347H stainless steel rod introduction
347H stainless steel is an austenitic stainless steel that has excellent intergranular corrosion resistance and high temperature strength by adding a niobium (Nb) stabilizing element. It is widely used in chemical, petroleum, electric power and other industries under high temperature environment.

Main parameter
Chemical composition (typical value) :

• Carbon (C): 0.04-0.10%
• Silicon (Si): ≤1.00%
• Manganese (Mn): ≤2.00%
• Phosphorus (P): ≤0.045%
• Sulfur (S): ≤0.030%
• Chromium (Cr): 17.0-19.0%
• Nickel (Ni): 9.0-13.0%
• Nb (Nb): 10×C% ~ 1.10%

Mechanical properties (room temperature) :

• Tensile strength: ≥515 MPa
• Yield strength: ≥205 MPa
• Elongation: ≥35%
• Hardness: ≤192 HB
• Physical properties:
• Density: 7.98 g/cm³
• Melting point: 1398-1427°C
• Coefficient of thermal expansion: 16.6μm /m·°C (20-100°C)
• Thermal conductivity: 16.3W /m·K (100°C)

Specification of 347H Stainless Steel Bar

• Diameter range: usually 5mm to 300mm (can be customized)
• Length: The standard length is 3000mm or 6000mm, and can also be customized according to customer requirements.

Standard of 347H Stainless Steel Bar
347H stainless steel rods are manufactured and inspected in accordance with the following international standards:

• ASTM A479/A479M: Standard for high temperature Stainless Steel bars
• ASTM A276: Standard for Stainless Steel bars and profiles
• EN 10088-3: European standard for stainless steel
• GB/T 1220: China stainless steel bar standard

Peculiarity of 347H Stainless Steel Bar

• Intergranular corrosion resistance: by adding niobium element, effectively prevent chromium carbide precipitation, avoid intergranular corrosion.
• High temperature strength: maintains high mechanical strength and oxidation resistance under high temperature environment.
• Good weldability: suitable for a variety of welding processes, stable performance after welding.
• Oxidation resistance: Excellent performance in high temperature oxidation environment.

Advantage of 347H Stainless Steel Bar

• Excellent high temperature performance: suitable for high temperature environment below 800°C.
• Strong corrosion resistance: Good performance in acidic and alkaline media.
• Long life: Long-term stability in harsh conditions, reducing maintenance and replacement costs.
• Wide applicability: can be used in a variety of industrial fields to meet the needs of complex working conditions.

Similar Grade of 347H Stainless Steel Bar

• United States: UNS S34709
• Europe: 1.4961 (EN)
• Germany: X6CrNiNb18-10 (Werkstoff Nr.)
• Japan: SUS347H (JIS)
• China: 0Cr18Ni11Nb (GB/T 1220)

Application of 347H Stainless Steel Bar

• 347H stainless steel rods are widely used in the following fields:
• Chemical industry: reactor, heat exchanger, pipeline system.
• Oil and gas: downhole tools, valves, pump components.
• Electricity: boiler components, superheaters, heat exchangers.
• Aerospace: high-temperature components, engine parts.
• Food processing: high temperature equipment, pipeline.
• Other: high temperature furnace components, heat exchangers, fasteners.

347H stainless steel rod with its excellent high temperature strength, corrosion resistance and good processing properties, become the ideal material choice in high temperature, corrosive environment. Its wide range of application areas and stable performance make it an important position in several industries.