SAE J2477 AD 750 Automotive Austempered Ductile Iron Sheet,Plate

SAE J2477 AD 750 Automotive Austempered Ductile Iron Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: SAE J2477 AD 750 Automotive Austempered Ductile Iron Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

SAE J2477 AD 750 Automotive Austempered Ductile Iron Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: SAE J2477 AD 750 Automotive Austempered Ductile Iron (ADI)** --- #### **1. Product Overview** **SAE J2477 AD 750** is a standardized **high-strength Austempered Ductile Iron (ADI)** specification developed by the Society of Automotive Engineers (SAE) specifically for automotive applications. The "AD 750" designation indicates a **minimum tensile strength of 750 MPa (109 ksi)**. This material is produced via the **austempering heat treatment process**, which transforms the microstructure into a unique **ausferritic matrix** of acicular ferrite and high-carbon stabilized austenite. Designed to meet the rigorous demands of modern automotive engineering, AD 750 offers an optimal balance of **high strength, excellent fatigue resistance, good ductility, and significant weight-saving potential** compared to traditional forged steel components. It enables part consolidation, improved durability, and enhanced performance in safety-critical and highly stressed automotive systems. --- #### **2. Governing Standards & Specifications** This specification is part of the SAE's dedicated framework for automotive-grade Austempered Ductile Iron. * **Primary Standard:** * **SAE J2477** - *Austempered Ductile (Nodular) Iron Castings (Automotive)*. * **Related & Equivalent Standards:** * **ASTM A897/A897M:** The closest equivalent is **Grade 750/500/11** (750 MPa UTS, 500 MPa YS, 11% elongation). SAE J2477 aligns with but may include additional automotive-specific requirements. * **ISO 17804:** Corresponds to **ADI 750-500-11** or **JS/750/11/260/12**. * **ISO 16112:** *Compacted (vermicular) graphite cast irons* is a different material family. * **Key Referenced Testing Standards (per SAE):** * **Tensile Test:** ASTM E8 * **Hardness:** ASTM E10 (Brinell) * **Impact Test:** ASTM E23 (Charpy) – May be specified. * **Microstructure:** ASTM A247 --- #### **3. Typical Chemical Composition (Base Iron)** The base iron chemistry is designed for reliable response to austempering in automotive production environments. | Element | Target Range (%) | Functional Role for AD 750 | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.8 | Ensures adequate carbon for ausferrite formation and austenite stabilization. | | **Silicon (Si)** | **2.4 - 2.8** | **Critical.** Suppresses carbide formation during austempering, promotes carbon enrichment of austenite, and is essential for achieving good ductility and toughness. | | **Manganese (Mn)** | **≤ 0.30** | Kept low to prevent segregation and the formation of brittle phases at cell boundaries, which are detrimental to impact properties. | | **Molybdenum (Mo)** | **0.15 - 0.30** | Commonly added to ensure sufficient hardenability for consistent properties through the section thickness of typical automotive castings. | | **Copper (Cu)** | 0.4 - 0.8 | Often used as a cost-effective hardenability agent and to promote a uniform microstructure. | | **Nickel (Ni)** | 0 - 0.5 | May be added in combination with Mo for complex geometries or heavier sections. | | **Magnesium (Mg)** | 0.03 - 0.05 | Ensures high nodularity (>85%). | | **Phosphorus (P)** | **≤ 0.04** | Kept very low to avoid embrittlement. | | **Sulfur (S)** | **≤ 0.015** | Kept very low. | --- #### **4. Physical & Mechanical Properties** AD 750 provides a robust combination of properties ideal for dynamically loaded automotive components. | Property | SAE J2477 AD 750 Requirement / Typical Value | Automotive Significance | | :--- | :--- | :--- | | **Tensile Strength (UTS), min.** | **750 MPa (109 ksi)** | High strength for load-bearing and safety components. | | **Yield Strength (0.2% YS), min.** | **500 MPa (73 ksi)** | Provides high resistance to permanent deformation under service loads. | | **Elongation, min.** | **10%** | **Good ductility** is crucial for absorbing energy in crash events and tolerating stress concentrations. | | **Hardness (Brinell)** | **241 - 302 HBW** | Typically 260-285 HBW. Offers good wear resistance for moving parts. | | **Modulus of Elasticity** | ~165 - 172 GPa | High stiffness for precise component operation. | | **Charpy Impact (Unnotched)** | **60 - 100 J (Typical)** | **Excellent impact resistance**, a key safety and durability attribute. | | **Fatigue Endurance Limit** | **~325 - 375 MPa** (≈ 0.43-0.50 x UTS) | **Superior fatigue performance** compared to quenched & tempered steels of similar hardness, critical for components under cyclic loading (e.g., suspension, drivetrain). | | **Density** | **~7.1 g/cm³** | **Approximately 10% lighter