Iron Tube,Pipe torsion grade 120-90-02,Iron Tube,Pipe torsion grade 120-90-02

Ductile Iron Tube torsion grade 120-90-02 Product Information -:- For detailed product information, please contact sales. -: Ductile Iron Tube torsion grade 120-90-02 Synonyms -:- For detailed product information, please contact sales. -:

Ductile Iron torsion grade 120-90-02 Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: Ductile Iron – Grade 120-90-02 (Ultra-High-Strength) for Extreme Torsion Applications** --- #### **1. Product Overview** **Ductile Iron Grade 120-90-02** represents the **ultimate tier of torsional performance** achievable with ductile iron technology, engineered for applications demanding **maximum shear strength, exceptional fatigue resistance under cyclic torque, and superior resistance to torsional deformation**. To achieve these properties, the material **must undergo specialized heat treatment**—typically **Austempering (ADI) or Quenching & Tempering (QT)**—resulting in an ausferritic or tempered martensitic microstructure. This grade delivers torsional performance that rivals or exceeds many alloy steels, making it suitable for the most critical, highly stressed power transmission components where failure is not an option and weight savings are paramount. --- #### **2. Governing International Standards & Specifications** This grade's exceptional torsional capability is a direct result of specific heat treatment processes. * **Primary Reference (Tensile Basis): ASTM A536** - Includes **Grade 120-90-02** as a performance target for heat-treated material. * **Governing Heat Treatment Standards (Critical for Properties):** * **ASTM A897 / A897M** - *Austempered Ductile Iron (ADI) Castings*. Grades such as **900/650/08, 1050/700/05, or 1200/850/04** provide the microstructure for extreme torsional performance. * **ISO 17804:** *Austempered spheroidal graphite cast irons*. Grades like **JS/1000/5/400/12** are relevant. * **Proprietary QT Specifications:** For Quenched & Tempered ductile iron achieving this performance level. * **Key Referenced Testing Standards:** * **Torsional Testing:** ASTM A938 / ISO 7800. * **Tensile & Hardness (for certification):** ASTM E8, E10/E18. * **Fatigue Testing:** Torsional fatigue validation per SAE J1099 or custom specifications is mandatory for critical parts. --- #### **3. Typical Chemical Composition (Base Iron for ADI/QT)** Chemistry is meticulously designed for extreme hardenability and microstructural control under heat treatment. | Element | Target Range (%) | Functional Role for Extreme Torsion Performance | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.7 | Provides carbon for matrix strengthening and stable graphite formation. | | **Silicon (Si)** | **2.4 - 2.8** | **Crucial.** In ADI, enables formation of high-carbon stabilized austenite within ausferrite, enhancing fracture toughness under shear. | | **Manganese (Mn)** | **0.20 - 0.40** | Controlled to ensure hardenability while minimizing segregation that could create brittle paths under high shear stress. | | **Magnesium (Mg)** | 0.03 - 0.05 | Ensures very high nodularity (>90%) for optimal shear stress distribution. | | **Copper (Cu)** | **0.8 - 1.2** | Strong hardenability agent; ensures uniform high strength to the core under torsional load. | | **Molybdenum (Mo)** | **0.3 - 0.6** | **Essential.** Provides deep hardenability to achieve fully martensitic or ausferritic matrix in thick sections, preventing soft core zones. | | **Nickel (Ni)** | 0.5 - 1.5 | Used with Mo to improve hardenability and toughness, critical for shock torque resistance. | | **Phosphorus (P)** | **≤ 0.030** | Extremely low to eliminate grain boundary embrittlement under triaxial stress states. | --- #### **4. Physical & Mechanical Properties (Torsion Focus)** This material operates at the frontier of cast material torsional performance. | Property | Value / Performance | Significance for Extreme Torsion Applications | | :--- | :--- | :--- | | **Shear Modulus (G)** | **~66 - 69 GPa (9.6 - 10.0 x 10⁶ psi)** | Very high stiffness minimizes angular deflection, critical for precision and timing. | | **Torsional Yield Strength (approx.)** | **~500 - 600 MPa (73 - 87 ksi)** | Estimated as **0.8 - 1.0 x Tensile Yield Strength (620 MPa)**. Exceptionally high resistance to plastic twist. | | **Ultimate Torsional Strength (approx.)