ASTM A533 Low Alloy Steel, Grade A, Class 2

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

ASTM A533 Low Alloy Steel, Grade A, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A533 Grade A Class 2: High-Strength Quenched and Tempered Alloy Steel Plate** #### **1. Overview** ASTM A533 Grade A Class 2 is a high-strength, quenched and tempered alloy steel plate within the ASTM A533 specification, specifically designed for **heavy-section pressure vessel applications** requiring superior toughness. This class offers **enhanced strength** compared to Class 1 while maintaining excellent toughness properties, making it suitable for critical applications where both high strength and fracture resistance are paramount. #### **2. Chemical Composition** The chemical composition is identical to Grade A Class 1, carefully balanced for optimal hardenability in thick sections: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.25 max | | Manganese (Mn) | 0.95 - 1.30 | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 0.70 - 1.00 | | Molybdenum (Mo) | 0.45 - 0.60 | **Microstructural Characteristics:** - **Fine-grained practice** required - **Austenitic grain size:** 5 or finer - **Heat treatment:** Quenched and tempered condition #### **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 Limitations:** - Maximum thickness: 12 inches (305 mm) - Mechanical properties vary with section size - Thicker sections may require modified heat treatment **Physical Properties (Typical):** - **Density:** 0.284 lb/in³ (7,850 kg/m³) - **Modulus of Elasticity:** 29,000 ksi (200 GPa) - **Thermal Conductivity:** 28.5 W/m·K at 100°C - **Specific Heat:** 450 J/kg·K at 100°C #### **4. Product Applications** ASTM A533 Grade A Class 2 is utilized in extremely demanding applications where both strength and toughness are critical: **Nuclear Power Components:** - Reactor pressure vessels (heavy-wall sections) - Nuclear steam supply system components - Pressurizers and steam generators - Primary circuit containment structures **High-Pressure Vessels:** - Hydrocracking reactors - Ammonia converters - Methanol synthesis reactors - High-pressure gas storage vessels **Special Applications:** - Heavy-wall chemical process reactors - Offshore platform components - Critical structural supports in aggressive environments #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 13MnNiMo5-5 | Similar strength level | | **Europe** | **EN 10028-2** | 13MnNiMo5-5 | Close mechanical properties | | **Japan** | **JIS G3120** | SOV 2B | Comparable nuclear grade | | **Germany** | **SEP 1380** | 13MnNiMo54 | Similar application scope | **Technical Comparison with Class 1:** | Parameter | Class 1 | Class 2 | |-----------|---------|---------| | **Yield Strength** | 50 ksi min | 70 ksi min | | **Tensile Strength** | 80-100 ksi | 90-110 ksi | | **Application Focus** | General pressure vessels | Heavy-section nuclear vessels | #### **6. Fabrication & Quality Assurance** **Welding Considerations:** - **Pre-heat temperature:** 300-400°F (150-200°C) - **Post-weld heat treatment:** 1100-1150°F (595-620°C) - **Welding processes:** SMAW, SAW, GTAW with low-hydrogen electrodes - **Welder qualification:** Per ASME Section IX requirements **Quality Control Requirements:** - **Ultrasonic testing:** Per ASTM A578 Level II or higher - **Impact testing:** Multiple locations for thick sections - **Tension tests:** From each end of thick plates - **Heat treatment records:** Complete documentation required **Special Nuclear Requirements:** - **Supplementary requirements:** S1 to S18 as specified - **Fabrication procedures:** Per ASME Section III - **Material traceability:** Complete from melt to final product --- **Key Advantages:** - **Superior strength-to-toughness ratio** in heavy sections - **Excellent radiation resistance** for nuclear applications - **Proven performance** in critical service conditions - **Well-established fabrication guidelines** **Design Considerations:** - Section size effects on mechanical properties - Proper heat treatment cycle control - Weld procedure qualification for specific applications - Non-destructive examination requirements **Disclaimer:** This information is for reference purposes. For nuclear applications, consult ASME Section III and applicable nuclear regulatory requirements. Material selection should be verified by qualified engineers for specific applications. -:- For detailed product information, please contact sales. -: ASTM A533 Low Alloy Steel, Grade A, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4424 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 A, Class 2 Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A533 Low Alloy Steel, Grade A, 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 895 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