321H Stainless Steel Sheet Plate
321H stainless steel sheet Plate for high temperature corrosion resistant applications
As a leading stainless steel supplier in China, SEATHER produces and manufactures high cost-effective 321H stainless steel sheet plate for your project.
321H stainless steel is the high-carbon version of 321 stainless steel, designed for superior performance in high-temperature environments. It is also referred to as the UNS S32109 stainless steel.
321H is a specialized austenitic stainless steel engineered for high-temperature stability. Its primary distinction lies in its ability to resist intergranular corrosion within the critical “sensitization” range of 427°C to 816°C.
Grade 321H stainless steel sheet plate in strict accordance with ASTM A240 standard. We supply flat, high-precision materials in various sizes according to the standard. You can confirm with our team any needs.
As an ISO-certified supplier, we are committed to delivering high-quality, corrosion-resistant, and heat-resistant alloy materials to clients worldwide.
321H Stainless Steel Sheet Plate Specifications and Srtandard
| Product Name | 321H Stainless Steel Sheets Plates |
| Grades | 310H/UNS S32109 |
| Standards | JIS, AISI, ASTM, GB, DIN, EN, etc. |
| Thickness | 0.1mm-50.0mm |
| Width | 500mm-2000mm |
| Length | 1000mm-6000mm |
| OEM/ODM | Customized size is available as your request |
| Quantity Tolerance | ±10% |
| Surface Finish | 2B, 2D, 2H, NO.4, No.1,1D, Pickled or as per demand |
| Applications | Stainless Steel Plates are ideally suited for high temperature applications |
| Packaging | Wooden pallet/Wooden case |
| Payment Terms | 30% TT deposit and 70% balance before shipment, 100% LC at sight |
| Delivery Time | 7-10 working days |
| MOQ | 500 Kgs |
| Shipping Port | Shanghai/Ningbo port |
| Sample | The sample of Stainless Steel Plates is available |
| Remark | Stainless Steel Plates can be customized |
321H Stainless Steel Sheet Plate Applications and Usages
Industrial Applications for 321H Stainless Steel
The unique titanium stabilization and high-carbon content of 321H make it the premier choice for environments where high temperatures and corrosive media intersect.
- Aerospace & Aviation: Used extensively in piston engine exhaust manifolds and stack assemblies. Its ability to withstand cyclic heating and resist oxidation at high altitudes is critical for flight safety.
- Chemical Processing: Ideal for high-temperature reaction vessels, heat exchangers, and piping systems handling volatile chemicals that would otherwise cause intergranular corrosion in non-stabilized alloys.
- Expansion Joints: Employed in the manufacturing of bellows and expansion joints. The alloy’s ductility and fatigue resistance allow it to absorb thermal expansion and contraction in high-heat piping systems.
- Petroleum Refining: Specifically utilized for polythionic acid service. It resists stress corrosion cracking in refinery environments where sulfur compounds are present during shutdown and startup cycles.
- Thermal Waste Treatment: Used in the construction of thermal oxidizers and incineration systems, where components are consistently exposed to extreme temperatures and combustion byproducts.
- Food & Pharmaceutical Grade Manufacturing: Applied in high-heat sterilization equipment, storage tanks, and processing lines. The “H” grade ensures structural integrity during high-temperature cleaning cycles (CIP) while maintaining a sanitary, non-reactive surface.
321H Stainless Steel Sheet Plate Drawing and Formula
Formula: m = W (m) × THK (mm) × L (m) × ρ (g/cm³)
W = Width, THK = Thickness, L = Length, ρ = Density
What is 321H Stainless Steel
321H Stainless Steel (UNS S32109) is a premium austenitic alloy specifically engineered for high-heat environments. As a titanium-stabilized grade, it is the industry standard for applications operating within the critical carbide precipitation range of 427°C to 816°C (800°F to 1500°F).
Key Performance Benefits of Type 321H
Superior Thermal Stability: Unlike standard austenitic steels, 321H is designed to maintain structural integrity and corrosion resistance at elevated temperatures.
Intergranular Corrosion Resistance: The addition of Titanium suppresses grain boundary chromium carbide precipitation. This prevents the “sensitization” that often leads to metal fatigue and failure in extreme heat.
Non-Magnetic Properties: In its annealed state, 321H is completely non-magnetic, making it ideal for sensitive electronic and aerospace housing.
Work Hardening: While it cannot be hardened via heat treatment, this alloy responds exceptionally well to cold working to achieve higher tensile strength and hardness.
