ASTM A302 Alloy Steel Sheet,Plate, Grade A

ASTM A302 Alloy Steel Sheet/Plate, Grade A Product Information -:- For detailed product information, please contact sales. -: ASTM A302 Alloy Steel Sheet/Plate, Grade A Synonyms -:- For detailed product information, please contact sales. -:

ASTM A302 Alloy Steel, Grade A Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A302 Alloy Steel, Grade A** **ASTM A302 Grade A** is a manganese-molybdenum-nickel alloy steel plate designed for pressure vessel applications requiring enhanced mechanical properties, particularly for intermediate and high-temperature service. This grade offers improved strength and toughness compared to carbon steels, making it suitable for welded pressure vessels in demanding service conditions. --- #### **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 A** - Manganese-molybdenum-nickel alloy steel - Other grades: B, C, D with varying chemical compositions **International Equivalents:** - **EN 10028-2**: 15MnNi6-3 - **JIS G3119**: SPV 410 - **GB/T 713**: 15MnNi - **ISO 9328-2**: 15MnNi6-3 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A302 Grade A: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.20 | | 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 | | Nickel (Ni) | 0.40-0.70 | **Key Composition Features:** - **Manganese-Molybdenum System**: Primary strengthening mechanism - **Nickel Addition**: 0.40-0.70% for enhanced toughness - **Molybdenum Content**: 0.45-0.60% for elevated temperature strength - **Controlled Carbon**: Maximum 0.20% for weldability --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 550-690 MPa (80-100 ksi) | | **Yield Strength (min.)** | 345 MPa (50 ksi) | | **Elongation in 2" (min.)** | 18% | | **Elongation in 8" (min.)** | 20% | **Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: -50°F (-45°C) - **Minimum Impact Energy**: 20 ft-lbf (27 J) - **Good Low-Temperature Toughness**: Suitable for low-temperature service **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 49.0 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C - **Specific Heat Capacity**: 475 J/kg·K --- #### **4. Product Applications** **Pressure Vessel Applications:** - Intermediate temperature pressure vessels - High-pressure storage tanks - Process reactors - Boiler components **Power Generation:** - Power plant pressure vessels - Steam drums - Heat exchanger shells - Feedwater heaters **Chemical Processing:** - Chemical reactors - Distillation columns - High-pressure process vessels - Petrochemical equipment **Industrial Applications:** - Industrial boilers - Manufacturing pressure vessels - Heavy equipment pressure components - Energy industry equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 200-300°F (95-150°C) depending on thickness - **Post-Weld Heat Treatment**: Mandatory at 1100-1200°F (595-650°C) - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E8018-C3, ER80S-G or equivalent **Forming & Machining:** - **Moderate Formability**: Suitable for pressure vessel forming - **Machinability**: Fair (approximately 55% of B1112 steel) - **Cutting Methods**: Plasma, laser, and waterjet cutting - **Hot Forming**: Preferred for complex shapes **Heat Treatment:** - Typically supplied in normalized and tempered condition - Normalizing temperature: 1600-1700°F (870-925°C) - Tempering temperature: 1100-1250°F (595-675°C) - Microstructural control maintained **Quality Assurance:** - **Mandatory Impact Testing**: Charpy V-Notch at specified temperature - **Chemical Analysis**: Full heat certification - **Mechanical Testing**: Comprehensive property verification - **Non-Destructive Testing**: As specified by purchaser --- ### **Technical Summary** ASTM A302 Grade A represents a versatile manganese-molybdenum-nickel alloy steel specifically engineered for pressure vessel applications requiring enhanced mechanical properties and good low-temperature toughness. With a minimum yield strength of 50 ksi (345 MPa) and impact properties tested at -50°F (-45°C), this grade provides reliable performance for a wide range of pressure vessel services. The strategic combination of manganese for solid solution strengthening, molybdenum for elevated temperature strength, and nickel for toughness enhancement creates an optimal material for intermediate temperature pressure vessel applications. The alloy system ensures good strength retention at elevated temperatures while maintaining adequate toughness at lower service temperatures. This grade demonstrates excellent fabrication characteristics when proper procedures are followed, particularly in welding and heat treatment operations. The material's consistent response to thermal processing and reliable mechanical properties have established it as a preferred choice for pressure vessels in power generation, chemical processing, and industrial applications where both strength and toughness requirements must be met. ASTM A302 Grade A has proven its reliability in critical pressure vessel service, offering an optimal balance between performance characteristics and cost-effectiveness for applications requiring properties beyond those available from carbon-manganese steels but where premium alloy steels are not justified by service conditions. -:- For detailed product information, please contact sales. -: ASTM A302 Alloy Steel, Grade A Specification Dimensions Size： Diameter 20-1000 mm Length <4354 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 A Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A302 Alloy Steel Sheet/Plate, Grade A -:- 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 Sheet/Plate 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 825 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