Bethlehem Steel ASTM A573 Grade 70, steel

Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate Product Information -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate Synonyms -:- For detailed product information, please contact sales. -:

Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate Product Information -:- For detailed product information, please contact sales. -: ## **Product Specification: Bethlehem Steel ASTM A573 Grade 70 Steel Plate (3/16" to 1/2" Thick)** **Product Overview** Bethlehem Steel ASTM A573 Grade 70 represents the highest strength grade within the ASTM A573 "Improved Toughness" series of structural carbon steel plates. Designed for critical applications where exceptional strength must be combined with verified impact resistance, this grade offers a minimum yield strength of 70 ksi (485 MPa). Available in thicknesses from 3/16" (4.8 mm) to 1/2" (12.7 mm), it provides engineers with a premium material solution for high-stress components subjected to dynamic or shock loading conditions. The product is distinguished by its mandatory Charpy V-Notch impact testing, ensuring reliable performance in demanding environments where brittle fracture resistance is paramount. **International Standard Compliance** * **Primary Standard:** **ASTM A573/A573M** - Standard Specification for High-Strength Structural Carbon Steel Plates of Improved Toughness * **Alternative Designations:** SAE J1392, UNS K11502 * **International Equivalents:** - **EN Standard:** EN 10025-2 S460NL (with normalized delivery) - **JIS Standard:** G3114 SM570 (similar application scope) * **Certifications:** Typically available with CE marking for European markets and compliant with major international pressure vessel and structural codes when specified **Chemical Composition (Heat Analysis, Weight %)** The chemistry is carefully balanced to achieve high strength through alloying while maintaining excellent toughness characteristics through grain refinement and purity control. | Element | Composition Range | Typical Value | Function | |---------|-------------------|---------------|----------| | Carbon (C) | 0.20 - 0.25% max | 0.22% | Primary strengthening element | | Manganese (Mn) | 1.00 - 1.60% | 1.35% | Enhances strength and hardenability | | Phosphorus (P) | 0.035% max | 0.015% | Controlled for weldability | | Sulfur (S) | 0.040% max | 0.005% | Minimized for improved toughness | | Silicon (Si) | 0.15 - 0.40% | 0.25% | Deoxidizer and solid solution strengthener | | Copper (Cu) | 0.20% min (when specified) | 0.25% | Optional for atmospheric corrosion resistance | | Aluminum (Al) | 0.015 - 0.050% | 0.035% | Grain refiner (killed steel practice) | | Nitrogen (N) | 0.012% max | 0.008% | Controlled to prevent aging effects | | **Carbon Equivalent (CE)** | **0.42 max** | **0.40** | Calculated per CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 | *Note: Lower carbon content versions (A573 Grade 70 Type 2) with CE ≤ 0.38 are available for enhanced weldability requirements.* **Physical & Mechanical Properties** **1. Standard Mechanical Properties (Room Temperature):** - **Yield Strength (min):** 70 ksi (485 MPa) - **Tensile Strength:** 85 - 105 ksi (585 - 725 MPa) - **Yield-to-Tensile Ratio:** 0.78 - 0.85 - **Elongation in 2" (min):** 17% - **Elongation in 8" (min):** 19% - **Reduction of Area (typical):** 45 - 55% **2. Impact Properties (Charpy V-Notch):** *Mandatory testing for plates ≥ 0.375" (9.5mm) thickness* - **Minimum Energy Absorption:** 20 ft-lb (27 J) at specified temperature - **Standard Test Temperatures:** Available for +70°F (+21°C), +40°F (+4°C), 0°F (-18°C), -20°F (-29°C) - **Typical Performance:** 40-60 ft-lb (54-81 J) at 0°F (-18°C) for normalized material **3. Physical Constants:** - **Density:** 0.283 lb/in³ (7.85 g/cm³) - **Modulus of Elasticity:** 29,000 ksi (200 GPa) - **Shear Modulus:** 11,500 ksi (79 GPa) - **Poisson's Ratio:** 0.29 - **Coefficient of Thermal Expansion:** 6.5 × 10⁻⁶/°F (11.7 × 10⁻⁶/°C) from 68-212°F - **Thermal Conductivity:** 28.5 BTU·in/(hr·ft²·°F) at 212°F - **Specific Heat:** 0.10 BTU/(lb·°F) at 68-212°F **4. Technological Properties:** - **Weldability:** Good with proper procedures (AWS D1.1 Group III) - **Carbon Equivalent (IIW):** 0.38 - 0.45 - **Preheat Requirements:** Typically 200-300°F for thicknesses > 0.75" - **Machinability:** 55% of B1112 (moderate; requires adequate power and rigid tooling) - **Formability:** Moderate; minimum bend radius of 