4140 Round Bar
4140 Round Bar is a high-strength alloy steel product widely utilized in industrial manufacturing due to its excellent mechanical properties and versatility. Known for its balanced combination of toughness, wear resistance, and fatigue strength, this material is primarily composed of chromium, molybdenum, and manganese, which enhance its hardenability and overall durability. Its round cross-section makes it ideal for machining and fabrication into precision components.
This steel grade is commonly supplied in various diameters and lengths, meeting stringent dimensional tolerances to accommodate diverse engineering requirements. The bars are often heat-treated to achieve desired hardness levels, ensuring optimal performance in demanding environments. The consistent chemical composition and uniform microstructure make it suitable for processes like forging, turning, and milling, which are critical in producing high-quality parts.
Industries such as automotive, aerospace, oil and gas, and heavy machinery heavily rely on this alloy for manufacturing shafts, gears, bolts, and other critical components that require high fatigue resistance and impact strength. Its ability to withstand both static and dynamic loads makes it an essential material in applications where reliability and safety are paramount. Additionally, its corrosion resistance properties extend the service life of finished products.
When it comes to export readiness, the bars are typically supplied with comprehensive certification, including material test reports and compliance with international standards such as ASTM A29 or EN 10083. Packaging is designed to protect against damage during transit, and suppliers often provide customization options to meet specific client needs. This ensures seamless integration into global supply chains and adherence to quality expectations across markets.
Our Approvals | Third Party Inspection
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why 4140 Round Bar Are Preferred by Global Buyers
- ✔ Factory Pricing: Direct manufacturer rates with bulk stock
- ✔ Certified Quality: ISO & 3rd-party tested, EN 10204 certified
- ✔ Export-Ready: Sea-worthy packaging for on-time delivery
- ✔ Fast RFQs: Quick quotes for custom sizes & quantities
- ✔ Traceability: 100% heat number tracking from raw material to finished product
Trusted by industries like oil & gas, petrochemicals, power, marine, and heavy engineering.
- Manufacturing Capacity: 500 MT / Month
- Export Experience: 50+ Years
- Countries Served: 50+
- Annual Export Volume: 5,500 MT
Table of Contents
- 1. What is 4140 Round Bar
- 2. How to Choose the Right Manufacturer
- 3.Comparison of 4140 Round Bar
- 4. Why Global Buyers Source from Super Metal Manufacturing Co.
- 5. Features
- 6. Technical Overview
- 7. Specifications
- 8. Available Grades
- 9. Available Sizes
- 10. Chemical Properties
- 11. Mechanical Properties
- 12. Physical & Thermal Properties
- 13. Electrical Resistivity
- 14. Equivalent Grades
- 15. Manufacturing Process & Heat Treatment
- 16. Various Types
- 17. Applications & Uses
- 18. Industries We Serve
- 19. Latest Price List
- 20. MOQ & Payment Terms
- 21.Export Packaging & Shipping
- 22. Cities We Supply in India
- 23. Countries We Export Worldwide
- 24. Our Certifications
- 25. Quality Inspection & Testing
- 26. Our Other Product Types
- 27. People Also Search For
- 28. Frequently Asked Questions
- 29. About Super Metal Manufacturing Co.
How to Choose the Right 4140 Round Bar
India is home to hundreds of manufacturers ranging from small job shops to large ISO-certified exporters. International and domestic buyers typically evaluate manufacturers based on quality compliance, production capacity, export experience, and pricing transparency.
- Certification & international standards (ASME, ASTM, EN)
- Manufacturing capability vs trading activity
- Export documentation & inspection support
- Stock availability & lead time reliability
- Past supply experience in oil & gas, EPC & heavy industries
Comparison Factors Among 4140 Round Bar
| Evaluation Factor | Small Local Suppliers | Trading Companies | ISO-Certified Manufacturers |
|---|---|---|---|
| Manufacturing Control | Limited | None | Full in-house / audited partners |
| International Standards | Basic | Depends on source | ASME / ASTM / EN |
| Inspection & MTCs | Limited | Inconsistent | EN 10204 3.1 / 3.2 |
| Export Experience | Low | Medium | 50+ countries |
| Risk for EPC Projects | High | Medium | Low |
International buyers typically prefer ISO-certified manufacturers for large-scale or critical applications due to better quality control, documentation, and lower project risk.
