ASTM A570 Steel, grade 50

ASTM A570 Steel, grade 50 Product Information -:- For detailed product information, please contact sales. -: ASTM A570 Steel, grade 50 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A570 Steel, grade 50 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A570 Grade 50 Steel** **ASTM A570 Grade 50** is a high-strength hot-rolled carbon steel sheet and strip designed for structural applications requiring a minimum yield strength of **50 ksi (345 MPa)**. As the highest commonly used grade in the A570 series, it provides superior load-bearing capacity while maintaining reasonable formability and weldability. This grade serves as an economical high-strength solution for structural components where weight reduction and enhanced performance are critical requirements. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A570/A570M** - "Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality" **Grade Classification:** - **Grade 50** [345 MPa] - Minimum yield strength 50 ksi - Other grades in A570 series: 30, 33, 36, 40, 45, 55 **International Equivalents:** - **EN 10025-2**: S355JR/S355J0 - **JIS G3101**: SM490 - **GB/T 700**: Q345 - **ISO 630-2**: E355C --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A570 Grade 50: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.25 | | Manganese (Mn) | 0.90 | | Phosphorus (P) | 0.04 | | Sulfur (S) | 0.05 | | Silicon (Si) | 0.40 (optional) | **Key Composition Features:** - **High-Strength Carbon Steel**: Maximum strength in the A570 series - **Optimized Chemistry**: Balanced for strength and manufacturability - **Manganese Utilization**: Primary strengthening mechanism - **Controlled Impurities**: Limited phosphorus and sulfur for ductility --- #### **3. Physical & Mechanical Properties** **Mechanical Properties:** | Property | Value | |---|---| | **Tensile Strength** | 520-620 MPa (75-90 ksi) | | **Yield Strength (min.)** | 345 MPa (50 ksi) | | **Elongation in 2" (min.)** | 16% | | **Elongation in 8" (min.)** | 19% | **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 51.9 W/m·K - **Coefficient of Thermal Expansion**: 11.7 × 10⁻⁶/°C - **Specific Heat Capacity**: 486 J/kg·K --- #### **4. Product Applications** **Heavy Structural Framing:** - Building primary support columns - Heavy industrial roof structures - Crane support beams and girders - Mezzanine primary framing **Transportation Industry:** - Heavy truck main frames - Trailer chassis components - Bus structural reinforcements - Special vehicle chassis elements **Industrial Equipment:** - Heavy machinery base frames - Press equipment supports - Crane and hoist structural members - Heavy conveyor support structures **Construction & Infrastructure:** - Bridge floor beams - Construction shoring systems - Temporary bridge components - Heavy-duty scaffolding **Agricultural & Mining:** - Mining equipment frames - Tractor main frames - Excavator structural components - Heavy implement supports --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability with Precautions**: Requires controlled procedures - **Preheat Requirement**: 100-150°C for thicknesses over 3/8 inch - **Recommended Processes**: GMAW, FCAW, SMAW (low-hydrogen) - **Filler Metals**: E70XX or E80XX series electrodes **Forming & Machining:** - **Moderate Formability**: Requires significant forming power - **Bend Radius**: Typically 2.5t to 3t for 90° bends - **Machinability**: Fair to poor (approximately 45% of B1112 steel) - **Shearing & Punching**: Requires heavy-duty equipment **Surface Characteristics:** - Standard hot-rolled surface with mill scale - Thorough surface preparation essential for coating adhesion - Suitable for all industrial coating systems - Abrasive blasting recommended for critical applications **Heat Treatment:** - Supplied in as-rolled condition - Stress relieving recommended for complex welded structures - Normalizing available for enhanced properties --- ### **Technical Summary** ASTM A570 Grade 50 represents the pinnacle of strength in the economical hot-rolled carbon steel category, delivering 50 ksi yield strength for demanding structural applications. This grade provides designers with a cost-effective high-strength option that bridges the gap between conventional carbon steels and premium high-strength low-alloy grades. While fabrication requires more careful procedure control compared to lower grades, the significant strength advantage makes it ideal for applications where weight reduction and structural efficiency are paramount. The grade's excellent strength-to-cost ratio has made it a preferred choice for heavy structural applications across multiple industries. Proper attention to welding parameters, forming limitations, and surface preparation ensures optimal performance in finished components, making ASTM A570 Grade 50 a reliable and economical choice for high-strength structural requirements. -:- For detailed product information, please contact sales. -: ASTM A570 Steel, grade 50 Specification Dimensions Size： Diameter 20-1000 mm Length <4297 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 A570 Steel, grade 50 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A570 Steel, grade 50 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A570 Steel, grade 50 -:- For detailed product information, please contact sales. -:

Packing of ASTM A570 Steel, 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 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 768 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