ASTM A387 Alloy Steel, Grade 9, Class 2

ASTM A387 Alloy Steel, Grade 9, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 9, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 9, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387/A387M Alloy Steel, Grade 9, Class 2** **1. Overview** ASTM A387 Grade 9 Class 2 is a chromium-molybdenum alloy steel plate specifically designed for welded pressure vessels and high-temperature applications. This grade offers enhanced mechanical properties through heat treatment, providing superior strength and toughness compared to its Class 1 counterpart. The "Class 2" designation indicates that the material is supplied in the normalized and tempered condition, making it suitable for more demanding service conditions where improved mechanical properties are required. **2. Key International Standards** * **Primary Standard:** **ASTM A387/A387M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum * **Dimensional & General Requirements:** * **ASTM A20/A20M** - Standard Specification for General Requirements for Steel Plates for Pressure Vessels * **Equivalent Standards:** * **EN/DIN:** 12CrMo9-10 (Similar European grade) * **JIS:** SCMV 26 (Japanese equivalent) * **ASME:** SA-387 Gr. 9 Cl. 2 (ASME Code Case version) **3. Chemical Composition (Weight %)** The chemical composition is carefully controlled to achieve the desired mechanical properties after heat treatment: | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P), max | 0.025 | | Sulfur (S), max | 0.025 | | Silicon (Si) | 0.50 - 1.00 | | Chromium (Cr) | 8.00 - 10.00 | | Molybdenum (Mo) | 0.90 - 1.10 | *Note: The balanced chromium and molybdenum content provides excellent high-temperature strength and corrosion resistance.* **4. Mechanical & Physical Properties** Grade 9 Class 2 is supplied in the normalized and tempered condition, which provides enhanced mechanical properties compared to Class 1. **Mechanical Properties (at room temperature):** | Property | Value | | :--- | :--- | | Tensile Strength | 485 - 620 MPa (70 - 90 ksi) | | Yield Strength (min) | 275 MPa (40 ksi) | | Elongation in 2 in. (50 mm), (min) | 20% | | **Hardness (typical)** | **~156-207 HB** | **Approximate Physical Properties:** * **Density:** 7.80 g/cm³ (0.282 lb/in³) * **Melting Point:** ~ 1400 - 1450 °C (2550 - 2640 °F) * **Modulus of Elasticity:** 200 GPa (29 × 10⁶ psi) * **Thermal Conductivity:** ~ 30.0 W/m·K (at 100°C) * **Coefficient of Thermal Expansion:** ~ 11.0 × 10⁻⁶ /K (20-100°C) * **Specific Heat Capacity:** ~ 460 J/kg·K (at 20°C) **5. Product Applications** ASTM A387 Gr 9 Cl 2 is widely used in various high-temperature and high-pressure applications across multiple industries: * **Power Generation:** Boiler pressure parts, steam drums, and high-temperature piping systems * **Petroleum Refining:** Hydroprocessing reactors, catalytic reformers, and high-pressure separators * **Chemical Processing:** Reactors and pressure vessels handling corrosive media at elevated temperatures * **Oil & Gas Industry:** Heat exchangers, transfer lines, and processing equipment **6. Key Characteristics & Advantages** * **Enhanced Mechanical Properties:** The normalized and tempered heat treatment provides improved strength and toughness compared to Class 1 * **Excellent High-Temperature Performance:** Maintains mechanical strength and resists creep at temperatures up to 580°C (1075°F) * **Superior Oxidation Resistance:** 9% chromium content provides excellent resistance to scaling and oxidation in high-temperature environments * **Good Weldability:** Can be successfully welded using appropriate procedures including pre-heating and post-weld heat treatment * **Hydrogen Attack Resistance:** Suitable for service in hydrogen-containing environments as per Nelson Curve requirements **7. Heat Treatment Requirements** Grade 9 Class 2 undergoes specific heat treatment: * **Normalizing:** Typically performed at 925-980°C (1700-1800°F) * **Tempering:** Conducted at 675-750°C (1250-1380°F) * **Post-Weld Heat Treatment (PWHT):** Required after welding, typically at 675-750°C (1250-1380°F) In summary, **ASTM A387 Grade 9 Class 2** represents the heat-treated version of the 9Cr-1Mo alloy, offering enhanced mechanical properties for more demanding pressure vessel applications while maintaining excellent high-temperature performance and corrosion resistance. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 9, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4378 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 9, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel, Grade 9, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel, Grade 9, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel, Grade 9, 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 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 849 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