Why Global Buyers Choose Super Metal Manufacturing Co.
Super Metal Manufacturing Co. is a trusted ISO 9001:2015 certified manufacturer and global exporter of ferro alloys and metal products, supplying consistent, high-quality materials to customers across USA, UK, Europe, Middle East, Africa, and Asia-Pacific. Our focus on quality assurance, cost efficiency, and on-time delivery makes us a preferred sourcing partner for international buyers.
| Key Advantage | Buyer Benefit |
|---|---|
| ISO 9001:2015 Certified Manufacturing | Consistent quality with documented QA systems and process control |
| ASME / ASTM / EN Compliant Products | Globally accepted standards with EN 10204 3.1 / 3.2 MTCs |
| Lower Manufacturing & Sourcing Costs | Save up to 15–20% compared to European suppliers |
| Favorable Exchange Rate Advantage | Reduced landed cost for international importers |
| In-House Testing & Inspection Facilities | Strict chemical, mechanical & dimensional quality checks |
| Bulk Stock & High Production Capacity | Fast order fulfillment and stable supply for large projects |
| Custom Sizes & Drawing-Based Manufacturing | Products manufactured exactly to buyer specifications |
| Export-Grade Packaging & Global Logistics | Sea-worthy packing, palletization & worldwide shipping support |
| Faster Global Shipping Routes | Optimized logistics for Middle East, Africa & Southeast Asia |
| Technical & After-Sales Support | Project assistance, documentation & responsive RFQ handling |
| Trusted by Global Steel & EPC Companies | Proven export experience across 50+ countries |
Features of 4140 Round Bar
- ✔ High tensile strength for demanding applications
- ✔ Excellent toughness and wear resistance
- ✔ Good machinability and weldability
- ✔ Versatile material suitable for various industries
- ✔ Heat treatable for enhanced properties
- ✔ Available in multiple sizes and lengths
Technical Overview of 4140 Round Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| 4140 Round Bar | 0.38-0.43% Carbon, 0.75-1.00% Manganese, 0.15-0.25% Phosphorus, 0.04-0.06% Sulfur, 0.80-1.10% Chromium, 0.15-0.30% Molybdenum | Used in the manufacturing of gears, axles, and crankshafts, as well as other high-stress applications. | ASTM A829, AISI 4140 |
| 4140 Round Bar | 0.38-0.43% Carbon, 0.75-1.00% Manganese, 0.15-0.25% Phosphorus, 0.04-0.06% Sulfur, 0.80-1.10% Chromium, 0.15-0.30% Molybdenum | Commonly utilized in oil and gas drilling equipment, automotive components, and heavy machinery. | SAE J403, ASTM A322 |
| 4140 Round Bar | 0.38-0.43% Carbon, 0.75-1.00% Manganese, 0.15-0.25% Phosphorus, 0.04-0.06% Sulfur, 0.80-1.10% Chromium, 0.15-0.30% Molybdenum | Ideal for heat-treated applications where strength and toughness are critical. | AMS 6345, ASTM A829 |
Specifications Table
| Material | 4140 Alloy Steel |
|---|---|
| Grades | 4140, 4140HT |
| Standard | ASTM A829, ASME SA829 |
| Size Range | 0.5" to 10" diameter |
| Length | Up to 20 feet |
| Form | Round Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| 4140 Round Bar | 0.38-0.43% C, 0.75-1.00% Mn, 0.15-0.25% Si, 0.80-1.10% Cr, 0.15-0.30% Mo | Used in high-stress applications like gears, axles, and heavy-duty machinery components. |
| 4140 HT Round Bar | 0.38-0.43% C, 0.75-1.00% Mn, 0.15-0.25% Si, 0.80-1.10% Cr, 0.15-0.30% Mo | Ideal for applications requiring higher fatigue strength and toughness. |
| 4140 QT Round Bar | 0.38-0.43% C, 0.75-1.00% Mn, 0.15-0.25% Si, 0.80-1.10% Cr, 0.15-0.30% Mo | Preferred for oil and gas applications, as well as structural components. |
| 4140 Alloy Steel Bar | 0.38-0.43% C, 0.75-1.00% Mn, 0.15-0.25% Si, 0.80-1.10% Cr, 0.15-0.30% Mo | Used in manufacturing tools, dies, and automotive parts. |
| 4140 Modified Round Bar | 0.40% C, 1.00% Mn, 0.25% Si, 1.00% Cr, 0.30% Mo | Utilized in applications requiring enhanced impact and wear resistance. |
Available Sizes of 4140 Round Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 20 | 30 |
