ASTM A131 Steel Rod/Bar, Grade DS

ASTM A131 Steel Rod, Grade DS Product Information -:- For detailed product information, please contact sales. -: ASTM A131 Steel Rod, Grade DS Synonyms -:- For detailed product information, please contact sales. -:

ASTM A131 Steel, Grade DS Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A131 Grade DS Steel** **ASTM A131 Grade DS** is a high-quality carbon-manganese steel specifically designed for shipbuilding applications requiring improved toughness properties. As part of the ASTM A131 specification for "Structural Steel for Ships," this grade offers enhanced impact toughness compared to standard carbon steels, making it suitable for structural components where moderate low-temperature performance is required. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A131/A131M** - "Standard Specification for Structural Steel for Ships" **Grade Classification:** - **Grade DS** - Carbon-manganese steel with improved toughness - Other grades in A131 series: A, B, CS, E, AH32, AH36, DH32, DH36, EH32, EH36 **International Equivalents:** - **EN 10025-2**: S275J2 - **JIS G3106**: SM490B - **ABS Rules**: DS (American Bureau of Shipping) - **LR Standards**: Grade D (Lloyd's Register) --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A131 Grade DS: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.21 | | Manganese (Mn) | 0.80-1.20 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.35 | | Aluminum (Al) | 0.015 (min. for fine grain practice) | **Key Composition Features:** - **Enhanced Manganese**: Higher manganese content for improved toughness - **Fine Grain Practice**: Aluminum treatment for grain refinement - **Controlled Carbon**: Optimized for weldability and strength balance - **Standard Deoxidation**: Typically silicon-killed steel --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 410-490 MPa (59-71 ksi) | | **Yield Strength (min.)** | 235 MPa (34 ksi) | | **Elongation in 2" (min.)** | 22% | | **Elongation in 8" (min.)** | 24% | **Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: 0°C (32°F) - **Minimum Impact Energy**: 27 J (20 ft-lbf) - **Improved Toughness**: Better impact properties than Grade CS **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**: 51.5 W/m·K - **Coefficient of Thermal Expansion**: 11.7 × 10⁻⁶/°C --- #### **4. Product Applications** **Shipbuilding Applications:** - Hull plating for moderate service conditions - Deck structures in non-extreme environments - Bulkhead components - Superstructure members **Marine Structures:** - Coastal vessel components - Fishing vessel structures - Workboat construction - Ferry boat components **Moderate Service Applications:** - Ship interior primary structures - Machinery foundations - Moderate stress deck areas - Coastal infrastructure **Ancillary Marine Components:** - Marine staircase structures - Platform components - Access way supports - Service vessel structures --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Excellent Weldability**: All common processes applicable - **Preheat Guidelines**: Recommended for thicknesses > 25 mm - **Recommended Processes**: SMAW, GMAW, FCAW - **Filler Metals**: E7018, ER70S-6 or equivalent **Forming & Cutting:** - **Good Formability**: Suitable for standard shipyard operations - **Cold Bending**: Good performance with proper radii - **Cutting Methods**: Plasma, oxy-fuel, and mechanical cutting - **Edge Quality**: Good for welding preparation **Quality Assurance:** - **Mandatory Impact Testing**: Charpy V-Notch at specified temperature - **Chemical Analysis**: Heat certification required - **Mechanical Testing**: Tensile tests from each heat - **Classification Society Approval**: Required for marine applications **Corrosion Performance:** - **Standard Marine Protection**: Requires proper coating systems - **Maintenance**: Regular inspection and coating maintenance - **Service Life**: Good with proper corrosion management --- ### **Technical Summary** ASTM A131 Grade DS represents an intermediate-grade shipbuilding steel that offers improved toughness characteristics over basic carbon steels while maintaining excellent fabrication properties. The enhanced manganese content and fine grain practice provide reliable impact performance at moderate service temperatures, making it suitable for a wide range of marine applications. This grade fills an important position in shipbuilding material selection, offering better toughness than Grade CS while being more economical than the high-strength grades like AH32 and AH36. The balanced mechanical properties and good weldability make Grade DS particularly valuable for vessels operating in temperate climates and moderate service conditions. The material's compliance with major classification society requirements ensures it meets the rigorous standards necessary for marine applications. Grade DS has established itself as a reliable choice for coastal vessels, workboats, and other marine structures where enhanced toughness is required but the extreme low-temperature performance of higher grades is not necessary. The proven performance history of ASTM A131 Grade DS in marine service, combined with its cost-effectiveness and excellent fabrication characteristics, makes it a preferred option for shipbuilders seeking a balanced solution for moderate service applications in the marine industry. -:- For detailed product information, please contact sales. -: ASTM A131 Steel, Grade DS Specification Dimensions Size： Diameter 20-1000 mm Length <4328 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 A131 Steel, Grade DS Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A131 Steel Rod, Grade DS -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A131 Steel Rod, Grade DS -:- For detailed product information, please contact sales. -:

Packing of ASTM A131 Steel Rod, Grade DS -:- 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 Rod 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 799 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