ASTM A131 Steel Seamless tube, grade DH36

ASTM A131 Steel Seamless tube, grade DH36 Product Information -:- For detailed product information, please contact sales. -: ASTM A131 Steel Seamless tube, grade DH36 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A131 Steel, grade DH36 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Data Sheet: ASTM A131/A131M Structural Steel for Ships, Grade DH36** --- #### **1. Product Overview** ASTM A131 Grade DH36 is a **high-strength structural steel** specifically designed for shipbuilding and offshore applications requiring enhanced mechanical properties combined with good toughness at moderate low temperatures. The "D" designates its impact testing temperature category (-20°C), "H" indicates high tensile strength, and "36" denotes the minimum yield strength of 355 MPa (36 kgf/mm²). This grade offers an optimal balance of strength, toughness, and weldability, making it suitable for critical structural components in large commercial vessels and marine structures. --- #### **2. International Standards & Equivalents** | Standard Organization | Designation | |-----------------------|-------------| | **ASTM International** | **A131/A131M Grade DH36** | | **ABS (American Bureau of Shipping)** | **Grade DH36** | | **Lloyd's Register** | **Grade DH36** | | **DNV** | **Grade DH36** | | **European Norm (EN)** | **DH36** (EN 10225) | | **Chinese GB** | **DH36** (GB 712) | | **Japanese (JIS)** | **KA36** | | **Korean (KS)** | **DH36** | --- #### **3. Chemical Composition (Weight %)** | Element | Composition (%) | |---------|-----------------| | **Carbon (C)** | 0.18 max | | **Manganese (Mn)** | 0.90-1.60 | | **Phosphorus (P)** | 0.025 max | | **Sulfur (S)** | 0.025 max | | **Silicon (Si)** | 0.10-0.50 | | **Aluminum (Al)** | 0.015 min | | **Niobium (Nb)** | 0.02-0.05 | | **Vanadium (V)** | 0.05-0.10 | | **Titanium (Ti)** | 0.02 max | | **Copper (Cu)** | 0.35 max | | **Nickel (Ni)** | 0.40 max | | **Chromium (Cr)** | 0.20 max | | **Molybdenum (Mo)** | 0.08 max | | **Iron (Fe)** | Balance | **Key Composition Features:** - **Controlled Carbon Content**: Maximum 0.18% for good weldability - **Microalloying Elements**: Nb, V, Ti for grain refinement and precipitation strengthening - **Fine Grain Practice**: Aluminum treatment required - **Carbon Equivalent (Ceq)**: ≤ 0.41% for good weldability - **PCM (Weld Crack Parameter)**: Typically ≤ 0.21% --- #### **4. Mechanical Properties** **Tensile Properties:** - **Tensile Strength**: 490-620 MPa (71-90 ksi) - **Yield Strength**: 355 MPa (51 ksi) min - **Elongation in 50 mm**: 21% min - **Yield to Tensile Ratio**: 0.70-0.85 typical **Impact Properties:** - **Charpy V-Notch Test Temperature**: **-20°C (-4°F)** - **Minimum Impact Energy**: **34 J (25 ft-lbf)** - **Test Direction**: Longitudinal and transverse as specified --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 7.85 g/cm³ | | **Modulus of Elasticity** | 205 GPa | | **Shear Modulus** | 80 GPa | | **Poisson's Ratio** | 0.29 | | **Thermal Conductivity** | 46.0 W/m·K | | **Coefficient of Thermal Expansion** | 12.0 × 10⁻⁶ /K | | **Specific Heat Capacity** | 450 J/kg·K | --- #### **6. Product Applications** **Primary Marine Applications:** - Large container ship hull structures - Bulk carrier side shells and decks - Oil tanker bottom plating - Offshore platform module support structures - Specialized vessel main deck plating **Specific Component Usage:** - Main deck plating in way of openings - Bottom plating in slamming areas - Longitudinal bulkheads in cargo holds - Transverse frames and web frames - Hatch coamings and strengthening members --- #### **7. Fabrication Characteristics** **Welding Performance:** - Good weldability with proper procedures - Recommended processes: FCAW, SAW, GMAW - **Pre-heat Requirements**: 50-125°C depending on thickness - **Carbon Equivalent (Ceq)**: 0.38-0.41% typical - **Filler Metal Selection**: Matching strength electrodes required **Forming Operations:** - Good cold forming characteristics - Suitable for bending and rolling operations - TMCP material offers better formability **Heat Treatment:** - Typically supplied in as-rolled or TMCP condition - Normalizing available when specified --- #### **8. Quality Assurance & Testing** **Mandatory Tests:** - Chemical analysis - Tension test - **Charpy V-notch impact test at -20°C** - Bend test when specified **Additional Tests:** - Ultrasonic examination - Through-thickness testing when specified --- #### **9. Corrosion Performance** - **Marine Atmosphere**: Good resistance with proper coating - **Requires**: Cathodic protection systems - **Recommended**: Epoxy coating systems --- #### **10. Available Product Forms** - Plates: 6 mm to 150 mm thickness - Standard widths: 1500-4500 mm - Standard lengths: 6000-18000 mm --- **Technical Notes:** - Grade DH36 provides 355 MPa yield strength with good toughness - Suitable for service temperatures down to -20°C - Requires certified welding procedures - Must comply with classification society rules *This information is for reference purposes. For complete requirements, consult the latest ASTM A131/A131M standard and applicable classification society rules.* -:- For detailed product information, please contact sales. -: ASTM A131 Steel, grade DH36 Specification Dimensions Size： Diameter 20-1000 mm Length <4226 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 DH36 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A131 Steel Seamless tube, grade DH36 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A131 Steel Seamless tube, grade DH36 -:- For detailed product information, please contact sales. -:

Packing of ASTM A131 Steel Seamless tube, grade DH36 -:- 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 697 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