| 25 | 35 |
| 28 | 40 |
| 32 | 45 |
| 38 | 50 |
| 42 | 55 |
| 48 | 60 |
| 55 | 70 |
| 60 | 75 |
| 70 | 80 |
Chemical Properties of 4140 Round Bar
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Manganese (Mn) | 0.75 - 1.00 |
| Silicon (Si) | 0.15 - 0.40 |
| Chromium (Cr) | 0.90 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Sulfur (S) | 0.04 max |
| Phosphorus (P) | 0.04 max |
| Iron (Fe) | Balance |
Mechanical Properties of 4140 Round Bar
| Property | Value |
|---|---|
| Tensile Strength | 655 MPa (95 ksi) |
| Yield Strength | 415 MPa (60 ksi) |
| Elongation | 20% |
| Modulus of Elasticity | 210 GPa (30.5 x 106 psi) |
| Hardness (Brinell) | 207 HB |
4140 Round Bar – Physical & Thermal Properties
Density of 4140 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
Melting Point of 4140 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1420 - 1540 °C | 2600 - 2800 °F |
Specific Heat of 4140 Round Bar
| Specific Heat of 4140 Round Bar | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 460 | 20 - 100 | Room Temperature |
| 500 | 100 - 500 | Heating |
| 600 | 500 - 800 | High Temperature |
Electrical Resistivity of 4140 Round Bar
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 45.0 | 20 | Quenched and Tempered |
| 50.0 | 100 | |
| 55.0 | 200 | |
| 60.0 | 300 | |
| 65.0 | 400 | |
Equivalent of 4140 Round Bar
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| AISI | 1.7225 | G41400 |
| SAE | 4140 | G41400 |
Manufacturing Process & Heat Treatment of 4140 Round Bar
Annealing
Annealing of 4140 round bar involves heating the steel to a temperature range of 850-900°C, followed by a slow cooling process. This treatment helps to relieve internal stresses, enhance ductility, and improve machinability, making it easier to work with in subsequent manufacturing processes.
Forging
Forging of 4140 round bar is typically performed at temperatures between 1150-1250°C. The steel is shaped into desired forms through mechanical deformation, which refines the grain structure and enhances its mechanical properties. This process increases strength and toughness, making the forged product suitable for demanding applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 830-860 | Oil or Water | Increase hardness and strength |
| Tempering | 400-700 | Air | Reduce brittleness and achieve desired toughness |
| Quenching | Varies | Oil or Water | Rapid cooling to lock in hardness |
The heat treatment processes of hardening and tempering are crucial for enhancing the performance characteristics of 4140 round bar, ensuring it meets the required specifications for various industrial applications.
Various Types
4140 Round Bar - Standard
- Diameter: 1" to 12"
- Condition: Hot Rolled, Cold Drawn
- Applications: Automotive, Machinery Components
4140 Round Bar - Heat Treated
- Diameter: 0.75" to 8"
- Condition: Quenched and Tempered
- Applications: Heavy Equipment, Tooling
4140 Round Bar - Cold Drawn
- Diameter: 1" to 6"
- Condition: Cold Drawn
- Applications: Precision Parts, Aerospace
4140 Round Bar - Custom Sizes
- Diameter: Customizable
- Condition: Various
- Applications: Specialized Industries
Applications & Uses
- Oil & Gas Industry
- Petrochemical Plants
- Water Treatment Plants
- Pharmaceutical Industry
- Food & Beverage Industry
- Automobile Industry
Industries We Serve
Our alloys are widely used across:
- Steel Plants
- Foundries & Casting Units
- Automobile Industry
- Shipbuilding & Marine
- Oil & Gas
- Engineering Components
- Heavy Industrial Machinery
latest Price List of 4140 Round Bar
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| 4140 Round Bar | 3 mm | $2.50 – $3.00 | ₹207 – ₹248 |
| 4140 Round Bar | 6 mm | $2.40 – $2.90 | ₹199 – ₹241 |
| 4140 Round Bar | 10 mm | $2.30 – $2.80 | ₹192 – ₹232 |
Note: Prices are indicative and may vary based on size, quantity, raw material cost, and delivery location. Contact us for the latest quotation for 4140 Round Bar.
