AISI 4340 Round Bar Round Bar in South Africa
AISI 4340 Round Bar Round Bar in South Africa is a high-strength alloy steel product widely used in demanding engineering applications. Known for its excellent toughness, fatigue resistance, and hardenability, this material is ideal for manufacturing components that require superior mechanical properties. The round bar form facilitates easy machining and forging, making it a versatile choice for various industrial sectors.
This nickel-chromium-molybdenum alloy steel is commonly supplied in precision-ground or hot-rolled conditions, offering a range of diameters and lengths to suit different project requirements. Its chemical composition ensures outstanding strength and durability, making it suitable for critical applications such as aerospace, automotive, heavy machinery, and oil and gas industries. The steel's ability to maintain structural integrity under high stress and impact conditions is a key factor in its popularity among engineers and fabricators.
Manufacturers and suppliers in South Africa provide these bars with certifications that comply with international standards such as ASTM and SAE, ensuring quality and consistency. Heat treatment processes, including quenching and tempering, are often applied to optimize the mechanical properties of the alloy, tailoring it for specific industrial needs. This adaptability makes it a reliable choice for producing shafts, gears, fasteners, and other mechanical components requiring high-performance steel.
With South Africa's strategic location and established logistics infrastructure, exporting AISI 4340 alloy steel round bars to global markets is efficient and reliable. Exporters often provide comprehensive documentation and traceability, enhancing buyer confidence and meeting stringent import regulations. This readiness supports industries worldwide, from manufacturing hubs to maintenance and repair operations, ensuring timely delivery and consistent supply.
For industrial buyers seeking a robust and versatile steel solution, the availability of AISI 4340 round bars in South Africa presents an excellent opportunity. The combination of advanced metallurgical properties, customizable dimensions, and international export capabilities makes this product a valuable asset for projects demanding high strength and reliability.
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 Round Bar in South Africa 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 Round Bar in South Africa
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4340 Round Bar Round Bar in South Africa
- 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 Round Bar in South Africa
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 Round Bar in South Africa
| 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 toughness and resistance to impact
- ✔ Superior hardening properties for improved durability
- ✔ Good machinability for ease of processing
- ✔ Versatile applications in automotive and aerospace industries
- ✔ High fatigue strength for long-lasting performance
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, 1.50-1.80% Ni, 0.20-0.30% Cr, 0.05-0.15% Mo | High strength applications, aerospace components, automotive parts | AISI, ASTM, SAE |
| AISI 4340 Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.50-1.80% Ni, 0.20-0.30% Cr, 0.05-0.15% Mo | Machining and manufacturing of gears, shafts, and axles | AISI, ASTM, SAE |
| AISI 4340 Round Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.50-1.80% Ni, 0.20-0.30% Cr, 0.05-0.15% Mo | Construction of heavy machinery and tools | AISI, ASTM, SAE |
Specifications Table
| Material | AISI 4340 |
|---|---|
| Grades | 4340 |
| Standard | ASTM A331, AMS 6349 |
| Size Range | 20 mm to 300 mm diameter |
| Length | Up to 6 meters |
| Form | Round Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4340 Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Ni: 1.65-2.00%, Cr: 0.70-0.90%, Mo: 0.15-0.25% | High strength components, gears, and heavy machinery parts |
| AISI 4340QT Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Ni: 1.65-2.00%, Cr: 0.70-0.90%, Mo: 0.15-0.25% | High toughness applications, aerospace and automotive components |
