AISI 4140 Round Bar Manufacturer
AISI 4140 Round Bar Manufacturer plays a crucial role in supplying high-quality alloy steel bars known for their exceptional strength, toughness, and wear resistance. This chromium-molybdenum steel grade is widely used in industries requiring materials that withstand heavy mechanical stress and fatigue. Typically supplied in various diameters and lengths, these bars are precision-engineered to meet stringent dimensional tolerances and surface finish standards, making them ideal for critical engineering applications.
The product type, characterized by its medium carbon content and hardenability, offers excellent machinability and heat treatment capabilities. The bars are often quenched and tempered to enhance mechanical properties such as tensile strength, yield strength, and impact resistance. These attributes make the material suitable for manufacturing shafts, gears, bolts, and other components subjected to high loads and harsh operating conditions.
In terms of industrial applications, the alloy steel bars are extensively utilized in automotive, aerospace, oil and gas, and heavy machinery sectors. Their ability to maintain structural integrity under dynamic stress and corrosive environments ensures durability and long service life. Customizable surface treatments and certifications further enhance their suitability for specific client requirements, including compliance with international quality standards.
Export readiness is a key consideration for suppliers, ensuring that the steel bars are packaged and certified according to global shipping and trade regulations. Documentation such as mill test reports, material certificates, and compliance with ASTM or equivalent standards facilitate smooth international transactions. Reliable logistics and timely delivery contribute to maintaining supply chain efficiency for industrial buyers worldwide.
Our Approvals | Third Party Inspection
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why AISI 4140 Round Bar Manufacturer 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 AISI 4140 Round Bar Manufacturer
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4140 Round Bar Manufacturer
- 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 AISI 4140 Round Bar Manufacturer
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 AISI 4140 Round Bar Manufacturer
| 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 AISI 4140 Round Bar
- ✔ High tensile strength for demanding applications
- ✔ Excellent toughness and wear resistance
- ✔ Versatile for heat treatment and hardening processes
- ✔ Good machinability for precise fabrication
- ✔ Available in various sizes and specifications
- ✔ Customizable to meet specific industry requirements
Technical Overview of AISI 4140 Round Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| AISI 4140 Round Bar | 0.38-0.43% Carbon, 0.75-1.00% Manganese, 0.15-0.25% Silicon, 0.80-1.10% Chromium, 0.15-0.30% Molybdenum | Used in heavy-duty applications such as gears, axles, and shafts due to its high strength and toughness | AISI, ASTM A829 |
| AISI 4140 Round Bar | 0.38-0.43% Carbon, 0.75-1.00% Manganese, 0.15-0.25% Silicon, 0.80-1.10% Chromium, 0.15-0.30% Molybdenum | Ideal for applications requiring wear resistance and fatigue strength | SAE J403, ASTM A572 |
| AISI 4140 Round Bar | 0.38-0.43% Carbon, 0.75-1.00% Manganese, 0.15-0.25% Silicon, 0.80-1.10% Chromium, 0.15-0.30% Molybdenum | Commonly used in the oil and gas industry for downhole components | API 6A, API 7K |
Specifications Table
| Material | AISI 4140 |
|---|---|
| Grades | 4140, 4140HT |
| Standard | ASTM A829, AMS 6349 |
| Size Range | 1.0" to 8.0" diameter |
| Length | Up to 20 feet |
| Form | Round Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4140 Round Bar | Carbon 0.38-0.43%, Manganese 0.75-1.00%, Chromium 0.80-1.10%, Molybdenum 0.15-0.25% | Used in the manufacture of heavy-duty machinery, automotive components, and tools requiring high strength and toughness. |
| AISI 4140 HT Round Bar | Carbon 0.38-0.43%, Manganese 0.75-1.00%, Chromium 0.80-1.10%, Molybdenum 0.15-0.25% | Ideal for applications that require additional hardness and strength, such as gears, crankshafts, and axles. |
