Spherical ASTM A387 Alloy Steel Powder, Grade 5, Class 2

ASTM A387 Alloy Steel Spherical Powder, Grade 5, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Spherical Powder, Grade 5, Class 2 Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, Grade 5, Class 2 characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, Grade 5, 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 5, 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 5, Class 2 Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 5, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 5 Class 2 Alloy Steel Plate** **ASTM A387 Grade 5 Class 2** is a chromium-molybdenum alloy steel plate designed for **high-temperature and high-pressure service in welded pressure vessels**. While sharing the identical chemical composition with Grade 5 Class 1, the **“Class 2”** designation is critical: it specifies that the material is supplied in the **Normalized and Tempered (N&T) heat treatment condition** by the steel mill. This pre-conditioning delivers a refined, homogeneous microstructure, resulting in superior and more consistent mechanical properties, particularly enhanced toughness and strength, compared to the as-rolled Class 1 condition. This material is the preferred choice for critical components where **reliable performance, improved impact resistance, and greater design certainty** are required, especially in severe service environments of the petrochemical and power 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 5 Class 2**. * **EN 10028-2:** The comparable European standard is **P5** (1.7362), typically supplied in a condition equivalent to N&T. --- #### **2. Chemical Composition (Weight %, ASTM A387)** *Identical to Grade 5 Class 1.* | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P), max | 0.035 | | Sulfur (S), max | 0.035 | | Silicon (Si) | 0.50 max | | Chromium (Cr) | 4.00 - 6.00 | | Molybdenum (Mo) | 0.45 - 0.65 | *Note: The 4-6% Chromium content provides enhanced oxidation and sulfidation resistance.* --- #### **3. Mechanical & Physical Properties (For Class 2, N&T Condition)** *Note the improved minimum yield strength compared to Class 1.* * **Tensile Strength:** **415 - 585 MPa** (60,000 - 85,000 psi) * **Yield Strength (min):** **240 MPa** (35,000 psi) *[Higher than Class 1's 205 MPa min.]* * **Elongation in 2 in. (50 mm) (min):** 18% * **Hardness (Typical):** Approximately 170-220 HB * **Impact Toughness:** Typically exhibits better and more consistent Charpy V-Notch (CVN) impact values than Class 1 due to the normalized and tempered microstructure. * **Physical Properties (At Room Temperature):** * **Density:** 7.83 g/cm³ (0.283 lb/in³) * **Modulus of Elasticity:** 200 GPa (29 x 10⁶ psi) * **Thermal Conductivity:** ~ 37 W/m·K * **Coefficient of Thermal Expansion:** ~ 11.5 x 10⁻⁶ /K (20-100°C) --- #### **4. Key Characteristics & Advantages (vs. Class 1)** * **Guaranteed Enhanced Properties:** The mill-applied N&T treatment ensures the material meets the higher minimum yield strength (240 MPa vs. 205 MPa) and provides a more uniform property profile throughout the plate thickness and across the production heat. * **Superior Toughness:** The normalized and tempered structure offers significantly improved notch toughness and ductility at both room and lower temperatures, reducing the risk of brittle fracture. This is crucial for large, thick-walled pressure vessels. * **Improved Weldability & Fabrication Consistency:** The homogeneous and softened N&T structure can simplify subsequent fabrication. While pre-heat and PWHT remain mandatory, the starting condition is more predictable. * **Microstructural Stability:** The N&T process produces a stable microstructure of tempered bainite or ferrite-pearlite, which is optimal for long-term high-temperature service and resists degradation. * **Reduced Fabricator Heat Treatment Complexity:** For applications where the final component does not require extensive hot forming, the fabricator may only need to perform a **Post-Weld Heat Treatment (PWHT)** to relieve stresses, rather than a full re-normalizing cycle (unless the weld thermal cycle severely alters the base metal properties). --- #### **5. Product Applications** Grade 5 Class 2 is used in the same demanding sectors as Class 1, but is often specified for more critical or thicker-section components: * **Petrochemical & Refining:** * **Thick-walled Reactors and Separators** in catalytic cracking and hydrocracking units. * **High-Pressure, High-Temperature Heat Exchanger** shells. * Critical piping and headers in sulfur recovery plants. * **Power Generation:** * **Steam Drums and Headers** in fossil fuel boilers (where high toughness is mandated by code). * High-temperature sections of **Heat Recovery Steam Generators (HRSGs)**. * **General Pressure Vessels:** For services involving thermal cycling or where low-temperature start-up conditions necessitate higher impact toughness. --- #### **6. Fabrication Notes** * **Welding:** Similar to Class 1. Requires strict procedure qualification. Use low-hydrogen practices with matching B5-classified filler metals (e.g., AWS A5.5 E80XX-B5). **Pre-heating** (150-250°C / 300-480°F) is essential. * **Post-Weld Heat Treatment (PWHT):** **Mandatory.** Must be performed at temperatures **below the original tempering temperature** used by the mill (typically in the range of 650-730°C / 1200-1350°F) to avoid over-tempering and loss of strength. The exact temperature must be controlled per the qualified welding procedure. * **Forming:** Can be cold or hot formed. However, if hot forming exceeds certain temperature limits (e.g., above 925°C / 1700°F), a full re-normalizing and tempering heat treatment may be required after forming to restore the original properties. **In summary, ASTM A387 Grade 5 Class 2 represents the premium supply condition for Grade 5 alloy steel. By specifying Class 2, designers and fabricators procure a material with guaranteed, optimized mechanical properties and microstructure from the mill, providing an additional margin of safety, reliability, and fabricability for the most critical high-temperature pressure vessel applications.** -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 5, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <6002 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 5, Class 2 Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A387 Alloy Steel Powder, Grade 5, Class 2 Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A387 Alloy Steel Powder, Grade 5, 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 5, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Spherical Powder, Grade 5, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Spherical Powder, Grade 5, 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 2473 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