ASTM A542 Low Alloy Steel Wire, Grade B, Class 1

ASTM A542 Low Alloy Steel Wire, Grade B, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel Wire, Grade B, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A542 Low Alloy Steel, Grade B, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A542 Grade B Class 1: Elevated Temperature 2.25Cr-1Mo Steel Plate** #### **1. Overview** ASTM A542 Grade B Class 1 is a **quenched and tempered 2.25% chromium-1% molybdenum alloy steel plate** designed for **high-temperature pressure vessel applications** requiring enhanced resistance to hydrogen attack and superior creep strength. This specification represents a significant advancement over Grade A materials, offering improved performance in refinery hydroprocessing units, power generation equipment, and other demanding high-temperature services where long-term reliability under aggressive environments is essential. #### **2. Chemical Composition** The chemical composition is carefully balanced for optimal high-temperature performance: | 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) | 2.00 - 2.50 | | Molybdenum (Mo) | 0.90 - 1.10 | **Enhanced Composition Features:** - **Increased Chromium Content (2.00-2.50%)**: Provides superior oxidation and corrosion resistance - **Enhanced Molybdenum (0.90-1.10%)**: Delivers improved high-temperature strength and carbide stability - **Controlled Carbon Content**: Maintains weldability while ensuring adequate strength - **Balanced Manganese-Silicon**: Optimizes deoxidation and hardenability control #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 75 - 95 ksi (515 - 655 MPa) | | **Yield Strength** | 45 ksi min (310 MPa min) | | **Elongation in 2 inches** | 18% min | | **Reduction of Area** | 45% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -50°F (-46°C) | **Elevated Temperature Performance:** - **Excellent Creep Strength**: Outstanding performance at temperatures up to 1200°F (650°C) - **Superior Hydrogen Resistance**: Enhanced resistance to hydrogen attack per API 941 Nelson Curve - **Oxidation Resistance**: Suitable for continuous service in oxidizing atmospheres - **Thermal Stability**: Maintains microstructural integrity during long-term exposure **Physical Properties (Typical):** - **Density**: 0.282 lb/in³ (7,810 kg/m³) - **Modulus of Elasticity**: 29,500 ksi (203 GPa) at 70°F (21°C) - **Thermal Expansion Coefficient**: 6.2 × 10⁻⁶/°F (11.2 × 10⁻⁶/°C) from 70-1000°F - **Thermal Conductivity**: 25.0 W/m·K at 212°F (100°C) #### **4. Product Applications** Grade B Class 1 is specified for demanding high-temperature hydrogen service applications: **Petroleum Refining:** - Hydrocracking reactors - Hydrotreating vessels - Hydrogen reactors - High-pressure high-temperature process equipment **Power Generation:** - High-temperature steam drums - Power boiler components - High-pressure piping systems - Heat exchangers and superheaters **Chemical Processing:** - High-temperature reactors - Synthesis converters - Process vessels for corrosive service - High-pressure chemical equipment #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 10CrMo9-10 | Similar chromium-molybdenum steel | | **Europe** | **EN 10028-2** | 10CrMo9-10 | Close equivalent for pressure vessels | | **Japan** | **JIS G4109** | SCMV 4 | Chromium-molybdenum steel equivalent | | **Germany** | **DIN 17155** | 10CrMo910 | Historical designation | **Grade A vs Grade B Comparison:** | Parameter | Grade A | Grade B | |-----------|---------|---------| | **Chromium Content** | 1.00-1.50% | 2.00-2.50% | | **Molybdenum Content** | 0.45-0.60% | 0.90-1.10% | | **Maximum Service Temperature** | 1100°F (595°C) | 1200°F (650°C) | | **Hydrogen Service Capability** | Moderate | Enhanced | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heat requirement**: 300-400°F (150-200°C) minimum - **Post-weld heat treatment**: Mandatory at 1250-1350°F (675-730°C) - **Welding consumables**: Must match base metal composition - **Procedure qualification**: Essential for all welding operations **Heat Treatment Protocol:** - **Austenitizing**: 1650-1750°F (900-955°C) - **Quenching**: Accelerated cooling required - **Tempering**: 1250-1400°F (675-760°C) - **Microstructural requirements**: Fully tempered bainitic structure **Quality Control Requirements:** - **Impact testing**: Required at specified temperatures - **Tension tests**: From each heat treatment charge - **Ultrasonic examination**: Available as supplementary requirement - **Hardness testing**: Typically 180-220 HBW --- **Technical Advantages:** - **Enhanced high-temperature strength** - **Superior resistance to hydrogen attack** - **Excellent creep and rupture properties** - **Good oxidation and corrosion resistance** **Design Considerations:** - **ASME Section VIII Division 1** design rules applicable - **Creep life assessment** essential for high-temperature applications - **Hydrogen service evaluation** per API 941 requirements - **Environmental factors** affecting long-term performance **Service Limitations:** - **Maximum design temperature**: 1200°F (650°C) for continuous service - **Minimum design temperature**: -50°F (-46°C) based on impact requirements - **Hydrogen partial pressure limitations**: Per API 941 Nelson Curve - **Oxidation considerations**: Based on specific service environment **Disclaimer:** This information is for technical reference only. For high-temperature pressure vessel applications involving hydrogen service, consult the latest ASTM A542 specification and applicable ASME Code requirements. Material selection and fabrication must comply with API 941 recommendations and be approved by qualified engineers with experience in high-temperature hydrogen service applications. -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade B, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4442 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 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A542 Low Alloy Steel Wire, Grade B, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A542 Low Alloy Steel Wire, Grade B, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A542 Low Alloy Steel Wire, Grade B, Class 1 -:- 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 Wire 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 913 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