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

Ovako 100CrMo7-3 825Q Steel, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100CrMo7-3 825Q Steel – Spheroidize Annealed Condition** ## **Product Overview** Ovako 100CrMo7-3 825Q is a **premium-grade, high-hardenability bearing steel** supplied in a **spheroidize annealed condition**, engineered for applications demanding **exceptional micro-cleanliness, deep hardenability, and superior fatigue performance**. This alloy represents Ovako's **qualified quality tier** within the high-molybdenum 100CrMo7-3 family, where the **"Q"** designation signifies **enhanced micro-cleanliness and controlled processing** compared to standard grades. The spheroidize annealed microstructure provides optimal machinability and a homogeneous foundation for achieving maximum hardness and outstanding mechanical properties—particularly in large cross-sections—after through-hardening heat treatment. ## **Key Features & Benefits** * **Enhanced Micro-Cleanliness for Superior Fatigue Life:** The 825Q grade features **reduced levels of non-metallic inclusions** (particularly sulfides and oxides) compared to standard industrial qualities. This improved internal cleanliness directly translates to **superior rolling contact fatigue (RCF) life and fracture toughness**, offering greater reliability and extended service life for critical, heavily loaded components. * **Exceptional Deep Hardenability:** The elevated molybdenum content (~0.3%) provides **outstanding hardenability**, enabling uniform through-hardening in **large section sizes (typically >100mm diameter)**. This prevents soft core formation and ensures consistent high hardness and strength throughout heavy components. * **Excellent Strength-Toughness Balance:** Molybdenum acts as a potent strengthener and grain refiner. It contributes to **high tensile and yield strength** at standard hardness levels while simultaneously **improving impact toughness and fracture resistance**. This provides an optimal balance for components subjected to high static/dynamic loads with potential shock exposure. * **Superior Machinability in Annealed State:** The spheroidize annealed condition produces a uniform hardness of **190-220 HB** and a fine dispersion of globular carbides, ensuring **good chip formation, extended tool life, and efficient machining** of complex part geometries prior to heat treatment. * **Controlled Quality for Predictable Performance:** As a defined "Q" grade, it offers guaranteed consistency in chemical composition, microstructure, and annealing response, providing a dependable and predictable material for high-reliability applications in demanding industries. ## **International Standards & Designations** This product is Ovako's premium quality variant of the high-molybdenum 100CrMo7-3 bearing steel. | Region/Standard | Standard Designation | Ovako Designation | Quality Level | | :--- | :--- | :--- | :--- | | **EUR (EN)** | **~1.3539 (100CrMo7-3)** | **100CrMo7-3 825Q** | **"Q" = Qualified, enhanced cleanliness grade.** | | **ISO** | **ISO 683-17: 100CrMo7-3** | | Meets and exceeds standard requirements for inclusion control. | | **Germany (DIN)** | **100CrMo7-3 / ~1.3539** | | Comparable to improved purity quality levels. | | **USA (AISI/ASTM)** | **No direct equivalent.** | | Considered a premium high-hardenability 52100 variant with significant Mo addition. | ## **Chemical Composition (Typical - %)** The composition adheres to strict 100CrMo7-3 limits with enhanced impurity control. | Element | Content (%) | Role & Quality Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.93 - 1.05 | Provides basis for high-carbon martensite. Uniform distribution is ensured. | | **Chromium (Cr)** | 1.40 - 1.70 | Enhances hardenability and promotes wear-resistant carbides. | | **Molybdenum (Mo)** | **0.25 - 0.35** | **Key alloying element.** Dramatically improves hardenability depth, toughness, and tempering resistance. | | **Manganese (Mn)** | 0.25 - 0.45 | Increases hardenability. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and solid solution strengthener. | | **Sulfur (S)** | **≤ 0.008** | **Low sulfur** – a feature of the Q-grade. Minimizes MnS inclusions to enhance fatigue life and transverse properties. | | **Phosphorus (P)** | **≤ 0.015** | Kept low to maximize toughness. | | **Oxygen [O]** | **< 15 ppm** | Controlled low oxygen content to minimize oxide inclusions. