ASTM A588 HSLA Steel Flange Grade D

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 A588 HSLA Steel Flange Grade D, Thickness 125 to 200 mm (5-8 in.) Product Information -:- For detailed product information, please contact sales. -: ASTM A588 HSLA Steel Flange Grade D, Thickness 125 to 200 mm (5-8 in.) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A588 HSLA Steel Grade D, Thickness 125 to 200 mm (5-8 in.) Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A588 Grade D: High-Strength Low-Alloy Structural Steel (Thickness 125-200 mm / 5-8 in.)** #### **1. Overview** ASTM A588 Grade D is a **high-strength low-alloy structural steel** in the very thick plate category (125-200 mm / 5-8 inches), specifically engineered for **heavy structural applications** requiring exceptional atmospheric corrosion resistance. This weathering steel, characterized by its unique phosphorus-enhanced composition, develops a dense, adherent protective oxide patina when exposed to corrosive environments, providing approximately **four times better corrosion resistance** than conventional carbon steels. Grade D maintains reliable performance in massive structural components while delivering superior durability in aggressive industrial and marine atmospheres. #### **2. Chemical Composition** The chemical composition is optimized for heavy section performance and maximum corrosion resistance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.10 - 0.19 | | Manganese (Mn) | 0.90 - 1.25 | | Phosphorus (P) | 0.04 - 0.12 | | Sulfur (S) | 0.05 max | | Silicon (Si) | 0.15 - 0.30 | | Copper (Cu) | 0.25 - 0.40 | | Chromium (Cr) | 0.30 - 0.50 | | Nickel (Ni) | 0.25 - 0.50 | | Vanadium (V) | 0.01 - 0.10 | **Heavy Section Composition Features:** - **Phosphorus Enhancement System (0.04-0.12%)**: Provides maximum corrosion protection in thick sections - **Vanadium Strengthening**: Ensures effective precipitation hardening throughout thickness - **Optimized Alloy Balance**: Maintains consistent through-thickness corrosion resistance - **Enhanced Copper-Nickel**: Creates synergistic protection in severe environments #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thickness 125-200 mm / 5-8 in.):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 63 ksi min (435 MPa min) | | **Yield Strength** | 42 ksi min (290 MPa min) | | **Elongation in 2 inches** | 21% min | | **Charpy V-Notch Impact** | 20 ft-lb min at +70°F (21°C) | **Thickness-Dependent Characteristics:** - **Controlled Strength Reduction**: Properly calibrated for structural design - **Maintained Ductility**: Consistent elongation performance across thickness range - **Enhanced Z-Direction Properties**: Reduced risk of lamellar tearing - **Superior Corrosion Performance**: Phosphorus effectiveness maintained in very thick sections **Physical Properties (Typical):** - **Density**: 0.284 lb/in³ (7,850 kg/m³) - **Modulus of Elasticity**: 29,000 ksi (200 GPa) - **Poisson's Ratio**: 0.29 - **Coefficient of Thermal Expansion**: 6.5 × 10⁻⁶/°F (11.7 × 10⁻⁶/°C) - **Thermal Conductivity**: 41.0 W/m·K at 212°F (100°C) #### **4. Product Applications** Grade D in 125-200 mm thickness is specified for massive structural applications in corrosive environments: **Major Marine Structures:** - Coastal mega-bridge main girders and towers - Heavy harbor and port facility components - Marine terminal primary structural elements - Coastal defense and protection structures **Heavy Industrial Complexes:** - Chemical plant primary support frameworks - Heavy industrial facility main structures - Pollution control equipment massive supports - Industrial complex primary building components **Critical Infrastructure:** - Major highway bridges in severe corrosive environments - Coastal railway bridge heavy components - Critical urban infrastructure in aggressive atmospheres - Heavy transportation structures in de-icing salt regions #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 4952** | E460D | Heavy section weathering steel | | **Europe** | **EN 10025-5** | S355J2WP | Phosphorus-enhanced weathering steel | | **Japan** | **JIS G3125** | SPA-H | High weathering resistance steel | | **China** | **GB/T 4171** | Q355GNHP | Phosphorus-containing weathering steel | **A588 Grade D Property Progression:** | Thickness Range | Yield Strength min | Tensile Strength min | Strength Reduction | Corrosion Performance | |-----------------|-------------------|---------------------|-------------------|---------------------| | **100-125 mm** | 46 ksi (315 MPa) | 67 ksi (460 MPa) | 8% | Superior | | **125-200 mm** | 42 ksi (290 MPa) | 63 ksi (435 MPa) | 16% | Superior | | **200-300 mm** | 40 ksi (275 MPa) | 60 ksi (415 MPa) | 20% | Superior | #### **6. Fabrication & Quality Assurance** **Advanced Welding Technology:** - **Mandatory Pre-heat**: 350-550°F (175-290°C) based on exact thickness - **Special Welding Procedures**: Critical due to phosphorus content in thick sections - **Welding Processes**: SAW and FCAW preferred for heavy fabrications - **Consumables**: High-toughness, low-hydrogen electrodes required **Special Fabrication Requirements:** - **Thermal Cutting**: Pre-heat to 350-450°F (175-230°C) mandatory - **Stress Relieving**: Often specified for complex heavy fabrications - **Non-Destructive Testing**: Extensive UT and RT requirements - **Handling Systems**: Heavy-duty equipment and specialized rigging **Enhanced Quality Assurance:** - **Multiple Tension Tests**: From various locations and orientations - **Ultrasonic Examination**: 100% scanning typically required - **Z-Direction Testing**: Mandatory for critical applications - **Comprehensive Chemical Control**: Ensuring through-thickness consistency --- **Technical Advantages:** - **Exceptional corrosion resistance** maintained in very thick sections - **Superior performance** in severe marine and industrial environments - **Significant lifecycle cost savings** through eliminated painting - **Proven reliability** in international critical infrastructure projects **Design and Engineering Considerations:** - **Proper strength reduction** factors must be rigorously applied - **Thermal stress management** critical in very thick sections - **Heavy connection design** for optimal load transfer in corrosive environments - **Environmental assessment** essential for long-term performance **Service Performance:** - **Reliable patina development** even in very thick applications - **Consistent protection** across massive structural surfaces - **Structural monitoring** recommended for critical applications - **Minimal maintenance** requirements after protective patina establishment **Disclaimer:** This information represents specialized technical data for very thick plate applications in corrosive environments. For structural designs using 125-200 mm A588 Grade D steel, consultation with the latest ASTM specification and relevant structural codes is mandatory. Special attention must be given to welding procedures and fabrication techniques due to the enhanced phosphorus content in heavy sections. All fabrication must be performed by qualified specialists with experience in heavy steel construction in corrosive environments, and designs must be approved by professional structural engineers with expertise in heavy section weathering steel applications. -:- For detailed product information, please contact sales. -: ASTM A588 HSLA Steel Grade D, Thickness 125 to 200 mm (5-8 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4476 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 A588 HSLA Steel Grade D, Thickness 125 to 200 mm (5-8 in.) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A588 HSLA Steel Flange Grade D, Thickness 125 to 200 mm (5-8 in.) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A588 HSLA Steel Flange Grade D, Thickness 125 to 200 mm (5-8 in.) -:- For detailed product information, please contact sales. -:

Packing of ASTM A588 HSLA Steel Flange Grade D, Thickness 125 to 200 mm (5-8 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 947 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