ASTM A542 Low Alloy Steel, Grade A, Class 3

ASTM A542 Low Alloy Steel, Grade A, Class 3 Product Information -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade A, Class 3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A542 Low Alloy Steel, Grade A, Class 3 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A542 Grade A Class 3: High-Strength Chromium-Molybdenum Steel Plate** #### **1. Overview** ASTM A542 Grade A Class 3 is a **high-strength chromium-molybdenum alloy steel plate** supplied in the **quenched and tempered condition** for pressure vessel applications requiring maximum strength retention at elevated temperatures. This class represents the highest strength level within the Grade A classification, providing superior mechanical properties while maintaining adequate toughness for high-temperature service in demanding refinery and power generation applications. #### **2. Chemical Composition** The chemical composition is precisely controlled to achieve maximum strength capabilities: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P) | 0.025 max | | Sulfur (S) | 0.025 max | | Silicon (Si) | 0.15 - 0.40 | | Chromium (Cr) | 1.00 - 1.50 | | Molybdenum (Mo) | 0.45 - 0.60 | **Advanced Composition Features:** - **Ultra-Low Carbon Content**: Maximizes weldability and toughness at high strength levels - **Optimized Chromium-Molybdenum Ratio**: Provides excellent high-temperature strength and oxidation resistance - **Tight Compositional Control**: Ensures consistent heat treatment response - **Enhanced Purity Levels**: Superior cleanliness for improved fracture resistance #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 95 - 115 ksi (655 - 795 MPa) | | **Yield Strength** | 70 ksi min (485 MPa min) | | **Elongation in 2 inches** | 16% min | | **Reduction of Area** | 35% min | | **Charpy V-Notch Impact** | 30 ft-lb min at -50°F (-46°C) | **High-Temperature Performance:** - **Enhanced Creep Strength**: Superior resistance to deformation at temperatures up to 1100°F (595°C) - **Oxidation Resistance**: Maintains integrity in oxidizing atmospheres - **Thermal Stability**: Excellent microstructural stability during prolonged high-temperature exposure **Physical Properties (Typical):** - **Density**: 0.283 lb/in³ (7,830 kg/m³) - **Modulus of Elasticity**: 29,100 ksi (201 GPa) at room temperature - **Thermal Expansion Coefficient**: 6.4 × 10⁻⁶/°F (11.5 × 10⁻⁶/°C) from 70-1000°F - **Thermal Conductivity**: 26.0 W/m·K at 212°F (100°C) #### **4. Product Applications** Grade A Class 3 is specified for the most demanding high-temperature, high-pressure applications: **Petroleum Refining:** - High-pressure hydrocracking reactors - Severe service hydrotreating vessels - Critical refinery process equipment - High-temperature high-pressure separators **Power Generation:** - High-pressure steam drums and headers - Advanced boiler components - Critical power plant piping systems - High-temperature heat exchangers **Chemical Processing:** - Severe service chemical reactors - High-pressure synthesis vessels - Demanding process industry equipment - Advanced petrochemical units #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 13CrMo4-5 | High-strength variant | | **Europe** | **EN 10028-2** | 13CrMo4-5 | Similar elevated temperature properties | | **Japan** | **JIS G4109** | SCMV 4 | High-strength chromium-molybdenum steel | | **Germany** | **DIN 17155** | 13CrMo44 | Well-established equivalent | **Complete Grade A Property Comparison:** | Parameter | Class 1 | Class 2 | Class 3 | |-----------|---------|---------|---------| | **Yield Strength Minimum** | 50 ksi | 60 ksi | 70 ksi | | **Tensile Strength Range** | 75-95 ksi | 85-105 ksi | 95-115 ksi | | **Impact Energy Requirement** | 40 ft-lb | 35 ft-lb | 30 ft-lb | #### **6. Fabrication & Quality Assurance** **Advanced Welding Technology:** - **Strict pre-heat requirements**: 400-500°F (200-260°C) minimum - **Precise interpass control**: 450-550°F (230-290°C) maximum - **Post-weld heat treatment**: Mandatory at 1175-1275°F (635-690°C) - **Specialized welding consumables**: High-strength matching composition required **Precision Heat Treatment:** - **Austenitizing**: 1650-1700°F (900-925°C) with strict uniformity - **Quenching**: Accelerated cooling with precise rate control - **Tempering**: 1225-1375°F (665-745°C) for optimal property development - **Quality verification**: Comprehensive mechanical testing required **Enhanced Quality Control:** - **Ultrasonic examination**: Per ASTM A578 Level II minimum - **Impact testing**: Multiple locations and orientations - **Tensile testing**: Longitudinal and transverse directions - **Hardness survey**: Typically 225-275 HBW --- **Technical Advantages:** - **Maximum strength capability** within Grade A classification - **Excellent high-temperature mechanical properties** - **Good resistance to hydrogen environment embrittlement** - **Superior creep rupture strength** **Design and Engineering Considerations:** - **ASME Section VIII Division 2** design methods recommended - **Advanced creep analysis** required for high-temperature applications - **Fracture mechanics evaluation** for critical service conditions - **Environmental degradation assessment** essential **Service Limitations and Guidelines:** - **Maximum continuous service temperature**: 1100°F (595°C) - **Minimum design temperature**: -50°F (-46°C) - **Hydrogen service**: Per API 941 Nelson Curve requirements - **Oxidation limits**: Dependent on specific service environment **Disclaimer:** This information is for technical reference purposes. For high-temperature pressure vessel applications, strict adherence to the latest ASTM A542 specification and applicable ASME Code requirements is mandatory. All design, material selection, and fabrication activities must be approved by qualified engineers and comply with relevant regulatory standards and quality assurance protocols. -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade A, Class 3 Specification Dimensions Size： Diameter 20-1000 mm Length <4439 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 A542 Low Alloy Steel, Grade A, Class 3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A542 Low Alloy Steel, Grade A, Class 3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A542 Low Alloy Steel, Grade A, Class 3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A542 Low Alloy Steel, Grade A, Class 3 -:- 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 910 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