Iron Wire SAE J434c Grade D4018

Ductile Iron Wire SAE J434c Grade D4018 Product Information -:- For detailed product information, please contact sales. -: Ductile Iron Wire SAE J434c Grade D4018 Synonyms -:- For detailed product information, please contact sales. -:

Ductile Iron SAE J434c Grade D4018 Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: Ductile Iron (Nodular Iron) – SAE J434c Grade D4018** --- #### **1. Product Overview** SAE J434c Grade **D4018** is a **ferritic ductile iron** specification defined by the Society of Automotive Engineers (SAE) for use primarily in the automotive and allied transportation industries. The designation "D4018" follows the SAE convention where the numeric code indicates the **minimum tensile strength (40 ksi) and minimum elongation (18%)**. It is the direct SAE equivalent to the widely used **ASTM A536 60-40-18** grade. This material offers an excellent balance of strength, high ductility, and good impact resistance, making it the preferred choice for safety-critical components that must withstand shock loads and dynamic stresses. Its fully ferritic matrix, achieved through annealing, provides superior machinability and consistent performance. #### **2. Governing Standards & Specifications** This grade is explicitly defined by automotive-focused standards, with clear cross-equivalencies to international grades. * **Primary Standard: SAE J434c** - *Ductile Iron Castings* (Automotive Standard). The grade is designated as **D4018**. The "c" revision is commonly referenced, though later versions exist. * **Direct Cross-Equivalencies:** * **ASTM A536:** **Grade 60-40-18** (60 ksi tensile, 40 ksi yield, 18% elongation). * **ISO 1083 / EN 1563:** **EN-GJS-400-18** or **JS/1050-06**. * **SAE J434 also lists D4018 as equivalent to ASTM 60-40-18 and UNS F32800.** * **Key Testing Standards (as referenced by SAE):** * **Tensile Test:** ASTM E8. * **Hardness:** ASTM E10 (Brinell). * **Microstructure:** ASTM A247 (Nodularity typically >80%, Type I & II graphite). * **Material System:** UNS (Unified Numbering System) **F32800**. #### **3. Typical Chemical Composition** Chemistry is controlled to ensure a fully ferritic matrix after annealing, with tight limits on pearlite-promoting elements. | Element | SAE J434c Typical Range (%) | Functional Role for D4018 | | :--- | :--- | :--- | | **Carbon (C)** | 3.40 - 3.80 | Ensures castability and graphite formation. | | **Silicon (Si)** | 2.30 - 2.80 | Strong ferritizer. Higher Si promotes the ferritic matrix but is balanced to avoid low-temperature embrittlement. | | **Manganese (Mn)** | **≤ 0.40** | Kept low to prevent pearlite stabilization and boundary segregation, which would reduce ductility and impact strength. | | **Phosphorus (P)** | **≤ 0.05** | Kept low to prevent the formation of brittle phosphide networks at grain boundaries. | | **Sulfur (S)** | **≤ 0.02** | Kept very low to avoid interference with magnesium nodulization. | | **Magnesium (Mg)** | Residual (0.03 - 0.05 typical) | Essential nodulizing element. | | **Copper (Cu)** | **≤ 0.20** (often <0.10) | Minimized, as it is a potent pearlite promoter. | | **Nickel (Ni)** | Report (often ≤0.50) | May be present; not intentionally added for this grade. | | **Chromium (Cr)** | **≤ 0.10** | Strictly limited, as it is a strong carbide former and pearlite stabilizer. | #### **4. Physical & Mechanical Properties** The properties define a high-ductility, tough engineering material. | Property | SAE J434c D4018 Requirement | Typical Value / Notes | | :--- | :--- | :--- | | **Tensile Strength, min.** | **414 MPa (60,000 psi)** | | | **Yield Strength (0.2% offset), min.** | **276 MPa (40,000 psi)** | High yield-to-tensile ratio (~0.67). | | **Elongation, min.