ASTM A542 Low Alloy Steel Rod/Bar, Grade A, Class 4

ASTM A542 Low Alloy Steel Rod, Grade A, Class 4 Product Information -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel Rod, Grade A, Class 4 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A542 Low Alloy Steel, Grade A, Class 4 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A542 Grade A Class 4: Ultra-High Strength Chromium-Molybdenum Steel Plate** #### **1. Overview** ASTM A542 Grade A Class 4 is a **premium ultra-high strength chromium-molybdenum alloy steel plate** that represents the highest performance tier within the ASTM A542 specification. This advanced material is supplied in the **quenched and tempered condition** and is specifically engineered for the most demanding pressure vessel applications where maximum strength retention at elevated temperatures is critical. Class 4 provides exceptional mechanical properties while maintaining sufficient toughness for service in extreme refinery, petrochemical, and power generation environments. #### **2. Chemical Composition** The chemical composition features enhanced control for superior performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P) | 0.020 max | | Phosphorus (P) | 0.020 max | | Sulfur (S) | 0.015 max | | Silicon (Si) | 0.15 - 0.40 | | Chromium (Cr) | 1.00 - 1.50 | | Molybdenum (Mo) | 0.45 - 0.60 | | Vanadium (V) | 0.03 max (optional) | **Premium Composition Features:** - **Ultra-Low Carbon (0.15% max)**: Ensures exceptional weldability despite ultra-high strength levels - **Enhanced Chromium-Molybdenum System**: Delivers superior high-temperature strength and microstructural stability - **Ultra-Low Impurity Levels**: Maximum 0.020% P and 0.015% S for premium toughness - **Optional Vanadium Addition**: Provides additional precipitation strengthening for specialized applications #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 105 - 125 ksi (725 - 860 MPa) | | **Yield Strength** | 80 ksi min (550 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) | **Elevated Temperature Capabilities:** - **Exceptional Creep Strength**: Outstanding resistance to deformation at temperatures up to 1150°F (620°C) - **Superior Oxidation Resistance**: Enhanced performance in aggressive high-temperature environments - **Excellent Thermal Fatigue Resistance**: Maintains integrity under severe thermal cycling conditions - **Microstructural Stability**: Premium resistance to temper embrittlement and microstructural degradation **Physical Properties (Typical):** - **Density**: 0.283 lb/in³ (7,835 kg/m³) - **Modulus of Elasticity**: 29,000 ksi (200 GPa) at 70°F (21°C) - **Mean Coefficient of Thermal Expansion**: 6.5 × 10⁻⁶/°F (11.7 × 10⁻⁶/°C) from 70-1000°F - **Thermal Conductivity**: 25.5 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 A Class 4 is reserved for the most critical high-temperature, high-pressure applications: **Advanced Petroleum Refining:** - Ultra-high pressure hydrocracking reactors - Severe service hydroprocessing units - Advanced refinery conversion systems - Critical high-pressure high-temperature separators **Power Generation Excellence:** - Advanced ultra-supercritical boiler components - High-pressure turbine casings and components - Critical power plant piping systems - Next-generation energy system pressure boundaries **Chemical Process Leadership:** - Severe service chemical synthesis reactors - High-pressure polymerization vessels - Advanced petrochemical processing equipment - Critical process industry pressure containment #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 13CrMo4-5 | Premium high-strength variant | | **Europe** | **EN 10028-2** | 13CrMo4-5 | Enhanced high-temperature properties | | **Japan** | **JIS G4109** | SCMV 4 | Ultra-high strength specialized grade | | **Germany** | **DIN 17155** | 13CrMo44 | Premium quality designation | **Complete Grade A Performance Spectrum:** | Parameter | Class 1 | Class 2 | Class 3 | Class 4 | |-----------|---------|---------|---------|---------| | **Yield Strength Minimum** | 50 ksi | 60 ksi | 70 ksi | 80 ksi | | **Tensile Strength Range** | 75-95 ksi | 85-105 ksi | 95-115 ksi | 105-125 ksi | | **Impact Energy** | 40 ft-lb | 35 ft-lb | 30 ft-lb | 25 ft-lb | #### **6. Fabrication & Quality Excellence** **Advanced Welding Technology:** - **Critical pre-heat control**: 425-525°F (218-274°C) minimum - **Precision interpass management**: 475-575°F (246-302°C) maximum - **Optimized PWHT**: 1200-1300°F (649-704°C) with strict control - **Premium welding consumables**: Specially formulated for ultra-high strength applications - **Advanced procedure qualification**: Essential for all fabrication activities **State-of-the-Art Heat Treatment:** - **Precision austenitizing**: 1650-1700°F (899-927°C) with advanced control systems - **Advanced quenching technology**: Optimized cooling rate management - **Multiple-stage tempering**: 1250-1400°F (677-760°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 chromium-molybdenum 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**: 1150°F (621°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 A Class 4. For ultra-critical pressure vessel applications, 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 rigorous quality assurance protocols and regulatory oversight. -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade A, Class 4 Specification Dimensions Size： Diameter 20-1000 mm Length <4440 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 4 Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A542 Low Alloy Steel Rod, Grade A, 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 Rod 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 911 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