Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2

ASTM A387 Alloy Steel Spherical Powder, Grade 2, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Spherical Powder, Grade 2, Class 2 Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2 characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2 Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2 Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2 Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 2, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 2 Class 2 Alloy Steel Plate** **ASTM A387 Grade 2 Class 2** is a chromium-molybdenum alloy steel plate specifically designed for **pressure vessel and high-temperature service**. The "Grade 2" designation indicates its chemical composition (primarily 0.5-0.8% Chromium and 0.44-0.65% Molybdenum), while "Class 2" specifies that the material has been supplied in the **Normalized and Tempered (N&T) heat treatment condition**. This heat treatment provides an optimal combination of enhanced strength, good toughness, and improved microstructural stability compared to the as-rolled condition of Class 1. This material is renowned for its **creep resistance** and strength at elevated temperatures (typically up to about 540°C / 1000°F), making it a primary choice for critical applications in the power generation, petrochemical, and refining industries. --- #### **1. Key International Standards** * **Primary Material Standard:** **ASTM A387/A387M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum. * **Common Supplementary Standards:** * **ASTM A20/A20M:** Standard Specification for General Requirements for Steel Plates for Pressure Vessels. * **ASME Section II, Part A:** The ASME Boiler and Pressure Vessel Code adopts this material as **SA-387 Grade 2 Class 2**. * **EN 10028-2:** The comparable European standard is **P11** (1.7335). --- #### **2. Chemical Composition (Weight %, ASTM A387)** | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.05 - 0.21 | | Manganese (Mn) | 0.30 - 0.80 | | Phosphorus (P), max | 0.035 | | Sulfur (S), max | 0.035 | | Silicon (Si) | 0.15 - 0.40 | | Chromium (Cr) | 0.50 - 0.80 | | Molybdenum (Mo) | 0.44 - 0.65 | *Note: The specified range for Chromium is intentionally low, classifying it as a low-chromium alloy steel.* --- #### **3. Mechanical & Physical Properties (Typical for Class 2, N&T Condition)** * **Tensile Strength:** **415 - 585 MPa** (60,000 - 85,000 psi) * **Yield Strength (min):** **240 MPa** (35,000 psi) * **Elongation in 2 in. (50 mm) (min):** 20% * **Hardness (Typical):** Approximately 150-200 HB * **Physical Properties (At Room Temperature):** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Modulus of Elasticity:** 200 GPa (29 x 10⁶ psi) * **Thermal Conductivity:** ~ 45 W/m·K * **Coefficient of Thermal Expansion:** 12.2 x 10⁻⁶ /K (20-100°C) --- #### **4. Key Characteristics & Advantages** * **Elevated Temperature Strength:** Maintains good tensile and yield strength at temperatures where carbon steel would weaken significantly. * **Creep Resistance:** Resists deformation under sustained stress at high temperatures, a critical property for long-term pressure vessel operation. * **Hydrogen Attack Resistance:** The molybdenum content provides resistance to decarburization and embrittlement in high-temperature hydrogen environments (e.g., hydrocrackers). * **Toughness & Weldability:** The normalized and tempered microstructure offers good notch toughness and fair weldability, though pre-heat and post-weld heat treatment (PWHT) are **mandatory** to prevent cracking and restore properties in the heat-affected zone (HAZ). --- #### **5. Product Applications** ASTM A387 Gr.2 Cl.2 is extensively used in the fabrication of welded pressure vessels and components for: * **Power Generation:** * Fossil fuel steam boilers (drums, headers, steam piping) * Heat recovery steam generators (HRSGs) * **Petrochemical & Refining:** * Hydroprocessing Reactors (e.g., Hydrotreater, Hydrocracker shells) * Catalytic reformers * High-temperature separators and pressure vessels * **General Pressure Vessels:** For processes involving temperatures exceeding the safe limit of carbon steel (ASME SA-516). --- #### **6. Fabrication Notes** * **Welding:** Requires careful procedure. Common filler metals include AWS A5.5 E70XX-B2L for SMAW or equivalent for other processes. * **Heat Treatment:** **Pre-heating** (typically 150-200°C / 300-400°F) and mandatory **Post-Weld Heat Treatment (PWHT)** in the range of 620-700°C (1150-1300°F) are essential to relieve stresses and temper the HAZ. * **Forming:** Can be hot or cold formed, but severe cold forming may necessitate subsequent stress relieving. **In summary, ASTM A387 Grade 2 Class 2 is a foundational, cost-effective chromium-molybdenum alloy steel plate that delivers reliable performance in medium-to-high temperature pressure vessel applications, where its balanced properties of strength, creep resistance, and fabricability are essential for safe and long-term operation.** -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 2, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <6000 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 A387 Alloy Steel, Grade 2, Class 2 Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2 Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A387 Alloy Steel Powder, Grade 2, Class 2 -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A387 Alloy Steel Spherical Powder, Grade 2, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Spherical Powder, Grade 2, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Spherical Powder, Grade 2, Class 2 -:- 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 Spherical Powder 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 2471 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