Iron Sheet,Plate torsion grade 60-40-18

Ductile Iron Sheet/Plate torsion grade 60-40-18 Product Information -:- For detailed product information, please contact sales. -: Ductile Iron Sheet/Plate torsion grade 60-40-18 Synonyms -:- For detailed product information, please contact sales. -:

Ductile Iron torsion grade 60-40-18 Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: Ductile Iron – Grade 60-40-18 (Ferritic) for Torsion-Dominant Applications** --- #### **1. Product Overview** **Ductile Iron Grade 60-40-18** is a **high-ductility, ferritic grade** whose mechanical properties make it exceptionally well-suited for components subjected to **torsional (twisting) loads**. Defined by its tensile rating, this material exhibits a favorable combination of **moderate shear strength, high torsional ductility, and excellent fatigue resistance under cyclic twisting stresses**. Its fully annealed, ferritic microstructure provides reliable performance in applications where shock torque, vibration damping, and resistance to brittle fracture under torsion are critical. It is often specified for shafts, linkages, and drive components where its castability for complex shapes offers advantages over wrought materials. --- #### **2. Governing International Standards** The material is universally specified by tensile standards, with its torsional behavior derived from these fundamental properties. * **Primary Standard (Tensile Definition): ASTM A536** - *Standard Specification for Ductile Iron Castings*. Formally designated as **Grade 60-40-18**. * **Global Tensile Equivalents:** These define the material and thus its torsional characteristics: * **ISO 1083 / EN 1563:** **EN-GJS-400-18**. * **SAE J434c:** **Grade D4018**. * **UNS F32800**. * **Key Referenced Testing Standards:** * **Torsional Testing:** ASTM A938 (Standard Test Method for Torsion Testing of Wire) provides methodology principles, though component testing is more common. * **Tensile & Hardness (for certification):** ASTM E8, E10. * **Fatigue Testing:** Torsional fatigue life is often validated per component-specific protocols. --- #### **3. Typical Chemical Composition (Annealed Condition)** Chemistry is optimized for a uniform, ductile ferritic matrix to withstand shear stresses. | Element | Target Range (%) | Functional Role for Torsional Performance | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.9 | High carbon provides graphite, which helps blunt propagating cracks under shear stress. | | **Silicon (Si)** | 2.3 - 2.8 | Promotes the soft, ductile ferritic matrix that allows for plastic yielding in shear without sudden fracture. | | **Manganese (Mn)** | **≤ 0.30** | Kept low to prevent the formation of hard, brittle micro-constituents that could act as initiation sites for torsional fatigue cracks. | | **Phosphorus (P)** | **≤ 0.04** | Very low to prevent grain boundary embrittlement, which is detrimental under combined torsional and tensile stresses. | | **Sulfur (S)** | **≤ 0.015** | Very low. | | **Magnesium (Mg)** | 0.03 - 0.05 | Ensures high nodularity; spherical graphite minimizes stress concentration compared to flake graphite. | --- #### **4. Physical & Mechanical Properties (Torsion Focus)** Torsional properties are derived from tensile data using established mechanical relationships. | Property | Value / Relationship | Significance for Torsional Applications | | :--- | :--- | :--- | | **Shear Modulus (Modulus of Rigidity, G)** | **~64 - 67 GPa (9.3 - 9.7 x 10⁶ psi)** | Calculated from Elastic Modulus (E) and Poisson's ratio. Determines angular deflection under torque. | | **Torsional Yield Strength (approx.)** | **~165 - 195 MPa (24 - 28 ksi)** | Estimated as **0.5 - 0.6 x Tensile Yield Strength (276 MPa)**. The shear yield point under pure torsion. | | **Ultimate Torsional Strength (approx.)** | **~330 - 360 MPa (48 - 52 ksi)** | Estimated as **0.8 - 0.9 x Tensile Strength (414 MPa)**. | | **Tensile Properties (Certification Basis)** | **414 MPa UTS, 276 MPa YS, 18% Elongation** | High elongation is crucial, as it correlates to high torsional ductility and large angles of twist before failure. | | **Fatigue Limit (Torsional)** | **~120 - 150 MPa** | Good resistance to failure under high-cycle reversed torsional loading. Surface finish and fillet radii are critical design factors. | | **Hardness (Brinell)** | **143 - 187 HBW** | Lower hardness is beneficial for machining stress-concentrating features like keyways and splines. | | **Damping Capacity** | **High** | Effectively dampens torsional vibrations, protecting downstream components from oscillatory loads. | --- #### **5. Product Applications (Torsion-Dominant)** This grade is ideal for components that transmit or resist torque in non-aggressive environments. * **Drive Shafts & Tubing:** **Intermediate shafts, PTO (Power Take-Off) shafts, and non-critical propeller shafts** for agricultural and light industrial equipment where shock loads are possible. * **Linkages & Levers:** **Steering linkage arms, throttle linkages, and actuating levers** subject to twisting motions. * **Pump & Compressor Drives:** **Shafts for low-to-moderate pressure centrifugal pumps and compressors.** * **Textile & Packaging Machinery:** **Various roller shafts and driven mandrels** where smooth operation and vibration damping are valued. * **General Power Transmission:** **Gear blanks prior to hardening, coupling hubs, and splined sleeves** where the component will be machined and sometimes later heat-treated. --- #### **6. Fabrication & Design Notes** * **Condition:** **Annealed (Ferritized).** This ensures maximum ductility and consistent properties, which are vital for predictable torsional behavior. * **Design Philosophy:** Critical to **minimize stress concentrators**. Use generous fillet radii at shoulder changes, avoid sharp corners on keyways, and consider roll-finishing or shot-peening for improved fatigue life. The **high torsional ductility** provides a "fail-safe" warning via noticeable deformation before fracture. * **Machinability:** **Excellent.** Easy to machine complex profiles, splines, and keyways, which is a major advantage over steel forgings for prototype or mid-volume production. * **Surface Enhancement:** While not through-hardened, **induction hardening or nitriding** can be applied to bearing surfaces or specific sections of the shaft to dramatically increase surface hardness and wear resistance without compromising the core's toughness. --- #### **7. Ordering Information** **Specify:** **"Ductile Iron Castings, ASTM A536 Grade 60-40-18, Annealed, for Torsional Application."** **Essential Details to Provide:** * **Applicable Standard** (ASTM A536). * **Part Drawing & Specification,** highlighting torque requirements, fatigue life expectations, and critical features (fillet radii, surface finish callouts for bearing areas). * **Certification Requirements:** Standard Mill Test Report (MTR) with tensile properties and hardness. * **Special Requirements:** If the application is highly stressed, **component-level torsion testing or fatigue validation** may be specified. **Magnetic Particle Inspection (MPI)** is recommended for surface quality verification on finished machined parts. **Grade 60-40-18 provides a reliable and cost-effective solution for torsionally loaded components, particularly where shock absorption, design flexibility, and a safety margin through ductility are more critical than absolute maximum strength.** -:- For detailed product information, please contact sales. -: Ductile Iron torsion grade 60-40-18 Specification Dimensions Size： Diameter 20-1000 mm Length <6539 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 torsion grade 60-40-18 Properties -:- For detailed product information, please contact sales. -:

Applications of Ductile Iron Sheet,Plate torsion grade 60-40-18 -:- For detailed product information, please contact sales. -: Chemical Identifiers Ductile Iron Sheet,Plate torsion grade 60-40-18 -:- For detailed product information, please contact sales. -:

Packing of Ductile Iron Sheet/Plate torsion grade 60-40-18 -:- 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 3010 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