than steel**, contributing directly to vehicle weight reduction and improved fuel efficiency. | | **Damping Capacity** | **3-5 times greater than steel** | Reduces noise, vibration, and harshness (NVH) – a significant advantage in automotive applications. | | **Microstructure** | **Fine Ausferrite** (acicular ferrite + 25-40% high-carbon austenite) with spheroidal graphite. Achieved via austempering in the range of **280-330°C (535-625°F)**. | This structure is responsible for the unique combination of high strength and good ductility. | --- #### **5. Product Applications in Automotive** SAE J2477 AD 750 is specified for a wide range of high-integrity automotive components. * **Powertrain & Drivetrain:** * **Differential carriers and cases, ring gears, drive pinions, transmission gears and housings, clutch components, and flywheels.** * **Chassis & Suspension:** * **Steering knuckles, control arms, suspension links, brake calipers, and hub carriers.** Its strength and fatigue resistance are critical here. * **Engine Components:** * **Turbocharger housings, engine brackets, and select high-stress components.** * **Commercial & Heavy-Duty Vehicles:** * **Wheel hubs, axle components, and fifth-wheel assemblies.** --- #### **6. Austempering Process & Automotive Manufacturing Notes** * **Heat Treatment Process:** Must be tightly controlled for automotive volume production. * **Austenitizing:** 870-900°C * **Quenching & Austempering:** Rapid quench to 280-330°C salt bath, held for 1-3 hours. * **Cooling:** Air cool. * **Process Robustness:** The chosen austempering temperature range for AD 750 offers a relatively **wider processing window** compared to higher-grade ADIs, which is advantageous for high-volume, consistent automotive manufacturing. * **Machinability:** **Fair to Good** in the austempered condition, but more demanding than ferritic ductile iron. Most high-volume production utilizes **near-net-shape casting** and **hard machining** with carbide tooling. Some components are machined in a soft state prior to austempering. * **Weldability:** **Not Recommended.** Welding destroys the ausferritic microstructure in the heat-affected zone. Automotive components are designed as single castings without the need for welding. * **Quality Systems:** Production for automotive applications must comply with **IATF 16949** quality management standards. **Statistical Process Control (SPC)** for chemistry, microstructure, and mechanical properties is mandatory. --- #### **7. Ordering & Quality Assurance (Automotive Focus)** **Specify:** **"Austempered Ductile Iron Castings, SAE J2477 AD 750."** **Critical Automotive Requirements:** * **Material Certification:** Mill Test Report (MTR) per heat/lot, including chemistry and mechanical properties from separately cast test bars. * **Process Certification:** Documentation of austempering cycle parameters (time/temperature). * **Microstructure Certification:** Report confirming ausferritic microstructure and nodularity per ASTM A247. * **First Article Inspection (FAI) & PPAP (Production Part Approval Process):** Submission of full documentation at specified levels (Level 3 typical) is required for part approval. * **Dimensional Reporting:** Capability data (Cp/Cpk) for critical dimensions. * **Non-Destructive Testing (NDT):** 100% visual inspection. Magnetic particle or fluorescent penetrant inspection is often required for critical safety components (per drawing specification). --- #### **8. Value Proposition for Automotive Design** **SAE J2477 AD 750 provides automotive engineers with a compelling alternative to forged steel, offering:** 1. **Weight Reduction:** ~10% lighter weight for direct mass savings. 2. **Part Consolidation:** Complex geometries cast as one piece reduce assembly cost and weight. 3. **Improved Fatigue Life:** Enhanced durability under cyclic loads. 4. **Superior Damping:** Better NVH characteristics. 5. **Cost-Effectiveness:** Often lower total system cost compared to a machined steel forging or assembly. **It is a key enabler for lightweighting, efficiency, and performance in modern vehicle design.** -:- For detailed product information, please contact sales. -: SAE J2477 AD 750 Automotive Austempered Ductile Iron Specification Dimensions Size： Diameter 20-1000 mm Length <6567 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. -: SAE J2477 AD 750 Automotive Austempered Ductile Iron Properties -:- For detailed product information, please contact sales. -:

Applications of SAE J2477 AD 750 Automotive Austempered Ductile Iron Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers SAE J2477 AD 750 Automotive Austempered Ductile Iron Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of SAE J2477 AD 750 Automotive Austempered Ductile Iron Sheet/Plate -:- 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 3038 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