ASTM A542 Low Alloy Steel Sheet,Plate, Grade B, Class 4

ASTM A542 Low Alloy Steel Sheet/Plate, Grade B, Class 4 Product Information -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel Sheet/Plate, Grade B, Class 4 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A542 Low Alloy Steel, Grade B, Class 4 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A542 Grade B Class 4: Premium High-Temperature 2.25Cr-1Mo Steel Plate** #### **1. Overview** ASTM A542 Grade B Class 4 is a **premium-grade quenched and tempered 2.25% chromium-1% molybdenum alloy steel plate** that represents the highest performance category within the ASTM A542 specification. This advanced material is engineered for **ultra-severe service applications** where maximum strength, exceptional creep resistance, and superior hydrogen attack resistance are required simultaneously. Class 4 is specifically designed for heavy-wall pressure vessels operating at extreme temperatures and pressures in advanced refining, petrochemical, and power generation applications. #### **2. Chemical Composition** The chemical composition features enhanced controls for premium performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P) | 0.015 max | | Sulfur (S) | 0.010 max | | Silicon (Si) | 0.15 - 0.40 | | Chromium (Cr) | 2.00 - 2.50 | | Molybdenum (Mo) | 0.90 - 1.10 | | Vanadium (V) | 0.03 - 0.10 (enhanced) | | Nickel (Ni) | 0.25 max (optional) | **Premium Composition Features:** - **Enhanced Chromium-Molybdenum System**: Optimal balance for maximum high-temperature performance - **Vanadium Addition (0.03-0.10%)**: Provides secondary precipitation strengthening - **Ultra-Low Impurity Control**: Maximum 0.015% P and 0.010% S for superior fracture toughness - **Optional Nickel Content**: Improves toughness properties without compromising strength - **Advanced Cleanliness**: Superior steelmaking practices for enhanced reliability #### **3. Physical & Mechanical Properties** **Mechanical Properties (Advanced Q&T Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 105 - 125 ksi (725 - 860 MPa) | | **Yield Strength** | 75 ksi min (515 MPa min) | | **Elongation in 2 inches** | 15% min | | **Reduction of Area** | 35% min | | **Charpy V-Notch Impact** | 25 ft-lb min at -50°F (-46°C) | **Ultra-High Temperature Performance:** - **Exceptional Creep Rupture Strength**: Premium performance at temperatures up to 1250°F (675°C) - **Superior Hydrogen Resistance**: Enhanced capability for ultra-high pressure hydrogen service - **Advanced Oxidation Resistance**: Exceptional performance in aggressive high-temperature environments - **Microstructural Stability**: Superior resistance to long-term thermal degradation **Physical Properties (Typical):** - **Density**: 0.282 lb/in³ (7,810 kg/m³) - **Modulus of Elasticity**: 28,800 ksi (199 GPa) at 70°F (21°C) - **Thermal Expansion Coefficient**: 6.5 × 10⁻⁶/°F (11.7 × 10⁻⁶/°C) from 70-1000°F - **Thermal Conductivity**: 23.5 W/m·K at 212°F (100°C) - **Specific Heat**: 0.11 Btu/lb·°F (460 J/kg·K) at 212°F #### **4. Product Applications** Grade B Class 4 is reserved for the most demanding high-temperature, high-pressure applications: **Advanced Refining Technology:** - Ultra-heavy wall hydrocracking reactors - Advanced hydroprocessing units - High-pressure hydrogen vessels - Next-generation refinery conversion systems **Power Generation Leadership:** - Ultra-supercritical boiler components - Advanced steam turbine systems - High-efficiency heat exchangers - Next-generation power plant pressure boundaries **Chemical Process Innovation:** - Severe service chemical synthesis reactors - High-pressure polymerization vessels - Advanced petrochemical processing equipment - Critical process industry applications #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 10CrMo9-10 | Premium high-strength variant | | **Europe** | **EN 10028-2** | 10CrMo9-10 | Enhanced high-temperature properties | | **Japan** | **JIS G4109** | SCMV 4 | Specialized high-strength grade | | **Germany** | **DIN 17155** | 10CrMo910 | Premium quality designation | **Complete Grade B Performance Hierarchy:** | Parameter | Class 1 | Class 2 | Class 3 | Class 4 | |-----------|---------|---------|---------|---------| | **Yield Strength Minimum** | 45 ksi | 55 ksi | 65 ksi | 75 ksi | | **Tensile Strength Range** | 75-95 ksi | 85-105 ksi | 95-115 ksi | 105-125 ksi | | **Application Focus** | Standard | Intermediate | High Strength | Ultra-High Strength | #### **6. Fabrication & Quality Excellence** **Advanced Welding Technology:** - **Critical pre-heat protocol**: 425-525°F (218-274°C) minimum - **Precision interpass control**: 475-575°F (246-302°C) maximum - **Optimized PWHT**: 1325-1425°F (718-774°C) with advanced control - **Premium welding consumables**: Specially formulated for ultra-high strength applications - **Advanced NDE requirements**: 100% volumetric examination mandatory **State-of-the-Art Heat Treatment:** - **Precision austenitizing**: 1650-1750°F (900-955°C) with advanced atmosphere control - **Enhanced quenching technology**: Optimized cooling rate management - **Multiple-stage tempering**: 1325-1475°F (718-802°C) for property optimization - **Real-time process monitoring**: Comprehensive digital verification and documentation **Uncompromising Quality Assurance:** - **Advanced ultrasonic examination**: Phased array or TOFD methods per ASTM A578 Level III - **Comprehensive mechanical testing**: Including advanced fracture mechanics characterization - **Metallurgical verification**: Sophisticated microstructural and inclusion analysis - **Complete digital traceability**: Blockchain-enabled documentation systems --- **Breakthrough Technical Advantages:** - **Ultimate strength capability** within 2.25Cr-1Mo steel family - **Exceptional high-temperature performance** in severe service conditions - **Superior resistance to environmental degradation** - **Premium quality and consistency** for critical applications **Engineering Excellence Requirements:** - **Advanced ASME Section VIII Division 2** design methodology - **Sophisticated creep and rupture analysis** for extended service life - **Comprehensive fracture mechanics evaluation** using latest methodologies - **State-of-the-art fatigue analysis** for cyclic service conditions **Service Performance Guidelines:** - **Maximum design temperature**: 1250°F (677°C) for continuous service - **Minimum design temperature**: -50°F (-46°C) based on impact requirements - **Hydrogen service compliance**: Strict adherence to API 941 Nelson Curve criteria - **Oxidation performance**: Premium resistance in aggressive environments **Disclaimer:** This information represents the highest standard of technical reference for ASTM A542 Grade B Class 4. For ultra-critical pressure vessel applications involving extreme temperature and pressure conditions, absolute adherence to the latest ASTM specifications and applicable ASME Code requirements is mandatory. All design, material selection, fabrication, and testing activities must be directed by exceptionally qualified engineers and subject to the most rigorous quality assurance protocols and regulatory oversight. -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade B, Class 4 Specification Dimensions Size： Diameter 20-1000 mm Length <4445 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 B, Class 4 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A542 Low Alloy Steel Sheet,Plate, Grade B, Class 4 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A542 Low Alloy Steel Sheet,Plate, Grade B, Class 4 -:- For detailed product information, please contact sales. -:

Packing of ASTM A542 Low Alloy Steel Sheet/Plate, Grade B, Class 4 -:- 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 Sheet/Plate 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 916 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