Iron Rod/Bar torsion grade 80-55-06

Ductile Iron Rod torsion grade 80-55-06 Product Information -:- For detailed product information, please contact sales. -: Ductile Iron Rod torsion grade 80-55-06 Synonyms -:- For detailed product information, please contact sales. -:

Ductile Iron torsion grade 80-55-06 Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: Ductile Iron – Grade 80-55-06 (Pearlitic) for High-Strength Torsion Applications** --- #### **1. Product Overview** **Ductile Iron Grade 80-55-06** is a **high-strength, pearlitic grade** engineered for demanding **torsional (twisting) applications** requiring exceptional shear strength, fatigue resistance, and stiffness. Its refined, normalized microstructure delivers a robust balance of **high torsional yield strength, excellent resistance to fatigue under cyclic torque, and good wear characteristics** in bearing and spline areas. This grade is the material of choice when operating stresses approach the limits of lower-strength ductile irons, making it suitable for critical power transmission components in heavy-duty automotive, industrial, and off-highway equipment where reliability under high torque is non-negotiable. --- #### **2. Governing International Standards** This high-performance grade is specified by its tensile properties, with torsional performance being a critical derived attribute. * **Primary Standard (Tensile Definition): ASTM A536** - *Standard Specification for Ductile Iron Castings*. Formally designated as **Grade 80-55-06**. * **Global Tensile Equivalents:** These standards define the base material: * **ISO 1083 / EN 1563:** **EN-GJS-600-5**. * **SAE J434c:** **Grade D5506**. * **UNS F34100**. * **Key Referenced Testing Standards:** * **Torsional Testing:** Guided by ASTM A938 / ISO 7800 principles. * **Tensile & Hardness (for certification):** ASTM E8, E10. * **Fatigue Testing:** Torsional fatigue validation is often required for critical components (e.g., per SAE J1099 or custom protocols). --- #### **3. Typical Chemical Composition (Normalized Condition)** Chemistry is alloyed to produce a consistent, high-strength pearlitic matrix capable of withstanding high shear stresses. | Element | Target Range (%) | Functional Role for High-Strength Torsion | | :--- | :--- | :--- | | **Carbon (C)** | 3.4 - 3.7 | Strengthens the metallic matrix; controlled to optimize hardenability and strength. | | **Silicon (Si)** | 2.0 - 2.4 | Promotes pearlite formation; controlled to limit ferrite, maximizing shear strength. | | **Manganese (Mn)** | **0.30 - 0.60** | Essential pearlite stabilizer; ensures high through-thickness strength under torsion. | | **Magnesium (Mg)** | 0.03 - 0.05 | Ensures high nodularity for optimal stress distribution under shear. | | **Copper (Cu)** | **0.40 - 0.80** | **Critical alloy.** Promotes a fine, uniform pearlite structure, directly enhancing torsional yield and fatigue strength. | | **Molybdenum (Mo)** | **0 - 0.25** | Added for heavy-section components to prevent core ferrite and ensure consistent high strength. | | **Phosphorus (P)** | **≤ 0.04** | Kept low. | | **Sulfur (S)** | **≤ 0.015** | Kept very low. | --- #### **4. Physical & Mechanical Properties (Torsion Focus)** This grade offers superior performance for high-torque applications. | Property | Value / Relationship | Significance for Torsional Applications | | :--- | :--- | :--- | | **Shear Modulus (Modulus of Rigidity, G)** | **~64 - 67 GPa (9.3 - 9.7 x 10⁶ psi)** | High stiffness minimizes angular deflection under torque, critical for precision drives. | | **Torsional Yield Strength (approx.)** | **~265 - 300 MPa (38 - 43 ksi)** | Estimated as **0.7 - 0.8 x Tensile Yield Strength (380 MPa)**. Provides a high margin against permanent twisting deformation. | | **Ultimate Torsional Strength (approx.)** | **~440 - 495 MPa (64 - 72 ksi)** | Estimated as **0.8 - 0.9 x Tensile Strength (550 MPa)**. | | **Tensile Properties (Certification Basis)** | **550 MPa UTS, 380 MPa YS, 6% Elongation** | The 6% elongation provides essential ductility to withstand shock loads without brittle fracture. | | **Fatigue Limit (Torsional)** | **~200 - 240 MPa** | **Excellent.