100CrMo7-3 825B 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. -: Ovako 100CrMo7-3 825B Steel Flange, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: Ovako 100CrMo7-3 825B Steel Flange, Spheroidize annealing Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100CrMo7-3 825B Steel, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100CrMo7-3 825B Steel – Spheroidize Annealed Condition** ## **Product Overview** Ovako 100CrMo7-3 825B is a **specialized, high-carbon, high-molybdenum bearing steel** supplied in a **spheroidize annealed condition**, engineered for applications demanding **exceptional hardenability, high core strength, and superior toughness**. This alloy represents a distinct variant within the 100CrMo family, characterized by a **significantly elevated molybdenum content (approx. 0.3%)**. The **"825B"** designation indicates Ovako's **premium controlled-quality grade** for this specific chemistry, featuring enhanced homogeneity and consistent processing. The spheroidize annealed microstructure provides excellent machinability and prepares the material for achieving maximum hardness, deep hardenability, and outstanding mechanical properties after through-hardening heat treatment. ## **Key Features & Benefits** * **Exceptional Hardenability for Large Sections:** The high molybdenum content dramatically increases hardenability, enabling **full and uniform through-hardening in very large cross-sections** (significantly beyond standard 100Cr6 or even standard 100CrMo7). This prevents soft core formation and ensures consistent high hardness and strength throughout heavy components. * **Superior Strength and Toughness Combination:** Molybdenum is a potent strengthener and grain refiner. It contributes to **very high tensile and yield strength** at standard hardness levels while simultaneously **improving impact toughness and fracture resistance**. This provides an excellent balance for components subjected to both high static/dynamic loads and potential shock. * **Excellent Wear and Rolling Contact Fatigue Resistance:** The combination of high carbon, chromium, and molybdenum promotes a fine dispersion of hard, stable carbides within a tough martensitic matrix after hardening. This results in **outstanding resistance to abrasive wear and rolling contact fatigue**. * **Enhanced Temper and Thermal Stability:** The elevated molybdenum content significantly increases resistance to softening during tempering and exposure to moderate operational temperatures. This allows components to **retain hardness and strength better in warm environments** or permits the use of higher tempering temperatures to optimize toughness. * **Controlled Quality for Predictable Performance:** The 825B grade ensures tight control over chemical composition and a homogeneous spheroidized annealed structure. This leads to **predictable machining behavior, uniform response to heat treatment, and reliable final properties**, which is critical for high-value components. ## **International Standards & Designations** This steel corresponds to a specific high-molybdenum variant within bearing steel standards. | Region/Standard | Standard Designation | Common Name / Equivalent | | :--- | :--- | :--- | | **EUR (EN)** | **~1.3539** (Approximate) | The likely standard designation. The name **100CrMo7-3** describes its typical chemistry (C~1%, Cr~1.5%, Mo~0.3%). | | **ISO** | **ISO 683-17: 100CrMo7-3** | Recognized variant within the bearing steel standard. | | **Germany (DIN / W-Nr.)** | **100CrMo7-3 / ~1.3539** | | | **USA (AISI/ASTM)** | **No direct equivalent.** | Functionally similar to a high-hardenability modified **52100** with significant Mo addition, approaching some characteristics of **AISI 4340** but with higher carbon. | | **Ovako Designation** | **825B** | **"825"** correlates with the approximate material number; **"B"** denotes a specific, controlled quality level within Ovako's production. | ## **Chemical Composition (Typical - %)** The composition is defined by its elevated molybdenum content. | Element | Content (%) | Role | | :--- | :--- | :--- | | **Carbon (C)** | 0.93 - 1.05 | Provides the basis for high-carbon martensite and carbide formation. | | **Chromium (Cr)** | 1.40 - 1.70 | Enhances hardenability and promotes wear-resistant chromium carbides. | | **Molybdenum (Mo)** | **0.25 - 0.35** | **Key performance driver.** Dramatically increases hardenability and hardenability depth; refines grain structure; significantly improves toughness and strength; greatly enhances tempering resistance. | | **Manganese (Mn)** | 0.25 - 0.45 | Increases hardenability. