ASTM A439 Austenitic Ductile Iron Sheet,Plate type D5

ASTM A439 Austenitic Ductile Iron Sheet/Plate type D5 Product Information -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron Sheet/Plate type D5 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A439 Austenitic Ductile Iron type D5 Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Data Sheet: ASTM A439 Austenitic Ductile Iron – Type D-5** --- ## **1. Product Overview** **ASTM A439 Type D-5 Austenitic Ductile Iron** represents the **pinnacle of dimensional stability and corrosion resistance** within the standard austenitic ductile iron family. Distinguished by its **exceptionally high nickel content (34-36%)**, this alloy is engineered to deliver **minimal thermal expansion, outstanding resistance to thermal shock, and superior performance in severe corrosive environments**, particularly hot concentrated alkalis and seawater. Type D-5 offers the **lowest coefficient of thermal expansion of any standard austenitic ductile iron**, making it indispensable for applications requiring precise dimensional control under wide temperature fluctuations or in assemblies with dissimilar metals. --- ## **2. Governing Standards & Specifications** Type D-5 is the premium-grade austenitic ductile iron defined by ASTM, renowned for its unique thermal properties. * **Primary Standard:** * **ASTM A439** - *Standard Specification for Austenitic Ductile Iron Castings* * **International & Commercial Equivalents:** * **ISO 2892:** *Austenitic cast irons* – Type D-5 corresponds to **L-NiCr 35 3**. * **EN 13835:** *Austenitic cast irons* – Designated as **EN-JS 2038**. * **Common Trade Name:** **Ni-Resist® Type D-5** (often referred to as the low-expansion grade). * **Key Referenced Testing Standards:** * **ASTM E8/E21:** Tensile Testing (Room & Elevated Temperature) * **ASTM E228:** Standard Test Method for Linear Thermal Expansion of Solid Materials * **ASTM E10:** Brinell Hardness * **ASTM A247:** Microstructure Evaluation --- ## **3. Chemical Composition Requirements (per ASTM A439)** The ultra-high nickel content is the defining feature that dictates Type D-5's unique physical properties. | Element | Composition Range (wt.%, ASTM A439) | Functional Role & Metallurgical Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 2.30 - 2.80 | Controlled at the lower end of the ductile iron range. The high nickel content is a powerful graphitizer; lower carbon helps maintain a sound matrix and control mechanical properties. | | **Silicon (Si)** | 1.00 - 2.00 | Lower range than many other grades. High Si can interfere with the low thermal expansion characteristic; it is controlled to optimize corrosion resistance without compromising dimensional stability. | | **Nickel (Ni)** | **34.00 - 36.00** | **The Defining Element.** This ultra-high level is responsible for the alloy's **exceptionally low coefficient of thermal expansion** (similar to low-carbon steels). It ensures a perfectly stable, fully austenitic matrix with maximum ductility, toughness, and corrosion resistance, especially in chloride and caustic environments. | | **Chromium (Cr)** | **2.00 - 3.00** | Provides essential oxidation resistance and strengthens the matrix. The level is balanced to complement the nickel without negatively impacting the thermal expansion characteristics. | | **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. | --- ## **4. Physical & Mechanical Properties** Type D-5's properties are dominated by its high nickel content, offering a unique combination of dimensional stability and corrosion resistance. | Property | Typical Value / Range for D-5 | Key Characteristics & Significance | | :--- | :--- | :--- | | **Tensile Strength, min.** | **414 MPa (60,000 psi)** | Good load-bearing capacity; typical values can be higher. | | **Yield Strength (0.2% offset), min.** | **207 MPa (30,000 psi)** | Moderate yield strength, typical of soft austenitic structures. | | **Elongation, min.** | **15%** | Excellent ductility, essential for accommodating stress in rigid assemblies. | | **Hardness (Brinell, HBW)** | **120 - 180 HBW** | **The softest of the austenitic grades**, contributing to exceptional machinability and galling resistance. | | **Modulus of Elasticity** | **~110 - 120 GPa** | Low modulus, reducing thermal stress. | | **Coefficient of Thermal Expansion (20-400°C)** | **~9.0 - 10.5 x 10⁻⁶ /°C** | **The Critical Property.** This is **approximately half that of other austenitic ductile irons (e.g., D-2, D-3) and similar to carbon steel.** This enables its use in assemblies with steel components without excessive thermal stress, and provides superior resistance to thermal shock. | | **Thermal Conductivity** | **~10.5 - 12.5 W/m·K** | Very low, but the low CTE often outweighs this for thermal shock resistance. | | **Impact Resistance** | **Excellent.** Maintains high toughness from cryogenic to elevated temperatures. | | **Corrosion Resistance** | **Outstanding:**
• **Exceptional resistance to hot, concentrated alkalis (caustics).**
• **Superior resistance to seawater, brine, and chloride-induced stress corrosion cracking.**
• Very good resistance to dilute sulfuric, phosphoric, and organic acids.