MOQ & Payment Terms
Minimum Order Quantity: 25–100 Kg depending on part size and grade.
Payment Terms: Depending On Grade and Quantity Size
Export Packaging & Shipping
- Seaworthy, fumigated wooden crates with waterproof inner lining
- Palletised packing with clear shipping marks and heat number identification
- Container stuffing supervision with loading photographs available on request
Cities We Suppllied In India
| Supply Cities | |||||
|---|---|---|---|---|---|
| Mumbai | Delhi | Pune | Chennai | Hyderabad | Bengaluru |
| Ahmedabad | Rajkot | Coimbatore | Kolkata | Bhopal | Surat |
We exported to 50+ countries worldwide.
| Exported Countries | |||||
|---|---|---|---|---|---|
| USA | UK | UAE | Germany | South Africa | Australia |
| Italy | Canada | Netherlands | Qatar | Saudi Arabia | Malaysia |
Our Certifications
We are a certified manufacturer and exporter, committed to strict quality control and international compliance standards.
Quality Inspection & Testing
At Super Metal Manufacturing Co., all products are checked through strict quality inspection and testing to meet international standards such as ASTM, ASME, EN, and DIN. This ensures consistent quality, accurate dimensions, and full material traceability.
- ✔ Chemical composition testing
- ✔ Mechanical tests such as tensile and hardness
- ✔ Dimensional inspection as per standard tolerances
- ✔ PMI, ultrasonic, and visual inspection (if required)
- ✔ EN 10204 3.1 / 3.2 test certificates
- ✔ Third-party inspection by SGS, TUV, BV, or Lloyd’s
Our quality systems support reliable supply for oil & gas, petrochemical, power, marine, and heavy engineering projects.
People Also Search For
- 1045 Steel Round Bar
- 4140 Steel Properties
- Alloy Steel Round Bar
- Heat Treatment of 4140 Steel
- 4140 Steel Applications
Frequently Asked Questions
About Super Metal Manufacturing Co.
Super Metal Manufacturing Co. is a trusted name in the metal industry since 1965, specializing in the manufacturing and export of high-quality 4140, EN19, and 42CrMo4 round bars. With decades of experience, we have built a strong reputation for delivering precision-engineered, durable, and high-performance steel products to industries worldwide.
Our company is committed to excellence through a robust quality management system and strict quality control at every stage of production. From sourcing premium raw materials from reputed suppliers like SAIL and JSW to final delivery, every product undergoes rigorous testing including tensile testing, bend and rebend tests, chemical analysis, and ultrasonic testing to ensure superior performance and reliability.
We are accredited with ISO 9001 certification and are TUV certified, reflecting our commitment to international quality standards. Our state-of-the-art manufacturing facilities, advanced machinery, and skilled workforce enable us to deliver customized solutions tailored to client requirements.
- ✔ 50+ years of industry experience in alloy steel and round bar manufacturing
- ✔ Specialized in 4140, EN19, and 42CrMo4 high-performance round bars
- ✔ ISO certified and TUV approved quality standards
- ✔ Strict quality testing including ultrasonic and chemical analysis
- ✔ Premium raw material sourcing from SAIL and JSW
- ✔ Advanced manufacturing infrastructure with modern machinery
- ✔ Custom-engineered solutions as per drawings and specifications
- ✔ Global export capability with reliable delivery
- ✔ Trusted by industries for critical and high-performance applications
Our Mission
Our mission is to deliver the highest-quality alloy steel round bars while maintaining excellence in precision, innovation, and customer satisfaction. We aim to empower industries worldwide by providing reliable and durable products that meet evolving manufacturing needs.
Our Vision
Our vision is to become a global leader in the manufacturing and export of premium-quality round bars, recognized for our product excellence, innovation, and commitment to exceeding customer expectations.