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and solid solution strengthener. | | **Sulfur (S)** | ≤ 0.010 | Kept low for good transverse properties. | | **Phosphorus (P)** | ≤ 0.020 | Kept low. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (Spheroidize Annealed Condition)** * **Delivery Hardness:** **190 - 220 HB** (Typical aim: ~205 HB) * **Microstructure:** **Fine spheroidized carbides** in a ferritic matrix. * **Tensile Strength:** ~700 - 850 MPa * **Yield Strength (Rp0.2):** ~450 - 600 MPa * **Elongation (A5):** ≥ 15% * **Machinability:** Good for its alloy content. ## **Properties After Hardening & Tempering (Typical Process)** * **Austenitizing:** 840-860°C. * **Quenching:** Oil quench. The high Mo content ensures full hardening even with moderate quench severity in large sections. * **Tempering:** 150-220°C. Double tempering is strongly recommended. Higher tempering temps (180-220°C) can be used to optimize toughness due to Mo's strong tempering resistance. * **Final Hardness:** **60 - 64 HRC** (Highly uniform through thick sections) * **Through-Hardening Capacity:** Can fully harden sections **> 100 mm** in diameter. * **Toughness:** Very good for the achieved hardness and strength level. ## **Typical Applications** This material is specified for large, heavily loaded components requiring guaranteed through-hardening and high performance. * **Large-Diameter, Heavy-Section Bearings:** Slewing rings for cranes and excavators, backup roll bearings, and large bearing rings for industrial gearboxes and wind turbines. * **Heavy-Duty Gearing for Large Machinery:** Main drive gears, pinions, and planetary gears in mining, marine, and heavy industrial equipment. * **High-Strength Shafts and Arbors:** Main spindles, kingpins, and axles for heavy machinery requiring deep hardenability and high torsional/bending strength. * **Tooling and Wear Parts for Severe Service:** Dies, forming tools, and wear plates where extreme compressive strength and wear resistance are needed in large cross-sections. * **Critical Components in Oil & Gas Equipment:** Large pins, links, and transmission parts in drilling and pumping equipment. ## **Processing Guidelines** * **Machining:** Perform all machining in the soft, spheroidize annealed condition. * **Heat Treatment (Customer Process):** 1. **Preheating:** Highly recommended to ~650-700°C. 2. **Austenitizing:** 840-860°C in a controlled atmosphere. Adequate soaking time is required. 3. **Quenching:** Agitated oil quench is standard. High hardenability allows for full hardening even with moderate quench rates, reducing distortion risk. 4. **Tempering:** **Double tempering** at 170-220°C is strongly recommended to achieve optimal toughness and dimensional stability. The high Mo content allows effective tempering at these temperatures without excessive hardness loss. * **Grinding:** Perform after hardening. Use proper techniques to avoid thermal damage. ## **Summary** **Ovako 100CrMo7-3 825B Steel in the Spheroidize Annealed condition** is a **high-performance engineering steel designed for the most demanding heavy-section applications**. Its elevated molybdenum content shifts its capabilities into a league beyond standard bearing steels, offering guaranteed deep hardenability, high strength, and remarkable toughness in large components. For engineers designing the core structural and rotating elements of mega-machinery—where material performance must be consistent from surface to center—the 825B grade provides a robust, reliable, and technologically advanced solution. It is the strategic choice when component size and load requirements exceed the capabilities of conventional through-hardening grades. -:- For detailed product information, please contact sales. -: Ovako 100CrMo7-3 825B Steel, Spheroidize annealing Specification Dimensions Size： Diameter 20-1000 mm Length <5300 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. -: Ovako 100CrMo7-3 825B Steel, Spheroidize annealing Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100CrMo7-3 825B Steel Flange, Spheroidize annealing -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100CrMo7-3 825B Steel Flange, Spheroidize annealing -:- For detailed product information, please contact sales. -:

Packing of Ovako 100CrMo7-3 825B Steel Flange, Spheroidize annealing -:- 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 1771 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