** | **18%** (in 2 inches / 50 mm) | **Key characteristic:** High ductility. | | **Hardness (Brinell)** | **143 - 187 HBW** | Specified range ensures machinability and the correct ferritic structure. | | **Modulus of Elasticity** | 165 - 172 GPa (24 - 25 x 10⁶ psi) | Typical for ductile iron. | | **Charpy Impact (Unnotched)** | Not typically specified in SAE, but generally **15-25 J @ 21°C** | Good impact resistance inherent to the ferritic structure. | | **Fatigue Strength** | ~210 - 240 MPa (Est. 0.5-0.55 x UTS) | Good performance for dynamically loaded parts. | | **Density** | 7.1 - 7.2 g/cm³ (0.256 lb/in³) | | | **Microstructure** | **Primarily Ferrite** (>90%) with **spheroidal graphite** (Nodularity >80%, Type I & II per ASTM A247). | The ferritic matrix is responsible for the high elongation and toughness. | #### **5. Product Applications** SAE D4018 is extensively used in automotive and heavy vehicle components where reliability under cyclic and impact loading is critical. * **Automotive Drivetrain & Chassis:** **Differential carriers, axle housings, steering knuckles, wheel hubs, brake calipers, suspension brackets.** Its toughness absorbs road shock and impact loads. * **Commercial Vehicles:** **Heavy-duty truck axle components, fifth-wheel assemblies, engine mounting brackets.** * **Agricultural & Off-Highway Machinery:** **Tractor front axle supports, transmission cases, implement linkage parts.** * **General Industrial:** **Hydraulic valve bodies, pump housings, compressor frames** where pressure integrity and machinability are valued. * **Pipe & Fittings:** Although more common under ASTM specs, it is applicable for **ductile iron pipe fittings** requiring high ductility. #### **6. Fabrication & Heat Treatment Notes** * **Condition:** Supplied in the **Annealed (ferritized)** condition to meet the hardness and microstructure requirements. This involves heating to austenitizing temperature and slow cooling to transform the matrix to ferrite. * **Machinability:** **Excellent.** The soft ferritic matrix and graphite nodules that act as chip breakers result in low tool wear, good surface finish, and high machining speeds. * **Weldability:** **Fair, with strict procedures.** Pre-heat (315-650°C) and post-weld stress relief are mandatory. Use nickel-iron (e.g., ENi-CI) or special ductile iron electrodes. Welding is generally for repair, not fabrication. #### **7. Ordering & Quality Assurance (Automotive Focus)** In the automotive context, ordering involves additional quality mandates. **Specify:** **"Ductile Iron Castings, SAE J434c Grade D4018 (ASTM 60-40-18 equivalent), Annealed."** **Critical Requirements for Automotive Supply:** * **Material Certification:** Mill Test Report (MTR) confirming chemistry and mechanical properties per SAE J434c. * **Process Certification:** Evidence of proper nodularizing and annealing cycles. * **Statistical Process Control (SPC):** Foundries typically must provide data for key parameters (e.g., hardness, nodularity). * **Dimensional Validation:** First Article Inspection Report (FAIR) and ongoing PPAP (Production Part Approval Process) documentation as required by customer (e.g., following AIAG or VDA standards). * **Non-Destructive Testing (NDT):** May be specified for critical areas (e.g., magnetic particle inspection for surface defects on stressed areas). **SAE J434c Grade D4018 is the automotive industry's benchmark specification for high-ductility ferritic ductile iron, ensuring consistent, reliable material quality for safety-critical cast components.** -:- For detailed product information, please contact sales. -: Ductile Iron SAE J434c Grade D4018 Specification Dimensions Size： Diameter 20-1000 mm Length <6524 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. -: Ductile Iron SAE J434c Grade D4018 Properties -:- For detailed product information, please contact sales. -:

Applications of Ductile Iron Wire SAE J434c Grade D4018 -:- For detailed product information, please contact sales. -: Chemical Identifiers Ductile Iron Wire SAE J434c Grade D4018 -:- For detailed product information, please contact sales. -:

Packing of Ductile Iron Wire SAE J434c Grade D4018 -:- 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 2995 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