ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Sheet,Plate

ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Data Sheet: ASTM A897/A897M-06 Grade 750/500/11 Austempered Ductile Iron (ADI)** --- ## **1. Product Overview** **ASTM A897/A897M-06 Grade 750/500/11** represents a premium **high-strength, high-ductility Austempered Ductile Iron (ADI)**. This material is produced by subjecting standard ductile iron to the **austempering heat treatment process**, resulting in a unique **ausferritic microstructure** of acicular ferrite and high-carbon stabilized austenite. Designated by its tensile strength in megapascals (750 MPa minimum), yield strength (500 MPa minimum), and elongation (11% minimum), this grade delivers an exceptional combination of **very high strength, excellent toughness, and superior fatigue performance**, effectively bridging the gap between conventional ductile iron and forged steel. It is engineered for demanding, dynamically loaded components where weight reduction, wear resistance, and reliability are critical. --- ## **2. Governing Standards & Specifications** This grade is formally defined by the ASTM standard specifically for Austempered Ductile Iron. * **Primary Standard:** * **ASTM A897/A897M-06** - *Standard Specification for Austempered Ductile Iron Castings* * **International Equivalents:** * **ISO 17804:** *Austempered spheroidal graphite cast irons – Classification*. Grade 750/500/11 corresponds to **ADI 750-500-11** or **JS/750/11/260/12**. * **SAE J2477:** *Austempered Ductile Iron Castings*. * **AMS 5317C:** Aerospace Material Specification. * **Key Referenced Testing Standards:** * **ASTM E8:** Tensile Testing * **ASTM E23:** Charpy Impact Testing * **ASTM A247:** Microstructure Evaluation (Graphite & Matrix) * **ASTM E466:** Conducting Force Controlled Constant Amplitude Axial Fatigue Tests --- ## **3. Typical Base Iron Chemical Composition** The properties are achieved through heat treatment of a carefully controlled base ductile iron. A typical composition is balanced for optimal austemperability. | Element | Target Range (wt.%) | Functional Role for ADI Grade 750/500/11 | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.8 | Provides carbon for the ausferrite reaction; high carbon stabilizes the high-carbon austenite phase, enhancing ductility and fatigue crack growth resistance. | | **Silicon (Si)** | **2.4 - 2.8** | **Crucial for ADI.** Suppresses the formation of brittle carbides during austempering, promotes the formation of the beneficial acicular ferrite, and increases the carbon solubility in austenite. | | **Manganese (Mn)** | **0.20 - 0.40** | **Stringently limited.** High Mn segregates to cell boundaries and can stabilize pearlite or bainite, interfering with the austempering transformation and reducing toughness. | | **Molybdenum (Mo)** | **0.15 - 0.30** | Often added to increase hardenability, ensuring the austempering transformation occurs fully through the casting section, especially in thicker parts. | | **Copper (Cu)** | 0.40 - 0.80 | Used as a supplemental hardenability agent and to promote a uniform microstructure. | | **Nickel (Ni)** | 0 - 0.50 | May be added with Mo for hardenability in complex geometries. | | **Magnesium (Mg)** | 0.03 - 0.05 | Ensures spheroidal graphite (nodularity >85%). | | **Trace Elements (Sn, Sb)** | **Minimized** | Strong pearlite promoters; must be controlled to allow the ausferritic transformation. | --- ## **4. Physical & Mechanical Properties** Grade 750/500/11 is characterized by its outstanding balance of strength and ductility. | Property | Minimum Requirement (ASTM A897) | Typical Value / Significance | | :--- | :--- | :--- | | **Tensile Strength (UTS)** | **750 MPa (109 ksi)** | Very high strength, comparable to quenched & tempered low-alloy steels. | | **Yield Strength (0.2% YS)** | **500 MPa (73 ksi)** | High yield strength provides excellent resistance to permanent deformation. | | **Elongation** | **11%** | **Exceptional ductility for its strength level.** This is a key differentiator from conventional high-strength cast irons and many steels, providing damage tolerance. | | **Hardness (Brinell)** | **241 - 302 HBW** | Typically 260-285 HBW. Provides good wear resistance. | | **Modulus of Elasticity** | **165 - 175 GPa** | Similar to standard ductile iron and steel. | | **Charpy Impact (Unnotched)** | **65 - 100 J** | **Excellent impact resistance,** a hallmark of properly austempered ADI. | | **Charpy Impact (V-notch)** | **Typically 18 - 25 J @ 23°C** | Good fracture toughness. | | **Fatigue Endurance Limit** | **~325 - 375 MPa** | **Outstanding.