ASTM A387 Alloy Steel, Grade 9, Class 1

ASTM A387 Alloy Steel, Grade 9, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 9, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 9, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387/A387M Alloy Steel, Grade 9, Class 1** **1. Overview** ASTM A387 Grade 9 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate designed for service in welded pressure vessels and other high-temperature applications. This intermediate-grade alloy offers a balanced combination of high-temperature strength, resistance to oxidation, and improved corrosion resistance compared to carbon steels and lower-grade Cr-Mo steels. The "Class 1" designation indicates the material is supplied in the as-rolled or normalized condition, providing good strength for a wide range of elevated temperature services. **2. Key International Standards** * **Primary Standard:** **ASTM A387/A387M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum. * This standard defines the chemical, mechanical, and heat treatment requirements. * **Dimensional & General Requirements:** * **ASTM A20/A20M** - Standard Specification for General Requirements for Steel Plates for Pressure Vessels. This provides supplementary requirements for testing, inspection, and tolerances. * **Equivalent Standards:** * **EN / DIN:** 12CrMo9-10 (A comparable European grade). * **JIS:** SCMV 26 (Japanese standard for Cr-Mo steel for pressure vessels). * **ASME:** SA-387 Gr. 9 Cl. 1 (The ASME code case version). **3. Chemical Composition (Weight %)** The chemical composition is carefully balanced to provide the required mechanical properties and high-temperature performance. | 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 9% Chromium content is a key differentiator from lower grades like Grade 2 or Grade 5, providing enhanced oxidation resistance.* **4. Mechanical & Physical Properties** The mechanical properties for Class 1 are typically met in the as-rolled or normalized condition. **Mechanical Properties (at room temperature):** | Property | Value | | :--- | :--- | | Tensile Strength | 415 - 585 MPa (60 - 85 ksi) | | Yield Strength (min) | 205 MPa (30 ksi) | | Elongation in 2 in. (50 mm), (min) | 20% | | **Hardness (typical)** | **~130-180 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 x 10⁶ psi) * **Thermal Conductivity:** ~ 30.0 W/m·K (at 100°C) * **Coefficient of Thermal Expansion:** ~ 11.0 x 10⁻⁶ /K (20-100°C) *Note: Physical properties, especially modulus of elasticity and thermal conductivity, are temperature-dependent and should be verified for specific design calculations.* **5. Product Applications** ASTM A387 Gr 9 Cl 1 is widely used in pressure vessel components that operate at elevated temperatures where resistance to oxidation and hydrogen attack is required. * **Petroleum Refining:** Hydrotreating reactors, catalytic reformers, and high-pressure heat exchangers. * **Power Generation:** Boiler shells, steam drums, and high-temperature piping systems. * **Chemical & Petrochemical Plants:** Reactors and vessels exposed to corrosive process streams at elevated temperatures. * **Oil & Gas Industry:** Equipment for gas processing and synthesis applications. **6. Key Characteristics & Advantages** * **Good High-Temperature Strength:** Maintains strength and resists creep at temperatures up to approximately 580°C (1075°F). * **Excellent Oxidation Resistance:** The 9% Chromium content provides significantly better resistance to scaling and oxidation in steam and flue gas environments compared to lower-chromium steels. * **Resistance to Hydrogen Attack:** Suitable for service in high-pressure hydrogen environments as per the Nelson Curve (API RP 941). * **Weldability:** It possesses fair weldability but requires strict adherence to welding procedures, including pre-heating and Post-Weld Heat Treatment (PWHT), to prevent cracking and ensure the integrity of the weldment. In summary, **ASTM A387 Grade 9 Class 1** is a versatile and widely used intermediate chromium-molybdenum alloy steel plate. It serves as a critical material for pressure vessels and components operating in high-temperature and mildly corrosive environments, bridging the performance gap between low-alloy steels and more advanced grades like Grade 91. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 9, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4377 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 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel, Grade 9, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel, Grade 9, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel, Grade 9, Class 1 -:- 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 848 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