ASTM A572 Steel Seamless tube, grade 50

ASTM A572 Steel Seamless tube, grade 50 Product Information -:- For detailed product information, please contact sales. -: ASTM A572 Steel Seamless tube, grade 50 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A572 Steel, grade 50 Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A572 / A572M Grade 50 Steel** **Product Overview** ASTM A572 Grade 50 is a **high-strength low-alloy (HSLA) structural steel** that is the **industry standard** for modern construction requiring enhanced strength and reliability. Strengthened through **columbium (niobium) or vanadium microalloying**, it offers a guaranteed **minimum yield strength of 50 ksi (345 MPa)** alongside excellent weldability, improved toughness, and superior consistency compared to older carbon-manganese steels like A36 or A440. As the most commonly specified grade in the A572 family, Grade 50 provides approximately 40% higher yield strength than A36, enabling significant material savings, lighter structures, and more efficient designs across virtually all structural applications. It is available in plates, structural shapes (beams, channels, angles), and bars. **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 50**, the most widely used grade in the standard. * **Microalloying System:** Achieves its strength through controlled additions of **Columbium (Cb/Nb)**, **Vanadium (V)**, or a combination. These elements refine the grain structure and provide precipitation strengthening. * **Heat Treatment:** Typically supplied in the **as-rolled** condition for shapes and bars, and **as-rolled or normalized** for plates. Normalizing is often applied to thicker plates to ensure uniform through-thickness properties. * **Related & Interchangeable Standards:** * **A992 for Wide-Flange Shapes:** In the United States, **ASTM A992** (Fy = 50 ksi) is the preferred specification for rolled structural wide-flange shapes, superseding A572 Grade 50 for that product form due to stricter toughness and maximum yield-to-tensile ratio limits. * Internationally comparable to grades like **JIS G3106 SM490** and **EN 10025-2 S355JR** (though S355JR has a slightly lower nominal yield of 355 MPa). **Chemical Composition (Weight % - ASTM A572 Grade 50 Requirements)** Chemistry is balanced to achieve strength while maintaining excellent fabricability. | Element | Requirement (Max, unless noted) | Purpose & Note | | :--- | :--- | :--- | | **Carbon (C)** | 0.23% | Low for good 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 grain refiner. | | **Vanadium (V)** | 0.15% Max (if added) | Precipitation strengthener. | | **Copper (Cu)** | 0.20% min (when atmospheric corrosion resistance is specified) | Optional. | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.38 - 0.45, indicating **excellent weldability**. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A572 Grade 50) | Typical Performance & Significance | | :--- | :--- | :--- | | **Yield Strength (Min)** | 50 ksi (345 MPa) | Typically 55 - 65 ksi (380 - 450 MPa) | | **Tensile Strength** | 65 ksi (450 MPa) min | Typically 70 - 80 ksi (483 - 552 MPa) | | **Elongation in 2" (Min)** | 21% | Good ductility. | | **Yield-to-Tensile Ratio (Max for A992)** | 0.85 (per A992) | Controlled for seismic ductility in modern shapes. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | Standard for steel. | | **Atmospheric Corrosion Resistance** | ~2x carbon steel (if Cu ≥ 0.20% specified). | An optional but beneficial feature. | | **Key Feature** | **The Modern Structural Workhorse:** Represents the optimal balance of strength (50 ksi yield), fabricability (excellent weldability/formability), consistent quality, and cost-effectiveness for the vast majority of structural steel applications. | **Product Applications** ASTM A572 Grade 50 is the default material for primary structural framing in countless projects worldwide. * **Building Construction:** Columns, beams, girders, trusses, and base plates in commercial, industrial, and institutional buildings. * **Bridge Construction:** Primary girders, floor beams, truss members, and diaphragms. * **Heavy Equipment & Machinery:** Frames, booms, chassis, and structural supports for construction, mining, and agricultural equipment. * **Transmission & Communication Towers:** Primary structural members. * **Transportation:** Truck and trailer frames, railcar underframes, and shipping container corner posts. * **Industrial Structures:** Platforms, walkways, stair towers, and pipe supports. **Advantages & Fabrication Notes** * **Superior Weldability:** Its low carbon equivalent makes it one of the most weldable structural steels available. Standard procedures (SMAW, GMAW, FCAW, SAW) with low-hydrogen consumables are used. **Preheat is generally not required** for material less than 1 inch thick under normal conditions, per AWS D1.1. * **Excellent Formability & Toughness:** The fine-grained microstructure from microalloying provides good cold bending capability and improved notch toughness over older steels, making it suitable for a wide range of fabrication processes. * **Proven Reliability & Availability:** As the industry standard, it is produced by mills worldwide, ensuring consistent quality, comprehensive design data, and extensive fabrication experience. * **Cost Performance:** Offers the best value for achieving 50 ksi yield strength, with minimal premium over A36 but significant structural benefits. **Disclaimer:** This datasheet describes **ASTM A572 Grade 50**, the preeminent structural steel grade. For procurement: * For **plates and bars**, specify **ASTM A572 Grade 50**. * For **rolled wide-flange, channel, and angle shapes**, specify **ASTM A992** (which has tighter controls on chemistry and properties for seismic performance). * Always include any required supplementary requirements, such as **impact testing (ASTM A6 S1)** for low-temperature service or fracture-critical members, and **ultrasonic testing (ASTM A6 S4)** for thick plates. * Verify with the mill/supplier whether plates are supplied as-rolled or normalized, especially for thicknesses over 1.5 inches. This material has completely superseded obsolete grades like A440 and A441. Its properties and design values are comprehensively covered in all major design codes (AISC, AASHTO). -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 50 Specification Dimensions Size： Diameter 20-1000 mm Length <4717 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 50 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A572 Steel Seamless tube, grade 50 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A572 Steel Seamless tube, grade 50 -:- For detailed product information, please contact sales. -:

Packing of ASTM A572 Steel Seamless tube, grade 50 -:- 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 Seamless tube 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 1188 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