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WNr 1.7147 Alloy Steel Bar 1.7147 Round Bars 1.7147 Rods
95.0 INR/Kilograms
Product Details:
- Processing Annealed, Peeled, Polished
- Technique Hot Rolled
- Length 100mm to 6000mm or as required
- Application Automotive, engineering, construction, and machinery parts
- Material WNr 1.7147 Alloy Steel
- Diameter 10mm to 350mm
- Grade 1.7147 / 20MnCr5
- Click to view more
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WNr 1.7147 Alloy Steel Bar 1.7147 Round Bars 1.7147 Rods Price And Quantity
- 95.0 INR/Kilograms
- 1 Kilograms
WNr 1.7147 Alloy Steel Bar 1.7147 Round Bars 1.7147 Rods Product Specifications
- Gear components, transmission parts, shafts, crankshafts
- Round Bar / Rod
- H8, H9, H10 or as required
- DIN 1.7147 / 20MnCr5
- 100mm to 6000mm or as required
- Hot Rolled
- Annealed, Peeled, Polished
- 10mm to 350mm
- Automotive, engineering, construction, and machinery parts
- WNr 1.7147 Alloy Steel
- Bright, Black, Polished
- 1.7147 / 20MnCr5
- min 900 MPa (after heat treatment)
- min 700 MPa (after heat treatment)
- 160-240 HB (annealed)
- Mn 1.10-1.40%, Cr 0.80-1.10%
- Smooth, Free from scale
- Annealed / Hardened / Tempered
- Round Bar, Rod, Bright Bar, Forged Bar
- Bundled, seaworthy packing
- min 8% (after heat treatment)
- 100 kgs
- min 30J at -20C
- As rolled / Heat Treated
Product Description
An Alloy Steel Bar is a solid cylindrical, square, or rectangular length of steel that has been alloyed with elements like chromium, manganese, nickel, molybdenum, or boron. Unlike standard carbon steel, these deliberate additions alter the chemical structure to provide enhanced hardenability, toughness, wear resistance, and fatigue strength.
Because "alloy steel bar" is a massive category, bars are generally classified by how they are heat-treated and their primary industrial function.
The Main Classes of Alloy Steel Bars
Alloy steel round bars, rods, and flats are broadly split into three metallurgical categories based on their carbon content and intended application:
1. Through-Hardening Steels (Medium Carbon)
These steels feature a medium carbon content (typically $0.35% - 0.50%$) along with chromium, molybdenum, and nickel. They are designed to be hardened uniformly from the outer surface all the way through to the center core.
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Key Grades: AISI 4140 (42CrMo4), AISI 4340 (34CrNiMo6), AISI 1045, AISI 5140.
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Properties: High tensile strength, exceptional fatigue resistance, and uniform core toughness.
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Best Used For: High-torque drive shafts, crankshafts, structural aerospace brackets, and heavy-duty structural fasteners.
2. Case-Hardening / Carburizing Steels (Low Carbon)
These steels have a low carbon base (typically $0.12% - 0.22%$). Components are machined in a soft state and then placed in a carbon-rich furnace (carburized). This creates a glass-hard, wear-resistant outer "case" while preserving a highly ductile, shock-absorbing core.
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Key Grades: 20MnCr5 (1.7147), 16MnCr5 (1.7131), AISI 8620, AISI 5120, GOST 15KH.
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Properties: Extreme surface wear resistance, high resistance to scuffing, and exceptional impact-shock absorption.
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Best Used For: Transmission gears, steering worms, piston pins, universal joint spiders, and splined shafts.
3. Boron-Alloyed Steels (Low-to-Medium Carbon)
By adding microscopic amounts of Boron ($0.0008% - 0.0050%$), mills can drastically increase the hardenability of carbon-manganese steel without adding expensive quantities of nickel or molybdenum.
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Key Grades: 27MnCrB5-2 (1.7182), 30MnB5, 51B30.
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Properties: Cost-effective, highly responsive to quenching, excellent wear-resistance.
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Best Used For: Agricultural wear plates, plowshares, rotary tiller blades, and high-strength fasteners (Grade 10.9/12.9).
