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Technical Specifications
Product Overview
Metallurgical Characteristics
AISI 347H is an austenitic stainless steel with enhanced carbon content (0.04-0.10%) compared to standard 347 grade, specifically designed for superior high-temperature performance. The niobium stabilization prevents chromium carbide precipitation, maintaining corrosion resistance and mechanical properties at elevated temperatures up to 870°C. The austenitic structure provides excellent toughness and ductility across a wide temperature range.
Heat Treatment Processes
MetalZenith employs precise solution annealing at 1040-1150°C followed by rapid cooling to achieve optimal microstructure. Our controlled atmosphere furnaces prevent surface oxidation and ensure uniform heating throughout the material cross-section. Post-annealing stress relief treatments are available for complex geometries to minimize residual stresses.
Manufacturing Process Excellence
Our integrated manufacturing process begins with vacuum induction melting using premium raw materials, followed by electroslag remelting for enhanced cleanliness. Hot working operations are performed within precise temperature windows to optimize grain structure, while cold working processes achieve required mechanical properties and dimensional accuracy. Advanced thermomechanical processing ensures consistent metallurgical properties throughout each production lot.
Quality Standards & Testing
Every batch undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical testing per ASTM standards, ultrasonic examination, and metallographic evaluation. Creep testing and stress rupture testing validate high-temperature performance characteristics. Complete mill test certificates provide full traceability and compliance documentation for critical applications requiring elevated temperature service.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.04 - 0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.0 - 20.0 |
| Nickel (Ni) | 9.0 - 13.0 |
| Niobium (Nb) | 8×C min - 1.00 max |
| Tantalum (Ta) | ≤ 0.10 |
| Nitrogen (N) | ≤ 0.10 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Room Temperature) | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation in 50mm | ≥ 40% |
| Reduction of Area | ≥ 50% |
| Hardness (Brinell) | ≤ 217 HB |
| Hardness (Rockwell B) | ≤ 95 HRB |
| Impact Energy (Charpy V-notch, Room Temp) | ≥ 68 J |
| Fatigue Strength (107 cycles) | 240 MPa |
| Creep Rupture Strength (100,000h at 650°C) | 65 MPa |
| Young's Modulus | 200 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Point | 1400-1450°C |
| Thermal Conductivity (100°C) | 14.2 W/m·K |
| Thermal Conductivity (500°C) | 21.5 W/m·K |
| Thermal Expansion (20-100°C) | 17.3×10-6/K |
| Thermal Expansion (20-500°C) | 18.2×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.73 µΩ·m |
| Magnetic Permeability | 1.02 µH/m (Non-magnetic) |
| Poisson's Ratio | 0.27-0.30 |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, square bars, flat bars, sheets, plates, tubes, pipes, forgings |
| Round Bar Diameter | 6mm - 300mm |
| Square Bar Size | 10mm - 150mm |
| Flat Bar Dimensions | 10-200mm (thickness) × 20-500mm (width) |
| Sheet Thickness | 0.5mm - 6mm |
| Plate Thickness | 6mm - 100mm |
| Tube Outer Diameter | 6mm - 219mm |
| Standards Compliance | ASTM A240, A479, A312, A213, EN 10088, JIS G4305, GB/T 1220 |
| Surface Finishes | Hot rolled, cold rolled, 2B, BA, No.4, hairline, mirror finish |
| Dimensional Tolerance | ±0.1mm to ±0.5mm (depending on product form) |
Let Us Create Success for Your Project
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Our Advantages in Processing AISI 347H
Advanced Vacuum Melting Technology
MetalZenith utilizes state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve exceptional chemical homogeneity and purity in AISI 347H production. Our controlled atmosphere melting eliminates inclusions and ensures optimal niobium distribution for superior high-temperature performance.
Comprehensive Quality Control Systems
Our integrated quality management system features real-time process monitoring, advanced spectroscopic analysis, and complete mechanical testing capabilities. Every batch of AISI 347H undergoes rigorous testing including creep testing, grain size analysis, and corrosion resistance evaluation to guarantee consistent performance.
Custom Engineering & Global Supply
MetalZenith offers complete customization services including specialized heat treatments, precision machining, and application-specific property optimization. Our global distribution network ensures reliable supply chain management with technical support and engineering consultation for critical high-temperature applications worldwide.
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