AISI 4340 Forged Black Flat Bar exporter in Singapore
AISI 4340 Forged Black Flat Bar exporter in Singapore offers high-strength alloy steel products tailored for demanding industrial applications. Known for its excellent toughness, fatigue resistance, and hardenability, AISI 4340 is a nickel-chromium-molybdenum steel widely used in critical components requiring superior mechanical properties. The flat bars are forged to enhance grain structure and dimensional stability, ensuring consistent performance in structural and mechanical assemblies.
The black finish on these flat bars provides a protective layer against corrosion and surface damage during transportation and storage, making them ideal for export purposes. Typically available in various thicknesses and widths, these bars meet stringent industry standards such as ASTM A29 and SAE J1392, ensuring compatibility with engineering specifications. Their versatility allows customization in terms of length and surface treatment to meet specific client requirements.
Industries including aerospace, automotive, heavy machinery, and oil and gas rely on these alloy steel bars for manufacturing components such as gears, shafts, bolts, and high-stress structural parts. The superior fatigue strength and weldability of AISI 4340 make it a preferred choice for applications subjected to dynamic loads and harsh operating environments. Additionally, the forged nature of the bars improves resistance to impact and wear, extending the service life of the finished products.
Export readiness is a key consideration, with suppliers ensuring compliance with international quality certifications and packaging standards to facilitate smooth logistics and customs clearance. The supply chain is optimized to provide timely delivery across global markets, supported by detailed material test reports and traceability documentation. This commitment to quality and service makes Singapore a strategic hub for distributing premium alloy steel products to the Asia-Pacific region and beyond.
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 in Singapore 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 in Singapore
- 2. How to Choose the Right Manufacturer
- 3.Comparison of AISI 4340 Forged Black Flat Bar exporter in Singapore
- 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 in Singapore
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 in Singapore
| 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 and toughness
- ✔ Excellent fatigue resistance
- ✔ Good machinability and weldability
- ✔ Superior hardenability for improved performance
- ✔ Suitable for various applications including automotive and aerospace
- ✔ Available in different sizes and specifications
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 (0.60-0.80%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | Used in high-stress applications including gears, shafts, and aircraft components | ASTM A829, SAE J403 |
| AISI 4340 Forged Black Flat Bar | Carbon (0.38-0.43%), Manganese (0.60-0.80%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | Ideal for applications requiring high tensile strength and toughness | AMS 6349, ISO 683-1 |
| AISI 4340 Forged Black Flat Bar | Carbon (0.38-0.43%), Manganese (0.60-0.80%), Chromium (0.70-0.90%), Nickel (1.65-2.00%), Molybdenum (0.15-0.25%) | Commonly used in the automotive and aerospace industries | ASTM A322, SAE J404 |
Specifications Table
| Material | AISI 4340 |
|---|---|
| Grades | 4340 |
| Standard | ASTM A829 |
| Size Range | 20mm x 100mm to 50mm x 300mm |
| Length | Up to 6000mm |
| Form | Forged Black Flat Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| AISI 4340 | 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% | Industrial machinery, aerospace components, automotive parts, and heavy-duty equipment. |
| AISI 4340 HT | 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%, Heat Treatment: quenched and tempered | High-strength applications, such as shafts, gears, and aircraft landing gear. |
| AISI 4340 V | 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%, Vanadium: 0.05-0.15% | Components requiring improved toughness and fatigue resistance. |
| AISI 4340 S | 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%, Sulfur: up to 0.05% | Applications needing enhanced machinability while maintaining strength. |
| AISI 4340 E | 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%, Enhanced alloying elements for improved hardenability. | Applications requiring high strength and hardenability, such as tooling and dies. |
Available Sizes of AISI 4340 Forged Black Flat Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 x 50 | 20 x 100 |
| 15 x 75 | 25 x 150 |
| 20 x 80 | 30 x 200 |
| 25 x 100 | 40 x 250 |
| 30 x 120 | 50 x 300 |
| 35 x 150 | 60 x 350 |
| 40 x 200 | 70 x 400 |
| 45 x 250 | 80 x 450 |
| 50 x 300 | 100 x 500 |
| 60 x 350 | 150 x 600 |
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 |
| Nickel (Ni) | 1.65 - 2.00 |
| Chromium (Cr) | 0.70 - 0.90 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Phosphorus (P) | Max 0.035 |
| Sulfur (S) | Max 0.040 |
Mechanical Properties of AISI 4340 Forged Black Flat Bar
| Property | Value |
|---|---|
| Tensile Strength | 1080 - 1500 MPa |
| Yield Strength | 930 - 1170 MPa |
| Elongation | 12 - 18% |
| Reduction of Area | 50% |
| Hardness (Brinell) | 250 - 350 HB |
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 - 1470 °C | 2600 - 2678 °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 |
| 460 | 20 - 100 | Annealed |
| 450 | 100 - 200 | Tempered |
| 420 | 200 - 400 | Normalized |
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 |
|---|---|---|
| ASTM A29 | 34CrNiMo6 | G43400 |
| EN 10083-3 | 42CrMo4 | 1.7220 |
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 of approximately 850-900°C, followed by controlled cooling. This process helps to relieve internal stresses, improve ductility, and refine the microstructure, ensuring better machinability and formability for subsequent operations.
Forging
Forging of AISI 4340 is typically performed at temperatures ranging from 1150-1250°C. The hot working process enhances the mechanical properties by refining the grain structure and improving the toughness of the material. After forging, the bars are allowed to cool in air to room temperature.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 850-880 | Oil | To increase hardness and strength |
| Tempering | 400-600 | Air | To reduce brittleness and improve toughness |
| Stress Relieving | 600-700 | Air | To relieve residual stresses from the manufacturing process |
The comprehensive heat treatment process ensures that AISI 4340 forged black flat bars achieve the desired balance of hardness, strength, and toughness, making them suitable for various industrial applications.
Various Types
AISI 4340 Forged Black Flat Bar - Standard
- Width: 50 mm, Thickness: 10 mm, Length: 3 m
- Condition: Hot Rolled
- Applications: Aerospace, Automotive, and Machinery Components
AISI 4340 Forged Black Flat Bar - High Strength
- Width: 75 mm, Thickness: 15 mm, Length: 2 m
- Condition: Quenched and Tempered
- Applications: Heavy Machinery, Structural Applications
AISI 4340 Forged Black Flat Bar - Custom Sizes
- Width: Customizable, Thickness: Customizable, Length: Customizable
- Condition: Normalized
- Applications: Specialized Industrial Applications
AISI 4340 Forged Black Flat Bar - Corrosion Resistant
- Width: 100 mm, Thickness: 20 mm, Length: 4 m
- Condition: Surface Treated
- Applications: Marine and Chemical Processing Industries
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 | $3.50 – $4.00 | ₹290 – ₹330 |
| AISI 4340 Forged Black Flat Bar | 6 mm | $3.20 – $3.80 | ₹260 – ₹310 |
| AISI 4340 Forged Black Flat Bar | 10 mm | $3.00 – $3.50 | ₹240 – ₹290 |
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 in Singapore
- AISI 4340 Flat Bar Manufacturer
- AISI 4340 Alloy Steel Exporter
- AISI 4340 Forged Steel Plate in Singapore
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.