ASTM A553 Alloy Steel Tube,Pipe, Grade II

ASTM A553 Alloy Steel Tube, Grade II Product Information -:- For detailed product information, please contact sales. -: ASTM A553 Alloy Steel Tube, Grade II Synonyms -:- For detailed product information, please contact sales. -:

ASTM A553 Alloy Steel, Grade II Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A553 Grade II: Enhanced Strength Quenched and Tempered 9% Nickel Steel Plate** #### **1. Overview** ASTM A553 Grade II is an **enhanced-strength quenched and tempered 9% nickel steel plate** specifically designed for **cryogenic pressure vessel applications** requiring superior mechanical properties at extremely low temperatures. This grade represents the higher strength level within the A553 specification, offering improved yield and tensile strength while maintaining exceptional notch toughness at temperatures as low as -320°F (-196°C). Grade II is particularly suitable for large LNG storage tanks and other critical cryogenic applications where both high strength and reliability are essential. #### **2. Chemical Composition** The chemical composition features enhanced nickel content for superior cryogenic performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.13 max | | Manganese (Mn) | 0.90 max | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 8.50 - 9.50 | | Chromium (Cr) | 0.25 max | | Molybdenum (Mo) | 0.12 max | **Enhanced Composition Features:** - **Higher Nickel Content (8.50-9.50%)**: Provides improved strength and toughness at cryogenic temperatures - **Low Carbon Maximum**: Ensures excellent weldability and notch toughness - **Controlled Manganese**: Optimizes strength-toughness relationship - **Minimized Residual Elements**: Reduces potential for impairment of cryogenic properties #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 110 - 130 ksi (760 - 895 MPa) | | **Yield Strength** | 85 ksi min (585 MPa min) | | **Elongation in 2 inches** | 20% min | | **Charpy V-Notch Impact** | 25 ft-lb min at -320°F (-196°C) | **Superior Cryogenic Performance:** - **Enhanced Low-Temperature Toughness**: Maintains excellent impact properties at liquid natural gas temperatures - **Improved Strength Characteristics**: Higher yield and tensile strength compared to Grade I - **Stable Austenitic Microstructure**: Retains ductility and toughness at cryogenic conditions - **Excellent Fatigue Resistance**: Suitable for dynamic loading in cryogenic service **Physical Properties (Typical):** - **Density**: 0.287 lb/in³ (7,950 kg/m³) - **Modulus of Elasticity**: 28,500 ksi (197 GPa) at room temperature - **Thermal Expansion Coefficient**: 5.7 × 10⁻⁶/°F (10.3 × 10⁻⁶/°C) at -320°F to 68°F - **Thermal Conductivity**: 12.3 W/m·K at -320°F (-196°C) - **Magnetic Permeability**: Typically less than 1.05 at cryogenic temperatures #### **4. Product Applications** Grade II is specified for demanding cryogenic applications requiring enhanced strength: **Large-Scale LNG Infrastructure:** - Large-capacity LNG storage tanks - LNG carrier containment systems - LNG processing plant equipment - LNG export terminal components **Industrial Gas Production:** - Large liquid nitrogen and oxygen storage vessels - Cryogenic air separation units - Industrial gas production facilities - Bulk cryogenic liquid storage **Advanced Cryogenic Systems:** - High-capacity cryogenic storage facilities - Advanced research cryostats - Superconducting magnet containers - Space application cryogenic tanks #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-4** | X8Ni9 | Enhanced strength variant | | **Europe** | **EN 10028-4** | X8Ni9 | Cryogenic nickel steel | | **Japan** | **JIS G3127** | SL9N590 | 9% nickel steel equivalent | | **Germany** | **DIN 17280** | X8Ni9 | Premium cryogenic steel | **Grade Comparison within A553:** | Parameter | Grade I | Grade II | |-----------|---------|----------| | **Nickel Content** | 8.00-9.00% | 8.50-9.50% | | **Yield Strength Minimum** | 75 ksi | 85 ksi | | **Tensile Strength Range** | 100-120 ksi | 110-130 ksi | | **Typical Applications** | Standard Cryogenic Vessels | Enhanced Cryogenic Applications | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heat requirement**: Generally not required due to metallurgical characteristics - **Post-weld heat treatment**: Usually not specified to preserve cryogenic properties - **Welding consumables**: High-nickel content electrodes (typically 60-70% Ni) - **Welding processes**: SMAW, GTAW, GMAW with proper procedure qualification **Heat Treatment:** - **Double Normalizing and Tempering**: Standard thermal processing - **Normalizing temperature**: 1475-1525°F (802-829°C) - **Tempering temperature**: 1050-1150°F (566-621°C) - **Quenching**: Water quenching from normalizing temperature **Quality Control Requirements:** - **Impact testing**: Mandatory at -320°F (-196°C) for each heat - **Tension tests**: From each heat treatment charge - **Ultrasonic examination**: Required for pressure vessel quality plates - **Hardness testing**: Typically 210-250 HBW --- **Technical Advantages:** - **Enhanced strength** while maintaining cryogenic toughness - **Excellent weldability** without pre-heat requirements - **Proven performance** in large-scale LNG applications - **Superior fracture toughness** at extreme low temperatures **Design Considerations:** - **ASME Section VIII Division 2** design methodology applicable - **Cryogenic service** capability to -320°F (-196°C) - **Fracture mechanics design** essential for large structures - **Thermal stress analysis** critical for design integrity **Service Limitations and Guidelines:** - **Minimum design temperature**: -320°F (-196°C) - **Maximum service temperature**: 500°F (260°C) - **Corrosion protection**: Required for certain environments - **Quality verification**: Enhanced testing for critical applications **Disclaimer:** This technical information is for reference purposes only. For cryogenic pressure vessel applications, particularly for LNG service, consult the latest ASTM A553 specification and applicable ASME Code requirements. Material selection, fabrication, and testing must be approved by qualified engineers with specific experience in cryogenic applications and must comply with all relevant regulatory standards, including those specific to LNG facilities. -:- For detailed product information, please contact sales. -: ASTM A553 Alloy Steel, Grade II Specification Dimensions Size： Diameter 20-1000 mm Length <4461 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: ASTM A553 Alloy Steel, Grade II Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A553 Alloy Steel Tube, Grade II -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A553 Alloy Steel Tube, Grade II -:- For detailed product information, please contact sales. -:

Packing of ASTM A553 Alloy Steel Tube, Grade II -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 932 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition