Spherical Ductile Iron grade 60-40-18, low temperature service

Ductile Iron grade 60-40-18, low temperature service Product Information -:- For detailed product information, please contact sales. -: Ductile Iron grade 60-40-18, low temperature service Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical Ductile Iron grade 60-40-18, low temperature service characteristics -:- For detailed product information, please contact sales. -: Spherical Ductile Iron grade 60-40-18, low temperature service Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical Ductile Iron grade 60-40-18, low temperature service Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical Ductile Iron grade 60-40-18, low temperature service Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Ductile Iron grade 60-40-18, low temperature service Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: Ductile Iron (Nodular Iron) Grade 60-40-18, Low-Temperature Service (LTS) Grade** --- #### **1. Product Overview** Ductile Iron Grade 60-40-18 for Low-Temperature Service (LTS) is a specially engineered ferritic grade designed to maintain excellent ductility and, most critically, high-impact toughness at sub-zero temperatures. While standard 60-40-18 offers good room-temperature properties, the LTS variant undergoes stringent control of chemistry and heat treatment to **suppress the ductile-to-brittle transition temperature (DBTT)**, ensuring reliable performance in environments as cold as **-40°C (-40°F) or below**. It is the material of choice for critical infrastructure and components exposed to arctic climates, cryogenic service, or seasonal freezing, where sudden brittle fracture must be absolutely prevented. #### **2. Governing International Standards** This specialized grade is defined by enhanced requirements within established standards. * **Primary Designation: ASTM A536** - *Standard Specification for Ductile Iron Castings*. The base grade is **60-40-18**, with supplemental low-temperature impact testing requirements (e.g., SAE J434 G40018F). * **Key Specialized Standards:** * **ASTM A874/A874M** - *Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature Service*. This is the most direct specification, often covering grades like 60-40-18 and 65-45-12 with guaranteed impact properties at -40°F/C. * **ISO 1083/EN 1563:** Designated with supplementary codes. For example, **EN-GJS-400-18-LT** signifies a low-temperature grade. Specific impact energy values at defined temperatures (e.g., -20°C, -40°C, -50°C) are contractually specified. * **EN 10293** - *Steel castings for general engineering uses* may also reference low-temperature ductile iron. * **Key Testing Standards:** * **Tensile Test:** ASTM E8 / ISO 6892-1. * **Impact Test (Critical):** ASTM E23 (Charpy V-Notch) at specified low temperature (e.g., -40°C/-40°F). ISO 148-1. * **Microstructure:** ASTM A247 / ISO 945. #### **3. Critical Chemical Composition (Ferritic Annealed)** The chemistry is optimized for low-temperature toughness, with strict limits on elements that raise the DBTT. | Element | Target Range (%) | Rationale for Low-Temperature Service | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.8 | Standard for castability and graphitization. | | **Silicon (Si)** | **1.8 - 2.3 (Max)** | **Crucially lowered.** High Si embrittles the ferrite matrix at low temperatures. This is the single most important compositional control for LTS grades. | | **Manganese (Mn)** | **≤ 0.20 (Max)** | **Stringently limited.** Mn segregates to cell boundaries, promoting brittle carbides/phosphides that drastically reduce low-T impact strength. | | **Phosphorus (P)** | **≤ 0.03 (Max)** | **Extremely low.** Phosphorus severely embrittles grain boundaries; its control is non-negotiable for LTS. | | **Magnesium (Mg)** | 0.03 - 0.05 | Standard for nodulization. | | **Nickel (Ni)** | 0.5 - 2.0 | **Often added.** An austenite stabilizer that significantly improves low-temperature toughness without harming machinability. Common in grades for -50°C and below. | | **Copper (Cu)** | ≤ 0.10 | Minimized as it offers less toughening benefit than Ni and can promote pearlite. | | **Trace Elements (Sn, Sb, As, etc.)** | **Tightly restricted** | Elements that promote pearlite or segregate to boundaries are minimized via use of high-purity charge materials. | #### **4. Physical & Mechanical Properties (Low-Temperature Focus)** Properties meet or exceed standard 60-40-18, with guaranteed impact toughness. | Property | Minimum / Typical Value (at Room Temp) | **Low-Temperature Specific Requirement** | | :--- | :--- | :--- | | **Tensile Strength, min.** | 415 MPa (60 ksi) | Maintained. | | **Yield Strength, min.** | 275 MPa (40 ksi) | Maintained or slightly elevated. | | **Elongation, min.** | 18% | Maintained, indicative of a fully ferritic matrix. | | **Hardness (Brinell)** | 143 - 187 HBW | Typical. | | **Modulus of Elasticity** | 165 - 172 GPa | Maintained. | | **Charpy V-Notch Impact Energy (Key Property)** | ~18-25 J @ 23°C | **Typically specified as a minimum at low T:**
• **≥ 12-15 J @ -40°C (-40°F)** is a common specification.
• For more severe service (e.g., -50°C): **≥ 7-10 J** with Ni alloying. | | **Ductile-to-Brittle Transition Temperature** | **Typically < -60°C** for optimized grades. | A qualitative measure of the material's inherent low-T capability. | | **Microstructure** | **>95% Ferrite**, **High Nodularity (>90%),** **Small Nodule Count**.
**Free of massive carbides & excessive pearlite.** | Fine, fully ferritic matrix is essential for consistent low-T performance. | #### **5. Product Applications** This grade is specified where failure due to low-temperature embrittlement is not an option. * **Energy & Pipeline:** **Valve bodies, pump casings, and fittings for LNG (Liquefied Natural Gas) facilities, cryogenic pipelines, and arctic oil & gas installations.** Direct exposure to cryogenic fluids. * **Infrastructure:** **Ductile Iron Pipe (DIP) for water mains in permafrost regions** (e.g., Alaska, Northern Canada, Siberia). Must withstand ground heave and pressure surges in freezing conditions. * **Transportation:** **Critical components for railway and heavy vehicles operating in polar climates,** such as brake system parts, couplers, and suspension components. * **Marine & Offshore:** **Equipment for ice-going vessels, offshore platforms in cold seas.** * **Industrial:** **Compressor housings, process equipment for chemical plants** handling cooled gases. #### **6. Special Manufacturing & Quality Notes** * **Heat Treatment:** A **full ferritizing anneal** is mandatory to eliminate all pearlite and carbides, which are detrimental to low-T toughness. * **Charge Material Purity:** Requires high-purity pig iron and steel scrap to control residual trace elements. * **Quality Assurance:** Beyond standard tests, **impact testing at the specified service temperature** is required for certification. Lot testing is standard. * **Weldability:** Similar to standard ferritic DI but requires even greater care. Use of matching or high-nickel electrodes with strict thermal controls is essential to preserve the heat-affected zone (HAZ) toughness. #### **7. Ordering Information** Specify: **"Ductile Iron, ASTM A874 Grade 60-40-18, for Low-Temperature Service"**. **Mandatory details to include:** * **Minimum Service Temperature:** (e.g., -40°C / -40°F). * **Minimum Charpy V-Notch Impact Energy Requirement** at that temperature. * **Applicable Standard & Grade** (e.g., EN-GJS-400-18-LT, with impact at -50°C ≥ 12 J). * **Certification Requirement:** Mill Test Report must include tensile properties, chemical analysis (showing low Si, Mn, P), **and full Charpy impact test results at the specified low temperature.** This LTS grade represents the pinnacle of reliability for ductile iron in harsh environments, where its performance is the result of meticulous metallurgical control from charge make-up to final heat treatment. -:- For detailed product information, please contact sales. -: Ductile Iron grade 60-40-18, low temperature service Specification Dimensions Size： Diameter 20-1000 mm Length <6519 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. -: Ductile Iron grade 60-40-18, low temperature service Properties -:- For detailed product information, please contact sales. -:

Spherical Ductile Iron grade 60-40-18, low temperature service Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical Ductile Iron grade 60-40-18, low temperature service -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of Ductile Iron grade 60-40-18, low temperature service -:- For detailed product information, please contact sales. -: Chemical Identifiers Ductile Iron grade 60-40-18, low temperature service -:- For detailed product information, please contact sales. -:

Packing of Ductile Iron grade 60-40-18, low temperature service -:- 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 Spherical Powder 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 2990 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