Delivery Conditions & Surface Finishes
When procuring alloy steel bars, the manufacturing method and finish dictate how easily the material can be machined:
| Bar Finish Type | Processing Method | Surface Appearance | Dimensional Precision | Ideal Downstream Use |
| Hot-Rolled (HR) | Rolled at elevated temperatures ($>1000^circtext{C}$). | Dark, rough oxide scale ("black bar"). | Lower tolerance; requires machining allowance. | Forging, rough machining, or structural frames. |
| Peeled / Turned | Outer oxide scale is mechanically shaved off. | Bright, smooth, circular score lines. | High precision (typically ISO h11/h12). | Direct feeding into CNC lathes or turning centers. |
| Cold-Drawn (CD) | Pulled through a sizing die at room temperature. | Highly reflective, smooth, clean. | Extremely precise (typically ISO h9/h10). | Swiss-turning, linear guide rods, high-speed automated production. |
| Centerless Ground | Intensely polished using precision grinding wheels. | Mirror-like, ultra-smooth. | Maximum precision (ISO h6 to h8). | High-rpm rotating shafts, bearings, and high-vibration applications. |
Key Thermal Suffixes to Watch For
When reviewing a material certificate or buying bill for an alloy bar, look closely at the thermal treatment suffix:
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+AR (As Rolled): The bar is unheated after forming. Hardness can be inconsistent.
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+A (Soft Annealed): Microstructure is optimized for lowest possible hardness. Pick this if you have a lot of deep drilling or complex milling to do before your final heat treat.
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+FP (Ferrite-Pearlite Treatment): Specifically treated to a consistent hardness band designed to prevent tool "gumminess" and ensure perfect chip breaking during gear hobbing or high-speed turning.
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+QT (Quenched & Tempered): Fully pre-hardened at the mill to its final working strength. It is tougher to machine, but eliminates the risk of part distortion or cracking during post-machining heat treatment.
Exceptional Mechanical Performance
After heat treatment, WNr 1.7147 alloy steel achieves a yield strength of at least 700 MPa and a tensile strength of 900 MPa, with a minimum elongation of 8% and impact value of 30J at -20C, making it highly reliable for demanding applications.
Diverse Industry Uses
This steel is an excellent choice for making gear components, transmission parts, shafts, crankshafts, and other critical machinery pieces, largely due to its robust alloy composition and consistent mechanical properties.
Versatile Processing and Finish Options
WNr 1.7147 bars and rods are available in a range of processing conditions including annealed, hardened, and tempered. Customers can choose from bright, black, or polished finishes, with each bar meticulously crafted to specified diameter and tolerance requirements.
FAQ's of WNr 1.7147 Alloy Steel Bar 1.7147 Round Bars 1.7147 Rods:
Q: How is WNr 1.7147 alloy steel bar processed to achieve specific mechanical properties?
A: The steel bars can be annealed, hardened, or tempered as per application requirements. After appropriate heat treatment, the bars achieve a minimum yield strength of 700 MPa and tensile strength of 900 MPa, ensuring superior durability and performance.Q: What are the primary applications of WNr 1.7147 alloy steel bars and rods?
A: These alloy steel bars are widely used in automotive, engineering, construction, and machinery industries for producing gear components, transmission parts, shafts, crankshafts, and other precision parts requiring high strength.Q: When should you opt for different surface finishes and processing types?
A: Surface finish and processing depend on the intended use: bright or polished finishes are preferred for visible or high-precision parts, while black finish is suitable for structural applications. Annealed bars are easier to machine, whereas hardened and tempered bars offer enhanced strength.Q: Where can you specify custom dimensions or tolerances for your steel bars?
A: Custom requirements regarding diameter (10mm-350mm), length (100mm-6000mm), tolerance (H8, H9, H10), and surface finish can be specified at the time of order placement. This ensures you receive bars tailored to your project's needs.Q: What are the benefits of choosing WNr 1.7147 alloy steel for machine components?
A: Selecting WNr 1.7147 offers benefits such as excellent machinability, high impact resistance at low temperatures, and consistent mechanical properties, making it ideal for high-stress automotive and engineering applications.Q: How are the steel bars packed and delivered?
A: All bars are bundled using seaworthy packing to ensure safety during transit. They are supplied either as rolled or heat-treated, depending on the order and application requirements.Tell us about your requirement
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