2.5t for 90° bending **Product Applications** **Primary Market Sectors:** **1. Heavy Construction & Infrastructure:** - Critical bridge components (gusset plates, connection elements) - High-rise building moment frames and diagonal bracing - Transmission tower structural members in high-wind zones - Seismic-resistant structural systems **2. Mining & Material Handling Equipment:** - Excavator boom and arm components - Dragline structural members - High-capacity crane boom sections - Mining shovel dipper handles and frames **3. Energy & Power Generation:** - Wind turbine tower flanges and structural components - Power plant structural supports and platforms - Hydroelectric turbine components - Nuclear plant non-pressure structural elements **4. Transportation & Heavy Equipment:** - Military vehicle structural frames - Heavy haul trailer main beams - Railroad car bolster plates and center sills - Offshore access platform structural members **5. Special Applications:** - Shipbuilding (deck plates, bulkheads for specialized vessels) - Defense applications (armored vehicle structural elements) - Heavy industrial machinery bases and frames - Specialized lifting and rigging equipment **Manufacturing & Processing Characteristics** **1. Heat Treatment Options:** - **As-Rolled:** Standard delivery condition - **Normalized:** Enhanced toughness (A573 Grade 70N) - **Stress Relieved:** Available for critical applications **2. Available Forms & Tolerances:** - **Thickness Tolerance:** Per ASTM A6/A6M - **Width Range:** Up to 150 inches - **Length Range:** Up to 600 inches - **Flatness:** Commercial, structural, or mill edge as specified - **Surface Finish:** Mill scale (standard) or blasted/primed (optional) **3. Quality Assurance:** - Ultrasonic Testing per ASTM A578/A578M (available) - Magnetic Particle Inspection (when specified) - Dye Penetrant Inspection (when specified) - Full traceability with heat number identification **4. Processing Recommendations:** - **Cutting:** Oxy-fuel, plasma, laser, or waterjet recommended - **Forming:** Cold forming possible with proper tooling and radii - **Welding:** Use low-hydrogen processes with matching strength filler metals - **Heat Treatment:** Post-weld heat treatment may be required for thick sections **Technical Advantages** 1. **Superior Strength-Toughness Combination:** Highest yield strength in the A573 series with guaranteed impact properties 2. **Enhanced Safety Margin:** Verified fracture resistance through mandatory Charpy testing 3. **Weldability:** Despite high strength, maintains reasonable weldability with proper procedures 4. **Design Efficiency:** Enables weight reduction in critical structural applications 5. **Proven Performance:** Decades of successful application in demanding environments 6. **Code Acceptance:** Widely recognized in ASME, AWS, AISC, and international standards **Procurement Specifications** When ordering, specify: - ASTM A573 Grade 70 (or 70N for normalized) - Thickness, width, and length requirements - Charpy test temperature and energy requirements - Additional testing requirements (UT, MT, PT) - Edge condition and flatness requirements - Surface preparation if required - Certification requirements (EN 10204 3.1 or 3.2) **Disclaimer** This product information is based on typical industry standards and historical Bethlehem Steel specifications. Actual properties may vary by manufacturer and heat lot. For critical applications, consult the certified mill test reports and conduct appropriate engineering evaluations. Always adhere to applicable codes and standards for design, fabrication, and installation. Bethlehem Steel Corporation historical data is referenced for informational purposes; current producers may have slightly different manufacturing practices while meeting ASTM A573 Grade 70 requirements. -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate Specification Dimensions Size： Diameter 20-1000 mm Length <4635 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. -: Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate Properties -:- For detailed product information, please contact sales. -:

Applications of Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate -:- For detailed product information, please contact sales. -:

Packing of Bethlehem Steel ASTM A573 Grade 70 3/16 to 1/2 in. thick, steel plate -:- 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 1106 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