• **Not recommended for strong oxidizing acids** like nitric acid at high concentrations. | | **Maximum Service Temperature** | **~800°C (1470°F) Continuous** | Good oxidation resistance, though its primary use is often at lower temperatures where dimensional stability is key. | | **Non-Magnetic Property** | **Excellent.** Fully austenitic with very low permeability. | | **Machinability** | **Excellent.** Its softness and uniform austenitic structure allow for high metal removal rates, good surface finish, and low tool wear. | --- ## **5. Product Applications** Type D-5 is specified where dimensional stability in corrosive or variable temperature environments is paramount. * **Precision Machinery & Tooling:** * **Machine tool bases, fixtures, and gauge blocks** requiring dimensional stability in varying shop temperatures. * **Glass molding dies and equipment** where thermal cycling occurs. * **Marine & Offshore (Critical Assemblies):** * **Cylinder liners, valve seats, and pump housings** assembled into steel engine blocks or structures, minimizing thermal stress. * **Critical seawater system components** where both corrosion resistance and fit with steel piping are required. * **Chemical Processing:** * **Heat exchanger tubesheets, tube supports, and baffles** where tubes are of a different material (e.g., steel, titanium). * **Equipment for caustic service** where dimensional integrity is critical. * **Automotive & Aerospace:** * **Select components in turbocharger assemblies** or exhaust systems where thermal cycling is severe. * **Energy Generation:** * **Components in advanced engine designs** where aluminum or steel housings are combined with corrosion-resistant internals. --- ## **6. Fabrication & Processing Notes** * **Condition:** Typically supplied **as-cast and solution annealed**. A full solution anneal (~1100-1150°C) followed by rapid cooling is standard to ensure a homogeneous, carbide-free austenitic structure for optimal corrosion resistance, ductility, and consistent thermal properties. * **Casting Considerations:** The very high nickel content makes it an expensive alloy with specific melting characteristics. It has good castability but requires careful control to achieve the correct microstructure. **Thermal expansion testing** of cast samples is often performed to verify the characteristic low CTE. * **Machinability:** **Excellent.** Considered one of the most machinable corrosion-resistant cast alloys. Sharp high-speed steel or carbide tools can be used effectively. The soft matrix produces long, ductile chips. * **Weldability:** **Good (for an austenitic cast iron).** Its high nickel and homogeneous structure make it less prone to hot cracking than lower-nickel grades. * Use **matching high-nickel filler metals** (e.g., ENiCrFe-2 or -3). * Pre-heat is often minimal (~100°C) but interpass temperature control is important. * **Post-weld solution annealing is highly recommended** to restore optimal corrosion resistance and dimensional stability in the HAZ. --- ## **7. Ordering Information** **Specify:** **"Austenitic Ductile Iron Castings, ASTM A439 Type D-5 (Ni-Resist D-5 / Low-Expansion Grade), Solution Annealed."** **Critical Details to Provide:** * **Applicable Standard & Grade** (ASTM A439 D-5). Explicitly note "low-expansion" if critical. * **Mandatory Heat Treatment:** "Solution Annealed" is standard for performance. * **Part Drawing & Specification**, highlighting any critical dimensional tolerances or fit with other materials. * **Service Environment** and **Temperature Range** of operation. * **Certification Requirements:** MTR with full chemical analysis (Ni content must be verified), mechanical properties, and heat treatment records. For applications where CTE is critical, **certification of thermal expansion coefficient** per ASTM E228 may be specified. --- ## **8. Summary: The Premium Low-Expansion Alloy** **ASTM A439 Type D-5 is a specialty engineering material where its unique low thermal expansion coefficient provides an irreplaceable solution. Its value proposition is clear:** * **Primary Advantage:** **Unmatched dimensional stability (low CTE) combined with premium corrosion resistance.** It bridges the gap between the corrosion resistance of high-nickel alloys and the dimensional behavior of carbon steel. * **Primary Limitation:** **Highest material cost** within the A439 family due to its very high nickel content. * **When to Select D-5:** When the application involves **1) severe thermal cycling, 2) assembly with dissimilar metals (especially steel), or 3) the most demanding caustic/seawater corrosion**, and the cost can be justified by performance, reliability, or assembly savings. * **When to Consider Alternatives:** For general corrosion resistance without the critical need for low expansion, **Type D-3** or **Type D-4** offer significant cost savings. **ASTM A439 Type D-5 is not just another corrosion-resistant alloy; it is a precision engineering material that solves complex problems of thermal stress and corrosion in advanced mechanical and chemical systems.** -:- For detailed product information, please contact sales. -: ASTM A439 Austenitic Ductile Iron type D5 Specification Dimensions Size： Diameter 20-1000 mm Length <6557 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 D5 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A439 Austenitic Ductile Iron Sheet,Plate type D5 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A439 Austenitic Ductile Iron Sheet,Plate type D5 -:- For detailed product information, please contact sales. -:

Packing of ASTM A439 Austenitic Ductile Iron Sheet/Plate type D5 -:- 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 Sheet/Plate 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 3028 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