ASTM A618 HSLA Steel Wire Grade III

ASTM A618 HSLA Steel Wire Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Product Information -:- For detailed product information, please contact sales. -: ASTM A618 HSLA Steel Wire Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A618 HSLA Steel Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A618 HSLA Steel Grade III, 19-38 mm Thickness** **ASTM A618 Grade III** is a high-strength low-alloy (HSLA) structural steel plate supplied in the heat-treated (quenched and tempered) condition. It is specifically designed for welded, riveted, or bolted construction of bridges and buildings, offering an excellent combination of high strength, good toughness, and superior weldability. This grade is the highest strength level within the ASTM A618 specification. The thickness range of **19 to 38 mm (3/4 to 1.5 inches)** is commonly used in critical, load-bearing components where reducing weight without compromising strength or durability is a key requirement. --- #### **1. Key International Standards** * **Primary Standard:** **ASTM A618 / A618M** - Standard Specification for Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing. * *Note: While this standard is for tubing, the steel plates (like Grade III) used to manufacture that tubing are a widely recognized and specified product in their own right for general construction.* * **Alternative/Equivalent Standards:** * **ASTM A572 / A572M:** Grade 50 [345] is a common alternative, but A618 Grade III offers higher strength. * **EN 10025-4:** S460N / S460NL (Normalized) can be considered a European equivalent in terms of strength and application. * **ISO 4950:** Grades with similar yield strength levels. --- #### **2. Chemical Composition (Heat Analysis)** The chemical composition is carefully controlled to achieve the desired mechanical properties and enhance weldability. The following table represents the maximum percentages by weight. | Element | Composition (%) | Notes | | :--- | :--- | :--- | | **Carbon (C)** | 0.23 max | Controlled for weldability and formability. | | **Manganese (Mn)** | 1.35 max | Increases strength and hardenability. | | **Phosphorus (P)** | 0.04 max | Impurity, kept low to improve toughness. | | **Sulfur (S)** | 0.05 max | Impurity, kept low to improve weldability and ductility. | | **Silicon (Si)** | 0.30 max | Deoxidizing agent, contributes to strength. | | **Copper (Cu)** | 0.20 min* | *Minimum required. Enhances atmospheric corrosion resistance. | | **Vanadium (V)** | 0.01 - 0.15 | Key microalloying element that provides precipitation strengthening. | | **Columbium (Cb)** | 0.01 - 0.15 | Key microalloying element that provides grain refinement and precipitation strengthening. | *Note: The combination of Vanadium and Columbium (Niobium) is a hallmark of this grade, allowing it to achieve high strength through controlled rolling and heat treatment.* --- #### **3. Mechanical & Physical Properties** The following properties are typical for plates in the **19 mm to 38 mm (0.75 in to 1.5 in)** thickness range. **Mechanical Properties:** | Property | Value | Unit | | :--- | :--- | :--- | | **Yield Strength (min)** | 50 | ksi (345 MPa) | | **Tensile Strength** | 70 - 90 | ksi (483 - 621 MPa) | | **Elongation (in 2 in / 50 mm) (min)** | 18 - 21* | % | | **Modulus of Elasticity** | ~29,000 | ksi (~200 GPa) | | **Poisson's Ratio** | ~0.29 | - | *\*Elongation value is thickness-dependent; consult the standard for exact minimums.* **Physical Properties (Typical):** * **Density:** 0.284 lb/in³ (7850 kg/m³) * **Thermal Expansion Coefficient:** 6.5 x 10^-6 /°F (11.7 x 10^-6 /°C) at 68-212°F (20-100°C) * **Thermal Conductivity:** Approximately 28.5 W/m·K (at 100°C) --- #### **4. Product Applications** ASTM A618 Grade III plates in this thickness range are ideal for demanding structural applications where weight savings and high performance are critical: * **Bridge Construction:** Girders, main load-bearing members, and trusses in both highway and railway bridges. * **Building Structures:** Columns, beams, and trusses in high-rise buildings, industrial plants, and large commercial complexes. * **Off-Shore and Marine Structures:** Platforms, docks, and other structures requiring high strength-to-weight ratio and good toughness. * **Heavy-Duty Equipment:** Frames and booms for cranes, excavators, and other mining and construction machinery. * **Transmission Towers & Support Structures:** For electrical power lines and communication towers. --- #### **5. Key Advantages** * **High Strength-to-Weight Ratio:** Allows for lighter, more economical structures without sacrificing load-bearing capacity. * **Excellent Weldability:** The low carbon equivalent (typically ~0.40-0.45%) allows for welding without pre-heat in many thicknesses, though specific procedures should always be qualified. * **Good Toughness:** Provides reliable performance in low-temperature environments and under dynamic loading. * **Atmospheric Corrosion Resistance:** The minimum copper content offers better resistance to atmospheric corrosion compared to carbon steels. * **Fabricability:** Can be cut, formed, and drilled using standard industrial methods. **Disclaimer:** The information provided here is for general reference purposes. For critical applications, always consult the latest official ASTM A618 standard and engage with qualified materials engineers to ensure compliance with all project requirements. -:- For detailed product information, please contact sales. -: ASTM A618 HSLA Steel Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4494 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 III, Thickness 19 to 38 mm (3/4 to 1.5 in.) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A618 HSLA Steel Wire Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A618 HSLA Steel Wire Grade III, Thickness 19 to 38 mm (3/4 to 1.5 in.) -:- For detailed product information, please contact sales. -:

Packing of ASTM A618 HSLA Steel Wire Grade III, Thickness 19 to 38 mm (3/4 to 1.5 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 965 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