AISI 4340 Round Bar Manufacturer
AISI 4340 Round Bar Manufacturer plays a pivotal role in supplying high-strength alloy steel bars widely used across demanding industrial sectors. Known for its exceptional toughness, fatigue resistance, and hardenability, this grade of steel is an optimal choice for components requiring superior mechanical properties. The round bars are precision-engineered, meeting stringent quality standards that ensure consistent performance in critical applications.
The material composition of 4340 steel includes nickel, chromium, and molybdenum, which contribute to its excellent strength-to-weight ratio and resistance to wear and corrosion. These bars are typically available in various diameters and lengths, tailored to meet specific engineering requirements. Heat treatment processes such as quenching and tempering further enhance their mechanical attributes, making them suitable for manufacturing gears, shafts, and aircraft landing gear components.
Manufacturers supplying these alloy steel bars emphasize adherence to international standards like ASTM A29 and AMS 6349, ensuring compatibility with global industrial specifications. This compliance facilitates seamless integration into diverse manufacturing workflows, from automotive to aerospace sectors. Additionally, dimensional accuracy and surface finish are maintained through advanced machining and finishing techniques, guaranteeing optimal fit and function.
Given the global demand for high-grade alloy steel bars, suppliers are equipped for export readiness, offering comprehensive certification and traceability documentation. Packaging is designed to protect the integrity of the product during transit, catering to international logistics requirements. This export capability ensures timely delivery and reliable supply chains for industrial buyers worldwide.
In summary, sourcing from a reputable manufacturer of these alloy steel round bars ensures access to robust, versatile materials that support high-performance engineering solutions. Whether for heavy machinery, defense, or aerospace applications, the combination of material excellence and manufacturing precision makes these bars a critical asset in industrial production.
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 4340 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 4340 Round Bar Manufacturer
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4340 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 4340 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 4340 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 4340 Round Bar
- ✔ High tensile strength, making it ideal for heavy-duty applications
- ✔ Excellent toughness and fatigue resistance, ensuring durability
- ✔ Suitable for heat treatment processes, enhancing mechanical properties
- ✔ Good machinability, allowing for precise shaping and finishing
- ✔ Versatile usability in various industries, including aerospace and automotive
- ✔ Corrosion resistance when properly treated, extending service life
Technical Overview of AISI 4340 Round Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| AISI 4340 Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Si: 0.15-0.40%, Cr: 0.70-0.90%, Ni: 1.65-2.00%, Mo: 0.20-0.30% | Used in high-strength applications such as gears, shafts, and aircraft components | ASTM A829, SAE J403, AMS 6415 |
| AISI 4340 Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Si: 0.15-0.40%, Cr: 0.70-0.90%, Ni: 1.65-2.00%, Mo: 0.20-0.30% | Commonly used in automotive and machinery applications requiring toughness and fatigue resistance | ASTM A829, SAE J403, AMS 6415 |
| AISI 4340 Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Si: 0.15-0.40%, Cr: 0.70-0.90%, Ni: 1.65-2.00%, Mo: 0.20-0.30% | Ideal for use in heavy-duty machinery and structural components | ASTM A829, SAE J403, AMS 6415 |
Specifications Table
| Material | AISI 4340 |
|---|---|
| Grades | 4340 |
| Standard | ASTM A829 |
| Size Range | 0.5" to 12" Diameter |
| Length | Up to 20 Feet |
| Form | Round Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4340 Round Bar | Carbon (0.38-0.43%), Manganese (0.60-0.90%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | High strength applications, aerospace components, automotive parts, gear manufacturing |
| AISI 4340 Normalized Round Bar | Carbon (0.38-0.43%), Manganese (0.60-0.90%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | Structural components, heavy machinery, high-stress applications |
