ASTM A618 HSLA Steel Flange Grade III

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 A618 HSLA Steel Flange Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Product Information -:- For detailed product information, please contact sales. -: ASTM A618 HSLA Steel Flange Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A618 HSLA Steel Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A618 HSLA Steel Grade III, 19-38 mm Thickness** **ASTM A618 Grade III** is a high-strength low-alloy (HSLA) structural steel plate supplied in the heat-treated (quenched and tempered) condition. It is specifically designed for welded, riveted, or bolted construction of bridges and buildings, offering an excellent combination of high strength, good toughness, and superior weldability. This grade is the highest strength level within the ASTM A618 specification. The thickness range of **19 to 38 mm (3/4 to 1.5 inches)** is commonly used in critical, load-bearing components where reducing weight without compromising strength or durability is a key requirement. --- #### **1. Key International Standards** * **Primary Standard:** **ASTM A618 / A618M** - Standard Specification for Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing. * *Note: While this standard is for tubing, the steel plates (like Grade III) used to manufacture that tubing are a widely recognized and specified product in their own right for general construction.* * **Alternative/Equivalent Standards:** * **ASTM A572 / A572M:** Grade 50 [345] is a common alternative, but A618 Grade III offers higher strength. * **EN 10025-4:** S460N / S460NL (Normalized) can be considered a European equivalent in terms of strength and application. * **ISO 4950:** Grades with similar yield strength levels. --- #### **2. Chemical Composition (Heat Analysis)** The chemical composition is carefully controlled to achieve the desired mechanical properties and enhance weldability. The following table represents the maximum percentages by weight. | Element | Composition (%) | Notes | | :--- | :--- | :--- | | **Carbon (C)** | 0.23 max | Controlled for weldability and formability. | | **Manganese (Mn)** | 1.35 max | Increases strength and hardenability. | | **Phosphorus (P)** | 0.04 max | Impurity, kept low to improve toughness. | | **Sulfur (S)** | 0.05 max | Impurity, kept low to improve weldability and ductility. | | **Silicon (Si)** | 0.30 max | Deoxidizing agent, contributes to strength. | | **Copper (Cu)** | 0.20 min* | *Minimum required. Enhances atmospheric corrosion resistance. | | **Vanadium (V)** | 0.01 - 0.15 | Key microalloying element that provides precipitation strengthening. | | **Columbium (Cb)** | 0.01 - 0.15 | Key microalloying element that provides grain refinement and precipitation strengthening. | *Note: The combination of Vanadium and Columbium (Niobium) is a hallmark of this grade, allowing it to achieve high strength through controlled rolling and heat treatment.* --- #### **3. Mechanical & Physical Properties** The following properties are typical for plates in the **19 mm to 38 mm (0.75 in to 1.5 in)** thickness range. **Mechanical Properties:** | Property | Value | Unit | | :--- | :--- | :--- | | **Yield Strength (min)** | 50 | ksi (345 MPa) | | **Tensile Strength** | 70 - 90 | ksi (483 - 621 MPa) | | **Elongation (in 2 in / 50 mm) (min)** | 18 - 21* | % | | **Modulus of Elasticity** | ~29,000 | ksi (~200 GPa) | | **Poisson's Ratio** | ~0.29 | - | *\*Elongation value is thickness-dependent; consult the standard for exact minimums.* **Physical Properties (Typical):** * **Density:** 0.284 lb/in³ (7850 kg/m³) * **Thermal Expansion Coefficient:** 6.5 x 10^-6 /°F (11.7 x 10^-6 /°C) at 68-212°F (20-100°C) * **Thermal Conductivity:** Approximately 28.5 W/m·K (at 100°C) --- #### **4. Product Applications** ASTM A618 Grade III plates in this thickness range are ideal for demanding structural applications where weight savings and high performance are critical: * **Bridge Construction:** Girders, main load-bearing members, and trusses in both highway and railway bridges. * **Building Structures:** Columns, beams, and trusses in high-rise buildings, industrial plants, and large commercial complexes. * **Off-Shore and Marine Structures:** Platforms, docks, and other structures requiring high strength-to-weight ratio and good toughness. * **Heavy-Duty Equipment:** Frames and booms for cranes, excavators, and other mining and construction machinery. * **Transmission Towers & Support Structures:** For electrical power lines and communication towers. --- #### **5. Key Advantages** * **High Strength-to-Weight Ratio:** Allows for lighter, more economical structures without sacrificing load-bearing capacity. * **Excellent Weldability:** The low carbon equivalent (typically ~0.40-0.45%) allows for welding without pre-heat in many thicknesses, though specific procedures should always be qualified. * **Good Toughness:** Provides reliable performance in low-temperature environments and under dynamic loading. * **Atmospheric Corrosion Resistance:** The minimum copper content offers better resistance to atmospheric corrosion compared to carbon steels. * **Fabricability:** Can be cut, formed, and drilled using standard industrial methods. **Disclaimer:** The information provided here is for general reference purposes. For critical applications, always consult the latest official ASTM A618 standard and engage with qualified materials engineers to ensure compliance with all project requirements. -:- For detailed product information, please contact sales. -: ASTM A618 HSLA Steel Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4494 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 A618 HSLA Steel Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A618 HSLA Steel Flange Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A618 HSLA Steel Flange Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) -:- For detailed product information, please contact sales. -:

Packing of ASTM A618 HSLA Steel Flange Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) -:- 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 965 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