ASTM A542 Low Alloy Steel Capillary, Grade C, Class 2

ASTM A542 Low Alloy Steel Capillary, Grade C, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel Capillary, Grade C, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A542 Low Alloy Steel, Grade C, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A542 Grade C Class 2: High-Strength 3Cr-1Mo Steel Plate** #### **1. Overview** ASTM A542 Grade C Class 2 is a **medium-strength quenched and tempered 3% chromium-1% molybdenum alloy steel plate** that provides an optimal balance of high-temperature strength, creep resistance, and hydrogen attack resistance. This intermediate class within the Grade C classification offers enhanced mechanical properties compared to Class 1, making it particularly suitable for heavy-wall pressure vessels operating under severe temperature and pressure conditions in modern refining and petrochemical industries. #### **2. Chemical Composition** The chemical composition maintains precise control for superior high-temperature performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P) | 0.020 max | | Sulfur (S) | 0.015 max | | Silicon (Si) | 0.15 - 0.40 | | Chromium (Cr) | 2.75 - 3.25 | | Molybdenum (Mo) | 0.90 - 1.10 | | Vanadium (V) | 0.03 max (optional) | **Enhanced Composition Features:** - **Higher Chromium Content (2.75-3.25%)**: Delivers superior oxidation and sulfidation resistance - **Optimized Molybdenum (0.90-1.10%)**: Ensures excellent high-temperature strength and microstructural stability - **Tighter Impurity Control**: Maximum 0.020% P and 0.015% S for improved fracture toughness - **Optional Vanadium Addition**: Provides additional precipitation strengthening - **Controlled Carbon Content**: Maintains optimal weldability and toughness balance #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 85 - 105 ksi (585 - 725 MPa) | | **Yield Strength** | 55 ksi min (380 MPa min) | | **Elongation in 2 inches** | 17% min | | **Reduction of Area** | 40% min | | **Charpy V-Notch Impact** | 35 ft-lb min at -50°F (-46°C) | **Enhanced Elevated Temperature Performance:** - **Superior Creep Strength**: Excellent long-term performance at temperatures up to 1250°F (675°C) - **Enhanced Hydrogen Resistance**: Meets API 941 Nelson Curve requirements for severe hydrogen service - **Advanced Oxidation Resistance**: Maintains integrity in aggressive high-temperature environments - **Thermal Stability**: Premium resistance to temper embrittlement and microstructural degradation **Physical Properties (Typical):** - **Density**: 0.281 lb/in³ (7,780 kg/m³) - **Modulus of Elasticity**: 29,300 ksi (202 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**: 24.0 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 C Class 2 is specified for demanding high-temperature, high-pressure applications: **Advanced Petroleum Refining:** - Heavy-wall hydrocracking reactors - High-pressure hydrotreating vessels - Severe service hydrogen reactors - Advanced refinery conversion systems **Power Generation Excellence:** - High-temperature steam drums and headers - Critical power boiler components - Advanced heat exchanger systems - High-efficiency power plant applications **Chemical Process Innovation:** - Severe service chemical reactors - High-pressure synthesis converters - Advanced petrochemical equipment - Critical process industry vessels #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 12CrMo9-10 | Enhanced high-temperature variant | | **Europe** | **EN 10028-2** | 12CrMo9-10 | Comparable elevated temperature properties | | **Japan** | **JIS G4109** | SCMV 4 | High-performance chromium-molybdenum steel | | **Germany** | **DIN 17155** | 12CrMo910 | Premium quality designation | **Grade C Class Comparison:** | Parameter | Class 1 | Class 2 | Class 3 | |-----------|---------|---------|---------| | **Yield Strength Minimum** | 45 ksi | 55 ksi | 65 ksi | | **Tensile Strength Range** | 75-95 ksi | 85-105 ksi | 95-115 ksi | | **Application Temperature Range** | Standard | Intermediate | High | #### **6. Fabrication & Quality Assurance** **Advanced Welding Technology:** - **Pre-heat requirement**: 350-450°F (175-230°C) depending on thickness - **Post-weld heat treatment**: Mandatory at 1325-1425°F (718-774°C) - **Welding consumables**: Low-hydrogen electrodes with matching composition - **Interpass temperature control**: 400-600°F (200-315°C) maximum - **Advanced procedure qualification**: Essential for critical applications **Precision Heat Treatment:** - **Austenitizing temperature**: 1650-1750°F (900-955°C) with strict control - **Quenching process**: Accelerated cooling with optimized rate management - **Tempering range**: 1325-1475°F (718-802°C) for property development - **Microstructural verification**: Fully tempered bainitic structure required **Enhanced Quality Control:** - **Impact testing**: At specified temperature for each heat treatment charge - **Tension tests**: Multiple locations and orientations - **Hardness verification**: Typically 200-240 HBW - **Ultrasonic examination**: Per ASTM A578 Level II minimum --- **Technical Advantages:** - **Enhanced high-temperature mechanical properties** - **Superior resistance to hydrogen environment embrittlement** - **Excellent creep rupture strength** for extended service life - **Advanced oxidation and corrosion resistance** **Design and Engineering Considerations:** - **ASME Section VIII Division 2** design methodology recommended - **Comprehensive creep analysis** for high-temperature applications - **Fracture mechanics evaluation** for critical service conditions - **Environmental degradation assessment** essential **Service Limitations and Guidelines:** - **Maximum design temperature**: 1250°F (675°C) for continuous service - **Minimum design temperature**: -50°F (-46°C) based on impact requirements - **Hydrogen service**: Strict adherence to API 941 Nelson Curve requirements - **Oxidation performance**: Dependent on specific service environment **Disclaimer:** This technical information represents advanced reference material for ASTM A542 Grade C Class 2. For ultra-critical pressure vessel applications involving high-temperature hydrogen service, absolute adherence to the latest ASTM specifications and applicable ASME Code requirements is mandatory. All design, material selection, and fabrication activities must be approved by qualified engineers and comply with API 941 recommendations and rigorous quality assurance protocols. -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade C, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4448 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 C, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A542 Low Alloy Steel Capillary, Grade C, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A542 Low Alloy Steel Capillary, Grade C, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A542 Low Alloy Steel Capillary, Grade C, 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 Capillary 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 919 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