC milling, deep drilling, or spline cutting. Machining in this state maximizes tool life and keeps residual stresses low before final heat treatment.
Quenched & Tempered State (+QT)
Most critical engineering applications purchase bars pre-treated to the Quenched and Tempered condition. The yield values remain high even across large bar diameters:
| Bar Diameter (d) | Yield Strength (Re, min) | Tensile Strength (Rm) | Impact Energy (KV, min) |
| $le$ 16 mm | 835 MPa | 1030 1230 MPa | 30 Joules |
| 40 mm 100 mm | 735 MPa | 930 1130 MPa | 30 Joules |
| 100 mm 160 mm | 665 MPa | 850 1030 MPa | 30 Joules |
| 160 mm 250 mm | 635 MPa | 780 980 MPa | 30 Joules |
4. Key Industrial Applications
DIN 1.6565 bars are manufactured into massive, safety-critical components operating under high-stress environments:
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Aerospace & Defense: Structural landing gear assemblies, high-load bomb racks, propeller hubs, and airframe fasteners.
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Heavy Machinery & Automotive: Heavy-duty crankshafts, connection rods, highly-stressed transmission gears, pinion shafts, and steering knuckles.
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Power Transmission: Large industrial turbine rotors, primary drive shafts, and high-torque gearboxes.
5. Global Material Equivalents
When reading international blueprints or sourcing material globally, DIN 1.6565 aligns tightly with these premium grades:
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USA: AISI 4340 / SAE 4340 (The closest and most widely recognized equivalent)
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International Standards: 40NiCrMo6
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France (AFNOR): 40NCD3 / 40NCD7
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UK (BS): 817M40 (often associated with the classic EN24 capability)
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Russia (GOST): 40KhN2MA (402)
Welding Caution: Due to the high carbon equivalent and significant alloy content, welding DIN 1.6565 is highly restricted. If welding is mandatory, rigorous pre-heating ($sim$ 250C to 300C), specialized low-hydrogen filler metals, and immediate post-weld heat treatment (PWHT) are vital to prevent hydrogen-induced cracking.
Superior Alloy Composition for Reliability
DIN 1.6565 alloy steel bars incorporate nickel, chromium, and molybdenum to ensure optimal strength, toughness, and wear resistance. This composition makes them a preferred choice for precision gear manufacturing, high-stress shafts, and other demanding structural applications in engineering and power generation.
Versatile Processing and Customization
Choose from hot rolled, cold drawn, forged, or peeled processing methods to match specific engineering requirements. Finishes include bright, polished, black, or peeled, while heat treatments such as annealing, normalizing, or quenching and tempering further adapt the bars for your unique operational environment.
Flexible Sizing, Packaging, and Delivery
Available in square shapes with diameters from 20mm to 300mm, DIN 1.6565 bars can be customized in length, tolerance (H11, H13, h12), and edge condition. Delivery states are straightened and inspected to ensure quality, and packaging can be standard export or tailored to customer request.
FAQ's of Chrome Moly DIN 1.6565 Alloy Steel Bars:
Q: How are Chrome Moly DIN 1.6565 alloy steel square bars processed to achieve desired properties?
A: These alloy steel bars undergo processes such as forging, hot rolling, peeling, and polishing to achieve the required dimensions, finish, and mechanical properties. They are then heat treated (annealed, normalized, or quenched and tempered) based on the specific application needs, optimizing hardness and toughness.Q: What applications are best suited for DIN 1.6565 steel bars?
A: DIN 1.6565 alloy steel bars are ideal for engineering, automotive, power generation, and structural uses. Their robust composition makes them suitable for gears, shafts, and other high-stress components, especially where strength and wear resistance are critical.Q: When should I opt for a polished versus a black surface finish on these bars?
A: A polished finish is typically chosen for aesthetic appeal or when lower friction and smoother surfaces are required, such as in moving parts. Black finishes are advantageous for offering basic corrosion resistance and are commonly selected for structural applications where appearance is less crucial.Q: Where can I source DIN 1.6565 alloy steel bars in India?
A: You can acquire DIN 1.6565 bars from a network of manufacturers, dealers, exporters, and suppliers throughout India. Many offer tailored solutions, custom dimensions, and export-quality packaging based on project requirements.Q: What are the benefits of using DIN 1.6565 bar with nickel, chromium, and molybdenum content?
A: The addition of nickel, chromium, and molybdenum enhances the steel's toughness, strength, and resistance to wear and fatigue. This combination extends service life and reliability when used in load-bearing or high-stress environments.Q: How is quality and precision ensured during the supply of these bars?
A: Every steel bar is straightened and thoroughly inspected for defects before delivery. Tolerances such as H11, H13, or h12 are maintained according to customer specifications, and edges can be provided either sharp or rounded based on design needs.Tell us about your requirement
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