ASTM A387 Alloy Steel, Grade 11, Class 1

ASTM A387 Alloy Steel, Grade 11, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 11, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 11, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 11 Class 1 Steel** **ASTM A387 Grade 11 Class 1** is a chromium-molybdenum alloy steel plate designed for pressure vessel applications requiring elevated temperature service. This specification covers plates in the annealed or normalized and tempered condition, suitable for welded pressure vessels where improved creep strength and elevated temperature properties are required. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A387/A387M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum" **Grade Classification:** - **Grade 11** - 1.25% Chromium - 0.50% Molybdenum alloy steel - **Class 1** - Annealed or normalized and tempered condition **International Equivalents:** - **EN 10028-2**: 13CrMo4-5 - **JIS G4109**: SCMV 4 - **GB/T 3077**: 15CrMo - **ISO 9328-2**: 13CrMo4-5 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A387 Grade 11: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.05-0.17 | | Manganese (Mn) | 0.40-0.65 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.50-0.80 | | Chromium (Cr) | 1.00-1.50 | | Molybdenum (Mo) | 0.45-0.65 | **Key Composition Features:** - **Chromium Content**: 1.00-1.50% for oxidation resistance - **Molybdenum Addition**: 0.45-0.65% for creep strength - **Controlled Carbon**: 0.05-0.17% for weldability and strength balance - **Silicon Enhancement**: 0.50-0.80% for deoxidation and strength --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Class 1 condition):** | Property | Value | |---|---| | **Tensile Strength** | 415-585 MPa (60-85 ksi) | | **Yield Strength (min.)** | 240 MPa (35 ksi) | | **Elongation in 2" (min.)** | 22% | | **Elongation in 8" (min.)** | 25% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 595°C (1100°F) - **Creep Strength**: Good resistance to creep deformation - **Oxidation Resistance**: Improved over carbon steels - **Thermal Stability**: Maintains properties at elevated temperatures **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 47.5 W/m·K - **Coefficient of Thermal Expansion**: 11.9 × 10⁻⁶/°C - **Specific Heat Capacity**: 470 J/kg·K --- #### **4. Product Applications** **Pressure Vessel Industry:** - High-temperature pressure vessels - Petrochemical reactors - Hydrocracking equipment - Catalytic cracking units **Power Generation:** - Boiler drums and shells - Steam piping systems - High-temperature heat exchangers - Power plant pressure components **Petrochemical Industry:** - Refinery pressure vessels - Chemical process equipment - High-temperature storage vessels - Process industry reactors **Industrial Applications:** - Industrial heating equipment - Thermal processing vessels - High-temperature manufacturing equipment - Process industry components --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 150-200°C (300-400°F) minimum - **Post-Weld Heat Treatment**: Mandatory at 675-705°C (1250-1300°F) - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E8018-B2, ER80S-B2 or equivalent **Forming & Machining:** - **Good Formability**: Suitable for hot forming operations - **Machinability**: Fair (approximately 55% of B1112 steel) - **Cutting Methods**: Plasma, laser, and waterjet cutting recommended - **Hot Working**: Preferred for complex shapes **Heat Treatment:** - Supplied in annealed or normalized and tempered condition - Normalizing temperature: 900-925°C (1650-1700°F) - Tempering temperature: 650-705°C (1200-1300°F) - Stress relieving: 675-705°C (1250-1300°F) **Quality Assurance:** - **Mandatory Testing**: Tensile and chemical analysis - **Impact Testing**: When specified by purchaser - **Hardness Testing**: Typically required - **Non-Destructive Testing**: As specified for pressure vessel applications --- ### **Technical Summary** ASTM A387 Grade 11 Class 1 represents a reliable chromium-molybdenum alloy steel specifically engineered for pressure vessel applications requiring enhanced performance at elevated temperatures. The 1.25% chromium content provides improved oxidation resistance, while the 0.50% molybdenum addition enhances creep strength and high-temperature stability. This grade offers an optimal balance between elevated temperature performance and fabrication characteristics, making it suitable for a wide range of pressure vessel applications in power generation, petrochemical processing, and industrial heating systems. The Class 1 condition (annealed or normalized and tempered) ensures good ductility and toughness while maintaining adequate strength levels. While requiring more careful fabrication controls than carbon steels, particularly in welding and heat treatment operations, Grade 11 Class 1 delivers reliable performance in high-temperature service up to 595°C (1100°F). The material's proven service history in critical pressure vessel applications has established it as a trusted choice for engineers designing equipment for elevated temperature service where both mechanical performance and long-term reliability are essential considerations. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 11, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4362 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 11, Class 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel, Grade 11, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel, Grade 11, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel, Grade 11, 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 833 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