ASTM A588 HSLA Steel Grade K

ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (4 in.) Product Information -:- For detailed product information, please contact sales. -: ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (4 in.) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (4 in.) Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A588 Grade K: High-Strength Low-Alloy Structural Steel (Thickness < 100 mm / 4 in.)** #### **1. Overview** ASTM A588 Grade K is a **high-strength low-alloy structural steel** known for its **exceptional atmospheric corrosion resistance** and **enhanced mechanical properties**. In thicknesses under 100 mm (4 inches), this grade offers a minimum yield strength of 50 ksi (345 MPa) while providing approximately **four times better corrosion resistance** than conventional carbon steel. Grade K features a unique chemical composition with specific alloying elements that make it particularly suitable for welded, bolted, or riveted constructions in demanding environmental conditions. #### **2. Chemical Composition** The chemical composition is carefully balanced for optimal performance: | Element | Composition (%) | |---------|-----------------| | Carbon (C) | 0.12 max | | Manganese (Mn) | 0.50 - 0.90 | | Phosphorus (P) | 0.025 max | | Sulfur (S) | 0.025 max | | Silicon (Si) | 0.25 - 0.50 | | Copper (Cu) | 0.20 - 0.40 | | Chromium (Cr) | 0.40 - 0.65 | | Nickel (Ni) | 0.25 - 0.50 | | Molybdenum (Mo) | 0.05 - 0.15 | **Key Composition Features:** - **Molybdenum Addition (0.05-0.15%)**: Enhances strength and corrosion resistance - **Low Carbon Content**: Ensures excellent weldability and toughness - **Optimized Manganese Range**: Provides good hardenability control - **Copper-Chromium-Nickel System**: Creates superior atmospheric corrosion protection #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thickness ≤ 100 mm / 4 in.):** | Property | Requirement | |----------|-------------| | **Tensile Strength** | 70 ksi min (485 MPa min) | | **Yield Strength** | 50 ksi min (345 MPa min) | | **Elongation in 2 inches** | 21% min | | **Charpy V-Notch Impact** | 20 ft-lb min at +70°F (21°C) | **Enhanced Performance Characteristics:** - **Superior Atmospheric Corrosion Resistance**: Forms dense, adherent protective patina - **Excellent Strength-to-Weight Ratio**: Enables lighter, more economical structures - **Enhanced Weldability**: All standard welding processes applicable with proper procedures - **Good Low-Temperature Toughness**: Maintains adequate impact properties **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 K is extensively used in structural applications requiring enhanced durability: **Bridge Construction:** - Highway and railway bridge components - Bridge girders and deck systems - Pedestrian bridge structures - Bridge railings and support systems **Architectural Structures:** - Exposed building frameworks and facades - Architectural features and monumental structures - Public building components - Outdoor structural elements **Industrial Applications:** - Industrial plant structural members - Material handling equipment frames - Support structures in moderate corrosive environments - Industrial framework components #### **5. International Standards & Equivalents** | Region/Country | Standard | Equivalent Grade | Notes | |----------------|----------|------------------|-------| | **International** | **ISO 4952** | E460D | Weathering steel equivalent | | **Europe** | **EN 10025-5** | S355J0W | Weathering structural steel | | **Japan** | **JIS G3125** | SPA-H | High weathering resistance steel | | **China** | **GB/T 4171** | Q355GNH | Weathering structural steel | **A588 Grade K Special Characteristics:** | Feature | Advantage | |---------|-----------| | **Molybdenum Addition** | Enhanced strength and corrosion resistance | | **Low Carbon Content** | Superior weldability and toughness | | **Balanced Alloy System** | Consistent performance in various environments | | **Weathering Properties** | Reduced maintenance requirements | #### **6. Fabrication & Quality Assurance** **Welding and Fabrication:** - **Pre-heat Requirements**: 200-400°F (95-205°C) depending on thickness - **Welding Processes**: SMAW, GMAW, FCAW, SAW all applicable - **Consumables**: Low-hydrogen electrodes recommended - **Interpass Temperature**: Maximum 400°F (205°C) **Corrosion Performance:** - **Protective Patina Formation**: Develops within 2-4 years of exposure - **Self-Protecting Mechanism**: Eliminates painting requirements after patina formation - **Environmental Adaptation**: Performs well in various atmospheric conditions - **Initial Weathering**: Controlled rusting during patina development **Quality Control Requirements:** - **Tension Tests**: From each heat or 50 tons of material - **Chemical Analysis**: For each heat of steel - **Impact Tests**: When specified by purchaser - **Surface Quality**: Free from injurious defects --- **Technical Advantages:** - **Enhanced corrosion resistance** through molybdenum addition - **Excellent weldability** due to controlled carbon content - **High strength-to-weight ratio** for economical designs - **Reduced maintenance** costs through weathering properties **Design Considerations:** - **Proper drainage design** to prevent water accumulation - **Compatible connection** details with other materials - **Environmental assessment** for corrosion performance optimization - **Aesthetic considerations** for patina development in visible applications **Service Limitations:** - **Not recommended** for continuous immersion service - **Avoid contact** with absorbent materials - **Special considerations** needed for severe marine environments - **Temperature limit**: 750°F (400°C) for structural applications **Disclaimer:** This technical information is for reference purposes only. For structural applications using A588 Grade K steel, consult the latest ASTM specification and applicable building codes. All designs must consider local environmental conditions and be approved by qualified professional engineers. Fabrication should follow established procedures for weathering steels to ensure optimal performance and long-term durability. -:- For detailed product information, please contact sales. -: ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (4 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4477 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 K, Thickness < 100 mm (4 in.) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (4 in.) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (4 in.) -:- For detailed product information, please contact sales. -:

Packing of ASTM A588 HSLA Steel Grade K, Thickness < 100 mm (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 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 948 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