AISI 4340 Round Bar exporter
AISI 4340 Round Bar exporter plays a crucial role in supplying high-strength alloy steel bars that meet stringent industrial standards. Known for its excellent toughness, fatigue strength, and resistance to wear, this material is widely utilized across sectors requiring durable and reliable components. The exporter ensures that these round bars are manufactured and processed to precise specifications, catering to the demanding requirements of global markets.
The alloy composition of AISI 4340 includes nickel, chromium, and molybdenum, which collectively enhance its mechanical properties. Typically available in various diameters and lengths, these bars undergo heat treatment processes such as quenching and tempering to achieve optimal hardness and tensile strength. This versatility makes them ideal for critical applications, including aerospace components, automotive parts, and heavy machinery.
Industries often select these alloy steel bars for manufacturing gears, shafts, fasteners, and structural components that must withstand high stress and dynamic loads. The material's excellent machinability and weldability also facilitate customized fabrication, allowing manufacturers to produce complex designs without compromising quality. Exporters focus on delivering products that comply with international standards such as ASTM and SAE, ensuring compatibility with diverse industrial requirements.
Export readiness is a key aspect for suppliers dealing with AISI 4340 round bars. This includes proper certification, packaging that protects against corrosion during transit, and timely logistics management. The ability to provide traceability and documentation further enhances buyer confidence, particularly for industries where component reliability is paramount. By maintaining stringent quality control and efficient supply chain practices, exporters support seamless global distribution.
For industrial buyers seeking robust alloy steel solutions, sourcing from a reputable exporter guarantees access to premium-grade materials optimized for performance and durability. Whether for manufacturing critical machine parts or heavy-duty structural elements, these round bars offer a reliable foundation for engineering excellence across various sectors 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 4340 Round Bar exporter 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 exporter
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4340 Round Bar exporter
- 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 exporter
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 exporter
| 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 for enhanced load-bearing capacity
- ✔ Excellent fatigue resistance, ideal for heavy-duty applications
- ✔ Good machinability, facilitating easy fabrication and processing
- ✔ Suitable for heat treatment, providing versatility in hardness
- ✔ Superior impact toughness for improved durability
- ✔ Corrosion resistance properties enhanced by surface treatments
Technical Overview of AISI 4340 Round Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| AISI 4340 Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.40% Cr, 0.15-0.30% Mo | High-strength applications, aerospace components, automotive parts | ASTM A29, ASTM A322, SAE J403 |
| AISI 4340 Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.40% Cr, 0.15-0.30% Mo | High-strength applications, aerospace components, automotive parts | ASTM A29, ASTM A322, SAE J403 |
| AISI 4340 Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.40% Cr, 0.15-0.30% Mo | High-strength applications, aerospace components, automotive parts | ASTM A29, ASTM A322, SAE J403 |
Specifications Table
| Material | AISI 4340 |
|---|---|
| Grades | 4340 |
| Standard | ASTM A29 / A29M |
| Size Range | 1.0" to 12.0" Diameter |
| Length | Up to 20 feet |
| Form | Round Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4340 Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.30% Mo | Aerospace, automotive components, gears, and heavy machinery |
| AISI 4340 Annealed Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.30% Mo | Structural applications, fabrication, and tooling |
| AISI 4340 Cold Drawn Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.30% Mo | High-strength applications, automotive parts, and machinery |
| AISI 4340 Hot Rolled Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.30% Mo | General engineering and heavy-duty applications |
| AISI 4340 Quenched & Tempered Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.40-1.65% Ni, 0.20-0.30% Mo | High-stress applications, oil and gas drilling components |
Available Sizes of AISI 4340 Round Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 | 12 |
| 14 | 16 |
| 18 | 20 |
| 22 | 25 |
| 28 | 30 |
| 35 | 40 |
| 45 | 50 |
| 55 | 60 |
| 65 | 70 |
| 75 | 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 |
| Nickel (Ni) | 1.65 - 2.00 |
| Chromium (Cr) | 0.70 - 0.90 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Mechanical Properties of AISI 4340
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 1080 - 1200 |
| Yield Strength (MPa) | 930 - 1030 |
| Elongation (%) | 12 - 15 |
| Hardness (HB) | 248 - 300 |
| Modulus of Elasticity (GPa) | 210 |
AISI 4340 – Physical & Thermal Properties
Density of AISI 4340
| Property | Metric | Imperial |
|---|---|---|
| Density | 7,850 kg/m³ | 490 lb/ft³ |
Melting Point of AISI 4340
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1,400 - 1,450 °C | 2,552 - 2,642 °F |
Specific Heat of AISI 4340
| Specific Heat of AISI 4340 | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Room Temperature |
| 430 | 100 - 400 | Heat Treated |
| 390 | 400 - 900 | Annealed |
Electrical Resistivity of AISI 4340
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 75 | 20 | Annealed |
| 78 | 100 | |
| 80 | 200 | |
| 82 | 300 | |
| 85 | 400 | |
Equivalent of AISI 4340 Round Bar
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A29 | 34CrNiMo6 | G43400 |
| EN 10083-3 | 42CrMo4 | 1.7225 |
Manufacturing Process & Heat Treatment of AISI 4340
Annealing
The annealing process for AISI 4340 involves heating the steel to a temperature range of 800-900°C and holding it at this temperature for a specified time to allow for uniform temperature distribution. This is followed by slow cooling in a furnace. The purpose of annealing is to relieve internal stresses, improve ductility, and refine the microstructure, making the steel easier to machine.
Forging
Forging of AISI 4340 is typically performed at elevated temperatures, around 1100-1250°C, to enhance its malleability. The process involves shaping the steel through compressive forces, which improves the grain structure and mechanical properties. Forged AISI 4340 exhibits superior strength and toughness compared to its cast counterparts, making it ideal for high-stress applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 850-880 | Oil or Water | To increase hardness and strength |
| Tempering | 400-650 | Air | To reduce brittleness and improve toughness |
| Stress Relieving | 600-650 | Air | To relieve residual stresses from machining |
The combination of forging, hardening, and tempering processes ensures that AISI 4340 round bars possess the desired mechanical properties suitable for demanding applications in various industries.
Various Types
AISI 4340 Round Bar - Standard
- Diameter: 10mm to 300mm
- Condition: Hot Rolled, Annealed
- Applications: Automotive, Aerospace, Machinery Components
AISI 4340 Round Bar - Alloyed
- Diameter: 20mm to 250mm
- Condition: Quenched and Tempered
- Applications: Heavy Load Applications, Oil and Gas Industry
AISI 4340 Round Bar - High Tensile
- Diameter: 15mm to 200mm
- Condition: Cold Drawn, Heat Treated
- Applications: Structural Components, Aircraft Parts
AISI 4340 Round Bar - Customized
- Diameter: Custom Sizes Available
- Condition: Specific Heat Treatment as per Requirement
- Applications: Specialized Engineering Applications
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 | $5.00 – $5.50 | ₹410 – ₹450 |
| AISI 4340 | 6 mm | $4.80 – $5.30 | ₹395 – ₹440 |
| AISI 4340 | 10 mm | $4.60 – $5.10 | ₹380 – ₹430 |
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
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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.