321 Stainless Steel Hot Rolled Coil for Aerospace Use – Thickness 1.5mm to 6.0mm

Product Name: 321 Stainless Steel Hot Rolled Coil for Aerospace Use (Thickness 1.5mm to 6.0mm)

Introduction:

The 321 Stainless Steel Hot Rolled Coil is a versatile and high-performance material designed specifically to meet the stringent requirements of the aerospace industry. Composed primarily of iron, chromium, and nickel, with the addition of titanium, this alloy offers exceptional resistance to intergranular corrosion and oxidation, making it ideal for high-temperature applications where resistance to thermal stress and fatigue is paramount. With thicknesses ranging from 1.5mm to 6.0mm, these coils provide optimal flexibility for a wide array of aerospace components, delivering both durability and performance.

Material Composition and Characteristics:

1. Chemical Composition:

The primary alloying elements of 321 Stainless Steel include chromium (17-19%), nickel (9-12%), and titanium (up to 0.7%). The inclusion of titanium stabilizes the alloy against the formation of chromium carbides, particularly in environments with temperatures ranging from 427°C to 816°C (800°F to 1500°F). This stabilization allows 321 stainless steel to resist intergranular corrosion even after exposure to elevated temperatures for prolonged periods.

2. Mechanical Properties:

• Yield Strength: 205 MPa (30 ksi) minimum

• Tensile Strength: 515 MPa (75 ksi) minimum

• Elongation: 40% in 50mm

• Hardness: Max. 217 HB (Brinell Hardness)

These mechanical properties ensure that 321 stainless steel maintains its integrity and resilience under high-stress conditions, common in aerospace environments.

3. Thermal Properties:

321 stainless steel exhibits excellent performance at high temperatures, making it an ideal choice for aerospace applications that are subjected to frequent thermal cycling. The alloy maintains its mechanical strength and resists scaling at temperatures as high as 870°C (1600°F).

4. Corrosion Resistance:

Due to its balanced chemical composition, 321 stainless steel offers superior corrosion resistance in harsh environments, particularly when exposed to oxidizing conditions at elevated temperatures. This makes it particularly suitable for exhaust systems, gas turbine components, and other high-heat applications in aerospace.

Manufacturing Process:

1. Hot Rolling:

The hot rolling process for 321 stainless steel involves heating the material above its recrystallization temperature, typically between 1100°C to 1250°C. This allows the material to be shaped into coils with precise thicknesses ranging from 1.5mm to 6.0mm. The hot rolling process enhances the ductility and toughness of the material, making it more suitable for forming and shaping aerospace components.

2. Finishing and Quality Control:

After hot rolling, the material undergoes a finishing process that includes annealing to relieve internal stresses and refine the grain structure. The coils are then subjected to rigorous quality control measures to ensure compliance with aerospace industry standards. This includes testing for mechanical properties, dimensional accuracy, and surface quality.

Applications in Aerospace:

321 Stainless Steel is extensively used in the aerospace industry due to its ability to withstand high temperatures, resist corrosion, and maintain structural integrity under stress. Its versatility makes it suitable for a wide range of aerospace applications, including:

1. Exhaust Systems:

321 Stainless Steel is commonly used in the manufacturing of exhaust systems for aircraft engines due to its superior thermal fatigue resistance. It maintains its strength and resists oxidation, even at high temperatures, ensuring the long-term performance of critical components.

2. Aircraft Structural Components:

The material’s excellent mechanical properties and resistance to corrosion make it ideal for structural components that require high strength, such as engine mounts, manifolds, and exhaust ducts. The added benefit of titanium stabilization enhances its performance in environments with fluctuating thermal cycles.

3. Heat Shields and Insulation Components:

321 Stainless Steel is used for heat shields and other insulating components that need to protect sensitive areas of aircraft from excessive heat exposure. Its excellent thermal properties ensure that it remains dimensionally stable and continues to perform effectively in high-temperature environments.

4. Turbine and Compressor Blades:

Given its resistance to creep and stress rupture, 321 stainless steel is a preferred material for turbine and compressor blades in aircraft engines. These components operate at extremely high temperatures and pressures, and 321 stainless steel provides the required durability and stability.

Advantages of 321 Stainless Steel in Aerospace:

1. Thermal Stability:

The alloy’s high-temperature strength makes it a superior choice for aerospace applications that involve exposure to elevated temperatures. Its resistance to thermal expansion and deformation ensures that components maintain their dimensions and performance over time.

2. Oxidation and Corrosion Resistance:

321 Stainless Steel offers excellent resistance to oxidation and corrosion in both low and high-temperature environments. This feature ensures that aerospace components remain intact, even after prolonged exposure to moisture, chemicals, or other corrosive agents.

3. Enhanced Mechanical Strength:

With its high yield and tensile strength, 321 Stainless Steel can endure the demanding conditions of aerospace applications. The material’s ability to maintain its mechanical properties at high temperatures extends the service life of components, reducing the need for frequent maintenance and replacement.

4. Improved Durability and Longevity:

The inclusion of titanium in the alloy composition enhances its durability, reducing the risk of cracking or failure due to thermal fatigue. This feature is particularly important in aerospace applications, where failure can lead to catastrophic consequences.

Dimensional Specifications and Tolerances:

• Thickness: 1.5mm to 6.0mm (±0.05mm tolerance)

• Width: Up to 2000mm (subject to customer requirements)

• Length: Coils can be supplied in custom lengths to meet specific customer needs

• Edge Finish: Available with mill edge or slit edge, depending on application requirements

• Surface Finish: Typically supplied with a hot rolled finish, suitable for further processing, such as pickling or polishing, depending on the end-use.

Certifications and Compliance:

321 Stainless Steel Hot Rolled Coil meets the stringent certifications required for aerospace materials, including:

• AMS 5510

• ASTM A240

• EN 10088-2

These standards ensure that the material complies with the necessary mechanical and chemical requirements, making it suitable for critical aerospace applications.

Conclusion:

In summary, the 321 Stainless Steel Hot Rolled Coil is an essential material for aerospace applications that demand high performance, reliability, and safety. Its exceptional resistance to high-temperature oxidation and corrosion, coupled with its robust mechanical properties, make it an ideal choice for a wide range of aerospace components. Whether used in engine parts, exhaust systems, or structural components, 321 Stainless Steel ensures superior durability and performance in the most demanding environments. With thicknesses ranging from 1.5mm to 6.0mm, it offers flexibility in design while meeting the exacting standards of the aerospace industry.

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Product Inventory

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Packing and Shipping:

DELIVERY SERVICE COMMITMENT:

The goods shall be delivered in strict accordance with the contract, and the consignee shall be notified within 48 hours after thegoods are delvered: Loading shall be carried out in strict accordance with the requlations. without overloading, bias and weiahtgathering