Why Choose 321H over 321?
The “H” in 321H denotes a higher carbon content, which provides significantly better creep resistance and stress rupture strength at temperatures above 1000°F (537°C). This makes it the preferred choice for heavy-duty industrial components and aerospace exhaust systems.
321H Stainless Steel Sheet Plate Chemical Composition
| ELEMENT | 321 | 321H |
|---|---|---|
| NI | 9.0 – 12.0 | 9.0 – 12.0 |
| C | 0.08 max | 0.04 – 0.10 |
| MN | 2.0 max | 2.0 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.030 max |
| SI | 1.0 max | 1.0 max |
| CR | 17.0 – 19.0 | 17.0 – 19.0 |
| TI | 5(C+N) – 0.70 max | 4(C+N) – 0.70 |
| N | 0.10 max | 0.10 max |
321H Stainless Steel Sheet Plate Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (0.2% offset) | ≥ 205 MPa |
| Elongation (min %) | 40 |
| Max Hardness | 217 Brinell |
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More Information About 321H Stainless Steel Sheet Plate
When you choose to buy 321H Stainless Steel Sheet Plate, there have some important points we need to know before we get started.
Features of 321H Stainless Steel Sheet Plate
321H stainless steel is a versatile, high-performance alloy engineered for extreme environments. Its unique chemical composition offers a distinct competitive advantage in the following areas:
1. High-Temperature Oxidation Resistance
Type 321H provides excellent oxidation resistance at temperatures reaching up to 1500°F (816°C). Unlike other grades that scale or degrade, this alloy maintains its surface integrity, making it ideal for continuous service in high-heat industrial exhaust and furnace components.
2. Superior Low-Temperature Toughness
While optimized for heat, 321H also demonstrates exceptional cryogenic toughness. It retains its mechanical strength and impact resistance at low temperatures, ensuring durability across a wide thermal spectrum.
3. Comparable Corrosion Resistance to Type 304
In most environments, 321H offers corrosion resistance equivalent to Grade 304. It provides a cost-effective solution for general-purpose applications while adding the benefit of titanium stabilization to prevent intergranular corrosion after welding.
4. Excellent Weldability and Fabrication
This alloy is readily weldable using all standard commercial processes, including TIG, MIG, and submerged arc welding. Because it is stabilized against carbide precipitation, it eliminates the need for post-weld annealing in most structural applications.
5. High Ductility and Easy Formability
Despite its strength, 321H is highly ductile and easy to shape. It can be cold-formed, bent, and drawn with minimal risk of cracking, allowing for the manufacturing of complex components like bellows, expansion joints, and intricate manifolds.
How to Purchase 321H Stainless Steel Sheet Plate
When purchasing sheets plates, it’s essential to have the right materials and information to ensure a smooth procurement process and to get the products that meet your needs.
Here’s what you need to provide:
1. Material: Specify the grade material, 321H
2. Size: Specify the plate’s thickness, width, length
3. Quantity: Provide the exact number of plates required for an accurate quotation.
4. Technical specifications: Include technical specifications and drawings. If there are unique design requirements, detailed drawings can be attached.
5. Quality standards: Specify quality standards and inspection requirements, such as the need for third-party inspection, material certification, and inspection reports.
6. Special requirements: Specify any special surface treatment, polishing, corrosion resistance requirements, etc.
7. Packaging requirements: If there are specific packaging needs, such as protective or anti-corrosion packaging, please specify.
8. Delivery time: Specify the expected delivery time and location.
By preparing the above information, you can streamline the process of purchasing plates and ensure that you receive high-quality products that meet your requirements.
321H Stainless Steel Sheet Plate Standards Comparison Table
| STANDARD | SS 321H |
| WERKSTOFF NR. | 1.4878 |
| UNS | S32109 |
| JIS | SUS 321H |
| BS | / |
| KS | / |
| AFNOR | / |
| EN | / |
321H Stainless Steel Sheet Plate Packaging
- Standard export packaging:
Waterproof Paper Winding+PVC Film+Strap Banding+Wooden Pallet or Wooden Case; - Customized packaging as your request (Logo or other contents accepted to be printed on the packaging);
- Other special packaging will be designed as customer’s request;
- Eye to wall and eye to sky are both available;
- By International Express: DHL/UPS/FEDEX/EMS and our own express line;
- By air or By sea;
- Shipping port: Shanghai, Ningbo or as your request.
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