ASTM A439 Austenitic Ductile Iron Wire type D4

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

Packing of ASTM A439 Austenitic Ductile Iron Wire 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 Wire 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