AISI 4340 Forged Black Flat Bar Manufacturer
AISI 4340 Forged Black Flat Bar Manufacturer specializes in delivering high-strength alloy steel bars known for their exceptional toughness and fatigue resistance. These flat bars are forged to precise dimensions, ensuring superior mechanical properties and dimensional stability. The black finish not only provides corrosion resistance but also enhances the surface hardness, making the product ideal for demanding industrial applications.
Crafted from AISI 4340 steel, the flat bars exhibit excellent tensile strength, impact toughness, and wear resistance, attributes that stem from their nickel, chromium, and molybdenum alloying elements. Typical specifications include a tensile strength range of 95-108 ksi and yield strength around 70-85 ksi, with hardness levels that can be further enhanced through heat treatment. These characteristics make the bars suitable for components requiring high stress endurance, such as gears, shafts, and heavy-duty machinery parts.
The versatility of forged flat bars extends to various industries, including automotive, aerospace, construction, and heavy engineering. Their robust nature supports applications like structural frameworks, tool manufacturing, and equipment fabrication where durability and reliability are paramount. The black oxide coating also aids in reducing friction and preventing surface degradation during handling and machining processes.
Manufacturers offering these alloy steel products maintain rigorous quality control standards, ensuring compliance with international norms such as ASTM A29 and AMS 6345. This adherence guarantees that each batch meets stringent mechanical and chemical composition requirements. Export-ready packaging and documentation facilitate seamless global distribution, catering to industrial buyers worldwide seeking consistent quality and timely delivery.
With a focus on customization, suppliers can provide flat bars in various sizes and thicknesses to match specific project requirements. Their commitment to innovation and customer service positions them as trusted partners in the supply chain, enabling industries to optimize performance and extend the lifespan of critical components. Whether for prototype development or large-scale production, these forged alloy bars remain a reliable choice for demanding engineering solutions.
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 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 Forged Black Flat Bar Manufacturer
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4340 Forged Black Flat 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 Forged Black Flat 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 Forged Black Flat 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 Forged Black Flat Bar
- ✔ High tensile strength suitable for heavy-duty applications
- ✔ Excellent toughness and ductility for enhanced durability
- ✔ Superior fatigue resistance under cyclic loading conditions
- ✔ Versatile for various manufacturing processes including machining and welding
- ✔ Heat treatable for customized mechanical properties
- ✔ Corrosion-resistant surface finish available upon request
Technical Overview of AISI 4340 Forged Black Flat Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| AISI 4340 Forged Black Flat Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.50-1.80% Ni, 0.20-0.30% Mo | High-stress applications, automotive components, aerospace structures | ASTM A29, ASTM A322 |
| AISI 4340 Forged Black Flat Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.50-1.80% Ni, 0.20-0.30% Mo | Machinery parts, shafts, gears, and heavy-duty components | SAE J403, AMS 6414 |
| AISI 4340 Forged Black Flat Bar | 0.38-0.43% C, 0.70-0.90% Mn, 1.50-1.80% Ni, 0.20-0.30% Mo | Oil and gas industry, construction equipment, military applications | ASTM A829, ISO 683-17 |
Specifications Table
| Material | AISI 4340 |
|---|---|
| Grades | 4340 |
| Standard | ASTM A829 |
| Size Range | 1.0" x 4.0" to 2.0" x 8.0" |
| Length | Up to 20 feet |
| Form | Forged Black Flat Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4340 Forged Black Flat Bar | Carbon: 0.38-0.43%, Manganese: 0.60-0.90%, Phosphorus: ≤0.035%, Sulfur: ≤0.040%, Chromium: 0.70-0.90%, Nickel: 1.65-2.00%, Molybdenum: 0.15-0.25% | High strength applications, aerospace components, automotive parts, gears, and shafts. |
