ASTM A302 Steel Flange, grade C

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 A302 Steel Flange, grade C Product Information -:- For detailed product information, please contact sales. -: ASTM A302 Steel Flange, grade C Synonyms -:- For detailed product information, please contact sales. -:

ASTM A302 Steel, grade C Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A302 / A302M Grade C Steel Plate** **Product Overview** ASTM A302 Grade C is a **manganese-molybdenum-nickel alloy steel plate** specifically engineered for **intermediate and higher temperature service** in welded pressure vessels. It is part of the high-strength, quenched and tempered (Q&T) alloy plate family, designed to provide superior mechanical properties and enhanced toughness compared to carbon steel plates like ASTM A515/A516. Grade C offers a higher strength level than Grades A and B within the A302 specification, making it suitable for thicker sections and more demanding pressure applications where weight reduction or higher design stresses are critical. Its alloy composition and heat treatment ensure good performance in both elevated temperature and low-temperature environments. **Key International Standards** * **Primary Standard:** **ASTM A302 / A302M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel. * **Governing Specification:** This product conforms to all requirements for **Grade C** as defined in ASTM A302. * **Heat Treatment Condition:** Supplied in the **quenched and tempered (Q&T) condition**. This is mandatory to achieve the specified strength, toughness, and homogeneity, especially in thicker plates. * **ASME Designation:** **SA-302 Grade C** - The ASME Boiler and Pressure Vessel Code designation, which is required for code-stamped pressure equipment. * **Related Standards:** Often compared to other Q&T pressure vessel steels like ASTM A517 (high-strength) and is the alloy-steel counterpart to normalized grades like ASTM A204 (molybdenum steel). **Chemical Composition (Weight % - ASTM A302 Grade C Requirements)** The chemistry is balanced for hardenability, strength, and toughness, utilizing manganese, molybdenum, and nickel. | Element | ASTM A302 Grade C Requirement | Typical Range / Aim | | :--- | :--- | :--- | | **Carbon (C)** | 0.20% max | 0.15 - 0.20% | | **Manganese (Mn)** | 1.15 - 1.50% | 1.25 - 1.45% | | **Phosphorus (P)** | 0.035% max | ≤ 0.020% | | **Sulfur (S)** | 0.040% max | ≤ 0.015% | | **Silicon (Si)** | 0.15 - 0.40% | 0.20 - 0.35% | | **Nickel (Ni)** | **0.40 - 0.70%** | 0.50 - 0.65% | | **Chromium (Cr)** | -- | ≤ 0.25% (residual) | | **Molybdenum (Mo)** | **0.45 - 0.60%** | 0.50 - 0.58% | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.50 - 0.58 | **Physical & Mechanical Properties** | Property | Requirement (ASTM A302 Grade C) | Typical Performance / Notes | | :--- | :--- | :--- | | **Tensile Strength** | 80 - 100 ksi (550 - 690 MPa) | 85 - 95 ksi (586 - 655 MPa) | | **Yield Strength (0.2% Offset)** | 50 ksi (345 MPa) min | 55 - 65 ksi (380 - 450 MPa) | | **Elongation in 2" (Min)** | 18% (for plates ≤ 3/4") | Typically 20-25% | | **Charpy V-Notch Toughness** | Often specified by purchaser per ASTM A20. | **Excellent.** The Q&T process and nickel content typically yield high impact values (e.g., 40-60 ft-lb) at low temperatures (e.g., -50°F / -46°C), making it suitable for low-temperature pressure vessels. | | **Maximum Recommended Metal Temperature** | -- | Suitable for intermediate temperature service, with ASME allowable stresses defined up to **~800°F (427°C)**. Strength retention at high temperature is better than carbon steel but inferior to chromium-molybdenum alloys. | | **Key Feature** | **High-Strength Q&T Alloy Plate:** Combines a 50 ksi minimum yield strength with the exceptional through-thickness toughness and homogeneity of a quenched and tempered alloy steel, ideal for high-integrity, thick-walled pressure vessels. | **Product Applications** ASTM A302 Grade C is specified for critical pressure vessel components requiring a combination of high strength, good toughness, and performance at moderate temperatures. * **Heavy-Wall Pressure Vessels:** Reactors, separators, and knock-out drums in the oil, gas, and petrochemical industries, especially for vessels with large diameters and high design pressures. * **Nuclear Components:** Certain non-critical structural supports and components in nuclear power plants. * **Hydrogenation Reactors:** Where good H₂ resistance and strength are needed. * **High-Pressure Storage Spheres and Drums.** * **Heat Exchanger Shells** for high-pressure service. * **Transition Pieces** between carbon steel and higher alloy sections. **Advantages & Fabrication Notes** * **Demanding Welding Requirements:** Due to its Q&T condition and alloy content, welding requires strict procedure control: * **Preheat & Interpass Control:** Mandatory. Typical preheat range is **300-400°F (149-204°C)** to prevent hydrogen-induced cracking. * **Low-Hydrogen Practice:** Essential. * **Post-Weld Heat Treatment (PWHT):** **Almost always required.** PWHT temperatures must be below the original tempering temperature (typically 1100-1200°F / 593-649°C) to avoid overtempering and strength loss. Procedure qualification is critical. * **Excellent Toughness:** The nickel addition significantly enhances low-temperature impact resistance, allowing its use in refrigerated pressure vessels (e.g., for liquefied gases) when impact-tested. * **Good Through-Thickness Properties:** The Q&T process ensures uniform properties, minimizing the strength gradient in thick plates. * **Formability:** Limited cold formability due to high strength. Hot forming is possible but must be followed by re-quenching and tempering. * **Code Compliance:** Fully recognized in the **ASME BPVC, Section II, Part D** with allowable stresses for both elevated and low-temperature design. **Disclaimer:** This datasheet provides general information on **ASTM A302 Grade C / SA-302 Grade C**. For procurement, specify the complete standard, grade (C), and required supplementary requirements (especially impact testing temperature and energy). **Design must be based on ASME BPVC allowable stress values.** Fabrication is complex and must be performed under a quality system compliant with codes like ASME Section VIII. Welding Procedure Specifications (WPS) must be qualified per ASME Section IX on representative material, including any required PWHT cycles. Material selection and all thermal processes must be approved by a qualified engineer or inspector familiar with Q&T alloy steels. -:- For detailed product information, please contact sales. -: ASTM A302 Steel, grade C Specification Dimensions Size： Diameter 20-1000 mm Length <4696 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 A302 Steel, grade C Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A302 Steel Flange, grade C -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A302 Steel Flange, grade C -:- For detailed product information, please contact sales. -:

Packing of ASTM A302 Steel Flange, grade C -:- 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 1167 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