Stainless Steel 309H Plates
ASC LLP is your trusted source for high-quality 309H stainless steel plates. Known for their exceptional durability, high-temperature resistance, and superior corrosion resistance, these plates are an ideal choice for various industrial applications. In this detailed guide, we will explore what stainless steel 309H plates are, their properties, material composition, and the advantages they offer for your specific needs.
What is 309H Stainless Steel Plates?
stainless steel plates 309H are a high-carbon version of the 309 stainless steel alloy. The “H” in 309H stands for “high carbon,” which means these plates contain a higher carbon content compared to standard 309 stainless steel. This increased carbon content enhances the material’s high-temperature strength and stability, making it suitable for applications that involve prolonged exposure to elevated temperatures.

Properties of 309H Stainless Steel Plates
The properties of 309H stainless steel plates make them a preferred choice in many industries. Here are some key characteristics:
1. High-Temperature Resistance
One of the standout properties of 309H SS plates is their exceptional resistance to high temperatures. These plates can withstand temperatures up to 1035°C (1900°F) without losing their structural integrity. This makes them ideal for use in environments where extreme heat is a factor, such as in furnaces, heat exchangers, and chemical processing equipment.
2. Corrosion Resistance
SS 309H plates offer excellent resistance to oxidation and corrosion. This resistance is particularly notable in environments with high sulfur content and other aggressive elements. The alloy’s ability to resist corrosion at elevated temperatures further extends its lifespan in harsh operating conditions.
3. High Carbon Content
The higher carbon content in SS 309H plates enhances their mechanical properties, including tensile strength and hardness. This makes them more robust and capable of withstanding mechanical stress, which is crucial in demanding applications.
4. Versatility
These plates are highly versatile and can be used in various applications, including boiler components, heat treatment equipment, kiln linings, and more. Their versatility is a testament to their superior performance in different industrial environments.
Advantages of 309H Stainless Steel Plates
1. Superior High-Temperature Performance
The ability of 309H SS plates to maintain their strength and integrity at high temperatures is one of their most significant advantages. This makes them indispensable in industries such as petrochemical, power generation, and thermal processing.
2. Enhanced Durability
The robust nature of 309H SS plates, due to their high carbon content, means they can withstand harsh conditions and mechanical stresses better than many other stainless steel grades. This durability translates to longer service life and reduced maintenance costs.
3. Excellent Corrosion Resistance
In environments where corrosive elements are present, stainless steel plates 309H provide superior protection against rust and corrosion. This property ensures that the plates remain functional and reliable even in challenging conditions.
4. Versatility in Applications
The versatility of 309H SS plates allows them to be used in a wide range of applications, from high-temperature industrial processes to architectural projects requiring aesthetic appeal and structural integrity.
5. Cost-Effectiveness
Although the initial cost of SS 309H plates may be higher than some other materials, their longevity and reduced need for frequent replacement make them a cost-effective choice in the long run. Investing in these plates means investing in reliability and performance.


Schedule and Size Chart for 309H SS Plates
Thickness (mm) | Width (mm) | Length (mm) |
3.0 – 6.0 | 1000 – 1500 | 2000 – 6000 |
6.1 – 12.0 | 1000 – 2000 | 2000 – 6000 |
12.1 – 20.0 | 1000 – 2500 | 2000 – 6000 |
20.1 – 50.0 | 1000 – 2500 | 2000 – 6000 |
Mechanical Properties Chart
Property | Value |
Tensile Strength | 620 MPa (90 ksi) |
Yield Strength | 275 MPa (40 ksi) |
Elongation | 40% |
Hardness, Rockwell B (HRB) | ≤ 95 |
Modulus of Elasticity | 200 GPa (29,000 ksi) |
Specifications Chart
Standard | Specification |
ASTM | ASTM A240 / A240M |
ASME | ASME SA240 / SA240M |
EN | 1.4828 |
JIS | SUS 309H |
UNS | S30909 |
Chemical Composition Chart
Element | Composition (%) |
Chromium | 22.0 – 24.0 |
Nickel | 12.0 – 15.0 |
Carbon | 0.04 – 0.10 |
Manganese | 2.0 max |
Silicon | 1.0 max |
Phosphorus | 0.045 max |
Sulfur | 0.030 max |
Physical Properties Chart
Property | Value |
Density | 7.89 g/cm³ |
Melting Point | 1400 – 1450 °C (2550 – 2650 °F) |
Thermal Conductivity | 14.2 W/m·K at 100°C |
Specific Heat Capacity | 500 J/kg·K |
Electrical Resistivity | 0.94 µΩ·m at 20°C |
Application Chart
Industry | Application |
Chemical Processing | Reaction vessels, storage tanks, piping systems |
Power Generation | Superheater tubes, boiler baffles, heat exchanger tubes |
Furnace and Heat Treatment | Furnace linings, heat treatment trays |
Petrochemical | Refinery equipment, catalytic converters |
Food Processing | High-temperature cooking and baking equipment |
Aerospace | Exhaust systems, jet engine components |
Why Choose ASC LLP for 309H SS Plates?
At ASC LLP, we are committed to providing our clients with top-quality stainless steel products that meet their specific needs. Our 309H stainless steel plates are sourced from reputable manufacturers and adhere to stringent quality standards. Here’s why you should choose us:
- Extensive Inventory: We maintain a comprehensive stock of 309H stainless steel plates in various sizes and thicknesses to meet diverse requirements.
- Quality Assurance: Our products undergo rigorous quality checks to ensure they meet industry standards and exceed client expectations.
- Expertise: With years of experience in the industry, our team of experts can provide valuable insights and guidance to help you choose the right materials for your applications.
- Customer Service: We pride ourselves on our exceptional customer service, ensuring timely deliveries and responsive support for all your needs.
309H SS plates offer a blend of high-temperature resistance, corrosion resistance, and mechanical strength, making them an excellent choice for a wide range of industrial applications. At ASC LLP, we provide top-quality stainless steel 309H plates that meet your specific requirements, backed by our commitment to quality and customer satisfaction. Contact us today to learn more about our products and how we can help meet your industrial needs.
Global Reach
Amardeep Steel Centre boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality stainless steel 309H plates. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.

Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.