** | **~750 - 850 MPa (109 - 123 ksi)** | Estimated as **0.9 - 1.0 x Tensile Strength (830 MPa)**. | | **Tensile Properties (Certification Basis)** | **830 MPa UTS, 620 MPa YS, 2% Elongation (min)** | The baseline for qualification. | | **Fatigue Limit (Torsional)** | **~350 - 420 MPa** | **Exceptional.** The ausferritic/martensitic microstructure provides outstanding resistance to failure under high-cycle reversed torsion. | | **Hardness** | **280 - 360 HBW (30-38 HRC)** | Provides supreme resistance to fretting, wear, and brinelling in splines and bearing areas. | | **Damping Capacity** | **2-3 times greater than steel** | A significant advantage over steel, reducing noise and high-frequency torsional vibrations. | --- #### **5. Product Applications (Extreme Torsion-Dominant)** This grade is reserved for the most critical, highly loaded torsional components in demanding industries. * **High-Performance & Racing:** **Driveshafts, half-shafts, and torsion bars** for high-horsepower automotive and motorsport applications. * **Heavy-Duty Powertrain:** **Main transmission input/output shafts for mining trucks, locomotive drive shafts, and high-torque PTO shafts** for oilfield equipment. * **Aerospace & Defense:** **Actuator drive shafts, rotor mast components, and torsion-critical linkages** in aerospace systems. * **Industrial Machinery:** **Main spindle shafts for high-power machining centers, rolls in heavy rolling mills, and mixer shafts for high-viscosity materials.** * **Energy & Marine:** **High-speed compressor shafts, turbine coupling shafts, and propulsion shafting components** for demanding marine applications. --- #### **6. Fabrication & Design Notes** * **Condition:** **Exclusively Supplied Heat-Treated (ADI or QT).** The specific heat treatment cycle is integral to the material specification. * **Design Philosophy:** Can utilize the **extremely high torsional yield strength** for maximum power density. **Advanced FEA modeling**, including fatigue analysis, is mandatory. **Surface compressive stresses** induced by processes like shot peening or roller burnishing are highly beneficial for fatigue life. Attention to **geometric stress concentrators** is absolutely critical. * **Machinability:** **Very Difficult.** All significant machining must be performed in a soft, annealed state prior to final heat treatment. Post-heat treatment finishing is limited to grinding, honing, or hard machining with PCBN/PCD tooling. * **Surface Enhancement:** **Induction hardening** or **nitriding** can be applied to specific areas (e.g., splines, bearing journals) to achieve surface hardness >55 HRC for extreme wear resistance, while the ADI/QT core provides the strength. --- #### **7. Ordering Information** Specification must be unambiguous and process-defined. **Specify:** **"Austempered Ductile Iron (ADI) Castings, per ASTM A897 Grade 1050/700/05 [or equivalent], for Extreme Torsional Application"** OR **"Quenched & Tempered Ductile Iron Castings, Grade 120-90-02, per [Proprietary Specification]."** **Mandatory Requirements:** * **Exact Heat Treatment Process & Standard.** * **Minimum Mechanical Properties** (Tensile, Yield, Hardness). * **Torsional Performance Requirements** (design torque, fatigue life cycles). * **Section Size & Geometry** (for hardenability validation). * **Certification:** Full traceability with MTR, heat treatment charts, mechanical tests, microstructure report, and mandated NDT reports (100% UT & MPI). * **Validation Testing:** **Component-level torsion and fatigue testing** is typically required for design qualification. **Grade 120-90-02 (ADI/QT) transcends conventional ductile iron, enabling the design of ultra-high-strength torsional components that withstand forces once exclusive to premium alloy steel forgings, while offering unique benefits in damping, complexity, and cost.** -:- For detailed product information, please contact sales. -: Ductile Iron torsion grade 120-90-02 Specification Dimensions Size： Diameter 20-1000 mm Length <6542 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 120-90-02 Properties -:- For detailed product information, please contact sales. -:

Applications of Ductile Iron Tube torsion grade 120-90-02 -:- For detailed product information, please contact sales. -: Chemical Identifiers Ductile Iron Tube torsion grade 120-90-02 -:- For detailed product information, please contact sales. -:

Packing of Ductile Iron Tube torsion grade 120-90-02 -:- 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 Tube 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 3013 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