** The fine pearlitic microstructure provides superior resistance to crack initiation and propagation under cyclic torsional loading. | | **Hardness (Brinell)** | **207 - 255 HBW** | High hardness provides excellent resistance to fretting, wear, and brinelling in keyways, splines, and bearing areas. | | **Damping Capacity** | **Moderate to Good** | Provides useful vibration damping, though less than more ferritic grades. | --- #### **5. Product Applications (High-Strength Torsion)** Grade 80-55-06 is specified for heavily loaded, safety-critical torsional components. * **Heavy-Duty Powertrain:** **Truck and agricultural tractor transmission shafts, PTO shafts for high-horsepower equipment, differential pinion shafts, and pump drives for hydraulic systems.** * **Industrial Machinery:** **Main drive shafts for extruders, mixers, and large conveyors; rolls in steel processing lines; and heavy-duty coupling hubs.** * **Off-Highway & Construction:** **Final drive shafts for excavators and loaders, swing drive shafts, and pump shafts in heavy equipment.** * **Energy Sector:** **Intermediate shafts in wind turbine gearboxes, pump shafts in oil & gas applications, and drives for large industrial fans.** * **Marine:** **Intermediate propeller shafts and pump drives for commercial vessels.** --- #### **6. Fabrication & Design Notes** * **Condition:** **Must be Normalized.** This heat treatment is essential to develop the uniform pearlitic microstructure that delivers the specified high torsional properties. "As-cast" material is not suitable. * **Design Philosophy:** The **high torsional yield strength** allows for more compact shaft designs or higher power transmission. Meticulous attention to **stress concentration factors** is critical: use generous fillet radii, smooth transitions, and consider surface treatments. **Finite Element Analysis (FEA)** is strongly recommended for complex geometries and load cases. * **Machinability:** **Fair to Good.** Requires robust, carbide tooling and appropriate speeds/feeds. Machining of precision features like splines and bearing journals is standard post-normalizing. * **Surface Enhancement:** **Induction hardening** is highly effective for dramatically increasing surface hardness (55-60 HRC) on bearing journals, splines, and seal areas, significantly improving wear and fatigue resistance while maintaining a tough core. --- #### **7. Ordering Information** **Specify:** **"Ductile Iron Castings, ASTM A536 Grade 80-55-06, Normalized Condition, for High-Strength Torsional Application."** **Essential Details to Provide:** * **Applicable Standard** (ASTM A536). * **Part Drawing & Specification,** with explicit torque ratings (steady, peak, cyclic), safety factors, and fatigue life requirements. * **Mandatory Heat Treatment:** "Normalized" must be stated. * **Certification Requirements:** Mill Test Report (MTR) with tensile properties, hardness, and often microstructure verification (minimum pearlite content). * **Special Requirements:** For critical shafts, specify **Non-Destructive Testing (NDT)** such as 100% Magnetic Particle Inspection (MPI) and Ultrasonic Testing (UT) for internal soundness. **Component-level torsion testing or fatigue validation** is common for qualifying new designs. **Grade 80-55-06 provides a premium, high-reliability solution for torsional components operating at the upper limits of ductile iron performance. It successfully replaces many forged steel shafts, offering the benefits of casting complexity, inherent damping, and cost savings without compromising strength or durability.** -:- For detailed product information, please contact sales. -: Ductile Iron torsion grade 80-55-06 Specification Dimensions Size： Diameter 20-1000 mm Length <6541 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 80-55-06 Properties -:- For detailed product information, please contact sales. -:

Applications of Ductile Iron Rod torsion grade 80-55-06 -:- For detailed product information, please contact sales. -: Chemical Identifiers Ductile Iron Rod torsion grade 80-55-06 -:- For detailed product information, please contact sales. -:

Packing of Ductile Iron Rod torsion grade 80-55-06 -:- 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 Rod 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 3012 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