ASTM A302 Alloy Steel Tube,Pipe, Grade B

ASTM A302 Alloy Steel Tube, Grade B Product Information -:- For detailed product information, please contact sales. -: ASTM A302 Alloy Steel Tube, Grade B Synonyms -:- For detailed product information, please contact sales. -:

ASTM A302 Alloy Steel, Grade B Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A302 Alloy Steel, Grade B** **ASTM A302 Grade B** is a manganese-molybdenum alloy steel plate designed for pressure vessel applications requiring higher strength and improved temperature resistance. This grade offers enhanced mechanical properties compared to Grade A, making it suitable for more demanding pressure vessel service conditions, particularly in elevated temperature applications. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A302/A302M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel" **Grade Classification:** - **Grade B** - Manganese-molybdenum alloy steel - Other grades: A, C, D with varying chemical compositions **International Equivalents:** - **EN 10028-2**: 16Mo3 - **JIS G3119**: SPV 410 - **GB/T 713**: 16Mn - **ISO 9328-2**: 16Mo3 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A302 Grade B: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.21 | | Manganese (Mn) | 1.15-1.50 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.15-0.40 | | Molybdenum (Mo) | 0.45-0.60 | **Key Composition Features:** - **Manganese-Molybdenum System**: Enhanced strengthening without nickel - **Higher Carbon Content**: 0.21% maximum for increased strength - **Molybdenum Optimization**: 0.45-0.60% for creep resistance - **Nickel-Free**: Distinguishes from Grade A composition --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 585-760 MPa (85-110 ksi) | | **Yield Strength (min.)** | 380 MPa (55 ksi) | | **Elongation in 2" (min.)** | 17% | | **Elongation in 8" (min.)** | 19% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 450°C (840°F) - **Creep Strength**: Improved over Grade A - **Temperature Resistance**: Better high-temperature performance **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 48.5 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C - **Specific Heat Capacity**: 470 J/kg·K --- #### **4. Product Applications** **High-Pressure Vessel Applications:** - High-pressure storage vessels - Thick-walled pressure containers - High-temperature process equipment - Power generation pressure components **Power Generation Industry:** - High-pressure steam drums - Power plant pressure vessels - High-temperature heat exchangers - Turbine bypass systems **Petrochemical Applications:** - High-pressure reactors - Refinery pressure vessels - Petrochemical process equipment - High-temperature separators **Industrial Equipment:** - Heavy industrial pressure vessels - Manufacturing pressure systems - High-capacity storage tanks - Process industry equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: Requires careful procedure control - **Preheat Requirements**: 250-350°F (120-175°C) recommended - **Post-Weld Heat Treatment**: Mandatory at 1100-1200°F (595-650°C) - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E9018-G, ER90S-G or equivalent **Forming & Machining:** - **Moderate Formability**: Hot forming preferred for thick sections - **Machinability**: Fair (approximately 50% of B1112 steel) - **Cutting Methods**: Plasma, waterjet, and laser cutting recommended - **Tooling Requirements**: Carbide tools preferred **Heat Treatment:** - Supplied in normalized and tempered condition - Normalizing temperature: 1600-1700°F (870-925°C) - Tempering temperature: 1150-1250°F (620-675°C) - Enhanced microstructural control **Quality Assurance:** - **Comprehensive Testing**: Tensile, impact, and chemical analysis - **Impact Testing**: Typically required for pressure vessel applications - **Non-Destructive Testing**: UT, RT, MT as specified - **Full Certification**: Complete traceability and test reports --- ### **Technical Summary** ASTM A302 Grade B represents an enhanced manganese-molybdenum alloy steel specifically designed for pressure vessel applications requiring higher strength and improved elevated temperature performance. With a minimum yield strength of 55 ksi (380 MPa), this grade offers approximately 10% higher strength than Grade A, providing significant advantages in weight reduction and design efficiency for high-pressure applications. The nickel-free chemistry distinguishes Grade B from Grade A, relying on optimized manganese and molybdenum content to achieve the required mechanical properties. The enhanced carbon level and molybdenum content contribute to improved strength and better creep resistance at elevated temperatures up to 450°C (840°F). While requiring more stringent fabrication controls and mandatory post-weld heat treatment, Grade B delivers reliable performance in demanding pressure vessel applications. The material's consistent response to thermal processing and proven service history have established it as a preferred choice for high-pressure vessels in power generation, petrochemical processing, and heavy industrial applications. ASTM A302 Grade B has demonstrated excellent performance in critical pressure vessel service, offering an optimal balance between enhanced mechanical properties and fabrication practicality for applications where higher strength and improved temperature resistance are essential design requirements. -:- For detailed product information, please contact sales. -: ASTM A302 Alloy Steel, Grade B Specification Dimensions Size： Diameter 20-1000 mm Length <4355 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 A302 Alloy Steel, Grade B Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A302 Alloy Steel Tube, Grade B -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A302 Alloy Steel Tube, Grade B -:- For detailed product information, please contact sales. -:

Packing of ASTM A302 Alloy Steel Tube, Grade B -:- 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 Tube 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 826 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