ASTM A618 HSLA Steel Wire Grade Ia

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

Packing of ASTM A618 HSLA Steel Wire 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 Wire 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