In modern industry, especially in sectors where components are subjected to extreme heat, high pressure, and corrosive substances, material selection is mission-critical. 347H stainless steel plate is engineered to perform under such demanding conditions, offering an ideal solution for high-temperature and corrosion-prone environments. As an austenitic stainless steel stabilized with niobium (Nb), 347H excels in maintaining mechanical strength, resisting intergranular corrosion, and withstanding thermal cycling—features that make it far superior to standard grades such as 304 or 321 in high-performance applications.

Due to its excellent resistance to heat and oxidation, 347H stainless steel plate is widely used in petrochemical plants, refineries, power generation equipment, industrial furnaces, heat exchangers, boiler systems, and aerospace components. Its unique ability to remain structurally stable at temperatures above 800°C, combined with outstanding weldability and long-term durability, makes it a preferred choice for engineers and designers working in critical infrastructure and heavy industry.

Core Advantages of 347H Stainless Steel Plate

One of the standout features of 347H stainless steel is its high-temperature resistance. Unlike many metals that degrade or lose mechanical integrity above 550°C, 347H can withstand continuous exposure to temperatures above 800°C while retaining strength. This makes it ideal for use in furnace parts, exhaust ducts, and other heat-intensive applications.

Additionally, the niobium stabilization prevents the formation of chromium carbide at grain boundaries during welding or prolonged exposure to elevated temperatures. This ensures excellent intergranular corrosion resistance, especially in environments where sensitization is a risk—such as chemical processing systems and high-temperature reactors.

Its corrosion resistance is also notable. The 347H stainless steel plate performs exceptionally well in environments containing sulfuric acid, phosphoric acid, seawater, and chloride-rich atmospheres. This makes it a reliable choice for offshore oil platforms, marine heat exchangers, and flue gas cleaning systems.

Further, the material adheres to strict international standards, including ASTM A240, ASME SA240, ISO, and JIS. Each batch is subjected to rigorous testing procedures to ensure compliance, including mechanical testing, chemical analysis, and dimensional verification. Certified by ISO9001, CE, and SGS, 347H plates are backed by a 2-year quality guarantee.

Product Characteristics and Manufacturing Scope

347H stainless steel plates are manufactured in a wide range of dimensions. Thickness can range from as thin as 0.3mm up to 150mm, with custom lengths available up to 12 meters. They can be hot-rolled or cold-rolled depending on the application. Standard surface finishes include 2B, No.1, No.4, BA, HL, and mirror-polished 8K.

We offer free customization services to match your project’s exact needs, whether that includes specific length cuts, edging, polishing, or unique packaging solutions. Orders are typically fulfilled within 3 to 5 business days, ensuring fast and efficient delivery worldwide.

Mechanical and Chemical Performance

The mechanical strength of 347H is a significant advantage. With a tensile strength exceeding 520 MPa and a yield strength over 205 MPa, the plate is suitable for pressure-bearing components and load-bearing systems. Its high elongation rate (above 40%) ensures good ductility, making it suitable for complex forming, bending, and welding operations without cracking.

Chemically, 347H stainless steel is composed primarily of iron, with 17–19% chromium and 9–13% nickel. Niobium is added specifically to stabilize the alloy during high-temperature service, eliminating carbide precipitation—a common cause of failure in lesser grades.

Application Scenarios Across Industries

Thanks to its powerful performance characteristics, 347H stainless steel plate is used in a wide range of industries:

• Petrochemical Plants: For reactor linings, pressure vessels, and catalytic converters where corrosion and heat are simultaneous challenges.

• Thermal Power Generation: In superheater coils, reheaters, and boiler components, 347H can handle continuous high temperatures without structural degradation.

• Chemical Processing: Ideal for pipes, tanks, and equipment that encounter acidic or chlorinated environments regularly.

• Aerospace and Automotive: Used in turbine exhausts, heat shields, and high-performance engine components requiring dimensional stability under thermal load.

• Heat Exchangers and Furnaces: Its ability to form a protective oxide layer makes 347H ideal for environments where rapid temperature fluctuation is common.

Why Choose Our 347H Stainless Steel Plate?

We are a professional stainless steel supplier with extensive experience in international export. Choosing us for your 347H stainless steel plate needs means:

• ✅ Factory Direct Pricing: No middlemen. Get competitive prices directly from the manufacturer.

• ✅ Custom Production: Support for OEM and complex engineering requirements, including CNC cutting, waterjet profiling, and laser marking.

• ✅ Quick Turnaround: 3–5 days lead time with global logistics support.

• ✅ Certified Quality: Every order includes complete documentation, mill test reports, and optional third-party inspection.

• ✅ Two-Year Warranty: Confidence in quality backed by a full product guarantee.

Whether you're specifying material for a refinery overhaul, designing high-efficiency power equipment, or sourcing parts for heat-sensitive applications, 347H stainless steel plate offers the durability, stability, and corrosion resistance your project demands.