| AISI 4340 Alloy Steel | Carbon: 0.38-0.43%, Manganese: 0.60-0.90%, Phosphorus: ≤0.035%, Sulfur: ≤0.040%, Chromium: 0.70-0.90%, Nickel: 1.65-2.00%, Molybdenum: 0.15-0.25% | Used in heavy machinery, oil and gas drilling, and high-stress components. |
| AISI 4340 Quenched and Tempered | Carbon: 0.38-0.43%, Manganese: 0.60-0.90%, Phosphorus: ≤0.035%, Sulfur: ≤0.040%, Chromium: 0.70-0.90%, Nickel: 1.65-2.00%, Molybdenum: 0.15-0.25% | Ideal for structural components requiring high toughness and fatigue resistance. |
| AISI 4340 Heat Treated | Carbon: 0.38-0.43%, Manganese: 0.60-0.90%, Phosphorus: ≤0.035%, Sulfur: ≤0.040%, Chromium: 0.70-0.90%, Nickel: 1.65-2.00%, Molybdenum: 0.15-0.25% | Commonly used in manufacturing aircraft landing gear and other structural components. |
| AISI 4340 Cold Drawn | Carbon: 0.38-0.43%, Manganese: 0.60-0.90%, Phosphorus: ≤0.035%, Sulfur: ≤0.040%, Chromium: 0.70-0.90%, Nickel: 1.65-2.00%, Molybdenum: 0.15-0.25% | Suitable for applications requiring precise dimensions and improved surface finish. |
Available Sizes of AISI 4340 Forged Black Flat Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 x 50 | 20 x 80 |
| 15 x 60 | 25 x 100 |
| 20 x 70 | 30 x 120 |
| 25 x 75 | 40 x 150 |
| 30 x 80 | 50 x 200 |
| 35 x 90 | 60 x 250 |
| 40 x 100 | 70 x 300 |
| 45 x 110 | 80 x 350 |
| 50 x 120 | 90 x 400 |
| 60 x 150 | 100 x 450 |
Chemical Properties of AISI 4340
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Manganese (Mn) | 0.60 - 0.80 |
| 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 (MPa) | 1080 - 1175 |
| Yield Strength (MPa) | 930 - 1000 |
| Elongation (%) | 12 - 15 |
| Hardness (HB) | 248 - 302 |
| Modulus of Elasticity (GPa) | 210 |
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 |
| 460 | 100 - 300 | Heat Treated |
| 420 | 300 - 600 | High Temperature |
Electrical Resistivity of AISI 4340 Forged Black Flat Bar
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 75 | 20 | As Forged |
| 78 | 100 | |
| 80 | 200 | |
| 82 | 300 | |
| 85 | 400 | |
Equivalent of AISI 4340 Forged Black Flat Bar
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A29 | 1.6582 | 4340 |
| SAE J403 | 1.6582 | 4340 |
Manufacturing Process & Heat Treatment of AISI 4340
Annealing
The annealing process for AISI 4340 involves heating the material to a temperature range of approximately 850-900°C, followed by a slow cooling process. This treatment is designed to reduce hardness, improve machinability, and relieve internal stresses within the steel, resulting in a more uniform microstructure.
Forging
The forging of AISI 4340 is performed at elevated temperatures, typically between 1100-1250°C. This process involves shaping the steel through compressive forces, which enhances its mechanical properties by refining the grain structure and improving strength and toughness. The forged black flat bars are then allowed to cool gradually to room temperature.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 850-900 | Oil or Water | Increase hardness and strength |
| Tempering | 400-650 | Air | Reduce brittleness and relieve stresses |
| Stress Relieving | 550-650 | Air | Minimize residual stresses from forging and hardening |
The combination of these processes ensures that AISI 4340 forged black flat bars achieve optimal mechanical properties, making them suitable for demanding industrial applications.
Various Types
AISI 4340 Forged Black Flat Bar - Standard
- Width: 2 inches, Thickness: 0.5 inches, Length: 12 feet
- Condition: Hot Rolled
- Applications: Aerospace, Automotive components, Machinery parts
AISI 4340 Forged Black Flat Bar - Heavy Duty
- Width: 3 inches, Thickness: 1 inch, Length: 10 feet
- Condition: Annealed
- Applications: Structural applications, Gear manufacturing, High-stress components
AISI 4340 Forged Black Flat Bar - Custom Sizes
- Width: Custom, Thickness: Custom, Length: Custom
- Condition: Quenched and Tempered
- Applications: Custom engineering projects, Tool making, High-performance applications
AISI 4340 Forged Black Flat Bar - Precision Machined
- Width: 1.5 inches, Thickness: 0.75 inches, Length: 8 feet
- Condition: Machined
- Applications: Precision machinery, High-tolerance components, Aerospace parts
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 Forged Black Flat Bar | 3 mm | $5.00 – $5.50 | ₹410 – ₹450 |
| AISI 4340 Forged Black Flat Bar | 6 mm | $4.80 – $5.30 | ₹390 – ₹440 |
| AISI 4340 Forged Black Flat Bar | 10 mm | $4.50 – $5.00 | ₹370 – ₹420 |
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
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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.