ASTM A439 Austenitic Ductile Iron Flange type D4

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 D4 Product Information -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron Flange type D4 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A439 Austenitic Ductile Iron type D4 Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Data Sheet: ASTM A439 Austenitic Ductile Iron – Type D-4** --- ## **1. Product Overview** **ASTM A439 Type D-4 Austenitic Ductile Iron** is a **medium-nickel, medium-chromium austenitic spheroidal graphite iron** designed to provide an **optimal balance of cost, corrosion resistance, and mechanical properties**. With a nickel content significantly lower than the D-3 series but higher than the D-2 series, Type D-4 represents a **strategic economic choice** for applications requiring reliable performance in moderately corrosive environments—particularly alkaline and seawater services—where the premium cost of high-nickel grades cannot be justified. It maintains the essential austenitic characteristics of good ductility, non-magnetic properties, and thermal stability while offering improved mechanical strength over higher-nickel counterparts. --- ## **2. Governing Standards & Specifications** Type D-4 is a standardized, commercially important grade within the austenitic ductile iron family. * **Primary Standard:** * **ASTM A439** - *Standard Specification for Austenitic Ductile Iron Castings* * **International & Commercial Equivalents:** * **ISO 2892:** *Austenitic cast irons* – Type D-4 corresponds to **L-NiCr 30 3**. * **EN 13835:** *Austenitic cast irons* – Designated as **EN-JS 2030**. * **Common Trade Name:** **Ni-Resist® Type D-4**. * **Key Referenced Testing Standards:** * **ASTM E8:** Tensile Testing * **ASTM E10:** Brinell Hardness * **ASTM A247:** Microstructure Evaluation * **ASTM G48:** Pitting and Crevice Corrosion Resistance Testing --- ## **3. Chemical Composition Requirements (per ASTM A439)** The composition of D-4 is defined by its moderate nickel and chromium levels, which define its performance and cost profile. | Element | Composition Range (wt.%, ASTM A439) | Functional Role & Metallurgical Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 2.50 - 3.00 | Provides graphite for machinability and damping; balanced to maintain matrix integrity. | | **Silicon (Si)** | 1.50 - 2.50 | Standard range for graphitization and solid solution strengthening. | | **Nickel (Ni)** | **18.00 - 22.00** | **Primary Austenite Stabilizer.** This intermediate level is sufficient to maintain a fully austenitic matrix under most service conditions, providing good ductility, toughness, and a base level of corrosion resistance at a lower cost than D-3 grades. | | **Chromium (Cr)** | **1.50 - 2.50** | Provides oxidation resistance and strengthens the matrix via solid solution. Enhances pitting resistance in chloride environments. Lower than in D-3, reflecting a balanced approach. | | **Manganese (Mn)** | 0.50 - 1.50 | Austenite stabilizer and sulfur control. | | **Copper (Cu)** | **≤ 0.50** | Low residual level. | | **Magnesium (Mg)** | ≥ 0.07 (min., residual) | Ensures spheroidal graphite formation. | | **Phosphorus (P)** | ≤ 0.08 | Kept low. | | **Sulfur (S)** | ≤ 0.03 | Kept low. | **Note:** There is some potential for confusion in historical references. The composition shown above is for the standard **ASTM A439 Type D-4**. It is crucial to distinguish this from **Type D-4A**, which has a similar Ni range but **very high silicon (5.0-6.0%)** for sulfuric acid resistance (analogous to the D-3/D-3A relationship). --- ## **4. Physical & Mechanical Properties** Type D-4 offers robust mechanical properties with good corrosion resistance, representing a practical engineering compromise. | Property | Typical Value / Range for D-4 | Key Characteristics & Market Position | | :--- | :--- | :--- | | **Tensile Strength, min.** | **414 MPa (60,000 psi)** | Good load-bearing capacity; typical values often range 450-550 MPa. | | **Yield Strength (0.2% offset), min.** | **207 MPa (30,000 psi)** | Adequate for most structural applications; typical yield is higher. | | **Elongation, min.** | **15%** | Good ductility, allowing it to withstand thermal stress and minor deformation. | | **Hardness (Brinell, HBW)** | **140 - 200 HBW** | Similar to D-2, ensuring good machinability. | | **Modulus of Elasticity** | **~115 - 125 GPa** | Low modulus characteristic of austenitic structures. | | **Impact Resistance** | **Good.** Maintains useful toughness for engineering components. | | **Corrosion Resistance** | **Very Good in Specific Environments:**
• **Excellent resistance to alkalis and caustic solutions** (though not as robust as D-3 in hottest, most concentrated service).
• **Very good resistance to seawater, brines, and marine atmospheres.** A cost-effective choice for many marine applications.
• Good resistance to dilute sulfuric, phosphoric, and organic acids at moderate temperatures.
