ASTM A611 Steel Rod/Bar, grade D

ASTM A611 Steel Rod, grade D Product Information -:- For detailed product information, please contact sales. -: ASTM A611 Steel Rod, grade D Synonyms -:- For detailed product information, please contact sales. -:

ASTM A611 Steel, grade D Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A611 Grade D Steel** **ASTM A611 Grade D** is a high-strength cold-rolled carbon steel sheet representing the highest strength grade in the A611 specification series. This grade is specifically engineered for structural applications requiring superior mechanical properties while maintaining adequate formability for manufacturing operations. With a minimum yield strength of **40 ksi (275 MPa)**, Grade D provides an optimal balance between high strength and practical manufacturability, serving as a cost-effective alternative to more expensive high-strength low-alloy steels. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A611/A611M** - "Standard Specification for Structural Quality Cold-Rolled Carbon Steel Sheet" **Grade Classification:** - **Grade D** - Minimum yield strength 40 ksi (275 MPa) - Other grades in A611 series: A, B, C **International Equivalents:** - **EN 10130**: DC06 - **JIS G3141**: SPCEN - **GB/T 5213**: DC07 - **ISO 3574**: CR5 --- #### **2. Chemical Composition** The typical chemical composition requirements for ASTM A611 Grade D: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.18-0.25 | | Manganese (Mn) | 0.90-1.30 | | Phosphorus (P) | 0.03 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.20 | **Key Composition Features:** - **High Carbon Content**: Primary contributor to enhanced strength properties - **Elevated Manganese**: Significantly improves hardenability and tensile strength - **Precise Phosphorus Control**: Maintains balance between strength and ductility - **Optimized Alloy Balance**: Maximizes strength while preserving formability --- #### **3. Physical & Mechanical Properties** **Mechanical Properties:** | Property | Value | |---|---| | **Tensile Strength** | 450-550 MPa (65-80 ksi) | | **Yield Strength (min.)** | 275 MPa (40 ksi) | | **Elongation in 2" (min.)** | 18% | | **Hardness (HRB)** | 70-85 | **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**: 49.8 W/m·K - **Coefficient of Thermal Expansion**: 11.9 × 10⁻⁶/°C - **Electrical Resistivity**: 0.21 μΩ·m --- #### **4. Product Applications** **Automotive Structural Applications:** - Safety cage reinforcements - Door impact beams - B-pillar reinforcements - Chassis cross members **Heavy-Duty Construction:** - Structural support members - Load-bearing framing components - Roof truss systems - Building reinforcement elements **Industrial Equipment:** - Heavy machinery frames - Equipment support structures - Industrial conveyor components - Machine safety guards **Transportation and Logistics:** - Truck body reinforcements - Trailer structural components - Heavy-duty storage systems - Material handling equipment **Special Applications:** - Security door components - Heavy-duty shelving systems - Industrial platform structures - Safety equipment frames --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Fair Weldability**: Requires careful parameter control - **Preheat Requirement**: Recommended for all thicknesses - **Recommended Processes**: GMAW, Resistance welding - **Filler Metals**: ER70S-6 or higher strength equivalents **Forming Characteristics:** - **Limited Formability**: Suitable for simple bending operations - **Minimum Bend Radius**: 1.5t for 90° bends - **Springback Compensation**: Essential in tooling design - **Surface Considerations**: May show minor strain lines in severe forming **Machining & Cutting:** - **Moderate Machinability**: Requires carbide tooling for optimal results - **Shearing Performance**: Good with heavy-duty equipment - **Punching Characteristics**: Requires increased tonnage capacity - **Laser Cutting**: Excellent results with proper parameter optimization **Surface Treatment:** - **Good Paint Adhesion**: With proper surface preparation - **Plating Suitability**: Requires process modifications - **Pretreatment Response**: Excellent with phosphate coatings - **Finished Appearance**: High-quality surface for critical applications --- ### **Technical Summary** ASTM A611 Grade D represents the premium strength grade in the cold-rolled structural steel category, offering manufacturers the highest mechanical properties within the A611 specification. The significantly enhanced carbon and manganese content provide superior strength characteristics while maintaining sufficient formability for practical manufacturing applications. This grade is particularly valuable in weight-sensitive designs where structural performance and material efficiency are critical considerations. While requiring more sophisticated fabrication techniques and careful process control compared to lower grades, Grade D delivers exceptional performance in demanding applications. Its optimal strength-to-cost ratio makes it an ideal choice for automotive safety components, structural reinforcements, and industrial equipment where maximum mechanical performance from cold-rolled steel is required. The material's consistent properties and reliable behavior under stress ensure dependable performance in critical applications across multiple industries, providing engineers with a versatile high-strength solution for challenging design requirements. -:- For detailed product information, please contact sales. -: ASTM A611 Steel, grade D Specification Dimensions Size： Diameter 20-1000 mm Length <4304 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 A611 Steel, grade D Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A611 Steel Rod, grade D -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A611 Steel Rod, grade D -:- For detailed product information, please contact sales. -:

Packing of ASTM A611 Steel Rod, grade D -:- 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 775 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