Iron Wire grade 120-90-02

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

Ductile Iron grade 120-90-02 Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: Ductile Iron (Nodular Iron) Grade 120-90-02** --- #### **1. Product Overview** Ductile Iron Grade **120-90-02** represents the **ultimate tier of high-strength ductile iron**, engineered for applications where exceptional tensile strength, yield strength, and wear resistance are absolutely critical, and where component weight minimization is paramount. The grade designation signifies minimum mechanical properties of **120 ksi (830 MPa) tensile strength, 90 ksi (620 MPa) yield strength, and 2% elongation**. This grade is **exclusively produced through specialized heat treatment processes**—most commonly **Austempering (to produce Austempered Ductile Iron - ADI)** or advanced **Quenching and Tempering (QT)**. It delivers performance characteristics that directly compete with low-alloy forged steels and cast steels, while maintaining the design freedom, damping capacity, and cost advantages of cast iron. #### **2. Governing International Standards** This ultra-high-strength grade is primarily defined by heat treatment specifications, as the properties exceed the typical scope of standard as-cast grades. * **Primary Designation:** While it can be referenced under **ASTM A536** as Grade **120-90-02**, its specification and certification are overwhelmingly governed by heat treatment standards. * **ASTM A897/A897M** - *Standard Specification for Austempered Ductile Iron Castings*. This is the **most relevant standard**. Grade 120-90-02 properties correspond closely to **ADI Grades 850/550/10** (higher elongation) or are specified as a custom ultra-high-strength grade beyond the standard table (e.g., 900/650/08, 1000/700/05). * **ISO 17804:** *Austempered spheroidal graphite cast irons – Classification*. Defines grades such as **JS/900/8/380/12** (900 MPa UTS, 8% elongation, 380 HBW), with properties aligning with or exceeding 120-90-02. * **Alternative Designations:** * **Custom QT Specification:** Often defined by proprietary foundry or customer specifications, referencing a quenching and tempering process to achieve the target properties. * **Key Testing Standards:** * **Tensile Test:** ASTM E8 / ISO 6892-1. * **Hardness:** ASTM E10 (Brinell), E18 (Rockwell). * **Microstructure:** ASTM A247 / ISO 945. For ADI, the unique **ausferritic microstructure** (acicular ferrite + high-carbon stabilized austenite) is evaluated. #### **3. Critical Chemical Composition (Base Iron for ADI/QT)** The base iron chemistry is meticulously controlled to ensure optimal response to severe heat treatment. | Element | Target Range (%) | Functional Rationale | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.7 | Provides carbon for solid solution strengthening and graphite formation. Balanced for hardenability. | | **Silicon (Si)** | **2.4 - 2.8** | **Crucially high for ADI.** Suppresses carbide formation during austempering, promotes the formation of high-carbon austenite, and raises the tempering resistance of martensite in QT. | | **Manganese (Mn)** | **0.20 - 0.40 (Max)** | **Stringently limited.** High Mn segregates and stabilizes pearlite/bainite, interfering with the austempering transformation and reducing toughness. Kept low for maximum ductility at this strength level. | | **Magnesium (Mg)** | 0.03 - 0.05 | Standard for nodulization. | | **Copper (Cu)** | 0.6 - 1.2 | Strong hardenability agent and pearlite/bainite promoter. Essential for achieving through-thickness properties in QT and controlling transformation kinetics in ADI. | | **Molybdenum (Mo)** | **0.3 - 0.6** | **The most critical alloy for hardenability.** Prevents the formation of soft, high-temperature transformation products (like pearlite) during quenching or the initial stage of austempering, especially in heavy sections. | | **Nickel (Ni)** | 0.5 - 1.5 | Often used with Mo to improve hardenability, refine microstructure, and enhance toughness without forming carbides. | | **Trace Elements (Sn, Sb)** | **Near Zero** | Tightly controlled to prevent segregation and embrittlement. | #### **4. Physical & Mechanical Properties** This grade operates at the performance frontier of cast ferrous materials. | Property | Minimum / Typical Value | Key Characteristics | | :--- | :--- | :--- | | **Tensile Strength, min.** | **120 ksi (830 MPa)** | Can reach **>150 ksi (1035 MPa)** in optimized ADI/QT grades. | | **Yield Strength (0.2% offset), min.** | **90 ksi (620 MPa)** | Exceptionally high yield-to-tensile ratio (0.75+), enabling lightweight, high-stress design. | | **Elongation, min.** | **2%** | Limited but crucial ductility, providing a safety margin over purely brittle materials. ADI can offer higher elongation at similar strength. | | **Hardness** | 280 - 360 HBW
