ASTM A439 Austenitic Ductile Iron Flange type D5S

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 A439 Austenitic Ductile Iron Flange type D5S Product Information -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron Flange type D5S Synonyms -:- For detailed product information, please contact sales. -:

ASTM A439 Austenitic Ductile Iron type D5S Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Data Sheet: ASTM A439 Austenitic Ductile Iron – Type D-5S** --- ## **1. Product Overview** **ASTM A439 Type D-5S Austenitic Ductile Iron** is a **silicon-modified, high-nickel austenitic spheroidal graphite iron** specifically engineered for **superior resistance to high-temperature oxidation, carburization, and sulfur attack**. The "S" designation signifies its **specialized composition optimized for severe thermal service**, particularly in carburizing and sulfidizing atmospheres up to 980°C (1800°F). By incorporating elevated silicon and chromium levels within the high-nickel D-5 matrix, this alloy forms exceptionally stable, self-healing oxide scales that resist penetration by carbon and sulfur, making it the premier choice for high-temperature furnace components and heat treatment fixtures where other austenitic grades would degrade rapidly. --- ## **2. Governing Standards & Specifications** Type D-5S is a specialized high-temperature variant within the ASTM A439 family. * **Primary Standard:** * **ASTM A439** - *Standard Specification for Austenitic Ductile Iron Castings* * **International & Commercial Equivalents:** * **ISO 2892:** *Austenitic cast irons* – While not a direct 1:1 match, it falls under high-silicon, high-nickel types such as **L-NiSiCr 35 5 2**. * **Common Trade Name:** **Ni-Resist® Type D-5S** (High-Temperature, Heat-Resisting Grade). * **SAE J434:** **D5S** is a recognized automotive material specification for this alloy. * **Key Referenced Testing Standards:** * **ASTM E8/E21:** Tensile Testing * **ASTM E228:** Linear Thermal Expansion Testing * **ASTM G54:** Static Oxidation Testing * **ASTM G79:** Evaluation of Susceptibility to Embrittlement of Steels and Nickel-Base Alloys --- ## **3. Chemical Composition Requirements** Type D-5S features a balanced chemistry that prioritizes high-temperature stability over room-temperature mechanical properties. | Element | Composition Range (wt.%, Typical) | Functional Role & Metallurgical Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 2.40 - 2.90 | Controlled to balance graphite formation and matrix stability. Higher carbon can promote carbide formation at high temperatures. | | **Silicon (Si)** | **4.80 - 5.50** | **The Key High-Temperature Additive.** Silicon promotes the formation of a dense, adherent SiO₂ layer within the scale. This layer **dramatically improves resistance to carburization (carbon pickup) and sulfidation**, and enhances overall oxidation resistance at extreme temperatures. | | **Nickel (Ni)** | **34.00 - 36.00** | **Primary Austenite Stabilizer.** Ensures a fully austenitic matrix that remains stable and ductile at all service temperatures, preventing detrimental phase transformations. Provides the base for low thermal expansion. | | **Chromium (Cr)** | **1.75 - 2.50** | Works synergistically with silicon to form a complex, protective (Cr,Si)₂O₃ scale that is highly resistant to spallation and penetration by aggressive species. Provides solid solution strengthening. | | **Manganese (Mn)** | 0.50 - 1.50 | Austenite stabilizer. | | **Copper (Cu)** | ≤ 0.50 | Kept low, as copper can be detrimental to high-temperature properties. | | **Magnesium (Mg)** | ≥ 0.07 (min., residual) | Ensures spheroidal graphite. | | **Phosphorus (P)** | ≤ 0.08 | Kept very low to avoid low-melting eutectics. | | **Sulfur (S)** | ≤ 0.03 | Kept very low. | *Note: Exact ranges may vary slightly by foundry; the SAE J434 D5S specification is a common reference.* --- ## **4. Physical & Mechanical Properties** Type D-5S is optimized for performance at elevated temperatures, with properties that reflect this focus. | Property | Typical Value / Range | Key Characteristics & High-Temperature Performance | | :--- | :--- | :--- | | **Tensile Strength (RT)** | **450 - 550 MPa (65 - 80 ksi)** | Good room-temperature strength, enhanced by silicon solid solution strengthening. | | **Yield Strength (RT, 0.2%)** | **250 - 350 MPa (36 - 51 ksi)** | Higher than standard D-5 due to silicon strengthening. | | **Elongation (RT)** | **8 - 15%** | Moderate ductility; sufficient for handling and service but lower than non-silicon-modified grades. | | **Hardness (Brinell, HBW)** | **170 - 230 HBW** | Higher than D-5, reflecting the strengthened matrix. | | **Coefficient of Thermal Expansion (20-400°C)** | **~10.0 - 11.5 x 10⁻⁶ /°C** | **Retains the low-CTE characteristic of the D-5 family**, crucial for thermal cycling applications. Slightly higher than D-5 due to Si. | | **Maximum Recommended Service Temperature** | **980°C (1800°F) Continuous** | **Superior to D-5 (~800°C).** The Si+Cr scale allows sustained operation in oxidizing, carburizing, and sulfidizing atmospheres. | | **Oxidation & Growth Resistance** | **Outstanding.** Minimal scaling and virtually no "growth" (permanent swelling from internal oxidation of graphite) due to the highly protective scale. Weight gain in standard oxidation tests is exceptionally low. | | **Carburization Resistance** | **Excellent.** The silicon-rich scale acts as an effective barrier against carbon diffusion into the matrix, preventing embrittlement and property degradation in furnace atmospheres. | | **Sulfidation Resistance** | **Very Good.