ASTM A27 Grade 70-40 Cast Carbon Steel Wire

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

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