| AISI 4340V Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Ni: 1.65-2.00%, Cr: 0.70-0.90%, Mo: 0.15-0.25%, V: 0.05-0.15% | Heavy-duty machinery, crankshafts, and gear applications |
| AISI 4340HD Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Ni: 1.65-2.00%, Cr: 0.70-0.90%, Mo: 0.15-0.25% | Applications requiring high strength and fatigue resistance |
| AISI 4340X Round Bar | C: 0.38-0.43%, Mn: 0.60-0.90%, Ni: 1.65-2.00%, Cr: 0.70-0.90%, Mo: 0.15-0.25% | Parts subjected to dynamic loading, such as axles and shafts |
Available Sizes of AISI 4340 Round Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 20 | 25 |
| 30 | 35 |
| 40 | 45 |
| 50 | 55 |
| 60 | 65 |
| 70 | 75 |
| 80 | 85 |
| 90 | 95 |
| 100 | 110 |
| 120 | 130 |
Chemical Properties of AISI 4340 Round Bar
| 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 Round Bar
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 850 - 1080 |
| Yield Strength (MPa) | 650 - 850 |
| Elongation (%) | 15 - 20 |
| Reduction of Area (%) | 50 |
| Hardness (HB) | 248 - 285 |
AISI 4340 Round Bar – Physical & Thermal Properties
Density of AISI 4340 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Density | 7,850 kg/m³ | 490 lb/ft³ |
Melting Point of AISI 4340 Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1,350 - 1,400 °C | 2,462 - 2,552 °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 | Room Temperature |
| 480 | 100 - 300 | Medium Temperature |
| 460 | 300 - 600 | High Temperature |
Electrical Resistivity of AISI 4340 Round Bar
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 75 | 20 | Normalized |
| 80 | 100 | |
| 85 | 200 | |
| 90 | 300 | |
| 95 | 400 | |
Equivalent of AISI 4340 Round Bar
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| SANS 1431 | 34CrNiMo6 | G43400 |
| ASTM A829 | 4340 | G43400 |
Manufacturing Process & Heat Treatment of AISI 4340 Round Bar
Annealing
The annealing process for AISI 4340 round bars involves heating the material to a temperature of approximately 850-900°C, followed by a slow cooling process. This treatment helps to relieve internal stresses, improve machinability, and achieve a uniform microstructure. The slow cooling is typically done in a furnace to ensure controlled temperature reduction.
Forging
Forging of AISI 4340 round bars is typically performed at temperatures ranging from 950°C to 1200°C. The hot working process enhances the mechanical properties of the steel by refining its grain structure. This results in improved strength and toughness, making the forged bars suitable for high-stress applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 830-870 | Oil or Water | To increase hardness and strength by transforming the microstructure to martensite. |
| Tempering | 400-600 | Air | To reduce brittleness and relieve stresses while maintaining a good balance of hardness and toughness. |
| Final Heat Treatment | 150-200 | Air | To achieve desired mechanical properties and stabilize dimensions after machining. |
The manufacturing and heat treatment processes of AISI 4340 round bars are crucial in achieving the desired mechanical properties for various industrial applications. Proper adherence to these processes ensures optimal performance and reliability in service.
Various Types
AISI 4340 Round Bar - Standard
- Diameter: 25mm to 300mm
- Condition: Hot Rolled, Annealed
- Applications: Aerospace, Automotive, Heavy Machinery
AISI 4340 Round Bar - Premium
- Diameter: 20mm to 250mm
- Condition: Quenched and Tempered
- Applications: Oil & Gas, Military, Structural Components
AISI 4340 Round Bar - Custom
- Diameter: Custom Sizes Available
- Condition: Cold Drawn, Hot Rolled
- Applications: Specialized Manufacturing, Tooling
AISI 4340 Round Bar - High Strength
- Diameter: 30mm to 200mm
- Condition: Normalized, Tempered
- Applications: High Load Applications, Aerospace Components
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 Round Bar | 3 mm | $5.00 – $5.50 | ₹415 – ₹456 |
| AISI 4340 Round Bar | 6 mm | $4.80 – $5.30 | ₹399 – ₹439 |
| AISI 4340 Round Bar | 10 mm | $4.60 – $5.10 | ₹385 – ₹425 |
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 in South Africa
- AISI 1045 Steel Round Bar Suppliers
- Alloy Steel Round Bar Prices in South Africa
- SAE 8620 Round Bar Manufacturers
- High Strength Steel Round Bar Specifications
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.