Austempered Ductile Iron Tube,Pipe 125-80-10 (Obsolete with ASTM A897/A897M-06)

Austempered Ductile Iron Tube 125-80-10 (Obsolete with ASTM A897/A897M-06) Product Information -:- For detailed product information, please contact sales. -: Austempered Ductile Iron Tube 125-80-10 (Obsolete with ASTM A897/A897M-06) Synonyms -:- For detailed product information, please contact sales. -:

Austempered Ductile Iron 125-80-10 (Obsolete with ASTM A897/A897M-06) Product Information -:- For detailed product information, please contact sales. -: # **Product Technical Data Sheet: Austempered Ductile Iron – Obsolete Grade 125-80-10** --- ## **1. Product Overview** **Austempered Ductile Iron (ADI) Grade 125-80-10** was a **very high-strength, moderate-ductility grade** specified under **historical material standards prior to the adoption of the current metric-based ASTM A897/A897M classification system**. The designation "125-80-10" followed the **US customary unit convention**, indicating minimum properties of **125 ksi (862 MPa) tensile strength, 80 ksi (552 MPa) yield strength, and 10% elongation**. This grade represented the **upper echelon of conventional ADI strength** and was engineered for applications demanding the absolute maximum in load-bearing capacity and wear resistance from an austempered structure, while retaining a fundamental level of toughness. Its properties are directly superseded by modern **ASTM A897 Grade 1200/850/10** or similar high-strength ADI grades. --- ## **2. Historical Standards & Current Equivalents** This grade is obsolete and is no longer formally specified in current ASTM standards. * **Historical/Obsolete Designation:** * **Grade 125-80-10** (US Customary Units - ksi) * **Superseding Modern Standard:** * **ASTM A897/A897M-06 (and later revisions)** - *Standard Specification for Austempered Ductile Iron Castings* * **Direct Modern Metric Equivalent:** * **ASTM A897 Grade 1200/850/10** (1200 MPa UTS, 850 MPa YS, 10% Elongation) * **ISO 17804:** **ADI 1200-850-10** or **JS/1200/10/380/12** * **Note on Nomenclature:** The transition from US customary (ksi) to metric (MPa) designations was formalized to align with global engineering practice. **125-80-10** is the direct predecessor of **1200/850/10**, with slight rounding in property conversion. --- ## **3. Typical Base Iron Chemical Composition (Historical Practice)** To achieve this strength level, the base iron required careful alloying for hardenability and microstructural control. | Element | Target Range (wt.%, Historical) | Functional Role for High-Strength ADI | | :--- | :--- | :--- | | **Carbon (C)** | 3.5 - 3.7 | Provides carbon for the ausferrite reaction; balanced for strength and stability of high-carbon austenite. | | **Silicon (Si)** | **2.4 - 2.7** | **Critical.** Suppresses carbide formation; must be high enough to enable the austempering reaction but controlled to avoid excessive stabilization of austenite which can reduce strength. | | **Manganese (Mn)** | **0.20 - 0.35** | **Very low.** Essential to prevent segregation and the formation of martensite or carbides in the last-to-freeze regions, which would be detrimental to toughness. | | **Molybdenum (Mo)** | **0.25 - 0.45** | **Essential alloy.** Provides the hardenability required to achieve a fully ausferritic microstructure in the casting section size, preventing the formation of high-temperature transformation products (pearlite) during quenching. | | **Copper (Cu)** | **0.70 - 1.00** | **Primary alloying element.** Works synergistically with Mo to provide uniform hardenability and strengthen the austenite phase. | | **Nickel (Ni)** | 0.5 - 1.0 | Often added with Mo, especially in complex or heavy sections, to ensure through-hardening without creating quench cracks. | | **Magnesium (Mg)** | 0.03 - 0.05 | For nodularity. | | **Trace Elements** | **Tightly restricted** | Elements like Sn, Sb, which promote pearlite, were minimized. | --- ## **4. Physical & Mechanical Properties (Historical / Obsolete Spec)** This grade was defined by its exceptional strength and hardness. | Property | Minimum Requirement (Obsolete 125-80-10) | Equivalent Modern (ASTM 1200/850/10) | Key Characteristics | | :--- | :--- | :--- | :--- | | **Tensile Strength (UTS)** | **125 ksi (862 MPa)** | **1200 MPa (174 ksi)** | Ultra-high strength, approaching some low-alloy steels. | | **Yield Strength (0.2% YS)** | **80 ksi (552 MPa)** | **850 MPa (123 ksi)** | Very high resistance to plastic deformation. | | **Elongation** | **10%** | **10%** | Moderate ductility for its strength class; provides essential damage tolerance. | | **Hardness (Brinell)** | **302 - 363 HBW** (Typical: 321-341) | **302 - 375 HBW** | Very high hardness, providing excellent resistance to abrasion and contact stress. | | **Charpy Impact (Unnotched)** | **40 - 70 J** (Typical) | Similar | Good impact energy absorption, though lower than lower-strength ADI grades. | | **Fatigue Endurance Limit** | **~400 - 480 MPa** (0.46-0.56 