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Alloy Steel 1.6745 Round Bar 1.6745 Bars 1.6745 Rods
96.0 INR/Kilograms
Product Details:
- Material Alloy Steel 1.6745
- Length 100 mm to 6000 mm or custom lengths
- Type Round Bar, Bars, Rods
- Application Construction, Engineering, Machinery, Manufacturing Industries
- Diameter 5 mm to 350 mm
- Finish Bright, Black, Rough Turned, Peeled
- Processing Annealed, Normalized, Quenched and Tempered
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Alloy Steel 1.6745 Round Bar 1.6745 Bars 1.6745 Rods Price And Quantity
- 1 Kilograms
- 96.0 INR/Kilograms
Alloy Steel 1.6745 Round Bar 1.6745 Bars 1.6745 Rods Product Specifications
- Bright, Black, Rough Turned, Peeled
- 100 mm to 6000 mm or custom lengths
- Alloy Steel 1.6745
- Construction, Engineering, Machinery, Manufacturing Industries
- Round Bar, Bars, Rods
- 5 mm to 350 mm
- h9, h11 or as specified
- Annealed, Normalized, Quenched and Tempered
- DIN 1.6745, EN 16CrMo44, BS 817M40
- 1.6745 (16CrMo44)
- Axles, Shafts, Gears, Engineering Components
- Hot Rolled, Forged, Cold Drawn
- 850 - 1100 MPa
- Round, Square, Hexagonal Bars
- 7.85 g/cm3
- Machined, Polished, Peeled
- Bundled or Loose, as per customer requirement
- As Rolled / Annealed / Hardened & Tempered
- Quenching + Tempering, Annealed
- 12%
- Straightened, Peeled, Polished
- 220 - 280 HB
- 650 MPa
Product Description
1.6745 (European designation: 40NiMoCr10-5) is a premium, high-strength, ultra-high-hardenability nickel-chromium-molybdenum alloy steel. In engineering and commercial trade, it is most widely recognized under the British aerospace standards BS S99 (and its high-tensile sibling BS S98) as well as BS 970 826M40 (formerly EN26).
Because of its high nickel and molybdenum content, 1.6745 possesses outstanding through-hardening capabilities, ensuring uniform mechanical properties even in heavy, large-diameter cross-sections.
Here is the technical profile for 1.6745 alloy bars, round bars, and rods:
Chemical Composition (%)
The high concentration of alloying elementsspecifically Nickel, Chromium, and Molybdenumcombats temper brittleness while maximizing toughness and fatigue resistance under cyclic loads.
| Element | Min (%) | Max (%) |
| Carbon (C) | 0.36 | 0.44 |
| Nickel (Ni) | 2.30 | 2.80 |
| Chromium (Cr) | 0.50 | 0.80 |
| Molybdenum (Mo) | 0.45 | 0.65 |
| Manganese (Mn) | 0.45 | 0.70 |
| Silicon (Si) | 0.10 | 0.35 |
| Phosphorus (P) | 0.025 | |
| Sulfur (S) | 0.015 |
International Equivalents & Cross-References
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Werkstoff Number: 1.6745
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EN / DIN Standard: 40NiMoCr10-5
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British Standards (UK): BS S99, BS S98, 826M40, EN26
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USA / AISI Equivalent: Closely relates to AISI 4340 / 4330V variants, but 1.6745 features a distinctly higher molybdenum content for superior deep-hardening resistance.
Mechanical Properties (Typical in Quenched & Tempered Condition)
When supplied in the fully hardened and tempered (+QT) statethe typical delivery condition for high-integrity components1.6745 achieves formidable mechanical strength:
-
Tensile Strength ($R_m$): $1000 - 1200 text{ MPa}$ (Up to $1230 text{ MPa}$ under strict aerospace compliance)
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Yield Strength ($R_e$): $ge 850 text{ MPa}$
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Elongation ($A_5$): $ge 12%$
-
Hardness: Typically 293 352 HB (Brinell)
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Property Retention: Features high structural integrity and excellent creep resistance at elevated operating temperatures, alongside reliable notch toughness at low temperatures.
Typical Applications
Given its premium, "aircraft-quality" pedigree, 1.6745 round bars and rods are chosen for high-stress structural components where failure is not an option:
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Aerospace & Defense: Landing gear assemblies, critical structural airframe parts, high-stress brackets, struts, and engine mounts.
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Heavy Power Transmission: High-torque shafts, heavy-duty gears, drive pinions, and high-load transmission axles.
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Industrial Fasteners: High-tensile, safety-critical structural bolts and specialized clamping hardware exposed to extreme fatigue conditions.
Processing & Supply Characteristics
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Through-Hardening Capability: Can cleanly through-harden in nominal thicknesses up to 6 inches ($152.4text{ mm}$), ensuring the center core matches the outer surface's strength.
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Machinability: Best machined in the annealed condition. When supplied in the pre-hardened and tempered (+QT) condition, carbide or high-performance tooling is required due to its high hardness.
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Welding: Welding is generally not recommended due to the high carbon and alloy content, which risks cold cracking. If unavoidable, specialized preheating, post-weld heat treatment (PWHT), and stress-relieving are mandatory.
Reliable Alloy Steel for Precision Engineering
The 1.6745 alloy steel round bars and rods deliver consistent mechanical properties, making them ideal for critical applications in the engineering, construction, and manufacturing sectors. With customizable hardness, length, processing, and finishing options, these products ensure maximum adaptability and superior performance, facilitating precise component fabrication and operational efficiency.
Versatile Shapes and Superior Surface Finishes
Available in round, square, and hexagonal shapes, Alloy Steel 1.6745 bars and rods can be provided with finishes ranging from bright and polished to rough-turned and peeled. This versatility allows compatibility with a wide scope of processes, including hot rolled, cold drawn, and forged techniques, catering to diverse project specifications and aesthetic preferences.
FAQ's of Alloy Steel 1.6745 Round Bar 1.6745 Bars 1.6745 Rods:
Q: How are Alloy Steel 1.6745 round bars and rods processed for different applications?
A: These bars and rods can be processed through hot rolling, cold drawing, or forging, followed by surface treatments such as machining, polishing, or peeling. Heat treatments like annealing, quenching, and tempering further enhance their mechanical properties, ensuring suitability for varied engineering uses.Q: What benefits does the 1.6745 alloy steel grade offer for construction and machinery industries?
A: The 1.6745 grade provides excellent tensile and yield strength, moderate hardness, and good elongation, ensuring high durability and resistance to fatigue in axles, gears, and shafts. Its adaptability in shape, size, and finish makes it a preferred choice for precision engineering components.Q: Where can Alloy Steel 1.6745 bars and rods be used?
A: They are widely applied in manufacturing machinery parts, axles, shafts, and gears, as well as in construction and engineering projects requiring robust materials with consistent mechanical characteristics.Q: What surface and delivery conditions are available for these steel bars and rods?
A: You can select from machined, polished, peeled, annealed, quenched, tempered, and normalized surface finishes. Delivery can be made in as-rolled, annealed, or hardened and tempered states, and the supply condition includes straightened, peeled, and polished forms.Q: When should I choose a specific heat treatment like quenching and tempering for 1.6745 rods?
A: Quenching and tempering should be selected when higher mechanical strength and toughness are required, especially for components exposed to dynamic loads or wear, such as gear shafts and axles in heavy machinery.Q: How are Alloy Steel 1.6745 bars packaged and supplied?
A: These products are available in lengths from 100 mm to 6000 mm (or custom), and can be supplied bundled or loose according to customer specification. Tolerance levels such as h9 and h11 can be met to ensure precision in delivery.Tell us about your requirement
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