SUS347H Stainless Steel Plate & Coil: High-Carbon Niobium-Tantalum Stabilized Extreme High-Temp Plate/Coil

What is SUS347H Stainless Steel Plate & Coil?

SUS347H stainless steel plate & coil is the high-carbon variant of SUS347, optimized for maximum high-temperature creep strength by combining high carbon content with niobium-tantalum stabilization. It serves critical high-temperature, high-pressure plate/coil systems.

Equivalent Grades (Horizontal)

UNS: S34709 | JIS: SUS347H | GB: 07Cr18Ni11Nb | EN: X7CrNiNb18-10 | W.Nr.: 1.4550

Chemical Composition (wt%, Horizontal)

C: 0.04-0.10 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 17.00-19.00 | Ni: 9.00-13.00 | Nb+Ta: ≥10×C | Fe: Balance

Key Properties (20°C, Annealed, Horizontal)

Density: 7.93g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness: ≤201HB

Core Characteristics

• High-carbon & Nb-Ta dual optimization: Delivers exceptional high-temperature creep strength at 600-900°C, exceeding SUS347 • Outstanding post-weld corrosion resistance: Ensures long-term reliability in high-temperature corrosive environments for plate/coil components • Mandatory post-weld annealing: Optimizes high-temperature performance and structural uniformity, meeting critical equipment requirements • Critical component dedicated: Suitable for nuclear power plant plates, large boiler high-pressure high-temp coils and extreme high-stress components

SUS347H vs SUS347 Stainless Steel Plate & Coil (Horizontal)

Carbon Content: SUS347H (0.04-0.10%) | SUS347 (≤0.08%) | Creep Strength: SUS347H (Excellent) | SUS347 (Good) | Annealing: SUS347H (Mandatory) | SUS347 (Optional) | Application: SUS347H (Critical High-Stress) | SUS347 (General High-Temp)

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.