x UTS) | Similar | **Excellent fatigue resistance,** a key advantage of the ausferritic structure. | | **Microstructure** | **Fine Ausferrite** with a **lower volume fraction of high-carbon austenite** (typically 15-25%) compared to lower-strength ADI grades. The austempering temperature for this grade was **low (typically 230-270°C)**, producing a finer, stronger acicular ferrite structure. | --- ## **5. Typical Historical Applications** This grade was used for the most heavily loaded components where weight savings and wear resistance were paramount. * **Heavy-Duty Gearing:** **Final drive ring gears and pinions** for mining trucks, large agricultural equipment, and heavy construction machinery. * **Track Systems:** **Track shoes, links, and rollers** for large excavators and crawler tractors subjected to extreme abrasion and impact. * **High-Performance Automotive:** **High-load racing transmission gears, differential components, and specialized drivetrain parts.** * **Industrial Wear Parts:** **Crusher components, slurry pump wear parts, and high-stress rollers.** * **Military Applications:** **Components for tracked vehicle suspensions and drive systems.** --- ## **6. Fabrication & Processing Notes (Historical Context)** * **Austempering Process:** Required precise control. The **low austempering temperature** (230-270°C) was key to achieving the high strength but narrowed the processing window and increased sensitivity to casting section size and chemistry variations. * **Machinability:** **Very Difficult** in the final austempered condition due to extreme hardness. Almost all machining was performed in a soft, normalized, or pearlitic pre-austempering condition. Final operations were limited to grinding. * **Weldability:** **Not Weldable.** The carefully engineered ausferritic microstructure was completely destroyed by welding heat, leading to untempered martensite and cracking in the HAZ. * **Quality Challenge:** Achieving consistent properties, especially elongation and impact values, throughout a complex casting was more challenging for this grade than for lower-strength ADI due to the narrow processing window. --- ## **7. Ordering & Modern Specification Practice** **This grade is obsolete. For new designs or replacement parts, the modern metric equivalent must be specified.** **Specify:** **"Austempered Ductile Iron (ADI) Castings, ASTM A897/A897M Grade 1200/850/10 (superseding obsolete Grade 125-80-10)."** **Essential Details for Modern Equivalent:** * **Clear reference to the modern standard and grade (ASTM A897 1200/850/10).** * **Part drawing and all performance requirements.** * **Certification to the modern standard,** including chemistry, mechanical properties, and microstructure report verifying ausferrite. * **Section size** of the casting must be provided to the heat treater for process validation. --- ## **8. Summary: Transition to Modern Standards** **The grade "125-80-10" is a historical artifact of US customary unit specification. Its obsolescence underlines the global harmonization of engineering standards.** * **Reason for Obsolescence:** Adoption of the **SI system (MPa)** in ASTM A897 to align with international (ISO) practice and eliminate confusion. * **Technical Legacy:** It represented the practical limit of conventional austempering technology for achieving maximum strength while retaining useful ductility. The processing knowledge developed for this grade directly informs the production of modern **Grade 1200/850/10**. * **Importance for MRO (Maintenance, Repair & Overhaul):** When replacing a component originally specified as "125-80-10", the correct modern material to procure is **ASTM A897 Grade 1200/850/10**. The slight numerical differences are due to unit conversion and standard rounding; the materials are technically equivalent. **While the designation is obsolete, the performance benchmark it represented remains valid and is fully captured within the current, globally recognized ASTM A897/A897M specification system.** -:- For detailed product information, please contact sales. -: Austempered Ductile Iron 125-80-10 (Obsolete with ASTM A897/A897M-06) Specification Dimensions Size： Diameter 20-1000 mm Length <6561 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. -: Austempered Ductile Iron 125-80-10 (Obsolete with ASTM A897/A897M-06) Properties -:- For detailed product information, please contact sales. -:

Applications of Austempered Ductile Iron Tube 125-80-10 (Obsolete with ASTM A897/A897M-06) -:- For detailed product information, please contact sales. -: Chemical Identifiers Austempered Ductile Iron Tube 125-80-10 (Obsolete with ASTM A897/A897M-06) -:- For detailed product information, please contact sales. -:

Packing of Austempered Ductile Iron Tube 125-80-10 (Obsolete with ASTM A897/A897M-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 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 3032 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