ASTM A618 HSLA Steel Flange Grade Ib

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

ASTM A618 HSLA Steel Grade Ib, Thickness < 19 mm (3/4 in.) Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A618 Grade Ib: Hot-Formed Welded High Strength Low-Alloy Structural Steel Tubing (Thickness < 19 mm / ¾ in.)** #### **1. Overview** ASTM A618 Grade Ib is a specification for **hot-formed welded high strength low-alloy (HSLA) structural steel tubing** with **superior atmospheric corrosion resistance**, designed for thicknesses less than 19 mm (¾ inch). This weathering steel develops a dense, adherent protective oxide patina when exposed to atmospheric conditions, providing approximately **four times better corrosion resistance** than conventional carbon steel. Grade Ib offers an excellent balance of strength, durability, and aesthetic appeal for structural tubular applications in exposed environments. #### **2. Chemical Composition** The chemical composition is precisely controlled for enhanced corrosion resistance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.22 max | | Manganese (Mn) | 0.75 - 1.25 | | Phosphorus (P) | 0.04 max | | Sulfur (S) | 0.05 max | | Silicon (Si) | 0.15 - 0.50 | | Copper (Cu) | 0.20 - 0.40 | | Chromium (Cr) | 0.40 - 0.70 | | Nickel (Ni) | 0.25 - 0.50 | **Enhanced Composition Features:** - **Optimized Copper-Chromium-Nickel System**: Creates superior protective patina formation - **Controlled Carbon Content**: Maintains excellent weldability for tubular structures - **Enhanced Nickel Content**: Improves overall corrosion resistance and toughness - **Balanced Silicon Level**: Ensures good strength while maintaining formability #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thickness < 19 mm / ¾ in.):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 70 ksi min (485 MPa min) | | **Yield Strength** | 50 ksi min (345 MPa min) | | **Elongation in 2 inches** | 22% min | | **Bend Test** | Bend 180° around diameter equal to thickness | **Superior Performance Characteristics:** - **Enhanced Atmospheric Corrosion Resistance**: 4x better than carbon steel without copper - **High Strength-to-Weight Ratio**: Enables lightweight structural designs - **Excellent Weldability**: All standard welding processes applicable - **Good Cold Forming Capability**: Suitable for moderate fabrication requirements **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**: 42.5 W/m·K at 212°F (100°C) #### **4. Product Applications** Grade Ib finds extensive use in demanding structural tubular applications: **Architectural and Building Structures:** - Architectural exposed structural columns - Building facade support systems - Monumental structural elements - High-end architectural features **Bridge and Infrastructure:** - Bridge structural members and trusses - Highway sign support structures - Pedestrian bridge components - Transportation infrastructure elements **Industrial and Special Applications:** - Industrial platform structural frames - Material handling system supports - Special equipment structural components - Heavy-duty structural frameworks #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 4952** | E460D | Weathering steel equivalent | | **Europe** | **EN 10219** | S355J2H | Hollow structural sections | | **Japan** | **JIS G3475** | STKN 400B | High-strength carbon steel tubes | | **China** | **GB/T 6728** | Q355GNH | Weathering steel hollow sections | **A618 Grade Ib Special Characteristics:** | Parameter | Grade Ia | Grade Ib | |-----------|----------|----------| | **Corrosion Resistance** | 2x Carbon Steel | 4x Carbon Steel | | **Nickel Content** | 0.25% max | 0.25-0.50% | | **Typical Applications** | General Structural | Enhanced Performance | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication Requirements:** - **Pre-heat Requirements**: 250-400°F (120-205°C) based on section thickness - **Welding Processes**: GMAW, FCAW, GTAW with low-hydrogen consumables - **Interpass Control**: Maximum 400°F (205°C) - **Post-Weld Treatment**: Generally not required for thin sections **Tubing Manufacturing Quality:** - **Hot-Forming Process**: Ensures uniform mechanical properties - **Weld Integrity**: Full penetration welds with consistent quality - **Dimensional Accuracy**: Tight tolerances for structural applications - **Surface Quality**: Suitable for weathering characteristics development **Corrosion Performance Features:** - **Rapid Patina Formation**: Develops within 1-3 years in proper conditions - **Self-Protecting Mechanism**: Eliminates need for protective coatings - **Environmental Versatility**: Performs well in various atmospheric conditions - **Low Maintenance**: Minimal upkeep after patina establishment **Quality Control Protocols:** - **Comprehensive Testing**: Tension, bend, and flattening tests - **Chemical Verification**: Strict control of alloying elements - **Dimensional Inspection**: Precise measurement of tubular sections - **Surface Quality Assessment**: Visual and non-destructive examination --- **Technical Advantages:** - **Superior corrosion protection** in exposed environments - **Excellent strength-to-weight ratio** for efficient designs - **Aesthetically pleasing weathered appearance** - **Reduced lifecycle costs** through eliminated maintenance **Design Considerations:** - **Optimize section designs** for weathering performance - **Ensure proper drainage** in tubular configurations - **Select compatible connection** methods and materials - **Consider environmental factors** in design calculations **Service Limitations:** - **Not suitable** for continuous immersion conditions - **Avoid crevice corrosion** traps in designs - **Limited performance** in severe marine environments - **Maximum service temperature** of 750°F (400°C) **Disclaimer:** This technical information serves as a reference guide. For structural applications employing A618 Grade Ib steel tubing, consultation with the latest ASTM A618 specification and relevant structural design codes is essential. All fabrication must adhere to established procedures for weathering steel tubular structures, and designs require approval by qualified professional engineers experienced with hollow structural sections and weathering steel performance characteristics. -:- For detailed product information, please contact sales. -: ASTM A618 HSLA Steel Grade Ib, Thickness < 19 mm (3/4 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4489 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 Ib, Thickness < 19 mm (3/4 in.) Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A618 HSLA Steel Flange Grade Ib, Thickness < 19 mm (3/4 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 960 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