ASTM A553 Alloy Steel Flange, Grade II

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 A553 Alloy Steel Flange, Grade II Product Information -:- For detailed product information, please contact sales. -: ASTM A553 Alloy Steel Flange, Grade II Synonyms -:- For detailed product information, please contact sales. -:

ASTM A553 Alloy Steel, Grade II Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A553 Grade II: Enhanced Strength Quenched and Tempered 9% Nickel Steel Plate** #### **1. Overview** ASTM A553 Grade II is an **enhanced-strength quenched and tempered 9% nickel steel plate** specifically designed for **cryogenic pressure vessel applications** requiring superior mechanical properties at extremely low temperatures. This grade represents the higher strength level within the A553 specification, offering improved yield and tensile strength while maintaining exceptional notch toughness at temperatures as low as -320°F (-196°C). Grade II is particularly suitable for large LNG storage tanks and other critical cryogenic applications where both high strength and reliability are essential. #### **2. Chemical Composition** The chemical composition features enhanced nickel content for superior cryogenic performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.13 max | | Manganese (Mn) | 0.90 max | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.40 | | Nickel (Ni) | 8.50 - 9.50 | | Chromium (Cr) | 0.25 max | | Molybdenum (Mo) | 0.12 max | **Enhanced Composition Features:** - **Higher Nickel Content (8.50-9.50%)**: Provides improved strength and toughness at cryogenic temperatures - **Low Carbon Maximum**: Ensures excellent weldability and notch toughness - **Controlled Manganese**: Optimizes strength-toughness relationship - **Minimized Residual Elements**: Reduces potential for impairment of cryogenic properties #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 110 - 130 ksi (760 - 895 MPa) | | **Yield Strength** | 85 ksi min (585 MPa min) | | **Elongation in 2 inches** | 20% min | | **Charpy V-Notch Impact** | 25 ft-lb min at -320°F (-196°C) | **Superior Cryogenic Performance:** - **Enhanced Low-Temperature Toughness**: Maintains excellent impact properties at liquid natural gas temperatures - **Improved Strength Characteristics**: Higher yield and tensile strength compared to Grade I - **Stable Austenitic Microstructure**: Retains ductility and toughness at cryogenic conditions - **Excellent Fatigue Resistance**: Suitable for dynamic loading in cryogenic service **Physical Properties (Typical):** - **Density**: 0.287 lb/in³ (7,950 kg/m³) - **Modulus of Elasticity**: 28,500 ksi (197 GPa) at room temperature - **Thermal Expansion Coefficient**: 5.7 × 10⁻⁶/°F (10.3 × 10⁻⁶/°C) at -320°F to 68°F - **Thermal Conductivity**: 12.3 W/m·K at -320°F (-196°C) - **Magnetic Permeability**: Typically less than 1.05 at cryogenic temperatures #### **4. Product Applications** Grade II is specified for demanding cryogenic applications requiring enhanced strength: **Large-Scale LNG Infrastructure:** - Large-capacity LNG storage tanks - LNG carrier containment systems - LNG processing plant equipment - LNG export terminal components **Industrial Gas Production:** - Large liquid nitrogen and oxygen storage vessels - Cryogenic air separation units - Industrial gas production facilities - Bulk cryogenic liquid storage **Advanced Cryogenic Systems:** - High-capacity cryogenic storage facilities - Advanced research cryostats - Superconducting magnet containers - Space application cryogenic tanks #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-4** | X8Ni9 | Enhanced strength variant | | **Europe** | **EN 10028-4** | X8Ni9 | Cryogenic nickel steel | | **Japan** | **JIS G3127** | SL9N590 | 9% nickel steel equivalent | | **Germany** | **DIN 17280** | X8Ni9 | Premium cryogenic steel | **Grade Comparison within A553:** | Parameter | Grade I | Grade II | |-----------|---------|----------| | **Nickel Content** | 8.00-9.00% | 8.50-9.50% | | **Yield Strength Minimum** | 75 ksi | 85 ksi | | **Tensile Strength Range** | 100-120 ksi | 110-130 ksi | | **Typical Applications** | Standard Cryogenic Vessels | Enhanced Cryogenic Applications | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heat requirement**: Generally not required due to metallurgical characteristics - **Post-weld heat treatment**: Usually not specified to preserve cryogenic properties - **Welding consumables**: High-nickel content electrodes (typically 60-70% Ni) - **Welding processes**: SMAW, GTAW, GMAW with proper procedure qualification **Heat Treatment:** - **Double Normalizing and Tempering**: Standard thermal processing - **Normalizing temperature**: 1475-1525°F (802-829°C) - **Tempering temperature**: 1050-1150°F (566-621°C) - **Quenching**: Water quenching from normalizing temperature **Quality Control Requirements:** - **Impact testing**: Mandatory at -320°F (-196°C) for each heat - **Tension tests**: From each heat treatment charge - **Ultrasonic examination**: Required for pressure vessel quality plates - **Hardness testing**: Typically 210-250 HBW --- **Technical Advantages:** - **Enhanced strength** while maintaining cryogenic toughness - **Excellent weldability** without pre-heat requirements - **Proven performance** in large-scale LNG applications - **Superior fracture toughness** at extreme low temperatures **Design Considerations:** - **ASME Section VIII Division 2** design methodology applicable - **Cryogenic service** capability to -320°F (-196°C) - **Fracture mechanics design** essential for large structures - **Thermal stress analysis** critical for design integrity **Service Limitations and Guidelines:** - **Minimum design temperature**: -320°F (-196°C) - **Maximum service temperature**: 500°F (260°C) - **Corrosion protection**: Required for certain environments - **Quality verification**: Enhanced testing for critical applications **Disclaimer:** This technical information is for reference purposes only. For cryogenic pressure vessel applications, particularly for LNG service, consult the latest ASTM A553 specification and applicable ASME Code requirements. Material selection, fabrication, and testing must be approved by qualified engineers with specific experience in cryogenic applications and must comply with all relevant regulatory standards, including those specific to LNG facilities. -:- For detailed product information, please contact sales. -: ASTM A553 Alloy Steel, Grade II Specification Dimensions Size： Diameter 20-1000 mm Length <4461 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 A553 Alloy Steel, Grade II Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A553 Alloy Steel Flange, Grade II -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A553 Alloy Steel Flange, Grade II -:- For detailed product information, please contact sales. -:

Packing of ASTM A553 Alloy Steel Flange, Grade II -:- 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 932 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