ASTM A27 Grade 70-40 Cast Carbon Steel Flange

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 A27 Grade 70-40 Cast Carbon Steel Flange Product Information -:- For detailed product information, please contact sales. -: ASTM A27 Grade 70-40 Cast Carbon Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

ASTM A27 Grade 70-40 Cast Carbon Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Datasheet: ASTM A27 Grade 70-40 Cast Carbon Steel** ## **1. Product Overview** **ASTM A27 Grade 70-40** is a standard grade of **medium-strength cast carbon steel** specified for general-purpose applications where high ductility and excellent weldability are prioritized over ultimate strength. It is one of the most commonly used grades within the ASTM A27 specification for steel castings, valued for its reliability, cost-effectiveness, and ease of fabrication. The grade designation "70-40" indicates the **minimum tensile strength of 70 ksi (485 MPa)** and the **minimum yield strength of 40 ksi (275 MPa)**. Castings are typically supplied in the as-cast, normalized, or annealed condition, making them suitable for a wide range of non-critical to moderately stressed components. ## **2. Governing International Standard** This material is defined and governed by the **ASTM A27 / A27M – Standard Specification for Steel Castings, Carbon, for General Application**. This standard covers carbon steel castings for general industrial use that require weldability, pressure tightness, and machinability. Grade 70-40 represents a key strength level within this widely adopted international specification. ## **3. Chemical Composition** The chemical composition is controlled to ensure good castability, soundness, and mechanical properties. The requirements as per ASTM A27 for Grade U-415-205 (70-40) are as follows (in weight %, maximum unless range is given): * **Carbon (C):** 0.25% max * **Manganese (Mn):** 0.70% min / 1.20% max * **Silicon (Si):** 0.80% max * **Phosphorus (P):** 0.05% max * **Sulfur (S):** 0.06% max * **Residual Elements:** Copper (Cu) ≤ 1.00%; Nickel (Ni) ≤ 0.50%; Chromium (Cr) ≤ 0.50%; Molybdenum (Mo) ≤ 0.25%; Vanadium (V) ≤ 0.05% (combined ≤ 1.00%). **Note:** The low carbon content is a defining feature, ensuring superior weldability and toughness. ## **4. Physical & Mechanical Properties** * **Minimum Mechanical Properties (as per ASTM A27):** * **Tensile Strength:** 70 ksi (485 MPa) * **Yield Strength (0.2% Offset):** 40 ksi (275 MPa) * **Elongation in 2" (50 mm):** 22% min * **Reduction of Area:** 30% min * **Typical Achieved Properties:** * **Hardness:** Typically 143 - 187 HBW (Brinell Hardness) in the normalized condition. * **Modulus of Elasticity:** 29 x 10⁶ psi (200 GPa) * **Poisson's Ratio:** 0.29 * **Density:** 7.85 g/cm³ * **Impact Resistance:** Exhibits good notch toughness at room temperature. * **Common Heat Treatments:** Castings are often used in the **normalized** or **annealed** state to refine the as-cast grain structure, improve uniformity, and relieve stresses. The **as-cast** condition is also permissible if mechanical property tests are met. ## **5. Key Characteristics & Engineering Advantages** * **Excellent Weldability and Formability:** The low carbon content makes this grade highly suitable for welding and other fabrication processes without extensive preheat or post-weld heat treatment requirements, minimizing cracking risk. * **High Ductility and Toughness:** The high minimum elongation and reduction of area provide excellent resistance to brittle fracture and good energy absorption, making it forgiving under overload conditions. * **Good Pressure Tightness:** Properly produced castings exhibit good soundness, making the grade suitable for components requiring pressure integrity (e.g., valve bodies, pump casings). * **Superior Machinability:** Its moderate hardness and uniform microstructure allow for excellent machinability with standard tooling, resulting in good surface finishes and lower production costs. * **Cost-Effective:** As a general-purpose carbon steel with simple composition and heat treatment requirements, it is one of the most economical choices for steel castings. ## **6. Typical Applications** ASTM A27 Grade 70-40 is a versatile workhorse material used across numerous industries for non-critical, general structural, and pressure-containing parts: * **Valves, Pumps, and Fittings:** Bodies, bonnets, casings, and flanges for low-to-medium pressure water, oil, and gas services. * **General Machinery:** Gear blanks, machine bases, brackets, housings, and frames that require good machinability and stability. * **Railroad and Transportation:** Non-wearing structural components, coupler parts, and suspension components. * **Construction and Mining:** Support brackets, sheave wheels, and other components not subject to severe impact or abrasion. * **Marine and Offshore:** Deck fittings, pipe supports, and other general structural castings. * **Agricultural Equipment:** Housings, structural mounts, and linkage components. ## **7. Summary** **ASTM A27 Grade 70-40** is the quintessential **general-purpose cast carbon steel**. Its primary strengths lie not in high strength, but in its **exceptional combination of weldability, ductility, machinability, and cost-effectiveness**. Engineers and designers specify this grade for applications where reliability, ease of fabrication, and overall value are paramount, and where the mechanical property requirements are adequately met by its 70 ksi tensile and 40 ksi yield strength. For countless non-specialized components, it remains a default and trusted material choice in the casting industry. -:- For detailed product information, please contact sales. -: ASTM A27 Grade 70-40 Cast Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5857 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 A27 Grade 70-40 Cast Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A27 Grade 70-40 Cast Carbon Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A27 Grade 70-40 Cast Carbon Steel Flange -:- For detailed product information, please contact sales. -:

Packing of ASTM A27 Grade 70-40 Cast Carbon Steel Flange -:- 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 2328 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