ASTM A203 Low Alloy Steel Flange, Grade B

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 A203 Low Alloy Steel Flange, Grade B Product Information -:- For detailed product information, please contact sales. -: ASTM A203 Low Alloy Steel Flange, Grade B Synonyms -:- For detailed product information, please contact sales. -:

ASTM A203 Low Alloy Steel, Grade B Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A203 Grade B Steel** **ASTM A203 Grade B** is a nickel-alloy steel plate designed for pressure vessel applications requiring superior low-temperature toughness. With a nominal **2.25% nickel** content, this grade offers enhanced mechanical properties and improved impact resistance at cryogenic temperatures compared to Grade A, making it suitable for more demanding low-temperature service conditions. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A203/A203M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Nickel" **Grade Classification:** - **Grade B** - 2.25% nickel steel with enhanced properties - Other grades: A, D, E, F with varying nickel content and properties **International Equivalents:** - **EN 10028-4**: 12Ni14 - **JIS G3127**: SLA 235A - **GB/T 3531**: 09MnNiDR - **ISO 9328-4**: 12Ni14 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A203 Grade B: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.21 | | Manganese (Mn) | 0.70 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.30 | | Nickel (Ni) | 2.10-2.50 | **Key Composition Features:** - **Nickel Content**: 2.10-2.50% for enhanced low-temperature toughness - **Controlled Carbon**: Slightly higher than Grade A for improved strength - **Manganese Optimization**: Maintains good strength-toughness balance - **Low Silicon Content**: Preserves excellent impact properties --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 485-620 MPa (70-90 ksi) | | **Yield Strength (min.)** | 275 MPa (40 ksi) | | **Elongation in 2" (min.)** | 22% | | **Elongation in 8" (min.)** | 25% | **Low-Temperature Toughness Properties:** - **Charpy V-Notch Test Temperature**: -75°F (-59°C) - **Minimum Impact Energy**: 20 ft-lbf (27 J) - **Enhanced Toughness**: Improved low-temperature performance over Grade A **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 49.0 W/m·K - **Coefficient of Thermal Expansion**: 11.5 × 10⁻⁶/°C - **Specific Heat Capacity**: 478 J/kg·K --- #### **4. Product Applications** **Cryogenic Pressure Vessels:** - LNG storage and transportation tanks - Liquid ethylene containers - Cryogenic processing vessels - Low-temperature storage systems **Chemical and Petrochemical:** - Ethylene oxide reactors - Propylene storage vessels - Low-temperature distillation columns - Chemical process equipment **Energy Sector:** - Cryogenic energy storage systems - LNG regasification equipment - Cold energy recovery systems - Specialized power plant components **Industrial Applications:** - Industrial gas production equipment - Cryogenic research vessels - Specialized cooling systems - Low-temperature testing equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Excellent Weldability**: With nickel-compatible filler metals - **Preheat Requirements**: 175-225°F (80-107°C) recommended - **Post-Weld Heat Treatment**: Stress relieving at 1100-1200°F (595-650°C) - **Recommended Processes**: GTAW, GMAW, SMAW (low-hydrogen) - **Filler Metals**: ENiCrFe-3, ERNiCr-3 or equivalent **Forming & Machining:** - **Good Formability**: Suitable for cold forming operations - **Machinability**: Good (approximately 60% of B1112 steel) - **Cutting Methods**: Plasma, waterjet, and laser cutting preferred - **Bend Performance**: Excellent for cryogenic applications **Heat Treatment:** - Typically supplied in normalized condition - Normalizing temperature: 1550-1650°F (845-900°C) - Optional tempering for specific property requirements - Microstructural stability maintained **Quality Assurance:** - **Mandatory Impact Testing**: Charpy V-Notch at -75°F (-59°C) - **Chemical Analysis**: Full heat certification - **Mechanical Testing**: Comprehensive property verification - **Non-Destructive Testing**: UT, RT, MT as required --- ### **Technical Summary** ASTM A203 Grade B represents an enhanced version of the 2.25% nickel steel series, offering improved mechanical properties and low-temperature performance compared to Grade A. The material's optimized chemistry provides higher strength while maintaining excellent toughness at cryogenic temperatures down to -75°F (-59°C). The nickel content plays a crucial role in lowering the ductile-to-brittle transition temperature, making this grade particularly valuable for applications involving liquefied gases and cryogenic fluids. The enhanced strength properties (40 ksi minimum yield strength) allow for more efficient vessel designs while maintaining the safety margins required for low-temperature service. This grade demonstrates excellent performance in fabricated structures, with good weldability and formability characteristics that facilitate manufacturing of complex pressure vessel components. The material's consistent response to heat treatment and reliable mechanical properties make it a preferred choice for engineers designing equipment for the LNG industry, chemical processing, and cryogenic storage applications. ASTM A203 Grade B has established itself as a reliable and cost-effective solution for moderate cryogenic applications, bridging the gap between carbon steels and higher nickel alloys. Its proven service history in critical low-temperature applications, combined with its fabrication versatility, ensures continued preference among pressure vessel designers and fabricators worldwide. -:- For detailed product information, please contact sales. -: ASTM A203 Low Alloy Steel, Grade B Specification Dimensions Size： Diameter 20-1000 mm Length <4332 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 A203 Low Alloy Steel, Grade B Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A203 Low Alloy Steel Flange, Grade B -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A203 Low Alloy Steel Flange, Grade B -:- For detailed product information, please contact sales. -:

Packing of ASTM A203 Low Alloy Steel Flange, Grade B -:- 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 803 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