** Typically 0.43-0.50 x UTS. Superior to most steels at similar hardness due to the crack-blunting effect of the graphite nodules and compressive stresses in the matrix. | | **Density** | **~7.1 g/cm³** | Lightweight compared to steel (~7.8 g/cm³). | | **Damping Capacity** | **~3-5x greater than steel** | Advantageous for reducing noise and vibration in dynamic components. | | **Microstructure** | **Fine Ausferrite:** Acicular (needle-like) ferrite in a matrix of **high-carbon stabilized austenite** (typically 25-40% by volume). Graphite nodules are well-spheroidized. The absence of carbides and pearlite is critical. | --- ## **5. Product Applications** Grade 750/500/11 is specified for highly stressed, safety-critical components across multiple industries. * **Automotive & Commercial Vehicles:** * **Differential carriers, ring gears, steering knuckles, suspension components, and brake calipers.** * **High-performance engine connecting rods and crankshafts.** * **Heavy Equipment & Agriculture:** * **Track rollers and links, drive sprockets, and final drive components** for excavators and tractors. * **Gearbox housings and high-strength brackets.** * **Railway:** * **Brake discs, coupler components, and bogie frames.** * **Industrial Machinery:** * **High-load gears, camshafts, press frames, and hydraulic components.** * **Defense:** * **Lightweight armor components, track system parts, and structural housings.** --- ## **6. Austempering Process & Fabrication Notes** * **Heat Treatment Process (Austempering):** This is the core of the material. 1. **Austenitizing:** Heating to 870-900°C to form a homogeneous austenite matrix. 2. **Quenching:** Rapid transfer to a molten salt bath at the **austempering temperature** (typically **290-330°C** for this grade). 3. **Isothermal Transformation:** Holding at the salt bath temperature (1-4 hours) to form the ausferritic microstructure. 4. **Cooling:** Air cooling to room temperature. * **Machinability:** **Fair to Good in the as-austempered condition.** Tougher and more abrasive than ferritic DI but machinable with carbide tooling. **Hard machining** is often performed post-heat treatment. Some components are machined in a soft, pearlitic pre-austempering condition and then final austempered. * **Weldability:** **Not Recommended.** The precise ausferritic microstructure is severely compromised by welding heat, leading to hard, brittle zones (martensite) in the HAZ. ADI components are designed as-cast and heat-treated; repair welding is highly specialized and generally avoided. * **Grindability:** Good. Can be ground to precise dimensions and fine surface finishes. --- ## **7. Ordering Information** **Specify:** **"Austempered Ductile Iron (ADI) Castings, ASTM A897/A897M-06 Grade 750/500/11."** **Critical Details to Provide:** * **Applicable Standard and Full Grade Designation.** * **Part Drawing & Specification.** * **Section Size/Weight:** Critical for the foundry/heat treater to ensure proper hardenability and cycle time. * **Certification Requirements:** Mill Test Report must include: * Base iron chemistry. * Final mechanical properties (Tensile, Yield, Elongation, Hardness). * **Microstructure report** verifying ausferritic matrix and nodularity (per ASTM A247). * Charpy impact test results, if specified. * **Non-Destructive Testing (NDT):** Magnetic particle or fluorescent penetrant inspection is common for critical surfaces. Ultrasonic testing may be specified for internal soundness in high-integrity parts. --- ## **8. Key Advantages & Design Considerations** * **Advantages:** * **High Strength-to-Weight Ratio:** Enables lightweight design. * **Excellent Fatigue Strength:** For long service life under cyclic loads. * **Good Wear Resistance & Damping Capacity.** * **Design Freedom:** Complex near-net shapes achievable via casting. * **Design Considerations:** * **Avoid Sharp Notches:** The high strength makes it notch-sensitive; use generous fillet radii. * **Residual Stresses:** The austempering process induces beneficial compressive surface stresses, but machining can relieve them. Design machining sequences carefully. * **No Post-Heat Treatment Welding.** **ASTM A897 Grade 750/500/11 ADI is a premier engineering material that allows designers to push performance boundaries, offering a unique property set that often enables the replacement of steel forgings or assemblies with a single, high-performance casting.** -:- For detailed product information, please contact sales. -: ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Specification Dimensions Size： Diameter 20-1000 mm Length <6560 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. -: ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A897/A897M-06 Grade 750 (110-70-11) Austempered Ductile Iron Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of ASTM A897/A897M-06 Grade 750 (110-70-11) 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 3031 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