Spherical ASTM A131 Steel Powder, Grade DS

ASTM A131 Steel Spherical Powder, Grade DS Product Information -:- For detailed product information, please contact sales. -: ASTM A131 Steel Spherical Powder, Grade DS Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A131 Steel Powder, Grade DS characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A131 Steel Powder, Grade DS Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical ASTM A131 Steel Powder, Grade DS Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical ASTM A131 Steel Powder, Grade DS Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A131 Steel, Grade DS Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A131 Grade DS Higher-Strength Carbon-Manganese Steel for Marine Service** **Product Overview** ASTM A131 Grade DS is a **higher-strength carbon-manganese structural steel** specified within the ASTM A131 standard (*Standard Specification for Structural Steel for Ships*). It represents an intermediate grade between the general-purpose carbon steel Grade CS and the high-strength, low-alloy (HSLA) “AH” series (e.g., AH36). Grade DS achieves its enhanced strength primarily through a higher carbon and manganese content, along with optional micro-alloying. It is designed for applications requiring **greater strength than Grade CS** but where the specific chemistry, processing, or cost of AH36-grade steel may not be necessary. It offers a good balance of strength, weldability, and cost-effectiveness for moderately demanding marine structures. **Key International Standards** * **Primary Standard:** **ASTM A131/A131M** - Standard Specification for Structural Steel for Ships. * **Common Equivalents & Context:** * **ASTM A572 Grade 50:** A closely comparable land-based structural grade with similar minimum yield strength (50 ksi / 345 MPa). However, **A131 Grade DS includes mandatory marine toughness certification.** * **ABS (American Bureau of Shipping):** ABS Grade DS. * **DNV (Det Norske Veritas):** NV NS. * **LR (Lloyd’s Register):** Grade DS. * **Note:** While not a perfect one-to-one match, it often corresponds to the **S355** grade family in EN 10025 standards, but with specific marine approval requirements. **Chemical Composition (Typical % by Weight, per ASTM A131)** The composition is tailored for higher strength while maintaining acceptable weldability and toughness. | Element | Content (Typical Range / Maximum, %) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.18 - 0.22 | The primary strengthening element. Higher than AH36, but controlled to maintain weldability. | | **Manganese (Mn)** | 1.00 - 1.60 | Significantly contributes to strength and hardenability through solid solution strengthening. The key differentiator from Grade CS. | | **Phosphorus (P)** | 0.035 max | Harmful impurity; kept low to prevent cold brittleness. | | **Sulfur (S)** | 0.035 max | Harmful impurity; kept low to improve hot workability and toughness. | | **Silicon (Si)** | 0.10 - 0.50 | Deoxidizer, contributes to strength. | | **Aluminum (Al)** | (May be specified) | Grain refiner for improved toughness. | | **Niobium (Nb) / Vanadium (V)** | (Optional, if specified) | Micro-alloying elements may be added in small amounts (e.g., ≤0.05%) for grain refinement and precipitation strengthening, especially in thicker sections or for thermomechanical rolling. | **Physical & Mechanical Properties** | Property | Requirement / Typical Value | Test Standard / Condition | | :--- | :--- | :--- | | **Yield Strength (Min)** | **50 ksi (345 MPa)** for plates up to approximately 0.75 inches (19 mm) thick. Strength decreases with increasing thickness per the standard’s tables. | ASTM A370 | | **Tensile Strength** | **65 - 85 ksi (450 - 585 MPa)** | ASTM A370 | | **Elongation (Min)** | **18%** (in 8 in.) / **20%** (in 50 mm) for plates. | ASTM A370 | | **Charpy V-Notch Impact Toughness** | A **mandatory requirement**.
Test temperature is typically **0°C (32°F)**.
Minimum average energy: **20 J (15 ft-lbf)** for longitudinal specimens (common requirement). May be higher per specific purchase order or class rules. | ASTM A370 / ASTM A673 | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | - | | **Modulus of Elasticity** | 29,000 ksi (200 GPa) | - | | **Poisson’s Ratio** | 0.29 | - | **Key Distinguishing Features** * **vs. Grade CS:** Higher minimum yield strength (50 ksi vs. 32 ksi) due to increased C and Mn. * **vs. Grade AH36:** Similar yield strength level, but AH36 achieves it with lower carbon and stricter micro-alloying (Nb, V, Al), generally resulting in **superior toughness at lower temperatures** and better weldability. Grade DS is often a more cost-effective option for applications where the -20°C/-40°C toughness of AH grades is not mandated. **Product Forms & Applications** * **Forms:** * Plates * Structural Shapes (beams, channels) * Bars * **Typical Marine Applications:** * **Primary Hull Members:** In midsize vessels or specific regions of larger ships where higher strength than CS is needed (e.g., side shells, deck plating in non-ice-going vessels). * **Offshore Module Construction:** For walkways, secondary support structures, and non-primary load-bearing components. * **Barge Construction:** Particularly for ocean-going barges requiring stronger materials than CS. * **Shipyard Foundations & Heavy Lift:** For construction jigs, strong-backs, and other yard equipment that benefits from higher-strength classified steel. * **Applications with moderate static loads** where weight savings over CS are beneficial, but extreme low-temperature service is not a concern. **Advantages of ASTM A131 Grade DS** * **Enhanced Strength-to-Weight Ratio:** Provides a significant strength increase over Grade CS, allowing for lighter or stronger structures. * **Cost-Effective Strength:** Often more economical than AH36 grades, offering a good performance-to-cost balance for many applications. * **Good Fabricability:** Remains readily weldable and formable with standard procedures, though preheat may be required more often than for CS due to higher carbon equivalent. * **Marine Certification:** Supplied with full traceability and mandatory impact testing, ensuring quality for regulated marine use. **Conclusion** **ASTM A131 Grade DS** is a versatile, **higher-strength carbon-manganese steel** that fills an important niche in marine construction. It is the preferred choice when the demands exceed the capability of Grade CS, but the full performance (and associated cost) of AH36-grade HSLA steel is not required. Its guaranteed mechanical properties and marine-grade certification make it a reliable and efficient material for a wide range of ship and offshore structures operating in non-Arctic environments. -:- For detailed product information, please contact sales. -: ASTM A131 Steel, Grade DS Specification Dimensions Size： Diameter 20-1000 mm Length <5968 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. -:

Spherical ASTM A131 Steel Powder, Grade DS Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A131 Steel Powder, Grade DS -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A131 Steel Spherical Powder, Grade DS -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A131 Steel Spherical Powder, Grade DS -:- For detailed product information, please contact sales. -:

Packing of ASTM A131 Steel Spherical Powder, 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 Spherical Powder 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 2439 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