AISI 8630 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 8630 Steel Flange, normalized Product Information -:- For detailed product information, please contact sales. -: AISI 8630 Steel Flange, normalized Synonyms -:- For detailed product information, please contact sales. -:

AISI 8630 Steel, normalized Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8630 Steel, Normalized Condition** AISI 8630 is a versatile low-alloy nickel-chromium-molybdenum steel known for its excellent combination of strength, toughness, and good hardenability. Supplied in the **normalized condition**, this material undergoes a controlled heat treatment (austenitizing followed by air cooling) that refines its grain structure, enhances uniformity, and provides a favorable balance of mechanical properties. This state offers improved machinability and a consistent, homogeneous microstructure, making it an ideal starting point for components that may undergo further heat treatment or for applications requiring moderate strength and good impact resistance. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition is designed to provide good hardenability and core strength, especially in larger sections. * **Carbon (C):** 0.28 - 0.33 * **Manganese (Mn):** 0.70 - 0.90 * **Phosphorus (P):** ≤ 0.035 * **Sulfur (S):** ≤ 0.040 * **Silicon (Si):** 0.20 - 0.35 * **Nickel (Ni):** 0.40 - 0.70 * **Chromium (Cr):** 0.40 - 0.60 * **Molybdenum (Mo):** 0.15 - 0.25 --- ### **2. Physical & Mechanical Properties (Normalized Condition)** Normalization produces a fine-grained mixture of ferrite and pearlite, resulting in the following typical properties: * **Hardness:** **187 - 217 HBW** (Brinell) * **Tensile Strength:** **620 - 757 MPa** (90 - 110 ksi) * **Yield Strength (0.2% Offset):** **415 - 550 MPa** (60 - 80 ksi) * **Elongation (in 50 mm / 2 in):** **≥ 22%** * **Reduction of Area:** **≥ 50%** * **Impact Toughness (Charpy V-Notch):** Typically **40 - 60 J (30 - 44 ft-lb)** at room temperature * **Machinability:** **Fair to Good** (Approximately 65% of a 1% carbon steel standard). The normalized structure provides more consistent machining than the as-rolled condition. * **Density:** **7.85 g/cm³** (0.284 lb/in³) * **Modulus of Elasticity:** **190 - 210 GPa** (27,500 - 30,500 ksi) --- ### **3. Key Features of the Normalized Condition** * **Refined & Uniform Microstructure:** Eliminates the coarse, non-uniform grain structure often found in as-rolled material, leading to more consistent mechanical properties throughout the part. * **Improved Toughness:** The fine grain size significantly enhances impact resistance and ductility compared to the as-rolled state. * **Stress Relief:** Helps to reduce internal stresses induced during forging or hot rolling, minimizing the risk of distortion during subsequent machining. * **Ideal Pre-Condition for Heat Treatment:** Provides a predictable and homogeneous starting structure for final quenching and tempering, ensuring more uniform response and minimized distortion. * **Good Weldability:** The low carbon equivalent and normalized structure contribute to good weldability with proper procedures (pre-heat and post-weld heat treatment are often recommended for thick sections). --- ### **4. Primary Applications** Normalized AISI 8630 is commonly specified for medium-to-heavy section components that require a reliable baseline of strength and toughness for further processing or service. * **Heavy Machinery & Equipment:** Gears, pinions, shafts, rollers, and large bolts used in construction, mining, and agricultural machinery. * **Oil & Gas Industry:** Components for drilling equipment, valve bodies, non-critical pressure-containing parts, and large fittings. * **Power Transmission:** Forged blanks for gears and shafts that will be machined and case-hardened or through-hardened. * **Automotive:** Heavier chassis components, axle beams (for further processing), and other structural forgings. * **General Engineering:** Structural parts requiring better properties than carbon steel but not the full strength of a quenched and tempered state. --- ### **5. Relevant International Standards & Specifications** * **USA – Primary Standards:** * **ASTM A29/A29M:** *Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished* – The normalized condition can be specified as a supplementary requirement. * **SAE J404:** *Chemical Compositions of SAE Alloy Steels* * **SAE J414:** *Standard Specification for Alloy Steel Bars for Carburizing* * **AMS 6280:** *Steel Bars and Forgings, 0.30C - 0.60Cr - 0.55Ni - 0.25Mo (8630) Normalized* * **UNS Designation:** **G86300** * **International Equivalents:** * **Europe (DIN / EN):** **1.6523** (34CrNiMo6-4) is a close, slightly higher-alloyed equivalent. A more direct equivalent in properties is often negotiated. * **International (ISO):** **ISO 683-18** covers alloy steels for heat treatment, including grades similar to 8630. * **Japan (JIS):** **SNC630** is a similar nickel-chromium steel, though exact molybdenum content may vary. --- ### **6. Typical Normalization Heat Treatment** * **Process:** Heat uniformly to a temperature above the upper critical transformation point (**approximately 870°C - 900°C / 1600°F - 1650°F**). * **Soaking Time:** Hold at temperature long enough to ensure complete austenitization (typically 1 hour per inch of thickness minimum). * **Cooling:** Cool in still air to room temperature. The air cooling rate is critical to developing the desired fine-grained structure. --- ### **Conclusion** **AISI 8630 steel in the normalized condition** is a reliable and process-friendly engineering material. It delivers a significant upgrade in consistency, toughness, and machinability over the as-rolled state, making it the preferred supply condition for complex fabrications and critical component blanks. Its role is often that of a **high-quality intermediate product**—providing the optimal foundation for final machining and subsequent heat treatment (such as carburizing or through-hardening) to achieve the high surface hardness or core strength required for demanding applications in heavy industry, energy, and transportation sectors. -:- For detailed product information, please contact sales. -: AISI 8630 Steel, normalized Specification Dimensions Size： Diameter 20-1000 mm Length <6315 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 8630 Steel, normalized Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8630 Steel Flange, normalized -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8630 Steel Flange, normalized -:- For detailed product information, please contact sales. -:

Packing of AISI 8630 Steel Flange, normalized -:- 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 2786 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