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (Spheroidize Annealed Condition)** * **Delivery Condition:** **Spheroidize Annealed (+A)** * **Hardness:** **190 - 220 HB** (Typical aim: ~205 HB) * **Microstructure:** **Uniform dispersion of fine, spheroidized carbides** in a ferritic matrix. * **Tensile Strength:** ~700 - 850 MPa * **Yield Strength (Rp0.2):** ~450 - 600 MPa * **Elongation (A5):** ≥ 18% * **Machinability Rating:** **Excellent** for its alloy class. ## **Properties After Hardening & Tempering (Indicative)** * **Final Hardness:** **60 - 64 HRC** (via standard heat treatment: 840-860°C austenitize, oil quench, temper at 160-200°C) * **Ultimate Tensile Strength:** ~2100 - 2400 MPa * **Yield Strength:** ~1700 - 2000 MPa * **Impact Toughness:** **Very Good**, superior to standard 100Cr6 and comparable bearing steels, due to Mo addition and cleaner microstructure. * **Fatigue Performance:** **Excellent**, significantly benefiting from the cleaner microstructure. * **Through-Hardening Capacity:** Can fully harden sections **> 120 mm** in diameter. ## **Typical Applications** This annealed material is the preferred feedstock for high-performance, large-section components across demanding industries. * **High-Reliability Large-Diameter Bearings:** Slewing rings for cranes and excavators, large roller bearing rings for wind turbine gearboxes and heavy industrial gearboxes. * **Heavy-Duty Gearing Components:** Large module gears and pinions in mining, marine, and heavy industrial equipment requiring deep hardenability. * **Critical Automotive and Truck Components:** High-performance wheel bearings, transmission bearings, and differential components for heavy-duty applications. * **Machine Tool and Large Spindle Components:** Spindles and arbors requiring high stiffness, wear resistance, and reliability in larger diameters. * **Aerospace and Defense Components:** Critical bearings and rotating parts where enhanced toughness, fatigue life, and reliability are required. ## **Processing Guidelines** * **Machining:** All machining should be completed in the soft, spheroidize annealed state for optimal efficiency and tool life. * **Heat Treatment (Customer Process):** 1. **Preheating:** Recommended at 650-700°C, especially for large sections. 2. **Austenitizing:** 840-860°C in a protective atmosphere. Adequate soaking time is required for large masses. 3. **Quenching:** Oil quenching. The high Mo content ensures excellent hardenability even with moderate quench severity. 4. **Tempering:** **Double tempering** at 160-220°C is strongly recommended to achieve optimal toughness and dimensional stability. The molybdenum provides strong secondary hardening resistance. * **Grinding:** Perform final grinding after hardening. The consistent microstructure facilitates stable grinding operations. ## **Summary** **Ovako 100CrMo7-3 825Q Steel in the Spheroidize Annealed condition** is the **premium-quality feedstock for manufacturing high-performance, large-section through-hardened components**. It combines the profound deep-hardening capability of molybdenum alloying with the enhanced fatigue performance guaranteed by "Q" grade micro-cleanliness. This material provides a significant performance uplift over standard grades, offering **extended service life, greater reliability, and improved damage tolerance** in demanding applications. For engineers designing critical components where size, load, and longevity requirements push the limits of conventional bearing steels, the 825Q grade offers a proven, high-integrity solution that balances advanced metallurgical benefits with manufacturing efficiency. It represents the intelligent choice for engineering excellence in the most demanding mechanical systems. -:- For detailed product information, please contact sales. -: Ovako 100CrMo7-3 825Q Steel, Spheroidize annealing Specification Dimensions Size： Diameter 20-1000 mm Length <5306 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 825Q Steel, Spheroidize annealing Properties -:- For detailed product information, please contact sales. -:

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

Packing of Ovako 100CrMo7-3 825Q 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 1777 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