1,We Manufacturing processes are primarily classified into four types:
1:Forging,
2:Casting,
3:Cutting,
4:Rolling.
2,We can manufacture in accordance with these standards.
Standards:
GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards).
Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others.
The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160.
The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500.
Flange Classification
1. **According to Chemical Industry Standards:** Flanges are classified as follows:
Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)).
2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows:
Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation).
3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows:
Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange.
4. **According to Connection Method/Type:** Flanges are classified as follows:
Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc.
5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges.
6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges.
A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts."
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Austempered Ductile Iron Flange 125-80-10 (Obsolete with ASTM A897/A897M-06) Product Information
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Austempered Ductile Iron Flange 125-80-10 (Obsolete with ASTM A897/A897M-06) Synonyms
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Austempered Ductile Iron 125-80-10 (Obsolete with ASTM A897/A897M-06) Product Information
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# **Product Technical Data Sheet: Austempered Ductile Iron – Obsolete Grade 125-80-10**
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## **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.
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## **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.
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## **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. |
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## **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. |
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## **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.**
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## **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.
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## **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.
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## **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.**
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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
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Austempered Ductile Iron 125-80-10 (Obsolete with ASTM A897/A897M-06) Properties
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Applications of Austempered Ductile Iron Flange 125-80-10 (Obsolete with ASTM A897/A897M-06)
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Chemical Identifiers Austempered Ductile Iron Flange 125-80-10 (Obsolete with ASTM A897/A897M-06)
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Packing of Austempered Ductile Iron Flange 125-80-10 (Obsolete with ASTM A897/A897M-06)
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Standard Packing:
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Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Flange 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