** Superior to most other cast ferrous alloys in sulfur-bearing environments. | | **Thermal Fatigue Resistance** | **Excellent.** The combination of low CTE, good high-temperature strength, and scale adherence provides excellent resistance to crack initiation under thermal cycling. | | **Impact Resistance (RT)** | **Moderate.** Adequate for fixture applications but not for high shock loads. | | **Machinability** | **Fair to Difficult.** The high silicon content creates an abrasive, work-hardening matrix. Requires carbide tooling, rigid setups, and correct parameters. | --- ## **5. Product Applications** Type D-5S is the material of choice for the most demanding high-temperature fixture and component applications. * **Heat Treatment & Industrial Furnaces (Primary Market):** * **Fixtures, baskets, trays, and grids** for carburizing, carbonitriding, and neutral hardening furnaces. * **Rotor fans, radiant tubes, and retorts** for continuous furnaces. * **Pit furnace fixtures and charge carriers.** * **Chemical & Petrochemical Processing:** * **Reformer tube hangers, catalyst support grids, and internals** for steam methane reformers and ethylene crackers. * **Power Generation:** * **Components for high-temperature heat recovery systems.** * **Automotive (Specialized):** * **High-performance turbocharger housings and exhaust manifolds** for extreme-duty applications. --- ## **6. Fabrication & Processing Notes** * **Condition:** Typically supplied **as-cast and solution annealed**. A high-temperature solution anneal (1100-1150°C) is crucial to dissolve any secondary carbides/silicides and ensure a homogeneous austenitic structure for optimal high-temperature performance and ductility. * **"Conditioning" or "Pre-oxidation" Treatment:** For the absolute best in-service performance, a controlled pre-oxidation treatment may be applied to grow a uniform, protective scale before the component enters service, minimizing initial oxidation rates. * **Casting Considerations:** High silicon content improves fluidity but increases shrinkage tendency. Requires expert foundry practice for sound castings. The alloy is reactive; basic or neutral molding aggregates are preferred. * **Machinability:** **Challenging.** Abrasive and prone to work hardening. **Carbide tooling is mandatory.** Use positive rake angles, moderate speeds, and consistent feed to avoid glazing the work surface. * **Weldability:** **Very Poor (Generally Not Recommended).** The high Si and Ni content make it extremely prone to hot cracking and fissuring in the HAZ. The HAZ will also lose its optimized high-temperature properties. **Design for casting integrity; welding should be avoided for service components.** If repair is unavoidable, it requires extremely specialized procedures and full re-solution annealing. --- ## **7. Ordering Information** **Specify:** **"Austenitic Ductile Iron Castings, ASTM A439/SAE J434 Type D-5S (Ni-Resist D-5S), Solution Annealed."** **Critical Details to Provide:** * **Applicable Standard** (e.g., SAE J434 D5S or reference to ASTM A439 D-5S composition). * **Mandatory Heat Treatment:** "Solution Annealed" is non-negotiable. * **Part Drawing & Specification.** * **Service Conditions:** Maximum temperature, atmosphere type (e.g., endothermic gas, air, sulfidizing), and thermal cycling profile. * **Certification Requirements:** MTR with full chemical analysis (confirming high Si), mechanical properties, and heat treatment records. For critical applications, **high-temperature oxidation or carburization test reports** may be required. * **Special Processing:** Specify if a **pre-oxidation treatment** is required. --- ## **8. Summary: The High-Temperature Specialist** **ASTM A439/SAE D5S represents the ultimate in high-temperature performance among the standard austenitic ductile irons. Its value proposition is clear:** * **Primary Advantage:** **Unmatched combination of low thermal expansion, exceptional resistance to oxidation/carburization/sulfidation, and microstructural stability at temperatures up to 980°C.** * **Comparison to D-5:** D-5S **sacrifices some room-temperature ductility and machinability** to gain **vastly superior high-temperature environmental resistance**. It is the choice when the service environment is aggressively hot and chemically active. * **Comparison to D-2C:** While D-2C also offers good high-temperature resistance, **D-5S provides significantly lower thermal expansion** (critical for fixtures and dimensional stability) and even better carburization resistance due to its higher silicon content. * **Economic Note:** It is a **premium material** due to its high Ni and specialized processing, justified by extended service life in critical furnace applications. **Type D-5S is not a general-purpose alloy; it is a precision-engineered solution for extending the life and reliability of components in the most punishing thermal environments found in industrial heat processing.** -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron type D5S Specification Dimensions Size： Diameter 20-1000 mm Length <6559 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 A439 Austenitic Ductile Iron type D5S Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A439 Austenitic Ductile Iron Flange type D5S -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A439 Austenitic Ductile Iron Flange type D5S -:- For detailed product information, please contact sales. -:

Packing of ASTM A439 Austenitic Ductile Iron Flange type D5S -:- 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 3030 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