ASTM A699 Steel Flange, 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 A699 Steel Flange, class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A699 Steel Flange, class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A699 Steel, class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A699 Steel, Class 2** **ASTM A699 Class 2** is a premium carbon steel plate specifically engineered for pressure vessel applications demanding superior low-temperature toughness and enhanced transition properties. As the higher-grade classification within the A699 specification, Class 2 offers improved impact resistance compared to Class 1, making it particularly suitable for critical low-temperature and cryogenic service where maximum resistance to brittle fracture is required. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A699/A699M** - "Standard Specification for Steel Plates, Carbon, for Pressure Vessels, Improved Transition Properties" **Classification:** - **Class 2** - Enhanced impact properties with stricter requirements - **Class 1** - Standard impact properties **International Equivalents:** - **EN 10028-3**: P275NL1 - **JIS G3115**: SGV 410 - **GB/T 3531**: 16MnDR - **ISO 9328-2**: P275NL1 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A699 Class 2: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.20 | | Manganese (Mn) | 0.70-1.00 | | Phosphorus (P) | 0.030 | | Sulfur (S) | 0.030 | | Silicon (Si) | 0.15-0.40 | | Copper (Cu) | 0.35 (when specified) | **Key Composition Features:** - **Strict Carbon Control**: Maximum 0.20% for optimal toughness - **Tighter Impurity Limits**: Reduced phosphorus and sulfur for improved purity - **Controlled Manganese**: Carefully balanced for strength and toughness - **Enhanced Silicon Range**: Provides consistent deoxidation --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses up to 2 inches/50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 450-530 MPa (65-77 ksi) | | **Yield Strength (min.)** | 275 MPa (40 ksi) | | **Elongation in 2" (min.)** | 24% | | **Elongation in 8" (min.)** | 27% | **Enhanced Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: -75°F (-60°C) - **Minimum Impact Energy**: 25 ft-lbf (34 J) average - **Individual Minimum**: 20 ft-lbf (27 J) - **Stricter Requirements**: Enhanced over Class 1 specifications **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 51.2 W/m·K - **Coefficient of Thermal Expansion**: 11.6 × 10⁻⁶/°C --- #### **4. Product Applications** **Critical Pressure Vessels:** - Deep cryogenic storage tanks - LNG processing and storage vessels - Liquid nitrogen/oxygen containers - Ultra-low temperature reactors **Chemical and Petrochemical:** - Low-temperature process vessels - Cryogenic reactor systems - Chemical storage at extreme temperatures - Specialized processing equipment **Energy Sector:** - Cryogenic energy storage systems - LNG power plant components - Advanced heat exchanger systems - Specialized power generation equipment **Aerospace and Defense:** - Rocket fuel storage vessels - Aerospace cryogenic systems - Defense equipment pressure vessels - Space exploration systems **Specialized Industrial:** - Industrial gas production equipment - Superconducting system components - Research laboratory vessels - Advanced cryogenic applications --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Excellent Weldability**: With proper procedure control - **Preheat Guidelines**: 150-200°F (65-95°C) for thicker sections - **Recommended Processes**: GTAW, GMAW, SMAW (low-hydrogen) - **Filler Metals**: E7018, ER70S-6 with strict control **Forming & Machining:** - **Superior Formability**: Excellent for complex shapes - **Bend Radius**: Typically 1.0t for 90° bends - **Machinability**: Good (approximately 70% of B1112 steel) - **Surface Quality**: Excellent for critical applications **Heat Treatment:** - Typically supplied in normalized condition - Stress relieving recommended for complex fabrications - Controlled cooling processes employed **Quality Assurance:** - Enhanced Charpy V-Notch testing requirements - Multiple test locations with stricter criteria - Full traceability and certification - Additional non-destructive testing as specified --- ### **Technical Summary** ASTM A699 Class 2 represents the premium grade in carbon steel plates for pressure vessels requiring exceptional low-temperature toughness. With enhanced impact properties tested at -75°F (-60°C) and stricter chemical controls, this classification provides superior performance in the most demanding cryogenic and low-temperature applications. The material's optimized chemistry and manufacturing processes ensure reliable resistance to brittle fracture, making it the material of choice for critical applications in LNG storage, aerospace cryogenics, and advanced industrial gas processing. The enhanced purity levels and controlled microstructure contribute to its exceptional low-temperature characteristics. While maintaining the same strength levels as Class 1, Class 2 offers significantly improved toughness properties, providing engineers with an additional safety margin for critical applications. The material's excellent fabrication characteristics, combined with its certified enhanced impact properties, make it an ideal choice for pressure vessels operating in extreme low-temperature environments where reliability and safety are paramount considerations. -:- For detailed product information, please contact sales. -: ASTM A699 Steel, class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4312 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 A699 Steel, class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A699 Steel Flange, class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A699 Steel Flange, class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A699 Steel Flange, 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 783 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