Iron Flange SAE J434c Grade D4018

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. -: Ductile Iron Flange SAE J434c Grade D4018 Product Information -:- For detailed product information, please contact sales. -: Ductile Iron Flange 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 Flange SAE J434c Grade D4018 -:- For detailed product information, please contact sales. -: Chemical Identifiers Ductile Iron Flange SAE J434c Grade D4018 -:- For detailed product information, please contact sales. -:

Packing of Ductile Iron Flange 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 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 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