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Technical Specifications
Product Overview
Metallurgical Characteristics
AISI 347 is an austenitic stainless steel stabilized with niobium (columbium) to prevent carbide precipitation and intergranular corrosion. The niobium content, maintained at a minimum of 10 times the carbon content, forms stable niobium carbides that prevent chromium carbide formation at grain boundaries. This stabilization mechanism ensures excellent corrosion resistance even after exposure to sensitizing temperatures between 425-870°C.
Heat Treatment & Processing
MetalZenith employs controlled solution annealing at 1040-1150°C followed by rapid cooling to achieve optimal microstructure. Our advanced heat treatment facilities feature precise atmosphere control and uniform heating zones to ensure consistent properties throughout the material cross-section. Post-annealing treatments include descaling, pickling, and optional stress relieving at 870-900°C for enhanced dimensional stability.
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 utilize computer-controlled rolling mills and forging presses to achieve precise dimensional control and optimal grain flow. Cold working processes employ advanced multi-stand mills with tension control systems for superior surface finish and mechanical properties.
Quality Standards & Testing
MetalZenith maintains comprehensive quality control protocols including incoming material verification, in-process monitoring, and final product testing. All AISI 347 products undergo chemical analysis via optical emission spectroscopy, mechanical testing per ASTM standards, ultrasonic inspection for internal soundness, and intergranular corrosion testing per ASTM A262 Practice E. Our quality management system ensures full compliance with NACE MR0175, ASME Boiler Code, and nuclear grade specifications when required.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| 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) | 10 × C min, 1.00 max |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Room Temperature) | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation in 50mm | ≥ 40% |
| Hardness (Brinell) | ≤ 217 HB |
| Hardness (Rockwell B) | ≤ 95 HRB |
| Impact Energy (Charpy V-notch, 20°C) | ≥ 120 J |
| Fatigue Limit (107 cycles) | 240 MPa |
| Young's Modulus | 200 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.95 g/cm³ |
| Melting Point | 1400-1450°C |
| Thermal Conductivity (20°C) | 14.2 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 17.3×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.73 µΩ·m |
| Magnetic Permeability | 1.02 (Paramagnetic) |
| Poisson's Ratio | 0.27-0.30 |
📏 Product Specifications
| Product Form | Available Sizes | Standards |
|---|---|---|
| Hot Rolled Plates | Thickness: 6-100mm, Width: up to 2500mm | ASTM A240, ASME SA-240 |
| Cold Rolled Sheets | Thickness: 0.4-6mm, Width: up to 1500mm | ASTM A240, EN 10088-2 |
| Round Bars | Diameter: 6-300mm, Length: up to 6000mm | ASTM A276, ASTM A479 |
| Seamless Tubes | OD: 6-610mm, WT: 1-60mm | ASTM A213, ASTM A312 |
| Welded Pipes | OD: 10-1220mm, WT: 1-40mm | ASTM A312, ASTM A358 |
| Surface Finishes | 2B, BA, No.4, HL, Mirror | ASTM A480 |
| Dimensional Tolerance | ±0.1mm to ±0.5mm | Per ASTM Standards |
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Our Advantages in Processing AISI 347
Advanced Vacuum Melting Technology
MetalZenith employs cutting-edge vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve superior chemical homogeneity and cleanliness in AISI 347 production. Our controlled atmosphere melting ensures optimal niobium distribution and minimizes inclusions for enhanced mechanical properties.
Comprehensive Quality Control System
Our integrated quality management system features real-time process monitoring, advanced spectroscopic analysis, and multi-stage inspection protocols. Every batch undergoes rigorous testing including intergranular corrosion testing per ASTM A262 and high-temperature mechanical property verification.
Custom Processing & Global Supply
MetalZenith offers extensive customization capabilities including precision machining, heat treatment optimization, and special surface finishes. Our global distribution network and strategic inventory management ensure reliable supply chain performance with just-in-time delivery worldwide.
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