• **Not recommended for strong oxidizing acids** (e.g., nitric) or highly reducing acids (e.g., hydrochloric). | | **Maximum Service Temperature** | **~800°C (1470°F) Continuous** | Good oxidation resistance for many high-temperature applications. | | **Non-Magnetic Property** | **Excellent.** Fully austenitic with very low permeability. | | **Coefficient of Thermal Expansion** | **~17 x 10⁻⁶ /°C** | High, requiring design accommodation. | | **Thermal Conductivity** | **~13 W/m·K** | Low. | --- ## **5. Product Applications** Type D-4 is a versatile, widely used grade for moderate corrosion and marine applications. * **Marine & Offshore:** * **Seawater pump casings, impellers, valve bodies, and fittings.** A standard, economical choice for seawater systems. * **Propeller shaft sleeves, stern tubes, underwater housings.** * **Chemical Processing:** * **Equipment for handling alkaline solutions, brines, and mild acids.** * **Evaporator bodies, crystallizers, and piping** in salt and caustic service. * **Power Generation:** * **Cooling water system components, condenser plates, and fittings** in coastal or brackish water plants. * **Pulp & Paper Industry:** * **Components for liquor preparation and recovery systems** where corrosion resistance to sulfites and alkalis is needed. * **Food & Beverage Processing:** * **Equipment requiring corrosion resistance to cleaning solutions and mild process acids.** --- ## **6. Fabrication & Processing Notes** * **Condition:** Typically supplied **as-cast**. For maximum corrosion resistance and dimensional stability, a **solution anneal** (~1050°C followed by rapid cooling) may be specified, which dissolves any secondary carbides. * **Casting Considerations:** Good castability. The moderate alloy content makes it more forgiving and cost-effective to produce than high-nickel grades like D-3. * **Machinability:** **Good to Very Good.** The austenitic matrix produces stringy chips. Sharp, positive-rake carbide tools with adequate coolant provide good results. It is generally easier to machine than the higher-strength, higher-silicon variants. * **Weldability:** **Fair to Good.** Requires standard procedures for austenitic ductile irons: * Use **matching or nickel-based filler metals** (e.g., ENiCrFe-2 or -3). * **Pre-heat** (100-200°C) is often beneficial. * Control interpass temperature. * **Post-weld stress relief** is recommended for complex castings; **solution annealing** is ideal if corrosion performance in the HAZ is critical. --- ## **7. Ordering Information** **Specify:** **"Austenitic Ductile Iron Castings, ASTM A439 Type D-4 (Ni-Resist D-4 equivalent), [As-Cast or Solution Annealed]."** **Critical Details to Provide:** * **Applicable Standard & Grade** (ASTM A439 D-4). **Clarify if high-silicon Type D-4A is NOT required.** * **Heat Treatment Condition** (if specified). * **Part Drawing & Specification.** * **Service Environment** (e.g., seawater, alkali type/concentration, temperature). * **Certification Requirements:** Standard Mill Test Report (MTR) with chemical analysis and mechanical properties. --- ## **8. Summary: Positioning in the A439 Family** **ASTM A439 Type D-4 occupies a critical middle ground in the austenitic ductile iron spectrum:** * **vs. Type D-2 (18-22% Ni, 1.75-2.5% Cr):** D-4 has a slightly different Cr balance but is largely comparable in performance and cost. It is part of the same general-purpose, moderate-Ni group. * **vs. Type D-3 (28-32% Ni, 2.5-3.5% Cr):** **D-4 offers significant cost savings** (lower Ni) with a slight reduction in corrosion performance, especially in the most severe caustic or oxidizing environments. It is the **go-to grade when D-3 is over-specified**. * **vs. Type D-5 (34-36% Ni, 2.0-3.0% Cr):** D-4 is lower in cost and nickel content, trading off some of the exceptional thermal expansion stability and corrosion resistance of D-5. **Primary Value Proposition:** Type D-4 delivers **approximately 80-90% of the corrosion performance of high-nickel grades (D-3, D-5) in many common environments (seawater, alkalis) at a substantially lower raw material cost.** It is the **workhorse grade** for marine and general industrial corrosion service where austenitic ductile iron is specified. **ASTM A439 Type D-4 is the engineer's choice for cost-effective, reliable corrosion resistance, offering the best practical balance of performance and economics in the austenitic ductile iron family for a vast range of industrial applications.** -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron type D4 Specification Dimensions Size： Diameter 20-1000 mm Length <6556 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 D4 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A439 Austenitic Ductile Iron Flange type D4 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A439 Austenitic Ductile Iron Flange type D4 -:- For detailed product information, please contact sales. -:

Packing of ASTM A439 Austenitic Ductile Iron Flange type D4 -:- 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 3027 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