(Approx. 30 - 38 HRC) | Provides outstanding resistance to abrasion, galling, and contact fatigue. | | **Modulus of Elasticity** | 165 - 175 GPa | Maintains high stiffness. | | **Charpy Impact (Unnotched) @ 23°C** | 8 - 15 J (Typical for QT)
**15 - 30 J (Typical for ADI)** | **A key ADI advantage:** Superior toughness at equivalent hardness/strength compared to QT martensite. | | **Fatigue Endurance Limit** | **350 - 400 MPa** (≈ 0.4-0.45 x UTS) | **Excellent,** often superior to quenched and tempered steels of similar hardness due to the graphite nodules' crack-blunting effect and (in ADI) compressive surface stresses. | | **Density** | 7.1 g/cm³ | | | **Primary Microstructure** | **ADI:** **Ausferrite** (fine acicular ferrite + 20-40% high-carbon austenite).
**QT:** **Tempered Martensite** (low-temperature tempered). | The ausferritic structure of ADI provides the best combination of ultra-high strength and good toughness. | #### **5. Product Applications** This grade is specified for the most extreme duty cycles where performance limits are pushed. * **High-Performance Automotive & Racing:** **Formula 1 & top-tier racing engine crankshafts, connecting rods, gearbox gears, and suspension uprights.** For ultimate weight savings and strength. * **Heavy Mining & Earthmoving:** **Gears and pinions for ultra-class haul trucks & excavators, crusher cones and jaws, heavy-duty track system components.** * **Defense & Aerospace:** **Lightweight armor components, tracked vehicle road wheels, landing gear components, and high-integrity actuator housings.** * **Industrial & Manufacturing:** **High-load precision gears, anvils and hammers for forging, heavy-duty rolls for strip processing, high-pressure isostatic press components.** * **Oil & Gas:** **Gearbox components for top drives, mud pump crankshafts, frac pump fluid end blocks** (where ADI's fatigue and erosion-corrosion resistance are highly valued). #### **6. Fabrication & Quality Assurance Notes** * **Production Route:** **Exclusively heat-treated.** "As-cast" state does not exist for this grade. * **Machinability:** **Very Difficult.** Nearly all machining must be completed in a soft, annealed state prior to final austempering or quenching & tempering. Post-heat treatment machining is limited to grinding, honing, or hard turning with PCBN/PCD tools. * **Weldability:** **Not Recommended.** The carefully engineered microstructure is irreversibly damaged by welding heat. Components are not designed to be welded. * **Quality Control:** Requires the highest level of process control—from melt chemistry and nodularity to precise austempering/quenching parameters. **100% non-destructive testing (UT, MPI)** is standard. **Lot-specific mechanical testing and microstructure verification** are mandatory. #### **7. Ordering Information** Specification must be explicit and process-defined. **Specify:** **"Austempered Ductile Iron (ADI), per ASTM A897, Grade 900/650/08 [or Custom Grade targeting 120-90-02 properties]"** OR **"Quenched and Tempered Ductile Iron, Grade 120-90-02 per Proprietary Specification [Ref: XYZ-123]"**. **Mandatory Requirements:** * **Exact Heat Treatment Process & Standard.** * **Minimum Mechanical Properties** (Tensile, Yield, Elongation, Hardness Range). * **Section Size & Weight** of the casting (for hardenability validation). * **Certification:** Full traceability with Mill Test Report including chemistry, pre-heat treatment properties, final mechanical tests, microstructure report (including nodularity and, for ADI, ausferrite content), and results of specified NDT. * **Approval of Heat Treatment Profile** (time-temperature curves) may be required for critical parts. **Grade 120-90-02 (and its ADI/QT equivalents) represents the pinnacle of ductile iron technology, offering designers a cast material solution capable of replacing high-performance steels in the most demanding applications on earth.** -:- For detailed product information, please contact sales. -: Ductile Iron grade 120-90-02 Specification Dimensions Size： Diameter 20-1000 mm Length <6523 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 120-90-02 Properties -:- For detailed product information, please contact sales. -:

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

Packing of Ductile Iron Wire 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 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 2994 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