| AISI 4140 Prehard Round Bar | Carbon 0.38-0.43%, Manganese 0.75-1.00%, Chromium 0.80-1.10%, Molybdenum 0.15-0.25% | Commonly used in the manufacturing of high-strength components that require minimal machining after heat treatment. |
| AISI 4140 Annealed Round Bar | Carbon 0.38-0.43%, Manganese 0.75-1.00%, Chromium 0.80-1.10%, Molybdenum 0.15-0.25% | Suitable for parts that will undergo additional shaping or machining, offering excellent workability. |
| AISI 4140 Q&T Round Bar | Carbon 0.38-0.43%, Manganese 0.75-1.00%, Chromium 0.80-1.10%, Molybdenum 0.15-0.25% | Used in applications demanding a combination of high strength and toughness after quenching and tempering processes. |
Available Sizes of AISI 4140 Round Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 | 12 |
| 14 | 16 |
| 18 | 20 |
| 22 | 25 |
| 28 | 30 |
| 32 | 35 |
| 38 | 40 |
| 45 | 50 |
| 55 | 60 |
| 70 | 80 |
Chemical Properties of AISI 4140
| 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 |
| Phosphorus (P) | max 0.04 |
| Sulfur (S) | max 0.04 |
| Iron (Fe) | Balance |
Mechanical Properties of AISI 4140
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 655 - 850 |
| Yield Strength (MPa) | 415 - 620 |
| Elongation (%) | 18 - 22 |
| Reduction of Area (%) | 50 |
| Hardness (HB) | 207 - 248 |
AISI 4140 Round Bar – Physical & Thermal Properties
Density of AISI 4140 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
Melting Point of AISI 4140 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1425 - 1540 °C | 2600 - 2800 °F |
Specific Heat of AISI 4140 Round Bar
| Specific Heat of AISI 4140 Round Bar | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 480 | 20 - 100 | Annealed |
| 500 | 100 - 500 | Quenched |
| 520 | 500 - 800 | Tempered |
Electrical Resistivity of AISI 4140
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 60 | 20 | Quenched and Tempered |
| 62 | 100 | |
| 64 | 200 | |
| 66 | 300 | |
| 68 | 400 | |
Equivalent of AISI 4140
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A829 | 42CrMo4 | G41400 |
| EN 10083-3 | 42CrMo4 | 1.7225 |
Manufacturing Process & Heat Treatment of AISI 4140
Annealing
The annealing process for AISI 4140 involves heating the steel to a temperature range of approximately 800°C to 900°C and maintaining it at this temperature for a sufficient period to allow for uniform heating. This is followed by slow cooling in the furnace or in still air. The purpose of annealing is to relieve internal stresses, improve ductility, and refine the grain structure of the steel.
Forging
Forging of AISI 4140 is typically performed at temperatures between 1100°C and 1250°C. The steel is heated to the desired temperature and then shaped using mechanical or hydraulic presses or hammers. Forging improves the mechanical properties of the steel by aligning the grain structure and enhancing its strength and toughness.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 850 - 880 | Oil | To increase hardness and strength |
| Tempering | 400 - 700 | Air | To reduce brittleness and improve toughness |
| Stress Relieving | 500 - 600 | Air | To relieve residual stresses after hardening |
The combination of these processes ensures that AISI 4140 round bars achieve the desired mechanical properties, making them suitable for a wide range of industrial applications, including automotive and machinery components.
Various Types
AISI 4140 Round Bar - Standard
- Diameter: 20mm - 500mm
- Condition: Hot Rolled / Cold Drawn
- Applications: Automotive, Machinery Components
AISI 4140 Round Bar - Annealed
- Diameter: 25mm - 300mm
- Condition: Annealed
- Applications: Oil & Gas, Aerospace
AISI 4140 Round Bar - Quenched & Tempered
- Diameter: 10mm - 150mm
- Condition: Quenched & Tempered
- Applications: Heavy Machinery, Tooling
AISI 4140 Round Bar - Forged
- Diameter: 35mm - 400mm
- Condition: Forged
- Applications: Structural Components, Fasteners
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 AISI 4140 Round Bar
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| AISI 4140 | 3 mm | $2.50 – $3.00 | ₹207 – ₹248 |
| AISI 4140 | 6 mm | $2.40 – $2.90 | ₹199 – ₹241 |
| AISI 4140 | 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 AISI 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
- AISI 4140 Steel Properties
- AISI 4140 Round Bar Suppliers
- AISI 4140 Heat Treatment Process
- AISI 4140 vs AISI 4130
- AISI 4140 Round Bar Price
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.