ASTM A204 Low Alloy Steel Tube,Pipe, Grade C

ASTM A204 Low Alloy Steel Tube, Grade C Product Information -:- For detailed product information, please contact sales. -: ASTM A204 Low Alloy Steel Tube, Grade C Synonyms -:- For detailed product information, please contact sales. -:

ASTM A204 Low Alloy Steel, Grade C Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A204 Grade C Steel** **ASTM A204 Grade C** is a high-performance molybdenum-alloy steel plate representing the premium grade in the A204 specification, designed for pressure vessel applications requiring superior mechanical properties at elevated temperatures. With the highest molybdenum content in the series, this grade offers exceptional strength and creep resistance for the most demanding high-temperature service conditions. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A204/A204M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Molybdenum" **Grade Classification:** - **Grade C** - Premium molybdenum alloy steel with highest strength - Other grades: A, B with lower molybdenum content **International Equivalents:** - **EN 10028-2**: 16Mo5 - **JIS G3109**: SCMV 3 - **GB/T 3077**: 25Mo - **ISO 9328-2**: 16Mo5 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A204 Grade C: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.23 | | 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:** - **Enhanced Molybdenum**: 0.45-0.60% for superior high-temperature performance - **Optimized Carbon**: Highest in series for maximum strength - **Manganese Control**: Maintains toughness while supporting strength - **Low Silicon**: Preserves excellent fabrication characteristics --- #### **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.)** | 20% | | **Elongation in 8" (min.)** | 23% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 470°C (880°F) - **Creep Strength**: Superior to Grades A and B - **Oxidation Resistance**: Enhanced for extended high-temperature service - **Thermal Stability**: Excellent property retention at elevated temperatures **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**: 11.7 × 10⁻⁶/°C - **Specific Heat Capacity**: 470 J/kg·K --- #### **4. Product Applications** **Critical High-Temperature Pressure Vessels:** - High-pressure boiler drums - Superheater and reheater components - High-temperature process reactors - Critical heat exchanger systems **Power Generation:** - High-pressure steam drums - Power plant main steam lines - Advanced feedwater heaters - High-temperature piping systems **Petrochemical and Refining:** - Hydrocracker reactors - High-temperature refinery vessels - Catalytic reforming units - Severe service process equipment **Chemical Processing:** - High-pressure synthesis reactors - Elevated temperature distillation columns - Thermal cracking vessels - Advanced chemical process equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability with Care**: Requires strict procedure control - **Preheat Requirements**: 200-250°C (400-480°F) recommended - **Post-Weld Heat Treatment**: Mandatory at 595-650°C (1100-1200°F) - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E8018-C3, ER80S-G or equivalent **Forming & Machining:** - **Moderate Formability**: Hot forming preferred for complex shapes - **Machinability**: Fair (approximately 55% of B1112 steel) - **Cutting Methods**: Plasma, laser, and waterjet cutting recommended - **Heat Treatment Response**: Excellent response to normalizing and tempering **Heat Treatment:** - Supplied in normalized and tempered condition - Normalizing temperature: 900-950°C (1650-1740°F) - Tempering temperature: 650-700°C (1200-1300°F) - Microstructural stability ensured **Quality Assurance:** - **Comprehensive Testing**: Tensile, chemical, and impact tests - **Impact Testing**: Typically required for pressure vessel applications - **Non-Destructive Testing**: UT, RT, MT as specified - **Certification**: Full traceability and comprehensive test reports --- ### **Technical Summary** ASTM A204 Grade C represents the premium grade in the molybdenum-alloy steel series, offering the highest strength level (50 ksi minimum yield strength) and superior high-temperature performance. With service capabilities up to 470°C (880°F), this grade provides exceptional creep resistance and thermal stability for the most demanding pressure vessel applications. The optimized molybdenum content, combined with carefully balanced carbon and manganese levels, delivers reliable performance in severe high-temperature service conditions. The 15% strength advantage over Grade A and 10% advantage over Grade B allow for more efficient vessel designs and significant material savings in high-pressure applications. While requiring more sophisticated fabrication control and mandatory post-weld heat treatment, Grade C remains within the capabilities of qualified pressure vessel fabricators. The material's consistent response to thermal processing and proven service history make it a trusted choice for critical applications in power generation, petrochemical processing, and high-temperature industrial equipment. ASTM A204 Grade C has established itself as a cost-effective solution for applications requiring performance beyond Grades A and B, but where the premium cost of chromium-molybdenum steels is not justified. Its reliable performance in critical high-temperature service ensures continued preference among engineers designing advanced pressure vessel systems. -:- For detailed product information, please contact sales. -: ASTM A204 Low Alloy Steel, Grade C Specification Dimensions Size： Diameter 20-1000 mm Length <4338 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 C Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A204 Low Alloy Steel Tube, Grade C -:- 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 809 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