AISI 8627H 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 8627H Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 8627H Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 8627H Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8627H Steel** #### **1. Overview** AISI 8627H is a **hardenability-controlled (H-grade)** variant of the high-performance nickel-chromium-molybdenum alloy steel, representing the **premium specification** within the 862X series for applications demanding maximum core strength with guaranteed consistency. This steel combines the **elevated carbon content** of AISI 8627 with the stringent **hardenability band controls** of the H-grade system, ensuring exceptional batch-to-batch uniformity in transformation characteristics. Engineered for **extreme-duty applications**, it delivers an optimal balance of **maximum core strength, superior hardenability, and retained toughness** after carburizing heat treatment. The H-grade certification makes this material particularly valuable for high-volume production of safety-critical components where performance reliability cannot tolerate material variability. #### **2. International Standards & Designations** AISI 8627H complies with international standards governing both chemical composition and guaranteed hardenability ranges. | Region/System | Standard Designation | Title / Purpose | | :--- | :--- | :--- | | **USA (AISI/SAE)** | **AISI 8627H, SAE J404 & SAE J1268** | Chemical Composition & Hardenability Bands | | **USA (ASTM)** | **ASTM A304** | Standard Specification for Steel Bars Subject to End-Quench Hardenability Requirements | | **USA (ASTM)** | **ASTM A914/A914M** | Steel Bars Subject to Restricted Hardenability Bands | | **UNS Number** | **H86270** | Unified Numbering System for H-Steels | | **Europe (EN)** | **1.6528H / 27NiCrMo2-2H** | Hardenability-controlled Equivalent | | **Heat Treatment** | **SAE AMS-H-6875** | Heat Treatment of Steel, General Requirements | | **Aerospace Quality** | **AMS 2300** | Premium Aircraft-Quality Steel (Optional) | | **Japan (JIS)** | **SNCM420H** (Close Equivalent) | Similar Hardenability-controlled Grade | #### **3. Chemical Composition & Hardenability Guarantee** The composition is precisely controlled to ensure consistent hardenability within the specified "H-band," with carbon content being the defining characteristic. **Core Composition (% by Weight, AISI 8627H):** | Element | Content Range | Metallurgical Significance | | :--- | :--- | :--- | | **Carbon (C)** | **0.24 - 0.30** | **Defining element:** Provides maximum core strength in 862X-H series. Tightly controlled for H-band consistency. | | **Manganese (Mn)** | 0.70 - 0.95 | Primary hardenability agent; range optimized for predictable Jominy curve position. | | **Phosphorus (P)** | ≤ 0.025 | Reduced impurity level for improved transverse ductility. | | **Sulfur (S)** | ≤ 0.025 | Controlled impurity for balanced machinability and properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; solid solution strengthener. | | **Nickel (Ni)** | 0.40 - 0.75 | **Critical toughener:** Maintains impact resistance despite high carbon; content stabilized for consistent hardenability. | | **Chromium (Cr)** | 0.40 - 0.65 | Enhances hardenability depth; promotes wear-resistant carbide formation. | | **Molybdenum (Mo)** | 0.15 - 0.30 | Strong hardenability element; suppresses temper embrittlement; refined range for consistency. | **Key Feature: Guaranteed Hardenability Band** The material is supplied with certified Jominy end-quench test results guaranteed to fall within a narrow, published hardness range. This ensures **predictable and uniform core hardness** after final heat treatment, with typical batch-to-batch variation of ≤2 HRC for a given section size—critical for high-reliability applications. #### **4. Mechanical & Physical Properties** *Properties are process-dependent. The following represents typical achievable ranges with proper heat treatment.* **As-Supplied (Annealed/Normalized) Properties:** * **Hardness:** **167 - 217 HB** (Brinell) * **Tensile Strength:** **570 - 725 MPa** (83 - 105 ksi) * **Machinability:** **~50%** of B1112 steel (Requires optimized tooling and parameters). **Properties After Case Hardening (Carburized & Hardened):** * **Surface (Case) Properties:** * **Hardness:** **58 - 63 HRC** * **Effective Case Depth:** Typically 0.8 - 3.0 mm, as specified. * **Case Toughness:** Optimized through controlled carbon potential. * **Core Properties (H-Grade Advantage):** * **Hardness:** **44 - 55 HRC** (Predictable within narrow band due to H-grade certification). * **Tensile Strength:** **1350 - 1650 MPa** (196 - 239 ksi) * **Yield Strength:** **1150 - 1450 MPa** (167 - 210 ksi) * **Charpy Impact (Room Temp):** **30 - 50 J** (22 - 37 ft-lb) * **Core Fracture Toughness:** Good for strength level, maintained by nickel. * **Maximum Section Capability:** Exceptional hardenability allows proper through-hardening of sections exceeding **200 