AISI 8660 Steel Flange

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." -:- For detailed product information, please contact sales. -: AISI 8660 Steel Flange, quenched 800°C (1470°F), 425°C (800°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 8660 Steel Flange, quenched 800°C (1470°F), 425°C (800°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 8660 Steel, quenched 800°C (1470°F), 425°C (800°F) temper Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 8660 Steel, Quenched & Tempered Condition** --- #### **1. Product & Heat Treatment Overview** This specification defines **AISI 8660 alloy steel** that has undergone a specific **final heat treatment cycle**: **quenching from 800°C (1470°F)** followed by **tempering at 425°C (800°F)**. This treatment produces a finished component with a **high-strength, high-toughness tempered martensitic microstructure**. AISI 8660 is a **medium-high carbon, nickel-chromium-molybdenum (Ni-Cr-Mo) steel** from the "86xx" series, renowned for its excellent hardenability, strength, and impact resistance. The specified quench and temper parameters are carefully chosen to achieve an optimal balance of these properties for demanding engineering applications. #### **2. Material & Specific Heat Treatment Rationale** - **Base Material (AISI 8660):** A versatile alloy steel with ~0.60% C, ~0.55% Ni, ~0.50% Cr, and ~0.20% Mo. This composition provides deep hardenability and the potential for high strength with good toughness. - **Heat Treatment Cycle Significance:** 1. **Austenitizing/Quenching at 800°C (1470°F):** This temperature is at the **lower end of the standard austenitizing range** (typically 800-830°C). It is chosen to: - Ensure complete austenitization with **minimal grain growth**, promoting a finer prior austenite grain size. - Retain a **controlled amount of undissolved carbides**, which can enhance wear resistance. - Potentially reduce quenching stresses and distortion compared to higher temperatures. - Following this, **oil quenching** transforms the austenite to martensite, providing high hardness and strength. 2. **Tempering at 425°C (800°F):** This is a **medium-high tempering temperature** within the **secondary hardening range** for Mo-containing steels. - It effectively relieves quenching stresses. - Promotes the precipitation of fine alloy carbides (especially Mo₂C), which can lead to **secondary hardening**, maintaining high strength while developing excellent toughness. - The molybdenum content is key here, as it **significantly reduces the risk of temper embrittlement** at this temperature, allowing the steel to achieve a superior toughness-strength balance. #### **3. International Standard & Specifications** - **Material Standard:** **SAE J404** (Chemical Compositions of SAE Alloy Steels) / **AISI 8660** - **Heat Treatment Reference:** While specific temperatures are proprietary, this cycle follows principles outlined in standards like **ASTM A29/A29M** for heat-treated bars and is typical for achieving high-strength grades. - **UNS Designation:** **G86600** - **Common Procurement Spec:** Components would be ordered to a drawing or specification calling out "AISI 8660, Q&T to [Hardness/Strength], Quench: 800°C, Temper: 425°C". - **"H" Grade Variant:** **8660H** (ASTM A304) might be used as the raw material to ensure hardenability consistency prior to this final treatment. #### **4. Chemical Composition (% by Weight, per SAE J404)** | Element | Content Range (%) | Role in this Heat Treatment | | :--- | :--- | :--- | | **Carbon (C)** | **0.56 – 0.64** | Provides high martensitic hardness after quenching; tempered carbides contribute to strength. | | **Manganese (Mn)** | **0.75 – 1.00** | Enhances hardenability for full martensite formation upon quenching. | | **Phosphorus (P)** | **≤ 0.035** | Impurity; kept low. | | **Sulfur (S)** | **≤ 0.040** | Impurity; kept low. | | **Silicon (Si)** | **0.15 – 0.30** | Deoxidizer; provides solid solution strengthening. | | **Nickel (Ni)** | **0.40 – 0.70** | **Key for toughness.** Improves impact resistance of the tempered martensite. | | **Chromium (Cr)** | **0.40 – 0.60** | Increases hardenability and wear resistance; forms stable carbides. | | **Molybdenum (Mo)** | **0.15 – 0.25** | **Critical for this temper.