AISI 4340 Forged Black Flat Bar exporter
AISI 4340 Forged Black Flat Bar exporter specializes in supplying high-strength alloy steel bars that are forged to exacting standards for enhanced mechanical properties. These flat bars are made from AISI 4340 steel, a nickel-chromium-molybdenum alloy known for its excellent toughness, fatigue strength, and wear resistance. The black finish indicates a protective oxide layer that helps resist corrosion and surface damage during handling and transportation.
Manufactured through a precise forging process, these flat bars exhibit superior grain structure and uniformity compared to rolled or cast alternatives. The dimensions are maintained within tight tolerances, ensuring consistent thickness and flatness, which are critical for industrial applications requiring precision. Typical sizes range from small gauge thicknesses suitable for light structural components to heavier sections used in demanding mechanical assemblies.
Due to their outstanding mechanical properties, these alloy steel bars find extensive use in aerospace, automotive, heavy machinery, and defense sectors. Their high tensile strength and toughness make them ideal for manufacturing shafts, gears, aircraft landing gear components, and high-stress machine parts. The combination of strength and ductility ensures reliability under cyclic loads and harsh operating environments.
Export readiness is a key feature offered by suppliers, with stringent quality control measures in place including chemical composition verification, mechanical testing, and certification according to international standards such as ASTM A29/A29M. Packaging is designed to withstand long-distance shipping and protect the bars from damage and corrosion. Logistics partners ensure timely delivery to global industrial hubs, supporting seamless integration into manufacturing supply chains.
Industrial buyers seeking durable, high-performance alloy steel flat bars will find these forged products an excellent choice for demanding applications. The blend of advanced metallurgy, precise forging, and export expertise positions these bars as reliable components in critical engineering projects 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 Forged Black Flat 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 Forged Black Flat Bar exporter
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4340 Forged Black Flat 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 Forged Black Flat 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 Forged Black Flat 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 Forged Black Flat Bar
- ✔ High tensile strength, making it ideal for high-stress applications
- ✔ Excellent toughness and fatigue resistance
- ✔ Good weldability and machinability for ease of fabrication
- ✔ Availability in various dimensions and thicknesses
- ✔ Suitable for heat treatment to enhance mechanical properties
- ✔ Corrosion-resistant surface finish provided by forging process
Technical Overview of AISI 4340 Forged Black Flat Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| AISI 4340 Forged Black Flat 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% | Used in high-strength applications such as aerospace components, heavy-duty machinery, and automotive parts. | ASTM A829, SAE J403 |
| AISI 4340 Forged Black Flat 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% | Suitable for applications requiring high toughness and fatigue strength. | AMS 6415, MIL-S-5000 |
| AISI 4340 Forged Black Flat 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% | Commonly used in the manufacture of gears, shafts, and heavy load-bearing structures. | ASTM A36, ASME SA-36 |
Specifications Table
| Material | AISI 4340 |
|---|---|
| Grades | 4340, 4340M |
| Standard | ASTM A829 |
| Size Range | 1 inch to 12 inches wide |
| Length | Up to 20 feet |
| Form | Forged Flat Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4340 Forged Black Flat 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%) | Used in aircraft and aerospace applications, automotive components, and machinery requiring high strength and toughness. |
| AISI 4340 Quenched and Tempered Flat 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%) | Ideal for high-stress applications, including gears, shafts, and heavy machinery. |
| AISI 4340 Normalized Flat 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%) | Commonly used in structural applications and components that require improved toughness. |