mm (8")** diameter. **Physical Properties (Core):** * **Density:** **7.85 g/cm³** * **Modulus of Elasticity:** **205 GPa** * **Poisson's Ratio:** **0.29** * **Thermal Conductivity:** **~42 W/m·K** at 100°C * **Coefficient of Thermal Expansion:** **12.2 × 10⁻⁶/°C** (20-100°C) #### **5. Product Applications** AISI 8627H is specified for the world's most demanding mechanical power transmission and load-bearing applications where both extreme performance and guaranteed consistency are required. * **Mega-Scale Gearing:** Main gears for mining draglines, bucket wheel excavators, ultra-large industrial reducers, and marine main propulsion systems. * **Critical Aerospace Components:** Heavy-duty landing gear parts, helicopter main transmission gears, and actuator components for large aircraft. * **Energy Sector Extremes:** Main gearboxes for multi-megawatt wind turbines, large compressor drives, and critical power generation transmission components. * **Ultra-Heavy Vehicles:** Final drive components for 400+ ton mining trucks, large crawler tractor transmissions, and heavy military vehicle drive systems. * **Defense Applications:** Tank transmission gears, naval gun mount components, and other high-stress armament systems. * **Specialty Industrial:** Rolling mill pinions, large crusher drives, and other extreme-service machinery components. #### **6. Key Characteristics & Advantages** * **Guaranteed Core Consistency:** The **primary H-grade advantage**—ensures uniform core hardness (44-55 HRC) with minimal lot-to-lot variation, critical for predictable fatigue life and assembly performance. * **Maximum Strength in 862X-H Series:** Highest achievable core strength while maintaining nickel-alloy toughness characteristics. * **Exceptional Hardenability:** Capable of through-hardening the largest practical industrial component sections with uniform properties. * **Superior Bending Fatigue Resistance:** The strong, consistent core provides unmatched resistance to tooth bending failure in massive gears. * **Optimized for Production Reliability:** Eliminates heat treatment surprises—rejects due to core hardness outliers are virtually eliminated. * **Reduced Quality Assurance Costs:** H-grade certification reduces need for extensive destructive testing in finished components. * **Design Margin Certainty:** Engineers can utilize higher design stresses with confidence in material consistency. **Process Considerations:** * **Controlled Quenching Essential:** High carbon content increases quench cracking risk; requires sophisticated quenching (marquenching, press quenching, or intensive agitation). * **Tempering Imperative:** Must be tempered (typically 150-200°C) immediately after quenching to relieve stresses and optimize toughness. * **Machining Strategy:** Best machined in annealed condition with rigid tooling; post-heat treatment grinding may be required for precision components. * **Weldability:** Limited; requires specialized procedures with preheat (250-350°C) and post-weld heat treatment. **Economic & Quality Justification:** - **Higher Initial Cost** offset by reduced scrap rates and improved production yields - **Extended Component Life** through optimized and consistent material properties - **Reduced Warranty Claims** from predictable performance in service - **Essential for Certified Applications** where material traceability and consistency are mandated **Conclusion:** **AISI 8627H represents the ultimate evolution of case-hardening steel technology for extreme-duty applications where both maximum performance and guaranteed consistency are non-negotiable requirements.** This material transforms the inherent capabilities of high-carbon nickel steel into a **reliable engineering system** through the H-grade certification process. By eliminating the natural variability of alloy steel production, 8627H provides designers and manufacturers with a **predictable performance platform** for the world's most demanding mechanical systems. For applications where component failure carries catastrophic consequences—whether economic, environmental, or human safety—and where components operate at the absolute limits of mechanical design, AISI 8627H offers not just superior strength, but more importantly, **certified consistency**. This combination makes it the material of choice for critical applications in mining, energy, aerospace, and defense sectors, where the total cost of ownership justifies investment in premium materials with guaranteed performance characteristics. -:- For detailed product information, please contact sales. -: AISI 8627H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5746 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 8627H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8627H Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8627H Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 8627H 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 2217 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