AISI 8625H 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 8625H Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 8625H Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 8625H Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8625H Steel** #### **1. Overview** AISI 8625H is a **hardenability-controlled (H-grade)** variant of the nickel-chromium-molybdenum alloy steel, specifically engineered to deliver **guaranteed and consistent transformation characteristics** during heat treatment. As a member of the 8600 series case-hardening steels, 8625H features a **higher carbon content** than 8620H/8622H grades, providing **superior core strength and hardenability** while maintaining the excellent toughness imparted by nickel. The "H" designation signifies that the material's end-quench (Jominy) hardenability is certified to fall within a narrow, specified band. This guarantees **exceptional batch-to-batch consistency** in final core properties after carburizing, making it an ideal choice for high-volume production of critical, heavily loaded components where performance uniformity is non-negotiable. #### **2. International Standards & Designations** AISI 8625H is defined by international standards that govern both its chemical composition and its guaranteed hardenability range. | Region/System | Standard Designation | Title / Purpose | | :--- | :--- | :--- | | **USA (AISI/SAE)** | **AISI 8625H, SAE J404 & SAE J1268** | Chemical Composition & Hardenability Bands | | **USA (ASTM)** | **ASTM A304** | Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements | | **USA (ASTM)** | **ASTM A914/A914M** | Steel Bars Subject to Restricted Hardenability Bands | | **UNS Number** | **H86250** | Unified Numbering System for H-Steels | | **Europe (EN)** | **1.6526H / 25NiCrMo2-2H** | Hardenability-controlled Equivalent | | **Heat Treatment** | **SAE AMS-H-6875** | Heat Treatment of Steel, General Requirements | | **Japan (JIS)** | **SNCM420H** (Close Equivalent) | Similar Hardenability-controlled Grade | #### **3. Chemical Composition & Hardenability Guarantee** The chemical composition is tightly controlled to ensure the hardenability consistently falls within the certified "H-band," with carbon content being the key differentiator. **Core Composition (% by Weight, AISI 8625H):** | Element | Content Range | Metallurgical Significance | | :--- | :--- | :--- | | **Carbon (C)** | **0.22 - 0.28** | **Primary differentiator:** Higher carbon provides increased core strength and hardenability versus 8620H/8622H. Tightly controlled for H-band consistency. | | **Manganese (Mn)** | 0.70 - 0.95 | Major hardenability agent; range adjusted to meet precise H-band specifications. | | **Phosphorus (P)** | ≤ 0.035 | Impurity control. | | **Sulfur (S)** | ≤ 0.040 | Impurity control. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; solid solution strengthener. | | **Nickel (Ni)** | 0.35 - 0.75 | Enhances core toughness and hardenability; critical for impact resistance. | | **Chromium (Cr)** | 0.35 - 0.65 | Increases hardenability; promotes wear-resistant carbides in the case. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Strong hardenability element; inhibits grain growth; reduces temper embrittlement risk. | **Key Feature: Guaranteed Hardenability Band** The steel is supplied with certification that its Jominy end-quench test results fall within a published, narrow hardness band at specific distances (e.g., J4, J8, J12). This **guarantees predictable and uniform core hardness** after final carburizing and quenching, minimizing performance variation across production batches. #### **4. Mechanical & Physical Properties** *Properties are highly dependent on the final heat treatment. The following represents typical achievable ranges.* **As-Supplied (Annealed/Normalized) Properties:** * **Hardness:** **156 - 207 HB** (Brinell) * **Tensile Strength:** **540 - 690 MPa** (78 - 100 ksi) * **Machinability:** **~60%** of B1112 steel. **Properties After Case Hardening (Carburized & Hardened):** * **Surface (Case) Properties:** * **Hardness:** **58 - 63 HRC** * **Effective Case Depth:** Typically 0.5 - 2.5 mm, as specified. * **Core Properties (H-Grade Advantage):** * **Hardness:** **40 - 52 HRC** (Higher and more predictable than standard 8625). * **Tensile Strength:** **1250 - 1550 MPa** (181 - 225 ksi) * **Yield Strength:** **1050 - 1350 MPa** (152 - 196 ksi) * **Impact Toughness:** Maintains good values due to nickel, despite high strength. * **Section Size Capability:** Enhanced hardenability allows effective heat treatment of larger sections (up to ~150mm/6" diameter) while maintaining core properties. **Physical Properties (Core):** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 205 GPa * **Poisson's Ratio:** 0.29 * **Coefficient of Thermal Expansion:** 12.4 × 10⁻⁶/°C #### **5. Product Applications** AISI 8625H is specified for high-performance, high-volume components where guaranteed core consistency and high load-bearing capacity are critical. * **Heavy-Duty Transmission Gearing:** Large gears for wind turbine gearboxes, mining shovel drives, heavy industrial reducers, and marine transmissions. * **High-Load Bearing Components:** Large-diameter bearing races and rollers in construction, mining, and energy applications. * **Oil & Gas Equipment:** Critical downhole tools, large valve stems, and high-pressure pump components. * **Heavy Vehicle Components:** Final drive gears, differential carriers, and axle shafts for mining trucks and heavy transport. * **Power Generation:** Gear components for turbine drives and large compressor systems. * **Aerospace Secondary Structures:** Heavily loaded actuator components and landing gear parts where material consistency is mandated. #### **6. Key Characteristics & Advantages** * **Guaranteed Core Property Consistency:** The **primary H-grade advantage**. Eliminates batch-to-batch variation in core hardness and strength, ensuring uniform fatigue life, predictable deformation, and reliable assembly (e.g., press fits). * **High Core Strength & Load Capacity:** The increased carbon content provides greater core strength than 8620H/8622H, offering superior support for the hardened case under extreme bending and contact stresses. * **Excellent Hardenability:** Enables successful through-hardening of large cross-sections, making it suitable for heavy-section components. * **Reduced Manufacturing Risk & Scrap:** Virtually eliminates rejects due to core hardness outliers, providing significant cost savings and production stability. * **Optimized for Automated Production:** Predictable machining and heat treatment response allow for optimized, stable manufacturing processes with minimal quality intervention. * **Superior Fatigue Performance:** The consistent, strong core combined with a hard, compressive-stressed case delivers exceptional resistance to bending and contact fatigue. **Conclusion:** **AISI 8625H represents a premium, reliability-focused engineering material designed for the most demanding case-hardening applications.** It successfully combines the **enhanced strength and hardenability of a higher-carbon grade** with the **batch-to-batch consistency guarantees of the H-grade system**. This makes it an indispensable choice for manufacturers of large, heavily loaded components where performance cannot be left to chance. By specifying 8625H, engineers and producers gain not just a material, but a **comprehensive quality assurance solution** that minimizes variability, reduces total cost of ownership, and ensures that every component—from the first to the ten-thousandth—will perform identically under load. For critical applications in energy, heavy machinery, and transportation sectors, AISI 8625H provides the technical excellence and production reliability needed to meet today's most stringent performance standards. -:- For detailed product information, please contact sales. -: AISI 8625H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5744 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 8625H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8625H Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8625H Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 8625H Steel Flange -:- 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 2215 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