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Technical Specifications
Product Overview
Metallurgical Characteristics
AISI 304H is an austenitic stainless steel with a face-centered cubic crystal structure. The higher carbon content (0.04-0.10%) compared to standard 304 grade provides enhanced creep resistance and improved mechanical properties at elevated temperatures. The austenitic microstructure is stabilized by the balanced chromium-nickel composition, ensuring excellent corrosion resistance and formability.
Heat Treatment Process
MetalZenith employs controlled solution annealing at temperatures between 1040-1120°C, followed by rapid cooling to achieve optimal microstructure. This process dissolves carbides and ensures uniform austenitic structure throughout the material. The controlled cooling rate prevents sensitization and maintains corrosion resistance properties.
Manufacturing Process Excellence
Our advanced manufacturing process begins with carefully selected raw materials melted in electric arc furnaces with precise temperature and atmosphere control. Secondary refining processes including AOD (Argon Oxygen Decarburization) ensure optimal chemical composition and cleanliness. Hot rolling, cold rolling, and precision finishing operations are performed under strict quality control to achieve desired mechanical properties and surface finish.
Quality Standards & Testing
MetalZenith maintains compliance with international standards including ASTM A240, EN 10088-2, and JIS G4305. Comprehensive testing protocols include chemical analysis using optical emission spectrometry, mechanical testing per ASTM standards, intergranular corrosion testing (ASTM A262), and non-destructive examination including ultrasonic testing and dye penetrant inspection.
Corrosion Resistance & Performance
The 18-20% chromium content provides excellent general corrosion resistance, while the 8-10.5% nickel ensures austenitic stability and enhanced resistance to stress corrosion cracking. AISI 304H demonstrates superior performance in oxidizing environments and maintains structural integrity at temperatures up to 870°C in continuous 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) | 18.0 - 20.0 |
| Nickel (Ni) | 8.0 - 10.5 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (min) | 515 MPa |
| Yield Strength 0.2% Offset (min) | 205 MPa |
| Elongation in 50mm (min) | 40% |
| Reduction of Area (min) | 50% |
| Hardness (Brinell) | ≤ 201 HB |
| Hardness (Rockwell B) | ≤ 92 HRB |
| Impact Energy (Charpy V-notch at 20°C) | ≥ 120 J |
| Fatigue Limit (10^7 cycles) | 240 MPa |
| Modulus of Elasticity | 200 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Point | 1400-1450°C |
| Thermal Conductivity (at 100°C) | 16.2 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 17.2×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (at 20°C) | 0.72 µΩ·m |
| Magnetic Permeability | 1.02 (Non-magnetic) |
| Thermal Diffusivity | 4.2×10-6 m²/s |
| Curie Temperature | N/A (Austenitic) |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Coils, Bars, Rods, Tubes, Pipes, Forgings |
| Plate Thickness | 6mm - 200mm |
| Sheet Thickness | 0.4mm - 6mm |
| Bar Diameter | 6mm - 300mm |
| Tube Outer Diameter | 6mm - 610mm |
| Standards | ASTM A240, A479, A312, EN 10088-2, JIS G4305, GB/T 3280 |
| Surface Finish | 2B, BA, No.4, HL (Hairline), Mirror, Pickled |
| Tolerance | ±0.1mm (thickness), ±3mm (width), ±6mm (length) |
| Edge Condition | Mill Edge, Slit Edge, Trimmed Edge |
| Heat Treatment | Solution Annealed (1040-1120°C) |
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Our Advantages in Processing AISI 304H
Advanced Electric Arc Furnace Technology
MetalZenith utilizes cutting-edge electric arc furnace technology with precise temperature control and advanced refining processes to achieve optimal carbon content (0.04-0.10%) in AISI 304H, ensuring superior high-temperature creep resistance and mechanical properties.
Comprehensive Quality Control System
Our state-of-the-art testing laboratory features advanced spectrometers, universal testing machines, and metallographic equipment. Every batch undergoes rigorous chemical analysis, mechanical testing, and microstructural examination to guarantee compliance with international standards.
Custom Processing & Global Distribution
MetalZenith offers extensive customization capabilities including precision cutting, surface finishing, and heat treatment services. Our global distribution network ensures timely delivery worldwide with comprehensive technical support and engineering consultation services.
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