| AISI 4340 Cold Drawn Flat 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%) | Suitable for precision machining and high-performance applications requiring tight tolerances. |
| AISI 4340 Hot Rolled Flat 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%) | Typically used in construction and fabrication where high strength is needed. |
Available Sizes of AISI 4340 Forged Black Flat Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 20 x 5 | 50 x 10 |
| 25 x 6 | 55 x 12 |
| 30 x 8 | 60 x 15 |
| 35 x 8 | 70 x 20 |
| 40 x 10 | 80 x 25 |
| 45 x 12 | 90 x 30 |
| 50 x 15 | 100 x 30 |
| 60 x 20 | 120 x 40 |
| 70 x 25 | 150 x 50 |
| 80 x 30 | 200 x 60 |
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) | 0.04 max |
| Sulfur (S) | 0.04 max |
Mechanical Properties of AISI 4340 Forged Black Flat Bar
| Property | Value |
|---|---|
| Tensile Strength | 930 MPa (135,000 psi) |
| Yield Strength | 760 MPa (110,000 psi) |
| Elongation | 15% in 50 mm |
| Hardness (Rockwell C) | 28 - 34 HRC |
| Modulus of Elasticity | 210 GPa (30,000,000 psi) |
AISI 4340 Forged Black Flat Bar – Physical & Thermal Properties
Density of AISI 4340 Forged Black Flat Bar
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
Melting Point of AISI 4340 Forged Black Flat Bar
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1425 - 1540 °C | 2600 - 2800 °F |
Specific Heat of AISI 4340 Forged Black Flat Bar
| Specific Heat of AISI 4340 Forged Black Flat Bar | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Room Temperature |
| 600 | 100 - 400 | Heating |
| 700 | 400 - 900 | High Temperature |
Electrical Resistivity of AISI 4340 Forged Black Flat Bar
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 75 | 20 | Annealed |
| 80 | 100 | |
| 85 | 200 | |
| 90 | 300 | |
| 95 | 400 | |
Equivalent of AISI 4340 Forged Black Flat Bar
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| EN 10083-3 | 34CrNiMo6 | G43400 |
| ASTM A829 | 4340 | G43400 |
Manufacturing Process & Heat Treatment of AISI 4340 Forged Black Flat Bar
Annealing
The annealing process for AISI 4340 involves heating the material to a temperature range of 800-850°C, followed by a slow cooling process. This treatment reduces hardness, relieves internal stresses, and improves ductility, making the steel easier to machine and work with.
Forging
Forging of AISI 4340 is performed at elevated temperatures, typically between 1100-1200°C. The material is shaped through mechanical deformation, enhancing its strength and toughness due to the refined grain structure achieved during the process.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 850-880 | Oil | To increase hardness and strength by forming martensite. |
| Tempering | 400-600 | Air | To reduce brittleness and achieve desired mechanical properties. |
| Stress Relieving | 600-650 | Air | To relieve residual stresses and improve dimensional stability. |
The combination of these processes ensures that AISI 4340 forged black flat bars possess optimal mechanical properties, making them suitable for various industrial applications, including automotive and aerospace sectors.
Various Types
AISI 4340 Forged Black Flat Bar - Standard
- Dimensions: 50mm x 10mm to 200mm x 50mm
- Condition: Hot Rolled
- Applications: Aerospace components, automotive parts, machinery
AISI 4340 Forged Black Flat Bar - High Strength
- Dimensions: 25mm x 5mm to 150mm x 30mm
- Condition: Quenched and Tempered
- Applications: Heavy machinery, structural components, tool making
AISI 4340 Forged Black Flat Bar - Custom Sizes
- Dimensions: Customizable upon request
- Condition: Annealed
- Applications: Specialized industrial applications, custom fabrication
AISI 4340 Forged Black Flat Bar - Low Alloy
- Dimensions: 10mm x 3mm to 100mm x 20mm
- Condition: Cold Drawn
- Applications: Manufacturing of gears, bolts, and other 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 4340 Forged Black Flat Bar
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| AISI 4340 | 3 mm | $3.50 – $4.00 | ₹290 – ₹320 |
| AISI 4340 | 6 mm | $3.30 – $3.80 | ₹270 – ₹310 |
| AISI 4340 | 10 mm | $3.10 – $3.60 | ₹250 – ₹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 Forged Black Flat 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 4340 Steel Properties
- AISI 4340 Forged Round Bar Supplier
- AISI 4140 Forged Black Flat Bar Exporter
- AISI 4340 Heat Treatment Process
- AISI 4340 Forged 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.