ASTM A424 Steel, type II, composition A, commercial quality

ASTM A424 Steel, type II, composition A, commercial quality Product Information -:- For detailed product information, please contact sales. -: ASTM A424 Steel, type II, composition A, commercial quality Synonyms -:- For detailed product information, please contact sales. -:

ASTM A424 Steel, type II, composition A, commercial quality Product Information -:- For detailed product information, please contact sales. -: ### **Technical Data Sheet: ASTM A424 Steel, Type II, Composition A (Commercial Quality)** --- #### **1. Product Overview** ASTM A424 Type II, Composition A, Commercial Quality is a **terne-coated steel sheet** specifically formulated with a **copper-bearing steel base** to provide enhanced atmospheric corrosion resistance. This material combines the excellent solderability and formability of terne coating with the improved corrosion protection offered by copper-bearing steel, making it suitable for applications requiring better durability in corrosive environments while maintaining commercial quality formability. --- #### **2. International Standards & Equivalents** | Standard Organization | Designation | |-----------------------|-------------| | **ASTM International** | **A424 Type II, Comp A (CQ)** | | **UNS Number** | **K02603** | | **ISO International Standard** | **ISO 4999** | | **European Norm (EN)** | **EN 10205** | | **Japanese (JIS)** | **G3313** | | **Chinese GB** | **GB/T 11253** | --- #### **3. Chemical Composition (Weight %)** **Base Steel Composition (Copper-Bearing):** | Element | Composition (%) | |---------|-----------------| | **Carbon (C)** | 0.15 max | | **Manganese (Mn)** | 0.60 max | | **Phosphorus (P)** | 0.035 max | | **Sulfur (S)** | 0.035 max | | **Silicon (Si)** | 0.10 max | | **Copper (Cu)** | 0.20 min | | **Iron (Fe)** | Balance | **Terne Coating Composition:** | Element | Composition (%) | |---------|-----------------| | **Lead (Pb)** | 75-90% | | **Tin (Sn)** | 10-25% | | **Other Elements** | 0.50 max | **Key Composition Features:** - **Copper-Bearing Steel**: Minimum 0.20% Cu for enhanced atmospheric corrosion resistance - **Commercial Quality Base**: Balanced chemistry for good formability - **Standard Terne Coating**: Lead-tin alloy for solderability and additional protection - **Coating Weight**: 30-110 g/m² total both sides --- #### **4. Mechanical Properties** **Base Metal Properties (Commercial Quality):** - **Tensile Strength**: 290-450 MPa (42,000-65,000 psi) - **Yield Strength**: 170 MPa (25,000 psi) min - **Elongation in 50 mm (2 in)**: 20% min - **Hardness**: 50-75 HRB **Enhanced Properties:** - **Corrosion Resistance**: Superior to non-copper-bearing grades - **Coating Adhesion**: Good for commercial forming operations - **Solderability**: Excellent with standard solder alloys --- #### **5. Physical Properties** | Property | Value | |----------|-------| | **Density (Base Steel)** | 7.85 g/cm³ | | **Density (Terne Coating)** | 9.50-10.50 g/cm³ | | **Melting Point (Coating)** | 183-327°C (361-621°F) | | **Thermal Conductivity** | 48.0 W/m·K | | **Coefficient of Thermal Expansion** | 12.0 × 10⁻⁶ /K | | **Electrical Conductivity** | 12-15% IACS | | **Magnetic Properties** | Ferromagnetic | --- #### **6. Product Applications** **Enhanced Corrosion Resistance Applications:** - **Outdoor Electrical Enclosures**: Meter boxes, junction boxes - **HVAC Components**: External ductwork, ventilation caps - **Architectural Applications**: Roof flashing, gutter components - **Agricultural Equipment**: Non-structural components exposed to weather **General Industrial Applications:** - **Containers**: Outdoor storage cans, industrial containers - **Hardware**: Commercial-grade brackets, mounting hardware - **Automotive**: Non-critical components requiring better corrosion resistance --- #### **7. Manufacturing & Fabrication** **Forming Characteristics:** - **Good Formability**: Suitable for bending and moderate forming - **Coating Adhesion**: Maintains integrity in commercial forming operations - **Minimum Bend Radius**: 1.5 × thickness - **Tooling**: Standard commercial tooling suitable **Joining Methods:** - **Excellent Solderability**: With common solder alloys - **Soldering Temperature**: 200-300°C (392-572°F) - **Resistance Welding**: Good performance with proper parameters - **Mechanical Fastening**: Suitable for commercial applications **Surface Treatment:** - **Painting**: Good adhesion with proper surface preparation - **Additional Protection**: Can be painted for enhanced durability - **Storage**: Dry conditions recommended --- #### **8. Quality Assurance & Testing** **Commercial Quality Tests:** - Chemical analysis (including copper verification) - Coating weight measurement - Coating adhesion testing (bend test) - Solderability testing - Visual surface inspection **Corrosion Performance:** - Atmospheric exposure testing - Salt spray testing (when specified) - Adhesion after forming --- #### **9. Corrosion Performance** - **Atmospheric Corrosion**: Enhanced resistance due to copper content - **Rust Progression**: Slower than non-copper-bearing grades - **Weathering**: Develops protective patina over time - **Fuel Resistance**: Good resistance to petroleum products - **Economic Protection**: Cost-effective enhanced corrosion resistance --- #### **10. Available Product Forms** **Commercial Dimensions:** - **Thickness Range**: 0.45 mm to 2.00 mm (0.018" to 0.079") - **Width Range**: 600 mm to 1500 mm (24" to 60") - **Length Range**: Coils or cut lengths as required **Surface Conditions:** - Standard terne coating finish - Oiled for storage and handling - Commercial surface quality --- #### **11. Technical Specifications** **Coating Requirements:** - **Coating Weight**: 30-110 g/m² total both sides - **Coating Uniformity**: Commercially acceptable coverage - **Copper Content**: Minimum 0.20% in base metal **Dimensional Tolerances (Commercial):** - **Thickness Tolerance**: ±0.08 mm - **Width Tolerance**: +5 mm, -0 mm - **Length Tolerance**: +10 mm, -0 mm - **Flatness**: Commercially straight --- **Technical Notes:** - Copper-bearing base steel provides approximately 1.5-2× better atmospheric corrosion resistance compared to non-copper grades - Suitable for applications where enhanced durability is required but premium grades are not justified - Maintains excellent solderability while offering improved corrosion protection - Proper handling and storage recommended to maintain coating integrity - Compliance with local regulations regarding lead content may be required *This information is for reference purposes. For complete commercial quality requirements and corrosion performance specifications, consult the latest ASTM A424 standard and applicable industry specifications. Material testing recommended for applications in highly corrosive environments.* -:- For detailed product information, please contact sales. -: ASTM A424 Steel, type II, composition A, commercial quality Specification Dimensions Size： Diameter 20-1000 mm Length <4247 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 A424 Steel, type II, composition A, commercial quality Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A424 Steel, type II, composition A, commercial quality -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A424 Steel, type II, composition A, commercial quality -:- For detailed product information, please contact sales. -:

Packing of ASTM A424 Steel, type II, composition A, commercial quality -:- 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 718 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