ASTM A204 Low Alloy Steel Tube,Pipe, Grade B

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

ASTM A204 Low Alloy Steel, Grade B Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A204 Grade B Steel** **ASTM A204 Grade B** is a molybdenum-alloy steel plate offering enhanced mechanical properties for pressure vessel applications requiring improved performance at elevated temperatures. With increased molybdenum content compared to Grade A, this grade provides superior strength and better creep resistance for more 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 B** - Enhanced molybdenum alloy steel - Other grades: A, C with varying molybdenum content **International Equivalents:** - **EN 10028-2**: 16Mo3 - **JIS G3109**: SCMV 2 - **GB/T 3077**: 20Mo - **ISO 9328-2**: 16Mo3 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A204 Grade B: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.20 | | 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:** - **Optimized Molybdenum**: 0.45-0.60% for improved high-temperature strength - **Controlled Carbon**: Balanced for strength and weldability - **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** | 485-620 MPa (70-90 ksi) | | **Yield Strength (min.)** | 275 MPa (40 ksi) | | **Elongation in 2" (min.)** | 22% | | **Elongation in 8" (min.)** | 25% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 455°C (850°F) - **Creep Strength**: Superior to Grade A - **Oxidation Resistance**: Suitable for extended high-temperature service - **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**: 49.0 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C - **Specific Heat Capacity**: 475 J/kg·K --- #### **4. Product Applications** **High-Temperature Pressure Vessels:** - Boiler drums for higher pressure service - Superheater components - High-pressure heat exchangers - Process reactors for elevated temperature service **Power Generation Equipment:** - Intermediate pressure steam drums - Power plant piping systems - High-temperature feedwater heaters - Turbine bypass systems **Petrochemical Industry:** - Refinery pressure vessels - High-temperature separators - Process heaters - Catalytic cracker components **Chemical Processing:** - High-temperature reactors - Process columns - Thermal fluid systems - High-pressure synthesis vessels --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 175-225°C (350-450°F) recommended - **Post-Weld Heat Treatment**: Stress relieving at 595-650°C (1100-1200°F) - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E7018, ER70S-6 or equivalent **Forming & Machining:** - **Good Formability**: Suitable for hot forming operations - **Machinability**: Good (approximately 60% of B1112 steel) - **Cutting Methods**: Plasma, laser, and mechanical cutting - **Heat Treatment Response**: Good response to normalizing and tempering **Heat Treatment:** - Typically supplied in normalized condition - Normalizing temperature: 900-940°C (1650-1725°F) - Optional tempering for specific property requirements **Quality Assurance:** - **Mandatory Testing**: Tensile and chemical analysis - **Impact Testing**: When specified by purchaser - **Non-Destructive Testing**: As required by application - **Certification**: Full traceability and test reports --- ### **Technical Summary** ASTM A204 Grade B represents an enhanced molybdenum-alloy steel solution for pressure vessel applications requiring improved performance at elevated temperatures. With a minimum yield strength of 40 ksi (275 MPa), this grade offers approximately 5% higher strength than Grade A, providing better design efficiency for high-pressure applications. The optimized molybdenum content (0.45-0.60%) delivers reliable performance at temperatures up to 455°C (850°F), making Grade B suitable for more demanding service conditions than Grade A. The enhanced creep strength and thermal stability allow for extended service life in high-temperature applications. This grade maintains good fabrication characteristics while offering improved high-temperature performance. The material's response to standard heat treatments and consistent mechanical properties make it a reliable choice for applications in power generation, petrochemical processing, and high-temperature industrial equipment. The proven service history and cost-effectiveness of ASTM A204 Grade B have established it as a preferred material for engineers designing pressure vessels and high-temperature components where enhanced performance over Grade A is required, but the premium cost of higher alloy steels is not justified by the service conditions. -:- For detailed product information, please contact sales. -: ASTM A204 Low Alloy Steel, Grade B Specification Dimensions Size： Diameter 20-1000 mm Length <4337 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 B Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A204 Low 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 808 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