ASTM A618 HSLA Steel Flange Grade Ia

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

ASTM A618 HSLA Steel Grade Ia, Thickness < 19 mm (3/4 in.) Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A618 Grade Ia: Hot-Formed Welded High Strength Low-Alloy Structural Steel Tubing (Thickness < 19 mm / ¾ in.)** #### **1. Overview** ASTM A618 Grade Ia is a specification for **hot-formed welded high strength low-alloy (HSLA) structural steel tubing** with **enhanced atmospheric corrosion resistance**, supplied in thicknesses less than 19 mm (¾ inch). This weathering steel develops a protective oxide patina when exposed to weather, providing approximately **two times better corrosion resistance** than carbon steel without copper. Grade Ia is specifically designed for structural applications where weight reduction, durability, and aesthetic appeal are important considerations. #### **2. Chemical Composition** The chemical composition is optimized for corrosion resistance and weldability: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.22 max | | Manganese (Mn) | 0.80 - 1.25 | | Phosphorus (P) | 0.04 max | | Sulfur (S) | 0.05 max | | Silicon (Si) | 0.30 - 0.65 | | Copper (Cu) | 0.20 - 0.40 | | Chromium (Cr) | 0.40 - 0.65 | | Nickel (Ni) | 0.25 max | **Key Composition Features:** - **Copper-Chromium System**: Forms protective patina for superior atmospheric corrosion resistance - **Controlled Carbon Content**: Ensures good weldability in tubular sections - **Manganese Enhancement**: Provides strength and toughness - **Silicon Addition**: Improves strength and corrosion resistance #### **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 | **Enhanced Performance Characteristics:** - **Superior Atmospheric Corrosion Resistance**: Forms dense, protective oxide layer - **High Strength-to-Weight Ratio**: Enables lighter, more economical structures - **Excellent Weldability**: Suitable for structural welding applications - **Good Formability**: Can be cold worked to moderate degrees **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**: 43.0 W/m·K at 212°F (100°C) #### **4. Product Applications** Grade Ia in thickness < 19 mm is used in structural tubular applications: **Architectural Structures:** - Exposed structural tubing for buildings - Architectural columns and supports - Curtain wall structural members - Monumental and sculptural structures **Bridge Construction:** - Bridge railings and parapets - Pedestrian bridge structural members - Light bridge support elements - Bridge aesthetic components **Industrial Applications:** - Industrial platform supports - Material handling system frames - Equipment support structures - Industrial stair and walkway systems #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 4952** | E460D | Weathering steel equivalent | | **Europe** | **EN 10219** | S355J0H | Hollow structural sections | | **Japan** | **JIS G3475** | STKN 400 | High-strength carbon steel tubes | | **China** | **GB/T 6728** | Q355 | Cold-formed steel hollow sections | **A618 Grade Comparison for Thickness < 19 mm:** | Grade | Yield Strength min | Tensile Strength min | Corrosion Resistance | |-------|-------------------|---------------------|---------------------| | **Grade Ia** | 50 ksi | 70 ksi | 2x Carbon Steel | | **Grade II** | 50 ksi | 70 ksi | 4x Carbon Steel | | **Grade III** | 50 ksi | 70 ksi | 5x Carbon Steel | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heat Requirements**: 200-350°F (95-175°C) depending on thickness - **Welding Processes**: GMAW, GTAW, SMAW all applicable - **Consumables**: Low-hydrogen electrodes recommended - **Interpass Temperature**: Maximum 400°F (205°C) **Tubing Manufacturing:** - **Hot-Forming Process**: Provides uniform mechanical properties - **Weld Quality**: Continuous welding with full penetration - **Dimensional Control**: Precise control of tubular dimensions - **Surface Preparation**: Suitable for weathering characteristics **Corrosion Performance:** - **Patina Formation**: Develops within 2-4 years of exposure - **Self-Protecting**: Eliminates painting requirements after patina formation - **Environmental Adaptation**: Performs well in various atmospheric conditions - **Initial Maintenance**: Temporary rust runoff management **Quality Control Requirements:** - **Tension Tests**: From each heat or lot - **Bend Tests**: Required to verify ductility - **Flattening Tests**: For tubular sections - **Surface Inspection**: Visual examination for defects --- **Technical Advantages:** - **Reduced maintenance** through weathering properties - **High strength-to-weight ratio** for efficient designs - **Aesthetically pleasing** natural weathered appearance - **Cost-effective** for exposed structural applications **Design Considerations:** - **Proper drainage design** to prevent water accumulation in tubular sections - **Connection details** compatible with weathering characteristics - **Environmental assessment** for corrosion performance - **Fabrication techniques** that preserve weathering properties **Service Limitations:** - **Not recommended** for continuous immersion service - **Avoid moisture traps** in tubular sections - **Chloride environments** may require special considerations - **Temperature limit**: 750°F (400°C) for structural applications **Disclaimer:** This technical information is for reference purposes only. For structural applications using A618 Grade Ia steel tubing, consult the latest ASTM A618 specification and applicable building codes. Proper design must consider local environmental conditions, and fabrication should follow established procedures for weathering steels. All structural designs must be approved by qualified professional engineers with experience in tubular structural design. -:- For detailed product information, please contact sales. -: ASTM A618 HSLA Steel Grade Ia, Thickness < 19 mm (3/4 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4488 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 Ia, Thickness < 19 mm (3/4 in.) Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A618 HSLA Steel Flange Grade Ia, 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 959 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