ASTM A439 Austenitic Ductile Iron Tube,Pipe type D3

ASTM A439 Austenitic Ductile Iron Tube type D3 Product Information -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron Tube type D3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A439 Austenitic Ductile Iron type D3 Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Data Sheet: ASTM A439 Austenitic Ductile Iron – Type D-3** --- ## **1. Product Overview** **ASTM A439 Type D-3 Austenitic Ductile Iron** is a **moderate-nickel, high-copper austenitic spheroidal graphite iron** specifically engineered to provide **superior corrosion resistance in mildly oxidizing to reducing environments, particularly against sulfuric acid and seawater**. Distinguished from other D-series grades by its **significantly higher copper content and lower nickel level**, Type D-3 offers a **unique economic advantage** while maintaining the essential characteristics of an austenitic matrix—good ductility, non-magnetic properties, and thermal stability. It serves as a cost-effective solution for applications where the superior corrosion resistance of high-nickel grades is required but full alloying with nickel is not justified. --- ## **2. Governing Standards & Specifications** This alloy is formally defined within the ASTM A439 specification, representing the most copper-rich standard grade. * **Primary Standard:** * **ASTM A439** - *Standard Specification for Austenitic Ductile Iron Castings* * **International & Commercial Equivalents:** * **ISO 2892:** *Austenitic cast irons* – Type D-3 corresponds to **L-NiCuCr 15 6 3**. * **EN 13835:** *Austenitic cast irons* – Designated as **EN-JS 2033**. * **Common Trade Name:** **Ni-Resist® Type D-3**. * **Key Referenced Testing Standards:** * **ASTM E8:** Tensile Testing * **ASTM E10:** Brinell Hardness * **ASTM A247:** Microstructure Evaluation * **ASTM G48:** Pitting and Crevice Corrosion Resistance Testing * **ASTM G31:** Immersion Corrosion Testing --- ## **3. Chemical Composition Requirements (per ASTM A439)** The high copper and moderate nickel content define Type D-3's corrosion resistance profile and cost structure. | Element | Composition Range (wt.%, ASTM A439) | Functional Role & Metallurgical Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 2.60 - 3.00 | Provides graphite for machinability; controlled to balance matrix properties. | | **Silicon (Si)** | 1.00 - 2.00 | Lower range than D-2 to optimize corrosion resistance in sulfuric acid environments. | | **Nickel (Ni)** | **28.00 - 32.00** | **Primary Austenite Stabilizer.** At this high level, it ensures a fully austenitic matrix with maximum corrosion resistance, particularly in chloride environments, and provides excellent toughness. | | **Chromium (Cr)** | **2.50 - 3.50** | **Essential for Oxidation & Pitting Resistance.** Higher than in D-2 grades, providing improved resistance to oxidizing acids and high-temperature scaling. Forms a robust passive layer. | | **Copper (Cu)** | **0.50 - 1.50** | Present but not a defining feature; typical residual levels. | | **Magnesium (Mg)** | ≥ 0.07 (min., residual) | Ensures spheroidal graphite formation. | | **Phosphorus (P)** | ≤ 0.08 | Kept low. | | **Sulfur (S)** | ≤ 0.03 | Kept low. | **Correction and Clarification:** The table above initially contained an error. The correct, defining feature of **ASTM A439 Type D-3** is its **very high nickel content (28-32%)** combined with **significant chromium (2.5-3.5%)**. It is distinguished from Type D-2 by its higher Ni and Cr, not by high copper. The high nickel makes it one of the most corrosion-resistant grades in the A439 standard, but also one of the most expensive due to raw material cost. Its primary role is resistance to **hot, concentrated caustics and severe oxidizing conditions**. The previously described "moderate-nickel, high-copper" grade is actually more characteristic of **Type D-3A** or other variants like **D-3B**. For accuracy, this datasheet will proceed with the correct properties for the standard **Type D-3** as defined by ASTM A439. --- ## **4. Physical & Mechanical Properties** Type D-3 properties are dominated by its high alloy content, providing stability and corrosion resistance at the expense of some castability and cost. | Property | Typical Value / Range for D-3 | Key Characteristics & Notes | | :--- | :--- | :--- | | **Tensile Strength, min.** | **414 MPa (60,000 psi)** | Good load-bearing capacity. | | **Yield Strength (0.2% offset), min.** | **207 MPa (30,000 psi)** | Moderate yield strength typical of austenitic structures. | | **Elongation, min.** | **15%** | Good ductility, though slightly lower than D-2 due to higher alloy content. | | **Hardness (Brinell, HBW)** | **130 - 190 HBW** | Relatively soft, similar to D-2, ensuring good machinability. | | **Modulus of Elasticity** | **~110 - 120 GPa** | Low modulus, characteristic of high-nickel austenites. | | **Impact Resistance** | **Excellent.** Maintains high toughness. | | **Maximum Service Temperature** | **~870°C (1600°F) Continuous** | Good oxidation resistance due to higher Cr, though not as high as D-2C. | | **Corrosion Resistance** | **Exceptional in Specific Environments:**
• **Superior resistance to hot, concentrated alkalis (caustics).**
• **Excellent resistance to seawater and chloride-induced pitting/crevice corrosion.**
• **Very good resistance to oxidizing acids** (e.g., nitric acid).
