SAE J434 D4018 Ductile Iron Wire

SAE J434 D4018 Ductile Iron Wire Product Information -:- For detailed product information, please contact sales. -: SAE J434 D4018 Ductile Iron Wire Synonyms -:- For detailed product information, please contact sales. -:

SAE J434 D4018 Ductile Iron Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: SAE J434 D4018 Ductile Iron** **SAE J434 D4018** is a standardized automotive-grade ductile iron (also known as nodular or spheroidal graphite iron) specification. The “D4018” designation is a **mechanical property code** where “D” indicates ductile iron, “40” represents the **minimum tensile strength in ksi (40,000 psi)**, and “18” indicates the **minimum elongation percentage (18%)**. This grade represents a classic **ferritic ductile iron**, prized for its exceptional combination of good strength, high ductility, excellent impact resistance (even at low temperatures), and superior machinability. It is a foundational material for automotive components requiring durability, reliability, and cost-effectiveness. --- ### **1. Key International Standards & Designations** * **Primary Standard:** **SAE J434 - Automotive Ductile (Nodular) Iron Castings** * This standard establishes the mechanical property and hardness requirements for various grades of automotive ductile iron. * **Grade Designation:** **D4018** * **Equivalent/Analogous Standards:** * **ASTM A536:** **65-45-12** is the closest and most widely recognized equivalent. (65 ksi Tensile, 45 ksi Yield, 12% Elongation). SAE D4018 (40-xx-18) and ASTM 65-45-12 have overlapping property ranges and similar microstructures. * **ISO 1083/JS:** **EN-GJS-400-18** or **JS/400-18** are the direct international equivalents. * **UNS:** **F32800** (This UNS designation is typically associated with the ferritic ductile iron grades like 60-40-18 and 65-45-12). * **Common Names:** Ferritic Ductile Iron, 65-45-12 Grade Ductile Iron, High-Ductility Nodular Iron. --- ### **2. Chemical Composition (Typical Ranges for D4018)** SAE J434 does not mandate strict chemical composition limits for each grade; it is performance-based (mechanical properties). However, the chemistry is controlled by the foundry to consistently achieve the required ferritic microstructure and properties. A typical composition is as follows: | Element | Typical Range (% by Weight) | Purpose & Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.9 | Provides graphite for the nodular structure. Higher carbon promotes graphitization and castability. | | **Silicon (Si)** | 2.3 - 2.8 | The primary ferritizing agent. Promotes the formation of a ferritic matrix, which gives high ductility and toughness. | | **Manganese (Mn)** | 0.10 - 0.30 | Kept deliberately **low** to prevent the formation of pearlite or carbides, which would reduce ductility and impact toughness. | | **Phosphorus (P)** | 0.03 Max (≤0.035) | Very low to prevent the formation of brittle iron phosphides at grain boundaries. | | **Sulfur (S)** | 0.01 - 0.02 Max | Extremely low. Essential for successful magnesium treatment (nodularization) to form spheroidal graphite. | | **Magnesium (Mg)** | 0.03 - 0.05 (Residual) | **The essential nodulizing element.** Added as a treatment alloy to ensure graphite forms as spheres, not flakes. | | **Copper (Cu)** | < 0.10 (Often) | Minimized in this grade, as copper is a pearlite promoter. Traces may be present. | | **Nickel (Ni)** | < 0.10 (Often) | Minimized for cost and to maintain a fully ferritic structure. | **Microstructural Requirement:** The matrix must be **predominantly ferritic** (typically >90% ferrite) to achieve the high elongation and impact values. --- ### **3. Mechanical & Physical Properties** **A. Mechanical Properties (Minimum Requirements per SAE J434 for D4018):** * **Tensile Strength:** **40 ksi min (276 MPa min)** * *(Note: While the grade is “40”, the actual tensile strength achieved is typically in the 65-75 ksi (450-520 MPa) range to comfortably meet yield and elongation targets.)