ASTM A387 Alloy Steel Wire, Grade 5, Class 2

ASTM A387 Alloy Steel Wire, Grade 5, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Wire, Grade 5, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 5, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 5 Class 2 Steel** **ASTM A387 Grade 5 Class 2** is a chromium-molybdenum alloy steel plate supplied in the normalized and tempered condition, offering enhanced mechanical properties for pressure vessel applications requiring superior high-temperature strength and corrosion resistance. This class provides improved strength characteristics compared to Class 1 while maintaining excellent elevated temperature performance. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A387/A387M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum" **Grade Classification:** - **Grade 5** - 5.0% Chromium - 0.5% Molybdenum alloy steel - **Class 2** - Normalized and tempered condition **International Equivalents:** - **EN 10028-2**: X12CrMo5 - **JIS G4109**: SCMV 8 - **GB/T 3077**: 45Cr5MoSiV1 - **ISO 9328-2**: X12CrMo5 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A387 Grade 5 Class 2: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.15 | | Manganese (Mn) | 0.30-0.60 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.50 | | Chromium (Cr) | 4.00-6.00 | | Molybdenum (Mo) | 0.45-0.65 | **Key Composition Features:** - **Enhanced Chromium**: 4.00-6.00% for superior oxidation and corrosion resistance - **Optimized Molybdenum**: 0.45-0.65% for improved creep strength and temper resistance - **Precise Carbon Control**: Maximum 0.15% for optimal strength-toughness balance - **Restricted Manganese**: 0.30-0.60% for better high-temperature stability --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Class 2 condition):** | Property | Value | |---|---| | **Tensile Strength** | 585-760 MPa (85-110 ksi) | | **Yield Strength (min.)** | 415 MPa (60 ksi) | | **Elongation in 2" (min.)** | 16% | | **Elongation in 8" (min.)** | 18% | **Enhanced Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 650°C (1200°F) - **Creep Rupture Strength**: Superior long-term performance under sustained loading - **Oxidation Resistance**: Excellent in high-temperature oxidizing atmospheres - **Sulfidation Resistance**: Outstanding performance in sulfur-containing environments **Physical Properties:** - **Density**: 7.80 g/cm³ (0.282 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 35.5 W/m·K - **Coefficient of Thermal Expansion**: 11.1 × 10⁻⁶/°C - **Specific Heat Capacity**: 455 J/kg·K --- #### **4. Product Applications** **Critical High-Temperature Service:** - Catalytic cracking reactor vessels - Hydroprocessing equipment - High-temperature high-pressure reactors - Refinery severe service pressure vessels **Advanced Power Generation:** - High-temperature boiler components - Steam reforming systems - Advanced heat exchanger systems - High-pressure high-temperature piping **Petrochemical Processing:** - Ethylene cracking furnace components - Hydrotreating reactors - High-temperature process vessels - Refinery conversion units **Specialized Applications:** - Synthetic fuel processing equipment - High-temperature chemical reactors - Advanced energy systems - High-pressure high-temperature (HPHT) equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Controlled Weldability**: Requires qualified welding procedures - **Preheat Requirements**: 200-300°C (400-575°F) mandatory - **Post-Weld Heat Treatment**: Essential at 730-760°C (1350-1400°F) - **Recommended Processes**: GTAW, SMAW with strict low-hydrogen control - **Filler Metals**: E502-XX, E505-XX or equivalent high-temperature grades **Forming & Machining:** - **Limited Formability**: Hot forming essential for all significant deformation - **Machinability**: Fair to poor (approximately 45% of B1112 steel) - **Cutting Methods**: Waterjet and laser cutting preferred - **Hot Working Range**: 1050-1150°C (1920-2100°F) **Heat Treatment:** - Supplied in normalized and tempered condition - Normalizing temperature: 950-980°C (1740-1800°F) - Tempering temperature: 700-750°C (1290-1380°F) - Microstructure: Tempered martensite or bainite structure **Quality Assurance:** - **Enhanced Testing Protocol**: Multiple test locations required - **Comprehensive Impact Testing**: Stringent toughness requirements - **Advanced NDT**: Full ultrasonic examination typically required - **Metallurgical Verification**: Microstructure and grain size evaluation --- ### **Technical Summary** ASTM A387 Grade 5 Class 2 represents the premium grade in the 5Cr-0.5Mo alloy steel series, offering the highest strength level combined with exceptional high-temperature corrosion resistance. The normalized and tempered heat treatment produces an optimal microstructure that provides outstanding creep strength, thermal stability, and resistance to high-temperature corrosion. With a minimum yield strength of 60 ksi (415 MPa), Class 2 offers approximately 35% higher strength than Class 1, enabling more efficient designs for high-pressure applications while maintaining excellent elevated temperature capabilities. The 5% chromium content provides superior resistance to oxidation, sulfidation, and other high-temperature corrosive environments encountered in refinery and petrochemical processing. This grade demonstrates exceptional performance in severe service applications involving exposure to sulfur compounds, hydrogen, and other corrosive media at elevated temperatures. The material's proven reliability in catalytic cracking units, hydroprocessing reactors, and other demanding refinery applications has established it as the material of choice for equipment operating in the most aggressive high-temperature environments. While requiring the most stringent fabrication controls and comprehensive quality assurance measures, Grade 5 Class 2 delivers unmatched performance in critical high-temperature, high-pressure service conditions. Its ability to maintain mechanical integrity under extreme operating conditions while resisting high-temperature corrosion makes it indispensable for advanced refinery processes, petrochemical processing, and high-temperature pressure vessel applications where safety, reliability, and long-term performance are paramount considerations. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 5, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4373 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 A387 Alloy Steel, Grade 5, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel Wire, Grade 5, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Wire, Grade 5, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Wire, Grade 5, 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 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 844 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