ASTM A572 Steel Flange, grade 55

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 A572 Steel Flange, grade 55 Product Information -:- For detailed product information, please contact sales. -: ASTM A572 Steel Flange, grade 55 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A572 Steel, grade 55 Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A572 / A572M Grade 55 Steel** **Product Overview** ASTM A572 Grade 55 is a **high-strength low-alloy (HSLA) structural steel** representing the intermediate strength tier between the ubiquitous Grade 50 and higher-strength grades like 60 and 65. Strengthened via **columbium (niobium) or vanadium microalloying**, it offers a guaranteed **minimum yield strength of 55 ksi (380 MPa)**, providing approximately 10% greater load capacity than Grade 50 for applications where optimized material efficiency or higher design stresses are required. This grade combines the excellent weldability and fabricability characteristic of the A572 series with enhanced strength, making it suitable for weight-sensitive structures and heavily loaded components where Grade 50 may result in overly bulky sections. It is available in plates, structural shapes, and bars. **Key International Standards** * **Primary Standard:** **ASTM A572 / A572M** - Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel. * **Governing Specification:** This product conforms to all requirements for **Grade 55**. * **Microalloying System:** Achieves its increased strength through controlled additions of **Columbium (Cb/Nb)**, **Vanadium (V)**, or a combination, promoting fine grain refinement and precipitation strengthening. * **Heat Treatment:** Typically supplied in the **as-rolled** condition for shapes and bars. For plates, especially in thicker sections, **normalizing** may be employed to ensure uniform through-thickness properties and toughness. * **Related Standards:** Serves a similar market role as **JIS G3106 SM520** and **EN 10025-2 S420NL** (for normalized material). It is a common choice in applications where the next step up from Grade 50 is needed without moving to quenched and tempered steels. **Chemical Composition (Weight % - ASTM A572 Grade 55 Requirements)** Chemistry is controlled to achieve higher strength while maintaining good weldability, with slightly elevated carbon and manganese compared to Grade 50. | Element | Requirement (Max, unless noted) | Purpose & Note | | :--- | :--- | :--- | | **Carbon (C)** | 0.25% | Slightly higher than Gr. 50 for increased strength. | | **Manganese (Mn)** | 1.35% | Solid solution strengthening. | | **Phosphorus (P)** | 0.04% | Impurity control. | | **Sulfur (S)** | 0.05% | Impurity control. | | **Silicon (Si)** | 0.40% | Deoxidizer. | | **Columbium (Cb/Nb)** | 0.05% Max (if added) | Primary grain refiner. | | **Vanadium (V)** | 0.15% Max (if added) | Precipitation strengthener. | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.40 - 0.48, indicating **good weldability with proper procedures**. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A572 Grade 55) | Typical Performance & Significance | | :--- | :--- | :--- | | **Yield Strength (Min)** | 55 ksi (380 MPa) | Typically 58 - 68 ksi (400 - 470 MPa) | | **Tensile Strength** | 70 ksi (485 MPa) min | Typically 75 - 85 ksi (517 - 586 MPa) | | **Elongation in 2" (Min)** | 20% | Maintains good ductility. | | **Yield-to-Tensile Ratio** | Not specified in A572. | Typically 0.77 - 0.82. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | Standard for steel. | | **Atmospheric Corrosion Resistance** | ~2x carbon steel (if Cu ≥ 0.20% specified). | Optional feature. | | **Key Feature** | **Enhanced Strength with Proven Fabricability:** Provides a meaningful 10% strength increase over the standard Grade 50 while retaining the reliable microalloyed metallurgy and generally good weldability of the A572 family, ideal for optimizing structural efficiency. | **Product Applications** ASTM A572 Grade 55 is specified where structural efficiency and higher load capacity are critical, often in demanding or weight-sensitive structures. * **Heavy Industrial & Process Plant Structures:** Columns, beams, and bracing in facilities with heavy dynamic loads or large open spans. * **Bridge Construction:** Heavily loaded girders, pier caps, and splice plates in medium to long-span bridges. * **Material Handling & Mining Equipment:** Booms, frames, and structural components for large cranes, excavators, and haul trucks where weight reduction improves performance. * **Power Generation Structures:** Support frames, turbine pedestals, and heavy-duty platforms. * **Transportation:** Components for heavy-haul trailers, railcar bolster beams, and specialized vehicle frames. * **High-Rise Building Construction:** For lower-story columns or transfer girders where higher strength reduces member size. **Advantages & Fabrication Notes** * **Good Weldability with Procedure Control:** The carbon equivalent is manageable but requires more attention than Grade 50. * **Preheat:** **Recommended** for most thicknesses, especially for restrained joints. Typical range is **150-300°F (66-149°C)** as per AWS D1.1 recommendations for 55 ksi material. * **Low-Hydrogen Practice:** Essential. Use of E70XX or E80XX low-hydrogen electrodes. * **Heat Input Control:** Moderate control is advised to preserve toughness in the Heat-Affected Zone (HAZ). * **Good Formability:** Capable of cold bending, but may require larger bend radii than Grade 50 due to its higher strength. Hot forming is also an option. * **Excellent Strength-to-Weight Ratio:** Enables lighter, more efficient designs compared to Grade 50, potentially reducing material tonnage and foundation costs. * **Toughness Considerations:** For applications requiring guaranteed toughness (e.g., dynamic loading, low temperatures), supplementary impact testing (**ASTM A6 S1**) should be specified. **Disclaimer:** This datasheet describes **ASTM A572 Grade 55**. For procurement, specify the **standard (A572), grade (55), product form**, and any supplementary requirements. **Important Considerations:** 1. **Not a Direct Replacement for Grade 50:** Design values and connection details must be recalculated for the higher strength. 2. **Welding Procedures:** Welding Procedure Specifications (WPS) should be qualified for the specific Grade 55 material being used. Do not assume procedures qualified for Grade 50 are automatically sufficient. 3. **Availability:** While widely available, it may have longer lead times or be produced to order compared to the mass-produced Grade 50. 4. **Alternative for Shapes:** For structural shapes, check availability as some mills may produce Grade 50 (or A992) and Grade 60 more routinely than Grade 55. 5. **Normalized Plates:** For plate thicknesses over 1.5 inches, specify normalized condition if required for uniform through-thickness properties. This grade is a practical and cost-effective step between Grade 50 and the quenched & tempered or higher-alloy grades, offering a balanced solution for many demanding structural applications. -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 55 Specification Dimensions Size： Diameter 20-1000 mm Length <4718 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 A572 Steel, grade 55 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A572 Steel Flange, grade 55 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A572 Steel Flange, grade 55 -:- For detailed product information, please contact sales. -:

Packing of ASTM A572 Steel Flange, grade 55 -:- 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 1189 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