ASTM A533 Low Alloy Steel, Grade B, Class 2

ASTM A533 Low Alloy Steel, Grade B, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel, Grade B, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A533 Low Alloy Steel, Grade B, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A533 Grade B Class 2: High-Strength Nickel-Alloy Steel Plate** #### **1. Overview** ASTM A533 Grade B Class 2 is a **medium-strength, high-toughness** quenched and tempered alloy steel plate within the ASTM A533 specification. Characterized by its **balanced combination of strength and toughness**, this class builds upon the enhanced nickel content of Grade B to provide reliable performance in critical pressure vessel applications, particularly where **low-temperature service** and **heavy sections** are design considerations. #### **2. Chemical Composition** The chemical composition is optimized for deep hardenability and superior toughness: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.25 max | | Manganese (Mn) | 1.15 - 1.50 | | Phosphorus (P) | 0.025 max | | Sulfur (S) | 0.025 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 2.00 - 2.50 | | Molybdenum (Mo) | 0.45 - 0.60 | | Copper (Cu) | 0.25 max | **Enhanced Composition Features:** - **Higher Nickel (2.00-2.50%)**: Provides exceptional low-temperature toughness - **Tighter Sulfur Control**: Improved through-thickness properties - **Elevated Manganese**: Ensures adequate hardenability in thick sections - **Lower Impurities**: Enhanced cleanliness for critical applications #### **3. Physical & Mechanical Properties** **Mechanical Properties (Up to 2½ inches / 63 mm thickness):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 90 - 110 ksi (620 - 760 MPa) | | **Yield Strength** | 70 ksi min (485 MPa min) | | **Elongation in 2 inches** | 16% min | | **Reduction of Area** | 40% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -75°F (-60°C) | **Thickness Capability and Property Adjustment:** - Maximum thickness: 14 inches (355 mm) - For thickness 2½-4 inches: Yield strength min 65 ksi (450 MPa) - For thickness 4-6 inches: Yield strength min 60 ksi (415 MPa) - Excellent property retention in heavy sections **Physical Properties (Typical):** - **Density:** 0.284 lb/in³ (7,850 kg/m³) - **Modulus of Elasticity:** 29,000 ksi (200 GPa) - **Thermal Expansion Coefficient:** 6.2 × 10⁻⁶/°F (11.2 × 10⁻⁶/°C) - **Poisson's Ratio:** 0.29 #### **4. Product Applications** Grade B Class 2 is specified for applications requiring both strength and exceptional toughness: **Nuclear Power Systems:** - Reactor pressure vessel circumferential shells - Closure flange components - Steam generator supports - Nuclear primary circuit components **Low-Temperature Equipment:** - LNG storage tank inner containers - Cryogenic process vessels - Low-temperature heat exchangers - Arctic service pressure vessels **Petrochemical Applications:** - Heavy-wall hydrogen reactors - High-pressure synthesis converters - Critical refinery components - High-pressure gas storage systems #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 12Ni19 | Similar nickel content and properties | | **Europe** | **EN 10028-2** | 12Ni19 | Close mechanical equivalent | | **Japan** | **JIS G3120** | SOV 4A | Comparable nuclear quality | | **Germany** | **DIN 17155** | 12Ni19 | Historical designation | **Grade B Class Comparison:** | Parameter | Class 1 | Class 2 | Class 3 | |-----------|---------|---------|---------| | **Yield Strength Min** | 50 ksi | 70 ksi | 85 ksi | | **Tensile Range** | 80-100 ksi | 90-110 ksi | 100-115 ksi | | **Primary Application** | High toughness | Balanced properties | Maximum strength | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heating:** 300-400°F (150-200°C) minimum - **Interpass temperature:** 400-600°F (200-315°C) maximum - **Post-weld heat treatment:** 1100-1150°F (595-620°C) - **Welding consumables:** Nickel-modified to match base metal toughness **Heat Treatment Parameters:** - **Austenitizing:** 1600-1650°F (870-900°C) - **Quenching:** Controlled cooling rate critical - **Tempering:** 1150-1250°F (620-675°C) - **Quality verification:** Hardness and impact testing required **Quality Control Requirements:** - **Ultrasonic examination:** Per ASTM A578 Level II minimum - **Impact testing:** Multiple locations and orientations - **Tensile testing:** Longitudinal and transverse specimens - **Chemical analysis:** Ladle and product analysis verification --- **Key Technical Advantages:** - **Excellent balance** of strength and toughness - **Superior low-temperature impact properties** - **Good resistance to neutron irradiation embrittlement** - **Consistent performance** in heavy sections **Design and Application Notes:** - Suitable for **ASME Section III** nuclear applications - Requires **fracture mechanics analysis** for critical service - **Radiation surveillance programs** recommended for nuclear use - **Periodic in-service inspection** required for continued operation **Disclaimer:** This information is for technical reference only. For nuclear and other critical applications, consult the latest ASTM A533 specification and applicable construction codes. All material selection and fabrication activities must comply with relevant regulatory requirements and be supervised by qualified engineers. -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel, Grade B, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4427 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 A533 Low Alloy Steel, Grade B, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A533 Low Alloy Steel, Grade B, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A533 Low Alloy Steel, Grade B, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A533 Low Alloy Steel, 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 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 898 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