** Enhances hardenability, refines grain, and enables tempering at 425°C without embrittlement, promoting secondary hardening. | | **Iron (Fe)** | **Balance** | Base metal. | #### **5. Resulting Microstructure & Mechanical Properties** **A. Microstructural Outcome:** - **Primary Structure:** **Tempered Martensite** with a fine dispersion of alloy carbides. - **Carbides:** Fine precipitates of Mo₂C, Cr₇C₃, and Fe₃C contributing to strength via secondary hardening. - **Grain Structure:** Fine, due to the controlled lower austenitizing temperature. **B. Typical Achieved Mechanical Properties:** *(For a moderately sized section, e.g., 25-50mm round, properly quenched & tempered)* - **Hardness:** **38 – 44 HRC** (Approx. **363 – 429 HBW**) - **Tensile Strength:** **1200 – 1400 MPa** (174 – 203 ksi) - **Yield Strength (0.2% Offset):** **1050 – 1250 MPa** (152 – 181 ksi) - **Elongation in 50mm:** **12% – 16%** - **Reduction of Area:** **45% – 55%** - **Impact Toughness (Charpy V-notch):** **40 – 70 J** (30 – 52 ft-lb) at room temperature. **This is the key advantage** – high strength coupled with good impact resistance. #### **6. Key Characteristics of this Condition** - **Optimized Strength-Toughness Balance:** This specific treatment aims to maximize toughness at a high strength level, making it suitable for components subject to shock or impact loading. - **Good Wear Resistance:** The combination of hardness and fine carbide dispersion provides respectable wear resistance for many applications. - **Dimensional Stability:** The medium-high tempering temperature effectively relieves quenching stresses, resulting in good dimensional stability for precision components. - **Fatigue Resistance:** The fine tempered martensitic structure typically offers excellent fatigue strength, suitable for cyclic loading applications. #### **7. Typical Applications** Components heat-treated to this specification are used in high-stress, dynamic applications: - **Heavy-Duty Gearing:** **Transmission gears**, **heavy vehicle differential gears**, and **industrial gearbox pinions** requiring high tooth strength and resistance to impact. - **High-Strength Shafts:** **Crankshafts**, **propeller shafts**, and **high-torque drive shafts** for trucks, off-road, and industrial machinery. - **Oil & Gas Equipment:** **Drill string components**, **tool joints**, and **valve stems** subject to high tensile and torsional loads. - **Forged Components:** **Connecting rods**, **forklift tines**, and **earth-moving equipment linkage**. - **Defense Applications:** **Track components**, **suspension parts**, and other armored vehicle components. #### **8. Comparison with Other Tempers (AISI 8660)** | Temper Temperature | Typical Hardness (HRC) | Key Property Emphasis | Best For | | :--- | :--- | :--- | :--- | | **200°C (400°F)** | 48-54 | Maximum Hardness & Wear Resistance | Wear surfaces, cutting edges. | | **425°C (800°F)** | **38-44** | **Optimum Strength-Toughness Balance** | **High-stress, shock-loaded components.** | | **540°C (1000°F)** | 32-38 | High Toughness & Ductility | Very high impact applications, larger sections. | #### **9. Ordering & Further Notes** - **Ordering Specification:** Finished parts are specified per engineering drawing: "Material: AISI 8660, Heat Treated: Quench 800°C / Oil, Temper 425°C. Final Hardness: 40-42 HRC." - **Raw Material:** For consistent results, especially in larger sections, the raw material should be **AISI 8660H** (to ASTM A304) to guarantee hardenability. - **Post-Processing:** This is a **final service condition**. Further machining should be minimal (light grinding) as the material is hard. Welding is **not recommended** and would require complete re-heat treatment. --- **Disclaimer:** The achieved properties are **highly dependent on section size** due to hardenability limitations. The values listed are typical for sections that can be fully hardened (e.g., up to ~50-75mm diameter in oil). For larger sections, core properties will be lower. The specified temperatures must be strictly controlled, and the actual as-quenched microstructure should be verified. This is a performance specification for final parts, not a procurement spec for raw material. -:- For detailed product information, please contact sales. -: AISI 8660 Steel, quenched 800°C (1470°F), 425°C (800°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <5185 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. -: AISI 8660 Steel, quenched 800°C (1470°F), 425°C (800°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8660 Steel Flange, quenched 800°C (1470°F), 425°C (800°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8660 Steel Flange, quenched 800°C (1470°F), 425°C (800°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 8660 Steel Flange, quenched 800°C (1470°F), 425°C (800°F) temper -:- 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 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 1656 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