| AISI 4340 Heat Treated Round Bar | Carbon (0.38-0.43%), Manganese (0.60-0.90%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | High-performance applications, oil and gas industry, aircraft landing gear |
| AISI 4340 Quenched and Tempered Round Bar | Carbon (0.38-0.43%), Manganese (0.60-0.90%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | High-tensile applications, power transmission components, military applications |
| AISI 4340 Cold Drawn Round Bar | Carbon (0.38-0.43%), Manganese (0.60-0.90%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | Precision machining, automotive parts, tool manufacturing |
Available Sizes of AISI 4340 Round Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 | 25 |
| 12 | 30 |
| 16 | 35 |
| 20 | 40 |
| 22 | 45 |
| 24 | 50 |
| 28 | 55 |
| 32 | 60 |
| 36 | 70 |
| 40 | 80 |
Chemical Properties of AISI 4340
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Manganese (Mn) | 0.60 - 0.90 |
| Silicon (Si) | 0.15 - 0.40 |
| Chromium (Cr) | 0.70 - 0.90 |
| Nickel (Ni) | 1.65 - 2.00 |
| Molybdenum (Mo) | 0.20 - 0.30 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.040 max |
Mechanical Properties of AISI 4340
| Property | Value |
|---|---|
| Tensile Strength (Ultimate) | 1900 MPa |
| Tensile Strength (Yield) | 1080 MPa |
| Elongation | 15% |
| Reduction of Area | 50% |
| Hardness (Brinell) | 330 HB |
AISI 4340 Round Bar – Physical & Thermal Properties
Density of AISI 4340 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
Melting Point of AISI 4340 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1425 - 1540 °C | 2600 - 2800 °F |
Specific Heat of AISI 4340 Round Bar
| Specific Heat of AISI 4340 Round Bar | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Annealed |
| 460 | 100 - 300 | Quenched |
| 420 | 300 - 600 | Tempered |
Electrical Resistivity of AISI 4340 Round Bar
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 74 | 20 | As-quenched |
| 78 | 100 | |
| 82 | 200 | |
| 86 | 300 | |
| 90 | 400 | |
Equivalent of AISI 4340
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A29 | 1.6582 | G43400 |
| DIN 36NiCrMo4 | 1.6511 | G43400 |
Manufacturing Process & Heat Treatment of AISI 4340
Annealing
The annealing process for AISI 4340 involves heating the steel to a temperature range of 850°C to 900°C, followed by slow cooling. This process is designed to relieve internal stresses, enhance ductility, and improve machinability. The controlled cooling helps to refine the microstructure, ensuring a more uniform and stable material for subsequent processing.
Forging
Forging of AISI 4340 is performed at elevated temperatures, typically between 1100°C and 1200°C. This process involves shaping the steel using compressive forces, which improves its mechanical properties through work hardening and grain refinement. The forged product exhibits enhanced strength and toughness, making it suitable for high-stress applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 830 - 860 | Oil | Increase hardness and strength |
| Tempering | 400 - 650 | Air | Reduce brittleness and relieve stresses |
| Final Tempering | 300 - 400 | Air | Achieve desired mechanical properties |
The comprehensive manufacturing and heat treatment processes for AISI 4340 ensure that the final product meets the stringent requirements for high-performance applications, delivering exceptional strength, toughness, and wear resistance.
Various Types
AISI 4340 Round Bar - Standard
- Diameter: 10 mm to 300 mm
- Condition: Hot Rolled, Cold Drawn
- Applications: Aerospace, Automotive, Machinery
AISI 4340 Round Bar - Annealed
- Diameter: 20 mm to 250 mm
- Condition: Annealed
- Applications: High-stress components, Gears
AISI 4340 Round Bar - Quenched & Tempered
- Diameter: 15 mm to 200 mm
- Condition: Quenched and Tempered
- Applications: Heavy-duty machinery, Structural components
AISI 4340 Round Bar - Custom Sizes
- Diameter: Customizable upon request
- Condition: Varies
- Applications: Specialized applications, Custom engineering projects
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 4340 Round Bar
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| AISI 4340 | 3 mm | $3.50 – $4.00 | ₹290 – ₹320 |
| AISI 4340 | 6 mm | $3.40 – $3.90 | ₹280 – ₹310 |
| AISI 4340 | 10 mm | $3.30 – $3.80 | ₹270 – ₹300 |
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 4340 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 Round Bar Manufacturer
- AISI 8620 Round Bar Supplier
- AISI 4340 Steel Properties
- AISI 4340 Round Bar Price
- AISI 4340 Heat Treatment Process
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.