ASTM A573 Steel Seamless tube, grade 70

ASTM A573 Steel Seamless tube, grade 70 Product Information -:- For detailed product information, please contact sales. -: ASTM A573 Steel Seamless tube, grade 70 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A573 Steel, grade 70 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A573 Grade 70 Steel** **ASTM A573 Grade 70** is a high-strength carbon steel plate classified under the specification for structural carbon steel plates of improved toughness. This grade provides a minimum yield strength of **40 ksi (280 MPa)** and represents the highest strength level in the A573 series. The "70" designation refers to the minimum tensile strength in ksi units, making it suitable for structural applications requiring enhanced strength combined with superior toughness properties in moderately thick sections. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A573/A573M** - "Standard Specification for Structural Carbon Steel Plates of Improved Toughness" **Grade Classification:** - **Grade 70** [480 MPa tensile strength] - Minimum tensile strength 70 ksi - Other grades in A573 series: 58 and 65 **International Equivalents:** - **EN 10025-2**: S355JR/S355J0 - **JIS G3101**: SM520 - **GB/T 1591**: Q355 - **ISO 630-2**: E355C --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A573 Grade 70: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.23 | | Manganese (Mn) | 1.20-1.50 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.15-0.40 | **Key Composition Features:** - **Controlled Carbon Content**: Maximizes strength while maintaining weldability - **Elevated Manganese**: Enhanced range for increased strength and hardenability - **Silicon Content**: Provides deoxidation and solid solution strengthening - **Restricted Impurities**: Limited sulfur and phosphorus for improved toughness --- #### **3. Physical & Mechanical Properties** **Mechanical Properties:** | Property | Value | |---|---| | **Tensile Strength** | 480-620 MPa (70-90 ksi) | | **Yield Strength (min.)** | 280 MPa (40 ksi) | | **Elongation in 2" (min.)** | 17% | | **Elongation in 8" (min.)** | 19% | **Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: 70°F (21°C) - **Minimum Impact Energy**: 20 ft-lbf (27 J) **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**: 51.9 W/m·K - **Coefficient of Thermal Expansion**: 11.7 × 10⁻⁶/°C - **Specific Heat Capacity**: 486 J/kg·K --- #### **4. Product Applications** **Heavy Structural Construction:** - Bridge girders and components - High-rise building frames - Industrial plant structural members - Seismic-resistant moment frames **Heavy Equipment Manufacturing:** - Crane boom sections - Excavator structural components - Mining equipment frames - Heavy press structural members **Transportation Infrastructure:** - Long-span bridge components - Heavy-duty sign supports - Railway bridge elements - Tunnel support structures **Energy and Power Generation:** - Power plant structural supports - Wind turbine tower sections - Hydroelectric dam components - Transmission tower structures **Marine and Offshore:** - Ship building components - Offshore platform members - Dock and pier structures - Port facility components --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: Requires proper procedure control - **Preheat Requirements**: 150-200°F for thicknesses over ¾ inch - **Recommended Processes**: SMAW, GMAW, FCAW, SAW - **Filler Metals**: E70XX or E80XX series electrodes **Forming & Machining:** - **Moderate Formability**: Requires adequate power for forming operations - **Bend Radius**: Typically 2.5t for 90° bends - **Machinability**: Fair (approximately 55% of B1112 steel) - **Shearing & Punching**: Requires robust equipment design **Heat Treatment:** - Normally supplied in as-rolled condition - Normalizing available for enhanced properties - Stress relieving recommended for complex welded structures **Quality Certification:** - Charpy V-Notch impact testing required - Multiple tests per plate as specified - Full mechanical property certification provided --- ### **Technical Summary** ASTM A573 Grade 70 represents the premium grade in the improved toughness carbon steel plate series, offering an optimal balance of high strength and enhanced impact resistance. The grade's carefully controlled chemistry, particularly the elevated manganese content, provides increased strength while maintaining the improved toughness characteristics that define the A573 specification. This combination makes it particularly valuable for structural applications subject to dynamic loading, vibration, or potential impact conditions where both strength and reliability are critical. While fabrication requires more careful procedure control compared to lower grades, the enhanced mechanical properties provide significant advantages in weight-sensitive designs and high-stress applications. The material's certified impact properties and consistent performance have established ASTM A573 Grade 70 as a preferred choice for critical structural components in bridge construction, heavy equipment, and industrial structures where safety and durability are paramount considerations. -:- For detailed product information, please contact sales. -: ASTM A573 Steel, grade 70 Specification Dimensions Size： Diameter 20-1000 mm Length <4300 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 A573 Steel, grade 70 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A573 Steel Seamless tube, grade 70 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A573 Steel Seamless tube, grade 70 -:- For detailed product information, please contact sales. -:

Packing of ASTM A573 Steel Seamless tube, grade 70 -:- 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 771 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