ASTM A387 Alloy Steel Flange, Grade 22, Class 2

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Flange, Grade 22, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Flange, Grade 22, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 22, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 22 Class 2 Steel** **ASTM A387 Grade 22 Class 2** is a premium chromium-molybdenum alloy steel plate supplied in the normalized and tempered condition, offering enhanced mechanical properties for the most demanding high-temperature pressure vessel applications. This class provides superior strength and microstructural stability for severe service conditions requiring maximum performance. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A387/A387M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum" **Grade Classification:** - **Grade 22** - 2.25% Chromium - 1.0% Molybdenum alloy steel - **Class 2** - Normalized and tempered condition **International Equivalents:** - **EN 10028-2**: 10CrMo9-10 - **JIS G4109**: SCMV 4 - **GB/T 3077**: 12Cr2Mo1 - **ISO 9328-2**: 10CrMo9-10 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A387 Grade 22 Class 2: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.05-0.15 | | Manganese (Mn) | 0.30-0.60 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.50 | | Chromium (Cr) | 2.00-2.50 | | Molybdenum (Mo) | 0.90-1.10 | **Key Composition Features:** - **Optimized Chromium**: 2.00-2.50% for superior high-temperature corrosion resistance - **Enhanced Molybdenum**: 0.90-1.10% for maximum creep strength and temper resistance - **Precise Carbon Control**: 0.05-0.15% for optimal strength-toughness balance in normalized condition - **Restricted Manganese**: 0.30-0.60% for improved high-temperature stability and toughness --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Class 2 condition):** | Property | Value | |---|---| | **Tensile Strength** | 585-760 MPa (85-110 ksi) | | **Yield Strength (min.)** | 380 MPa (55 ksi) | | **Elongation in 2" (min.)** | 16% | | **Elongation in 8" (min.)** | 18% | **Enhanced Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 595°C (1100°F) - **Creep Rupture Strength**: Superior long-term performance under sustained loading - **Oxidation Resistance**: Excellent performance in high-temperature oxidizing atmospheres - **Hydrogen Attack Resistance**: Suitable for high-pressure hydrogen service up to 595°C **Physical Properties:** - **Density**: 7.87 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 205 GPa (29,700 ksi) - **Thermal Conductivity**: 42.5 W/m·K - **Coefficient of Thermal Expansion**: 11.5 × 10⁻⁶/°C - **Specific Heat Capacity**: 460 J/kg·K --- #### **4. Product Applications** **Critical High-Temperature Service:** - Hydrocracking reactor vessels - High-pressure hydrogen vessels and reactors - Catalytic reforming reactors - Severe service pressure containers for refinery applications **Advanced Power Generation:** - High-pressure boiler drums and headers - High-temperature steam piping systems - Advanced heat exchanger systems for power plants - High-pressure turbine casings and components **Petrochemical Processing:** - Hydrodesulfurization reactors - High-pressure synthesis vessels - Severe service process equipment in refineries - High-temperature high-pressure separation vessels **Specialized Applications:** - Nuclear power plant secondary system components - Advanced energy conversion systems - High-pressure high-temperature (HPHT) process equipment - Special chemical processing vessels for corrosive services --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Controlled Weldability**: Requires qualified welding procedures and strict parameter control - **Preheat Requirements**: 200-300°C (400-575°F) mandatory for all thicknesses - **Post-Weld Heat Treatment**: Essential at 690-730°C (1275-1350°F) with precise temperature control - **Recommended Processes**: GTAW, SMAW with strict low-hydrogen control - **Filler Metals**: E9015-B3, ER90S-B3 or equivalent high-purity electrodes **Forming & Machining:** - **Limited Formability**: Hot forming essential for all significant deformation operations - **Machinability**: Poor (approximately 45% of B1112 steel) requiring specialized tooling - **Cutting Methods**: Waterjet and laser cutting preferred to maintain material properties - **Hot Working Range**: 1050-1150°C (1920-2100°F) with careful temperature control **Heat Treatment:** - Supplied in normalized and tempered condition - Normalizing temperature: 900-940°C (1650-1725°F) - Tempering temperature: 675-705°C (1250-1300°F) - Microstructure: Fine bainitic structure with optimal carbide distribution **Quality Assurance:** - **Enhanced Testing Protocol**: Multiple test locations through thickness required - **Comprehensive Impact Testing**: Stringent toughness requirements at specified temperatures - **Advanced NDT**: Full ultrasonic examination typically required for critical applications - **Metallurgical Verification**: Microstructure and grain size evaluation to ensure proper heat treatment --- ### **Technical Summary** ASTM A387 Grade 22 Class 2 represents the premium grade in the 2.25Cr-1Mo alloy steel series, offering the highest strength level combined with exceptional high-temperature performance. The normalized and tempered heat treatment produces an optimal fine-grained bainitic microstructure that provides outstanding creep strength, thermal stability, and resistance to high-temperature corrosion. With a minimum yield strength of 55 ksi (380 MPa), Class 2 offers approximately 20% higher strength than Class 1, enabling more efficient designs for high-pressure applications while maintaining excellent elevated temperature capabilities. The 2.25% chromium content provides superior resistance to oxidation and sulfidation, making it particularly suitable for refining and petrochemical applications where both high temperature and corrosive environments are encountered. This grade demonstrates exceptional performance in hydrogen service at elevated temperatures, where its composition provides inherent resistance to hydrogen attack and high-temperature hydrogen damage. The material's proven reliability in hydrocracking reactors, hydrogen processing vessels, and other severe service applications has established it as the material of choice for the most demanding pressure vessel applications in the energy and petrochemical sectors. While requiring the most stringent fabrication controls and comprehensive quality assurance measures, Grade 22 Class 2 delivers unmatched performance in critical high-temperature, high-pressure service conditions. Its ability to maintain mechanical integrity under extreme operating conditions makes it indispensable for advanced energy systems, petrochemical processing, and other applications where safety, reliability, and long-term performance are paramount considerations in material selection. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 22, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4369 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 22, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel Flange, Grade 22, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Flange, Grade 22, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Flange, Grade 22, 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 Flange 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 840 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