ASTM A572 Steel Wire, grade 45

ASTM A572 Steel Wire, grade 45 Product Information -:- For detailed product information, please contact sales. -: ASTM A572 Steel Wire, grade 45 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A572 Steel, grade 45 Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A572 / A572M Grade 45 Steel** **Product Overview** ASTM A572 Grade 45 is a **high-strength low-alloy (HSLA) structural steel** strengthened primarily through **columbium (niobium) or vanadium microalloying**. It offers a guaranteed **minimum yield strength of 45 ksi (310 MPa)** along with excellent weldability and improved atmospheric corrosion resistance compared to plain carbon steels. As a versatile and economical alternative to ASTM A36, Grade 45 provides approximately 25% higher yield strength, enabling lighter, more efficient structural designs while maintaining good fabricability. It is produced to precise chemical and mechanical property requirements and is available in plates, bars, and structural shapes in various heat-treated conditions. **Key International Standards** * **Primary Standard:** **ASTM A572 / A572M** - Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel. * **Governing Specification:** This product conforms to all requirements for **Grade 45**. * **Microalloying System:** Achieves strength via fine grain refinement and precipitation strengthening from controlled additions of **Columbium (Cb/Nb)** or **Vanadium (V)**, or a combination of both. * **Heat Treatment:** Typically supplied in the **as-rolled** condition for shapes and bars, and **as-rolled, normalized, or stress-relieved** for plates, depending on thickness and producer practice. * **Related Standards:** Widely accepted in international specifications. Comparable to **JIS G3141 SPFC 45** and aligns with the performance requirements of **EN 10025-4 S355N/NL** for normalized material. **Chemical Composition (Weight % - ASTM A572 Grade 45 Requirements)** Chemistry is tightly controlled to ensure consistent performance and weldability. | Element | Requirement (Max, unless noted) | Purpose & Note | | :--- | :--- | :--- | | **Carbon (C)** | 0.26% | Controlled for weldability. | | **Manganese (Mn)** | 1.35% | Solid solution strengthening. | | **Phosphorus (P)** | 0.04% | Impurity control. | | **Sulfur (S)** | 0.05% | Impurity control. | | **Silicon (Si)** | 0.40% | Deoxidizer. | | **Columbium (Cb/Nb)** | 0.05% Max (if added) | Primary microalloy for grain refinement. | | **Vanadium (V)** | 0.15% Max (if added) | Alternative/co-microalloy for precipitation strengthening. | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.40 - 0.46, indicating good weldability. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A572 Grade 45) | Typical Performance / Notes | | :--- | :--- | :--- | | **Yield Strength (Min)** | 45 ksi (310 MPa) | Typically 50 - 60 ksi (345 - 414 MPa) | | **Tensile Strength** | 60 ksi (415 MPa) min | Typically 65 - 75 ksi (448 - 517 MPa) | | **Elongation in 2" (Min)** | 21% | Good ductility for forming. | | **Yield-to-Tensile Ratio** | Not specified, but favorable. | Typically 0.70 - 0.80. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | Standard for steel. | | **Atmospheric Corrosion Resistance** | Approximately **2x that of carbon steel (A36)** due to Cu content (0.20% min when specified). | Optional but common. | | **Key Feature** | **Optimized Microalloyed Value Grade:** Delivers a reliable 45 ksi yield point with superior consistency, weldability, and toughness compared to older carbon-manganese grades like A440/A441, thanks to modern microalloying technology. | **Product Applications** ASTM A572 Grade 45 is a preferred material for a wide range of structural applications where enhanced performance over A36 is desired. * **Building Construction:** Columns, beams, trusses, and base plates in commercial and industrial buildings. * **Bridge Construction:** Girders, floor beams, and secondary members. * **Transmission & Communication Towers:** Lattice structures and poles. * **Heavy Equipment:** Frames, booms, and structural members for agricultural and construction machinery. * **Transportation:** Truck frames, trailer components, and railcar structures. * **General Fabrication:** For any component where upgrading from A36 allows for weight savings or increased load capacity. **Advantages & Fabrication Notes** * **Excellent Weldability:** The controlled carbon content and microalloying result in a moderate carbon equivalent. Standard welding processes (SMAW, GMAW, FCAW) with low-hydrogen practices are suitable. Preheating is generally not required for thin to moderate sections under normal conditions. * **Good Formability & Toughness:** The fine-grained microstructure provides good cold bending characteristics and better notch toughness than equivalent-strength carbon steels. * **Cost-Effective Strength:** Provides a significant strength increase over A36 at a minimal cost premium, offering excellent value in structural design. * **Consistent Properties:** Microalloying ensures uniform mechanical properties and fine grain size, leading to predictable performance in fabrication and service. * **Surface & Condition:** Available in standard mill finishes. Plates can be specified as normalized for thicker sections to ensure through-thickness properties. **Disclaimer:** This datasheet describes **ASTM A572 Grade 45**, a modern, widely available HSLA steel. For procurement, specify the **standard (A572), grade (45), product form (plate, bar, shape)**, and any supplementary requirements such as **impact testing (ASTM A6 S1)** or **fine austenitic grain practice (ASTM A6 S5)** if needed for low-temperature service or critical applications. This grade has largely replaced older grades like A440 and A441 for new construction. Always confirm with the supplier the available delivery conditions (as-rolled vs. normalized) for plates, as this can affect properties in thicker sections. Design values should be taken from the appropriate governing code (e.g., AISC Manual). -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 45 Specification Dimensions Size： Diameter 20-1000 mm Length <4716 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 A572 Steel, grade 45 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A572 Steel Wire, grade 45 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A572 Steel Wire, grade 45 -:- For detailed product information, please contact sales. -:

Packing of ASTM A572 Steel Wire, grade 45 -:- 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 1187 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