ASTM A543 Low Alloy Steel Foil/Strip, Grade B, Class 2

ASTM A543 Low Alloy Steel Foil, Grade B, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A543 Low Alloy Steel Foil, Grade B, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A543 Low Alloy Steel, Grade B, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A543 Grade B Class 2: High-Strength Nickel-Chromium-Molybdenum Alloy Steel Plate** #### **1. Overview** ASTM A543 Grade B Class 2 is a **high-strength nickel-chromium-molybdenum alloy steel plate** supplied in the **quenched and tempered condition**. This intermediate strength class provides enhanced mechanical properties compared to Class 1 while maintaining excellent low-temperature toughness. Designed for pressure vessel applications requiring superior performance at cryogenic temperatures, this material offers an optimal balance of strength, toughness, and weldability for demanding service conditions. #### **2. Chemical Composition** The chemical composition maintains precise control for enhanced performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.20 max | | Manganese (Mn) | 0.20 - 0.60 | | Phosphorus (P) | 0.025 max | | Sulfur (S) | 0.025 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 2.00 - 3.50 | | Chromium (Cr) | 1.00 - 1.90 | | Molybdenum (Mo) | 0.40 - 0.60 | **Enhanced Composition Features:** - **Optimized Nickel Content (2.00-3.50%)**: Maintains exceptional low-temperature toughness at higher strength levels - **Chromium-Molybdenum Synergy**: Provides enhanced hardenability and strength retention - **Controlled Carbon Equivalent**: Ensures good weldability despite increased strength requirements - **Balanced Alloy System**: Delivers consistent performance in heavy sections #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 115 - 145 ksi (795 - 1000 MPa) | | **Yield Strength** | 95 ksi min (655 MPa min) | | **Elongation in 2 inches** | 15% min | | **Reduction of Area** | 35% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -100°F (-73°C) | **Enhanced Performance Characteristics:** - **Superior Strength-Toughness Combination**: Maintains excellent impact properties at increased strength levels - **Excellent Low-Temperature Performance**: Reliable operation in cryogenic service conditions - **Enhanced Hardenability**: Consistent through-thickness properties in thicker sections - **Stable Mechanical Properties**: Predictable performance under thermal and mechanical cycling **Physical Properties (Typical):** - **Density**: 0.285 lb/in³ (7,890 kg/m³) - **Modulus of Elasticity**: 29,000 ksi (200 GPa) - **Thermal Expansion Coefficient**: 6.3 × 10⁻⁶/°F (11.3 × 10⁻⁶/°C) - **Thermal Conductivity**: 26.0 W/m·K at 212°F (100°C) - **Poisson's Ratio**: 0.29 #### **4. Product Applications** Grade B Class 2 is specified for applications requiring enhanced strength with maintained low-temperature toughness: **Advanced Cryogenic Systems:** - LNG storage tanks and processing equipment - Cryogenic pressure vessels - Low-temperature storage systems - Cryogenic transport and handling equipment **Power Generation:** - Nuclear power plant components - High-pressure turbine casings - Advanced power generation systems - Energy conversion equipment **Chemical Processing:** - High-pressure chemical reactors - Low-temperature process vessels - Petrochemical synthesis equipment - Specialized process industry applications #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 12Ni14 | Similar nickel steel grade | | **Europe** | **EN 10028-4** | 12Ni14 | Low temperature nickel steel | | **Japan** | **JIS G3127** | SL3N255 | Low temperature pressure vessel steel | | **Germany** | **DIN 17280** | 12Ni14 | Cryogenic nickel steel equivalent | **Grade B Class Mechanical Comparison:** | Parameter | Class 1 | Class 2 | Class 3 | |-----------|---------|---------|---------| | **Yield Strength Minimum** | 85 ksi | 95 ksi | 105 ksi | | **Tensile Strength Range** | 105-135 ksi | 115-145 ksi | 125-155 ksi | | **Impact Test Temperature** | -100°F | -100°F | -100°F | | **Typical Hardness Range** | 240-300 HBW | 260-320 HBW | 280-340 HBW | #### **6. Fabrication & Quality Assurance** **Advanced Welding Technology:** - **Pre-heat requirement**: 325-425°F (163-218°C) minimum - **Post-weld heat treatment**: Required at 1125-1225°F (607-663°C) - **Welding consumables**: Low-hydrogen electrodes with matching strength - **Interpass temperature control**: 425-575°F (218-302°C) maximum - **Advanced procedure qualification**: Mandatory for all welding operations **Precision Heat Treatment:** - **Austenitizing temperature**: 1550-1650°F (845-900°C) with strict control - **Quenching process**: Accelerated cooling with optimized rates - **Tempering range**: 1150-1350°F (621-732°C) for property development - **Microstructural verification**: Fully tempered martensitic/bainitic structure **Enhanced Quality Control:** - **Impact testing**: Required at -100°F (-73°C) for each heat treatment charge - **Tension tests**: Multiple locations and orientations - **Ultrasonic examination**: Per supplementary requirements when specified - **Hardness survey**: Typically 260-320 HBW --- **Technical Advantages:** - **Enhanced strength** with maintained low-temperature toughness - **Excellent cryogenic performance** for severe service conditions - **Superior hardenability** in heavy sections - **Good fabricability** despite increased strength levels **Design and Engineering Considerations:** - **ASME Section VIII Division 2** design methodology applicable - **Low-temperature service** capability maintained to -100°F (-73°C) - **Fracture mechanics assessment** recommended for critical applications - **Advanced NDE requirements** for quality verification **Service Limitations and Guidelines:** - **Minimum design temperature**: -100°F (-73°C) - **Maximum service temperature**: 750°F (400°C) - **Welding considerations**: Strict procedure control essential - **Quality verification**: Enhanced testing requirements for critical applications **Disclaimer:** This technical information is for reference purposes only. For pressure vessel applications involving cryogenic service, consult the latest ASTM A543 specification and applicable ASME Code requirements. Material selection, fabrication, and testing must be approved by qualified engineers and comply with all relevant regulatory standards and quality assurance protocols. -:- For detailed product information, please contact sales. -: ASTM A543 Low Alloy Steel, Grade B, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4454 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 A543 Low Alloy Steel, Grade B, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A543 Low Alloy Steel Foil, Grade B, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A543 Low Alloy Steel Foil, Grade B, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A543 Low Alloy Steel Foil/Strip, Grade B, Class 2 -:- 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 Foil/Strip 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 925 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