ASTM A204 Low Alloy Steel Sheet,Plate, Grade A

ASTM A204 Low Alloy Steel Sheet/Plate, Grade A Product Information -:- For detailed product information, please contact sales. -: ASTM A204 Low Alloy Steel Sheet/Plate, Grade A Synonyms -:- For detailed product information, please contact sales. -:

ASTM A204 Low Alloy Steel, Grade A Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A204 Grade A Steel** **ASTM A204 Grade A** is a molybdenum-alloy steel plate specifically designed for pressure vessel applications requiring enhanced mechanical properties at elevated temperatures. This grade offers improved strength and creep resistance compared to carbon steels, making it suitable for moderate high-temperature service in various industrial applications. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A204/A204M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Molybdenum" **Grade Classification:** - **Grade A** - Standard molybdenum alloy steel - Other grades: B, C with increasing molybdenum content **International Equivalents:** - **EN 10028-2**: 16Mo3 - **JIS G3109**: SCMV 1 - **GB/T 3077**: 15Mo - **ISO 9328-2**: 16Mo3 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A204 Grade A: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.18 | | Manganese (Mn) | 0.90 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.30 | | Molybdenum (Mo) | 0.45-0.60 | **Key Composition Features:** - **Molybdenum Addition**: Primary alloying element for high-temperature strength - **Controlled Carbon**: Ensures good weldability and toughness - **Manganese Content**: Provides solid solution strengthening - **Low Silicon**: Maintains good fabrication characteristics --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 450-585 MPa (65-85 ksi) | | **Yield Strength (min.)** | 260 MPa (38 ksi) | | **Elongation in 2" (min.)** | 23% | | **Elongation in 8" (min.)** | 26% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 425°C (800°F) - **Creep Strength**: Improved over carbon steels - **Oxidation Resistance**: Suitable for moderate high-temperature service **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 49.5 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C - **Specific Heat Capacity**: 480 J/kg·K --- #### **4. Product Applications** **Pressure Vessel Industry:** - Boiler drums and shells - Heat exchanger components - Process vessels for elevated temperature service - Storage tanks operating at moderate temperatures **Power Generation:** - Feedwater heaters - Low-pressure steam drums - Economizer sections - Power plant piping systems **Chemical Processing:** - Reactor vessels - Distillation columns - Process heaters - Chemical storage equipment **Petroleum Industry:** - Refinery equipment - Oil and gas processing vessels - Pipeline pressure vessels - Separation equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 150-200°C (300-400°F) recommended - **Post-Weld Heat Treatment**: Stress relieving at 595-650°C (1100-1200°F) - **Recommended Processes**: SMAW, GMAW, SAW - **Filler Metals**: E7018, ER70S-6 or equivalent **Forming & Machining:** - **Good Formability**: Suitable for hot forming operations - **Machinability**: Good (approximately 65% of B1112 steel) - **Cutting Methods**: Plasma, oxy-fuel, and mechanical cutting - **Heat Treatment Response**: Good response to normalizing and tempering **Heat Treatment:** - Typically supplied in normalized condition - Normalizing temperature: 900-925°C (1650-1700°F) - Optional tempering for specific applications **Quality Assurance:** - **Mandatory Testing**: Tensile and chemical analysis - **Impact Testing**: When specified by purchaser - **Non-Destructive Testing**: As required by application - **Certification**: Full mill certification provided --- ### **Technical Summary** ASTM A204 Grade A represents an economical molybdenum-alloy steel solution for pressure vessel applications requiring improved performance at moderate elevated temperatures. The molybdenum addition provides enhanced strength and creep resistance compared to carbon steels, while maintaining reasonable cost and good fabrication characteristics. This grade is particularly valuable for applications operating in the temperature range where carbon steels begin to lose significant strength but where the premium cost of higher alloy steels cannot be justified. The material's balanced combination of strength, toughness, and elevated temperature performance makes it suitable for a wide range of pressure vessel applications in power generation, chemical processing, and industrial heating systems. The good weldability and formability characteristics, combined with the material's response to standard heat treatments, make ASTM A204 Grade A a versatile choice for fabricators. While requiring more careful welding procedures than carbon steels, it remains within the capabilities of most pressure vessel fabrication shops with proper procedure qualification and quality control measures. The proven service history of ASTM A204 Grade A in moderate temperature pressure vessel applications has established it as a reliable and cost-effective material choice for engineers designing equipment for continuous service at elevated temperatures up to 425°C (800°F). -:- For detailed product information, please contact sales. -: ASTM A204 Low Alloy Steel, Grade A Specification Dimensions Size： Diameter 20-1000 mm Length <4336 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 A204 Low Alloy Steel, Grade A Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A204 Low Alloy Steel Sheet,Plate, Grade A -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A204 Low Alloy Steel Sheet,Plate, Grade A -:- For detailed product information, please contact sales. -:

Packing of ASTM A204 Low 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 807 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