• Good resistance to sulfuric acid at various concentrations and temperatures. | | **Non-Magnetic Property** | **Excellent.** Fully austenitic with very low magnetic permeability (µᵣ ~1.0). | | **Coefficient of Thermal Expansion** | **~16 x 10⁻⁶ /°C** | High, similar to other austenitic grades. | | **Thermal Conductivity** | **~11 W/m·K** | Low. | --- ## **5. Product Applications** Type D-3 is specified for severe corrosive service, particularly where alkalis or chlorides are present. * **Chemical Processing:** * **Equipment for caustic soda (NaOH) production, handling, and concentration** (evaporators, pots, pumps, valves). * **Reactors and piping for processes involving strong alkalis.** * **Pulp & Paper Industry:** * **Digester components, liquor handling pumps, and valves** in the kraft process. * **Marine & Offshore:** * **Critical seawater system components** where maximum pitting resistance is required. * **Propeller shaft sleeves, sea chests, and high-grade fittings.** * **Pollution Control:** * **Scrubbers and ducting** in flue gas desulfurization (FGD) systems. * **Food & Pharmaceutical:** * **Equipment for severe cleaning-in-place (CIP) systems** using hot caustics. --- ## **6. Fabrication & Processing Notes** * **Condition:** Typically supplied **as-cast and solution annealed**. A high-temperature anneal (~1050-1150°C) followed by rapid cooling is used to dissolve carbides and ensure a homogeneous, single-phase austenitic structure for optimal corrosion resistance. * **Casting Considerations:** The very high nickel content makes it an expensive alloy with specific melting and pouring requirements. It has good castability but requires careful gating design. * **Machinability:** **Good.** Similar to other austenitic ductile irons. Produces stringy chips; positive rake, sharp carbide tools are recommended. * **Weldability:** **Fair to Good (with proper procedures).** Requires matching high-nickel filler metals (e.g., ENiCrFe-2, -3). Pre-heat is generally not required but interpass temperature control is important. **Post-weld solution annealing is strongly recommended** to restore corrosion resistance in the HAZ. --- ## **7. Ordering Information** **Specify:** **"Austenitic Ductile Iron Castings, ASTM A439 Type D-3 (Ni-Resist D-3 equivalent), Solution Annealed."** **Critical Details to Provide:** * **Applicable Standard & Grade** (ASTM A439 D-3). * **Heat Treatment Requirement** (Solution Annealed condition is typical for corrosion service). * **Part Drawing & Specification.** * **Corrosive Service Environment** (specific chemicals, concentrations, temperatures). * **Certification Requirements:** MTR with full chemical analysis (ensuring Ni and Cr are within spec), mechanical properties, and heat treatment records. Corrosion test reports may be requested for critical applications. --- ## **8. Summary & Selection Notes** **ASTM A439 Type D-3 is the premium corrosion-resistant grade within the standard austenitic ductile irons, distinguished by its high nickel and chromium content.** * **Primary Advantage:** Unmatched resistance to **hot concentrated alkalis** and excellent all-around corrosion resistance in severe environments, including seawater and oxidizing acids. * **Primary Limitation:** **High cost** due to significant nickel content. * **When to Select D-3 over D-2:** When the service environment involves **hot, concentrated caustics** or when **maximum general corrosion and pitting resistance** in chloride environments is required and justifies the higher material cost. * **When to Consider Alternatives:** For sulfuric acid service, **Type D-3A** (higher Si, Cu) may be more economical. For extreme high-temperature oxidation, **Type D-2C** or **Type D-5** may be more suitable. **ASTM A439 Type D-3 represents the high-performance end of the standard austenitic ductile iron spectrum, providing reliable service in some of the most chemically aggressive industrial environments.** -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron type D3 Specification Dimensions Size： Diameter 20-1000 mm Length <6554 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 D3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A439 Austenitic Ductile Iron Tube type D3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A439 Austenitic Ductile Iron Tube type D3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A439 Austenitic Ductile Iron Tube type D3 -:- 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 Tube 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 3025 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