ASTM A543 Low Alloy Steel, Grade B, Class 1

ASTM A543 Low Alloy Steel, Grade B, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A543 Low Alloy Steel, Grade B, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A543 Low Alloy Steel, Grade B, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A543 Grade B Class 1: Nickel-Chromium-Molybdenum Alloy Steel Plate** #### **1. Overview** ASTM A543 Grade B Class 1 is a **high-strength nickel-chromium-molybdenum alloy steel plate** supplied in the **quenched and tempered condition**. This specification covers steel plates primarily designed for **pressure vessel applications** requiring exceptional notch toughness at low temperatures, combined with high strength and good weldability. The unique alloy composition provides superior performance in cryogenic and low-temperature service conditions. #### **2. Chemical Composition** The chemical composition is precisely controlled for optimal 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 | **Key Composition Features:** - **High Nickel Content (2.00-3.50%)**: Provides exceptional low-temperature toughness - **Chromium-Molybdenum Combination**: Enhances hardenability and strength properties - **Controlled Carbon Content**: Ensures good weldability while maintaining strength - **Low Manganese Range**: Optimized for specific hardenability and toughness requirements #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 105 - 135 ksi (725 - 930 MPa) | | **Yield Strength** | 85 ksi min (585 MPa min) | | **Elongation in 2 inches** | 16% min | | **Reduction of Area** | 40% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -100°F (-73°C) | **Enhanced Performance Characteristics:** - **Exceptional Low-Temperature Toughness**: Maintains high impact values at cryogenic temperatures - **Excellent Fracture Resistance**: Superior performance in low-temperature applications - **Good Hardenability**: Consistent mechanical properties in thick sections - **Stable Microstructure**: Reliable performance under thermal cycling conditions **Physical Properties (Typical):** - **Density**: 0.285 lb/in³ (7,890 kg/m³) - **Modulus of Elasticity**: 29,000 ksi (200 GPa) - **Thermal Expansion Coefficient**: 6.4 × 10⁻⁶/°F (11.5 × 10⁻⁶/°C) - **Thermal Conductivity**: 26.5 W/m·K at 212°F (100°C) - **Poisson's Ratio**: 0.29 #### **4. Product Applications** Grade B Class 1 is specified for demanding low-temperature and high-pressure applications: **Cryogenic and Low-Temperature Service:** - LNG storage and processing vessels - Cryogenic storage tanks - Low-temperature pressure vessels - Cryogenic transport containers **Power Generation Equipment:** - Nuclear reactor components - High-pressure turbine parts - Power plant pressure vessels - Energy storage system components **Chemical and Process Industry:** - High-pressure chemical reactors - Petrochemical process vessels - Synthesis gas equipment - Low-temperature process units #### **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 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 | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication Requirements:** - **Pre-heat requirement**: 300-400°F (150-200°C) minimum - **Post-weld heat treatment**: Recommended at 1100-1200°F (595-650°C) - **Welding consumables**: Low-hydrogen electrodes mandatory - **Interpass temperature control**: 400-600°F (200-315°C) maximum - **Procedure qualification**: Essential for all welding operations **Heat Treatment Protocol:** - **Austenitizing temperature**: 1550-1650°F (845-900°C) - **Quenching process**: Accelerated cooling required - **Tempering range**: 1100-1300°F (595-705°C) - **Microstructural requirements**: Fully tempered microstructure **Quality Control and Testing:** - **Impact testing**: Required at -100°F (-73°C) for each heat treatment charge - **Tension tests**: From representative locations of each plate - **Ultrasonic examination**: Available as supplementary requirement - **Hardness verification**: Typically 240-300 HBW --- **Technical Advantages:** - **Excellent low-temperature toughness** down to cryogenic temperatures - **High strength-to-weight ratio** - **Good weldability and formability** - **Superior hardenability** in thick sections **Design and Application Considerations:** - **ASME Section VIII** design rules applicable - **Low-temperature service** capability to -100°F (-73°C) - **Fracture mechanics analysis** recommended for critical applications - **Environmental factors** consideration for specific service conditions **Service Limitations and Guidelines:** - **Minimum design temperature**: -100°F (-73°C) - **Maximum service temperature**: 800°F (425°C) - **Corrosion considerations**: Protection may be required in aggressive environments - **Fabrication requirements**: Strict control of welding and heat treatment processes **Disclaimer:** This technical information is for reference purposes only. For pressure vessel applications, consult the latest ASTM A543 specification and applicable ASME Code requirements. Material selection and fabrication must be approved by qualified engineers and comply with all relevant regulatory standards and quality assurance protocols. Actual properties may vary depending on manufacturing processes and heat treatment parameters. -:- For detailed product information, please contact sales. -: ASTM A543 Low Alloy Steel, Grade B, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4453 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 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A543 Low Alloy Steel, Grade B, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A543 Low Alloy Steel, Grade B, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A543 Low Alloy Steel, Grade B, Class 1 -:- 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 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 924 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