* * **Yield Strength (0.2% Offset):** **40 ksi min (276 MPa min)** * *(In practice, yield strength is typically 45-55 ksi / 310-380 MPa.)* * **Elongation (% in 2 inches / 50mm):** **18% min** * This is the defining characteristic, often reaching 20-25% in well-produced castings. * **Hardness (Typical Range):** 156 - 217 HB (Approx. 83 - 95 HRB) * **Impact Energy (Charpy V-Notch):** Excellent. Often exceeds 20 ft-lb (27 J) at room temperature and maintains good toughness down to -40°F/C. **B. Typical Physical Properties:** * **Density:** ~7.1 - 7.2 g/cm³ * **Melting Range:** ~1120 - 1180 °C * **Modulus of Elasticity:** 24 - 25 x 10⁶ psi (165 - 172 GPa) * **Coefficient of Thermal Expansion:** ~6.3 x 10⁻⁶ /°C (20-200°C) * **Machinability:** **Excellent.** The soft, ferritic matrix and lubricating graphite nodules allow for high-speed machining, long tool life, and good surface finish. --- ### **4. Key Characteristics & Advantages** * **High Ductility & Toughness:** The 18%+ elongation and excellent impact resistance make it highly resistant to shock loading and brittle fracture. * **Excellent Low-Temperature Performance:** The fully ferritic structure retains toughness well below freezing, making it suitable for components in all climates. * **Superior Machinability:** Among the most machinable grades of ductile iron, reducing manufacturing costs. * **Good Damping Capacity:** Effectively absorbs vibrational energy, beneficial for dynamic components. * **Good Fatigue Strength:** Suitable for parts undergoing cyclic loading. * **Pressure Tightness:** Suitable for hydraulic and pneumatic components. --- ### **5. Typical Applications** SAE J434 D4018 is a workhorse material in the automotive and heavy vehicle industries for non-gearing, high-integrity components. * **Automotive & Truck:** * **Steering Knuckles and Housings** (critical safety components requiring high toughness). * **Brake Calipers and Brackets.** * **Suspension Components:** Control arms, brackets, and links. * **Differential Carriers and Cases.** * **Wheel Hubs.** * **Exhaust Manifolds** (for lower-temperature applications). * **Agriculture & Off-Highway:** * **Tractor Linkages and Housings.** * **Hydraulic Valve Bodies and Manifolds.** * **General Engineering:** * **Pump Housings** for non-abrasive services. * **General Machinery Brackets and Levers** requiring high reliability. --- ### **6. Heat Treatment** Castings are often used in the **as-cast** condition if the cooling rate is controlled to produce a fully ferritic matrix. To guarantee properties, a **ferritizing anneal** heat treatment is commonly employed: * Heated above the upper critical temperature, held to dissolve any carbides/pearlite, then slowly cooled or held in the ferrite region to transform all carbon into graphite and ferrite. --- ### **Summary** **SAE J434 D4018 (and its equivalents ASTM 65-45-12 / EN-GJS-400-18) defines a high-ductility, fully ferritic grade of ductile iron.** It is the material of choice when the design priorities are **impact resistance, reliability under dynamic loads, excellent machinability, and cost-effectiveness** over raw tensile strength. Its balanced property profile makes it a cornerstone material for safety-critical and high-integrity structural components across the transportation and mobile equipment industries. -:- For detailed product information, please contact sales. -: SAE J434 D4018 Ductile Iron Specification Dimensions Size： Diameter 20-1000 mm Length <6600 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. -: SAE J434 D4018 Ductile Iron Properties -:- For detailed product information, please contact sales. -:

Applications of SAE J434 D4018 Ductile Iron Wire -:- For detailed product information, please contact sales. -: Chemical Identifiers SAE J434 D4018 Ductile Iron Wire -:- For detailed product information, please contact sales. -:

Packing of SAE J434 D4018 Ductile Iron 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 3071 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