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Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods

Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods

118.0 INR/Kilograms
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Product Details:

  • Diameter 10 mm to 500 mm
  • Standard ASTM, AISI, DIN, EN, BS, JIS
  • Application Automobile, Engineering, Construction, and Machinery
  • Material Alloy Steel 40NiMoCr10-5
  • Technique Hot Rolled, Cold Drawn, Forged
  • Tolerance H9, H11, K12, or as per requirements
  • Processing Quenched and Tempered
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Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods Price And Quantity

  • 118.0 INR/Kilograms
  • 1 Kilograms

Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods Product Specifications

  • ASTM, AISI, DIN, EN, BS, JIS
  • 10 mm to 500 mm
  • Automobile, Engineering, Construction, and Machinery
  • Alloy Steel 40NiMoCr10-5
  • Hot Rolled, Cold Drawn, Forged
  • 40NiMoCr10-5
  • Round Bar, Rods
  • Quenched and Tempered
  • H9, H11, K12, or as per requirements
  • 1 Meter to 6 Meter
  • Bright, Black, Polished
  • Shafts, Gears, Structural Components
  • 225-290 HB
  • Quench + Temper
  • Peeled, Turned, Polished
  • Minimum 1080 MPa
  • 12% min
  • 35J min at -20C
  • Minimum 880 MPa
  • Annealed, Hardened and Tempered

Product Description

Since 40NiMoCr10-5 is the exact alphanumeric EN/DIN designation for the material number 1.6745 we just looked at, you are dealing with the exact same ultra-high-strength, deep-hardening aerospace and heavy-engineering alloy steel.

Because it is widely traded under both the name 40NiMoCr10-5 and the British Standards BS S99 / 826M40 (EN26), here is a practical guide on procurement specifications, sizing tolerances, and machining advice for these bars and rods.

Standard Sizing & Supply Conditions

When sourcing 40NiMoCr10-5 round bars and rods, they are typically processed to specific surface finishes and structural conditions depending on how you plan to machine them:

Common Surface Finishes

  • Black Hot-Rolled / Forged: Features a dark oxide scale from the mill. Best if you plan to do heavy rough-machining or further forging.

  • Peeled / Bright Turned: The outer scale is mechanically removed, offering tighter dimensional tolerances and making it ready for automated CNC lathe work.

  • Cold Drawn / Ground: Provided with smooth, highly precise outer diameter tolerances, ideal for high-precision machining or direct use as shafts.

Delivery States

  • Soft Annealed (+A): Supplied at a lower hardness (typically under 250 HB). This is the best state to buy if your parts require intricate, heavy milling or deep drilling before you perform your own final quenching and tempering.

  • Quenched and Tempered (+QT): Pre-hardened at the mill to its signature 10001200 MPa tensile strength range. Buying it "+QT" eliminates the risk of part distortion or cracking during your own heat treatment, though it is tougher on your cutting tools.

Quick Technical Snapshot (40NiMoCr10-5)

Metric Specification Detail
Core Alloy Mix High Nickel ($2.5%$) for toughness, Chromium ($0.65%$) for hardness, Molybdenum ($0.55%$) to prevent temper brittleness.
Hardenability Exceptional. It achieves uniform through-hardening in massive cross-sections up to $150text{ mm}$ (approx. 6 inches) in diameter.
Key Equivalents Material WNr 1.6745, BS S99, BS S98, EN26, 826M40.

Practical Machining & Fabrication Tips

  • Tooling for Pre-Hardened (+QT) Bars: If you are turning 40NiMoCr10-5 in its pre-hardened state, utilize rigid machine setups, heavy-duty carbide tooling, and constant, sulfurized cutting oils or high-pressure coolants to manage heat build-up and prevent work-hardening.

  • Managing Hydrogen Embrittlement: If your finished 40NiMoCr10-5 components are destined for acid-pickling, heavy electroplating, or phosphating, they must be baked immediately afterward (typically around $190^circtext{C}$ to $210^circtext{C}$) to drive out trapped hydrogen and prevent catastrophic brittle fracturing under load.

  • Avoid Conventional Welding: Due to the high alloy content, welding creates an incredibly brittle martensitic zone next to the weld. If a component must be repaired or joined, strict preheating to around $300^circtext{C}$ is necessary, followed immediately by a controlled post-weld stress relief or full re-tempering cycle.



Exceptional Mechanical Properties

The 40NiMoCr10-5 bars and rods offer high yield (880 MPa min) and tensile strength (1080 MPa min), ensuring robust performance in structural, automotive, and machinery applications. Enhanced elongation and good impact resistance at sub-zero temperatures make them suitable for critical engineering uses, where safety and reliability are paramount.


Versatile Processing and Finishing Options

Customers can choose from a variety of surface conditions-peeled, turned, polished-as well as bright and black finishes to suit specific application requirements. The bars are available in hot rolled, cold drawn, or forged forms, and can be supplied in custom tolerances (H9, H11, K12) to meet precise design specifications.


Heat Treatment for Superior Performance

Through a combination of quenching and tempering, these alloy steel bars achieve optimal hardness (225-290 HB), strength, and ductility. The controlled heat treatment process ensures each bar meets stringent material standards and performs reliably under demanding operational conditions.

FAQ's of Alloy Steel 40NiMoCr10-5 Round Bar 40NiMoCr10-5 Bars & Rods:


Q: How are Alloy Steel 40NiMoCr10-5 Round Bars typically processed to achieve their properties?

A: These bars undergo heat treatments such as quenching and tempering, resulting in a balanced combination of hardness (225-290 HB), strength, and ductility. Processing methods may include hot rolling, cold drawing, or forging, followed by annealing or hardening, depending on the required application.

Q: What are the main applications of 40NiMoCr10-5 bars and rods?

A: They are widely used in the automotive, construction, engineering, and machinery industries, commonly serving as shafts, gears, and structural components where high strength and durability are necessary.

Q: When should I opt for a peeled or polished surface condition?

A: Peeled or polished finishes are preferred when surface quality and dimensional precision are critical, such as in components that require optimal fatigue resistance or specific fitting tolerances.

Q: Where can Alloy Steel 40NiMoCr10-5 products be sourced from Hong Kong S.A.R.?

A: These bars and rods are available through authorized dealers, exporters, manufacturers, retailers, and suppliers in Hong Kong S.A.R., offering a comprehensive supply chain for both local and international clients.

Q: What standards do these alloy steel bars conform to?

A: They are manufactured in accordance with global standards such as ASTM, AISI, DIN, EN, BS, and JIS, ensuring consistent quality and compatibility with international engineering specifications.

Q: How does the heat treatment process benefit the end use of these bars?

A: Quenching and tempering result in higher mechanical strength, better wear resistance, and improved toughness, making the bars well-suited for demanding applications exposed to mechanical stress and impact.

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