ASTM A573 Steel Flange, grade 70

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: ASTM A573 Steel Flange, grade 70 Product Information -:- For detailed product information, please contact sales. -: ASTM A573 Steel Flange, 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 Flange, grade 70 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A573 Steel Flange, grade 70 -:- For detailed product information, please contact sales. -:

Packing of ASTM A573 Steel Flange, 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 Flange 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