ASTM A542 Low Alloy Steel Flange, Grade C, Class 1

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 A542 Low Alloy Steel Flange, Grade C, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel Flange, Grade C, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A542 Low Alloy Steel, Grade C, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A542 Grade C Class 1: High-Temperature 3Cr-1Mo Steel Plate** #### **1. Overview** ASTM A542 Grade C Class 1 is a **quenched and tempered 3% chromium-1% molybdenum alloy steel plate** designed for **superior high-temperature performance** in severe service applications. This grade represents a significant advancement over Grade B materials, offering enhanced resistance to high-temperature hydrogen attack, improved oxidation resistance, and superior creep strength, making it ideal for the most demanding refinery, petrochemical, and power generation applications. #### **2. Chemical Composition** The chemical composition is optimized for maximum high-temperature performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.15 max | | Manganese (Mn) | 0.30 - 0.60 | | Phosphorus (P) | 0.025 max | | Sulfur (S) | 0.025 max | | Silicon (Si) | 0.15 - 0.40 | | Chromium (Cr) | 2.75 - 3.25 | | Molybdenum (Mo) | 0.90 - 1.10 | **Enhanced Composition Features:** - **Higher Chromium Content (2.75-3.25%)**: Provides superior oxidation and corrosion resistance - **Enhanced Molybdenum (0.90-1.10%)**: Ensures excellent high-temperature strength and stability - **Controlled Carbon Content**: Maintains optimal weldability and toughness - **Balanced Manganese-Silicon**: Optimizes deoxidation and mechanical properties #### **3. Physical & Mechanical Properties** **Mechanical Properties (Quenched & Tempered Condition):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 75 - 95 ksi (515 - 655 MPa) | | **Yield Strength** | 45 ksi min (310 MPa min) | | **Elongation in 2 inches** | 18% min | | **Reduction of Area** | 45% min | | **Charpy V-Notch Impact** | 40 ft-lb min at -50°F (-46°C) | **Elevated Temperature Performance:** - **Exceptional Creep Strength**: Outstanding performance at temperatures up to 1200°F (650°C) - **Superior Hydrogen Resistance**: Enhanced resistance to hydrogen attack per API 941 - **Excellent Oxidation Resistance**: Superior performance in high-temperature environments - **Thermal Stability**: Maintains microstructural integrity during long-term exposure **Physical Properties (Typical):** - **Density**: 0.281 lb/in³ (7,780 kg/m³) - **Modulus of Elasticity**: 29,500 ksi (203 GPa) at 70°F (21°C) - **Thermal Expansion Coefficient**: 6.1 × 10⁻⁶/°F (11.0 × 10⁻⁶/°C) from 70-1000°F - **Thermal Conductivity**: 24.5 W/m·K at 212°F (100°C) #### **4. Product Applications** Grade C Class 1 is specified for advanced high-temperature hydrogen service applications: **Petroleum Refining:** - High-temperature hydrocracking reactors - Severe service hydrotreating vessels - Hydrogen reactors with elevated temperatures - Advanced refinery conversion units **Power Generation:** - High-temperature steam drums - Advanced boiler components - High-pressure piping systems - Critical heat exchanger applications **Chemical Processing:** - High-temperature chemical reactors - Synthesis gas converters - Severe service process vessels - Advanced petrochemical equipment #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 9328-2** | 12CrMo9-10 | Similar chromium-molybdenum steel | | **Europe** | **EN 10028-2** | 12CrMo9-10 | Close equivalent for pressure vessels | | **Japan** | **JIS G4109** | SCMV 4 | Chromium-molybdenum steel equivalent | | **Germany** | **DIN 17155** | 12CrMo910 | Historical designation | **Grade Comparison:** | Parameter | Grade B | Grade C | |-----------|---------|---------| | **Chromium Content** | 2.00-2.50% | 2.75-3.25% | | **Molybdenum Content** | 0.90-1.10% | 0.90-1.10% | | **Oxidation Resistance** | Very Good | Excellent | | **Maximum Service Temperature** | 1200°F (650°C) | 1250°F (675°C) | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heat requirement**: 300-400°F (150-200°C) minimum - **Post-weld heat treatment**: Mandatory at 1300-1400°F (705-760°C) - **Welding consumables**: Must match base metal composition - **Procedure qualification**: Essential for all welding operations **Heat Treatment Protocol:** - **Austenitizing**: 1650-1750°F (900-955°C) - **Quenching**: Accelerated cooling required - **Tempering**: 1300-1450°F (705-785°C) - **Microstructural requirements**: Fully tempered microstructure **Quality Control Requirements:** - **Impact testing**: Required at specified temperatures - **Tension tests**: From each heat treatment charge - **Ultrasonic examination**: Available as supplementary requirement - **Hardness testing**: Typically 180-220 HBW --- **Technical Advantages:** - **Enhanced high-temperature strength** - **Superior resistance to hydrogen attack** - **Excellent oxidation and corrosion resistance** - **Outstanding creep and rupture properties** **Design Considerations:** - **ASME Section VIII Division 1** design rules applicable - **Advanced creep life assessment** essential - **Hydrogen service evaluation** per API 941 - **Environmental factors** consideration **Service Limitations:** - **Maximum design temperature**: 1250°F (675°C) for continuous service - **Minimum design temperature**: -50°F (-46°C) based on impact requirements - **Hydrogen partial pressure limitations**: Per API 941 Nelson Curve - **Oxidation considerations**: Based on service environment **Disclaimer:** This information is for technical reference only. For high-temperature pressure vessel applications involving hydrogen service, consult the latest ASTM A542 specification and applicable ASME Code requirements. Material selection and fabrication must comply with API 941 recommendations and be approved by qualified engineers with experience in high-temperature hydrogen service applications. -:- For detailed product information, please contact sales. -: ASTM A542 Low Alloy Steel, Grade C, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4447 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 A542 Low Alloy Steel, Grade C, Class 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A542 Low Alloy Steel Flange, Grade C, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A542 Low Alloy Steel Flange, Grade C, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A542 Low Alloy Steel Flange, Grade C, 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 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 918 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