ASTM A387 Alloy Steel, Grade 5, Class 1

ASTM A387 Alloy Steel, Grade 5, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 5, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 5, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 5 Class 1 Steel** **ASTM A387 Grade 5 Class 1** is a chromium-molybdenum alloy steel plate designed for pressure vessel applications requiring good elevated temperature strength and corrosion resistance. This specification covers plates in the annealed or normalized and tempered condition, suitable for welded pressure vessels operating in moderate to high temperature service environments. --- #### **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 1** - Annealed or 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: | 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:** - **Higher Chromium Content**: 4.00-6.00% for superior oxidation and corrosion resistance - **Molybdenum Addition**: 0.45-0.65% for creep strength enhancement - **Controlled Carbon**: Maximum 0.15% for weldability and toughness - **Low Manganese**: 0.30-0.60% for improved high-temperature properties --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Class 1 condition):** | Property | Value | |---|---| | **Tensile Strength** | 515-690 MPa (75-100 ksi) | | **Yield Strength (min.)** | 310 MPa (45 ksi) | | **Elongation in 2" (min.)** | 18% | | **Elongation in 8" (min.)** | 20% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 650°C (1200°F) - **Creep Strength**: Good resistance to creep deformation - **Oxidation Resistance**: Excellent in high-temperature environments - **Sulfidation Resistance**: Good performance in sulfur-containing atmospheres **Physical Properties:** - **Density**: 7.80 g/cm³ (0.282 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 36.5 W/m·K - **Coefficient of Thermal Expansion**: 11.2 × 10⁻⁶/°C - **Specific Heat Capacity**: 460 J/kg·K --- #### **4. Product Applications** **High-Temperature Pressure Vessels:** - Catalytic cracking units - Hydroprocessing reactors - High-temperature reactors - Refinery pressure vessels **Power Generation:** - High-temperature boiler components - Steam reforming tubes - Heat exchanger systems - Power plant pressure parts **Petrochemical Industry:** - Ethylene cracking furnaces - Reformers and hydrotreaters - High-temperature process equipment - Chemical processing vessels **Industrial Applications:** - High-temperature processing equipment - Thermal reactor systems - Industrial furnace components - High-temperature manufacturing equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Fair Weldability**: Requires careful procedure control - **Preheat Requirements**: 200-300°C (400-575°F) minimum - **Post-Weld Heat Treatment**: Mandatory at 730-760°C (1350-1400°F) - **Recommended Processes**: GTAW, SMAW (low-hydrogen) - **Filler Metals**: E502-XX, E505-XX or equivalent **Forming & Machining:** - **Moderate Formability**: Hot forming required for complex shapes - **Machinability**: Fair (approximately 50% of B1112 steel) - **Cutting Methods**: Plasma and waterjet cutting recommended - **Hot Working Temperature**: 1050-1150°C (1920-2100°F) **Heat Treatment:** - Supplied in annealed or normalized and tempered condition - Normalizing temperature: 950-980°C (1740-1800°F) - Tempering temperature: 700-750°C (1290-1380°F) - Annealing temperature: 850-880°C (1560-1615°F) **Quality Assurance:** - **Comprehensive Testing**: Full mechanical and chemical analysis - **Impact Testing**: Required for pressure vessel applications - **Hardness Testing**: Mandatory quality control - **Non-Destructive Testing**: UT, RT, MT as specified --- ### **Technical Summary** ASTM A387 Grade 5 Class 1 represents an intermediate chromium-molybdenum alloy steel offering significantly improved high-temperature corrosion resistance compared to lower chromium grades. The 5% chromium content provides excellent resistance to oxidation, sulfidation, and other high-temperature corrosive environments, while the molybdenum addition ensures good creep strength and thermal stability. This grade is particularly suitable for applications involving exposure to sulfur compounds and other corrosive media at elevated temperatures, making it ideal for refinery and petrochemical processing equipment. The material demonstrates excellent performance in catalytic cracking units, reformer furnaces, and other high-temperature processing applications where both mechanical strength and corrosion resistance are critical requirements. While requiring more careful fabrication controls than lower alloy steels, particularly in welding and heat treatment operations, Grade 5 Class 1 delivers reliable performance in demanding high-temperature service conditions. The material's proven service history in refinery and petrochemical applications has established it as a preferred choice for equipment operating in aggressive high-temperature environments where lower alloy steels would suffer from excessive corrosion. The balanced combination of high-temperature strength, excellent corrosion resistance, and reasonable fabrication characteristics makes ASTM A387 Grade 5 Class 1 a valuable material selection for engineers designing pressure vessels and process equipment for severe high-temperature service in the petroleum refining, chemical processing, and power generation industries. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 5, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4372 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 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel, Grade 5, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel, Grade 5, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel, Grade 5, 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 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 843 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