ASTM A441 Steel

ASTM A441 Steel, 19-38 mm thick Product Information -:- For detailed product information, please contact sales. -: ASTM A441 Steel, 19-38 mm thick Synonyms -:- For detailed product information, please contact sales. -:

ASTM A441 Steel, 19-38 mm thick Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A441 Steel Plate (19-38 mm thick)** **Product Overview** ASTM A441 is a **historical high-strength, low-alloy (HSLA) structural steel** that incorporates **vanadium or vanadium-nitrogen** as a primary strengthening element. Designed for applications requiring higher strength and improved atmospheric corrosion resistance compared to standard carbon steel, it offered a minimum yield strength of 345 MPa (50 ksi) in the 19-38 mm thickness range. ASTM A441 represented an intermediate step in steel technology, using microalloying to achieve better properties than plain carbon-manganese steels like A440, but has since been **largely superseded** by more advanced and consistent grades such as **ASTM A572**. Its production was typically in the **as-rolled or normalized** condition. **Key International Standards** * **Primary Standard:** **ASTM A441 / A441M** - Standard Specification for High-Strength Low-Alloy Structural Manganese Vanadium Steel. * **Status:** **Discontinued / Superseded.** This standard was officially withdrawn in 1998 and replaced by **ASTM A572**. * **Direct Modern Equivalent:** **ASTM A572 Grade 50** is the designated successor. A572 offers similar strength with more precise microalloy control (using columbium/niobium and/or vanadium) and enhanced property guarantees. * **Legacy Distinction:** A441 was often confused with weathering steels. While it contained copper and could offer some corrosion resistance, it was **not** a guaranteed "weathering steel" like **ASTM A242** or **A588**. It was primarily a strength-driven grade. * **Heat Treatment:** Typically supplied in the **as-rolled** condition, though normalization could be specified. **Chemical Composition (Weight % - Historical ASTM A441 Requirements)** The key feature was the intentional addition of vanadium for grain refinement and precipitation strengthening. | Element | Typical ASTM A441 Requirement (Max, unless noted) | Purpose & Comparison | | :--- | :--- | :--- | | **Carbon (C)** | 0.22% | Base strength; lower than A440 for better weldability. | | **Manganese (Mn)** | 0.85 - 1.25% | Solid solution strengthening and hardenability. | | **Phosphorus (P)** | 0.04% | Higher than modern limits. | | **Sulfur (S)** | 0.05% | Higher than modern limits. | | **Silicon (Si)** | 0.30% max | Deoxidizer. | | **Vanadium (V)** | **0.02% min** | **Key Alloy:** Grain refiner and precipitation strengthener. | | **Copper (Cu)** | 0.20% min (when specified) | Optional for atmospheric corrosion resistance, but not guaranteed. | | **Carbon Equivalent (C.E. IIW)** | -- | Moderate; better than A440 but not as optimized as A572. | **Physical & Mechanical Properties (For thickness 19-38 mm / 3/4" to 1-1/2")** | Property | Requirement (ASTM A441) | Context & Modern Comparison | | :--- | :--- | :--- | | **Yield Strength (Min)** | 345 MPa (50 ksi) | Same as modern A572 Grade 50. | | **Tensile Strength** | 483 MPa (70 ksi) min | Same minimum as A572 Grade 50. | | **Elongation in 50mm (Min)** | 18% (for plates) | Standard ductility requirement. | | **Yield-to-Tensile Ratio (Max)** | Not Specified | A572 often controls this for improved seismic performance. | | **Charpy V-Notch Toughness** | **Not a standard requirement.** | A critical deficiency. Modern A572 can be easily specified with supplemental impact testing (ASTM A6 S1). | | **Atmospheric Corrosion Resistance** | **Optional, not guaranteed.** If Cu ≥ 0.20%, may offer ~2x A36, but not certified. | Distinct from true weathering steels (A242/A588) which guarantee performance. | | **Key Feature** | **Transitional Vanadium-Strengthened Steel:** Pioneered the use of microalloying (V) for economical strength increase in structural shapes and plates, but lacked the toughness guarantees and refined production controls of its successor, A572. | **Product Applications (Historical Context & Modern Replacement)** A441 was historically used in structures where a 50 ksi yield strength was beneficial, often in exposed applications where some corrosion resistance was hoped for but not rigorously designed around. * **Bridge Construction:** Girders, floorbeams, and bracing members. * **Building Structures:** Columns, beams, and trusses in industrial and commercial buildings. * **Transmission Towers and Heavy Equipment Support Frames.** * **Marine and Harbor Structures (non-immersed).** * **Modern Context:** All these applications are now served by **ASTM A572 Grade 50** (for strength) or **ASTM A588 Grade 50** (for guaranteed weathering performance). **Advantages & Fabrication Notes (Historical Perspective)** * **Advantage at the Time:** Provided better strength-to-weight ratio and slightly improved weldability over A440 due to lower carbon content and vanadium grain refinement. * **Weldability:** Superior to A440 but still required care. The moderate carbon and manganese levels necessitate standard low-hydrogen welding practices and preheat for thicker sections or restrained joints. * **Toughness Limitations:** The lack of mandatory impact testing was its major weakness. Fracture toughness, particularly in thicker sections, plate edges (sheared or thermally cut), and the heat-affected zone (HAZ) of welds, could be inconsistent. This makes it unsuitable by modern standards for fracture-critical or dynamically loaded structures. * **Formability:** Adequate for typical structural bending and forming. * **Why It Was Replaced:** **ASTM A572** standardized and improved upon the microalloying concept. A572 offers: * More consistent chemistry and properties. * Ability to guarantee toughness through supplementary requirements. * Better control over yield-to-tensile ratio. * Clearer differentiation from weathering steel grades. **Disclaimer:** **This datasheet describes an obsolete material, ASTM A441, for historical reference only. It must not be specified for new construction.** 1. **For Existing Structures:** If investigating or repairing a structure containing A441, assume **no guaranteed toughness** and **no certified corrosion resistance**. Material testing is recommended. 2. **Replacement & Repair:** For new components or repairs, specify **ASTM A572 Grade 50** for general strength applications or **ASTM A588 Grade 50** if atmospheric corrosion resistance is required. Substitution requires engineering approval. 3. **Welding on Existing Material:** Assume moderate weldability. Use low-hydrogen procedures, apply preheat per code requirements for 50 ksi yield steel, and consider the potential for variable HAZ properties. 4. **Design Values:** Do not assume modern design values or performance characteristics without verification based on actual material testing. Consultation with a structural engineer experienced in the evaluation and upgrade of existing steel structures is essential when dealing with this legacy grade. -:- For detailed product information, please contact sales. -: ASTM A441 Steel, 19-38 mm thick Specification Dimensions Size： Diameter 20-1000 mm Length <4711 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 A441 Steel, 19-38 mm thick Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A441 Steel, 19-38 mm thick -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A441 Steel, 19-38 mm thick -:- For detailed product information, please contact sales. -:

Packing of ASTM A441 Steel, 19-38 mm thick -:- 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 1182 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