AISI 6145 Steel Flange (UNS G61450)

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 6145 Steel Flange (UNS G61450) Product Information -:- For detailed product information, please contact sales. -: AISI 6145 Steel Flange (UNS G61450) Synonyms -:- For detailed product information, please contact sales. -:

AISI 6145 Steel (UNS G61450) Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: AISI 6145 (UNS G61450) Chromium-Vanadium Through-Hardening Steel** ### **Overview** AISI 6145 is a medium-carbon, low-alloy **chromium-vanadium steel** designed primarily for **through-hardening** applications. Unlike the 61xx series grades used for case hardening (e.g., 6118, 6120), 6145 has a higher carbon content, allowing it to develop high strength and hardness throughout its entire cross-section when quenched and tempered. The addition of vanadium provides grain refinement and enhances toughness, making it an excellent choice for high-strength components requiring good fatigue resistance and wearability. It is widely used in automotive, machinery, and tooling applications where uniform hardness and strength are critical. --- ### **1. Chemical Composition (Typical % by Weight, AISI/SAE Standard)** The composition of AISI 6145 is balanced to provide good hardenability, strength, and toughness through its carbon, chromium, and vanadium content. | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.43 - 0.48 | **Key element.** Provides high strength and hardness through the formation of martensite upon quenching. The level is optimized for a combination of hardness and toughness after tempering. | | **Manganese (Mn)** | 0.70 - 0.90 | Increases hardenability, allowing deeper and more uniform hardening in larger sections. | | **Phosphorus (P)** | ≤ 0.035 | Impurity; kept low to prevent cold brittleness. | | **Sulfur (S)** | ≤ 0.040 | Impurity; standard low level ensures good ductility and fatigue properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and strengthens the ferrite matrix, contributing to strength. | | **Chromium (Cr)** | 0.80 - 1.10 | Enhances hardenability significantly, improves wear resistance, and provides good tempering resistance for strength retention at elevated temperatures. | | **Vanadium (V)** | 0.15 (min) | **Critical addition.** A strong carbide former and grain refiner. Inhibits grain growth during austenitizing, resulting in a finer martensitic structure that improves **toughness and fatigue strength**. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties** **A. Physical Properties (Annealed State)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus (Young's Modulus):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~48 W/m·K * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶ /K (20-100°C) **B. Mechanical Properties (After Quenching & Tempering)** *Note: Properties vary significantly with section size and tempering temperature.* * **Typical Heat Treatment:** Austenitize at 830-850°C (1525-1560°F), oil quench, and temper between 425-650°C (800-1200°F). * **Hardness Range (Tempered):** 25 - 55 HRC (Widely adjustable via tempering temperature). * **Tensile Strength:** 700 - 1400 MPa (100 - 200 ksi) * **Yield Strength (0.2% Offset):** 550 - 1200 MPa (80 - 175 ksi) * **Elongation (in 50 mm):** 10% - 20% * **Reduction of Area:** 35% - 50% * **Impact Strength (Charpy V-notch):** Good to excellent for its strength level, thanks to vanadium's grain-refining effect. **Example Properties for a Common Condition (Oil quenched & tempered at ~540°C / 1000°F):** * Hardness: ~32-36 HRC * Tensile Strength: ~1000-1100 MPa (145-160 ksi) * Yield Strength: ~850-950 MPa (123-138 ksi) * Good machinability and toughness at this condition. --- ### **3. Product Applications** AISI 6145 is valued for its ability to be heat treated to a wide range of strength-toughness combinations, making it suitable for numerous high-stress applications. * **Automotive & Trucking:** * **Shafting:** Crankshafts, camshafts, axle shafts, propeller shafts, pump shafts. * **Gears:** Medium-duty gears, pinions, and synchronizer rings. * **Fasteners:** High-strength bolts, studs, and pins. * **General Machinery & Industrial Equipment:** * Spindles, mandrels, and arbors. * Connecting rods, piston rods, and lever arms. * High-strength machine parts subject to fatigue loading. * **Tooling & Dies:** * Wrenches, sockets, and hand tools. * Dies for forming and punching. * Wear plates and guides. * **Agriculture & Off-Highway:** * Gears, shafts, and drive components in tractors and implements. * **Aerospace:** * Non-critical structural components, landing gear parts (secondary), and actuator components. --- ### **4. International Standards & Designations** AISI 6145 is recognized in several major standards, though direct equivalents may have minor compositional variations. | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE/AISI 6145** | Standard designation in the "61xx" (Cr-V) series. | | **UNS (USA)** | **G61450** | Unified Numbering System designation. | | **ASTM (USA)** | **ASTM A322** (Grade 6145) | Standard specification for hot-rolled or cold-finished alloy steel bars. | | **DIN / EN (Germany/EU)** | **~1.8159 (50CrV4)** | The closest and most recognized European equivalent. 50CrV4 has a similar carbon and chromium range and is renowned for its excellent spring properties and toughness. | | **JIS (Japan)** | No direct equivalent | Similar through-hardening chromium steels like **SCr440 (JIS G4104)** have comparable applications but lack vanadium. | | **GB (China)** | **50CrVA (GB/T 3077)** | A nearly identical Chinese specification widely used for spring and high-strength applications. | | **ISO** | **Type 9** (ISO 683-11) | Falls under alloy steels for quenching and tempering. | --- ### **Summary** AISI 6145 (UNS G61450) is a versatile and reliable **medium-carbon chromium-vanadium through-hardening steel**. Its key advantages are: 1. **Excellent Hardenability:** Achieves uniform strength in moderate to large sections. 2. **Superior Toughness:** The vanadium addition refines the grain structure, providing exceptional impact and fatigue resistance for its strength level. 3. **Wide Property Range:** Allows engineers to tailor final hardness and strength (from ~30 to 55 HRC) through tempering to meet specific application needs. It serves as a cost-effective alternative to more highly alloyed steels for applications requiring a combination of high strength, good wear resistance, and reliable toughness, such as critical shafts, fasteners, and machinery components. Its closest international counterpart, **50CrV4**, underscores its standing as a globally respected material for demanding engineering purposes. -:- For detailed product information, please contact sales. -: AISI 6145 Steel (UNS G61450) Specification Dimensions Size： Diameter 20-1000 mm Length <4137 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 6145 Steel (UNS G61450) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 6145 Steel Flange (UNS G61450) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 6145 Steel Flange (UNS G61450) -:- For detailed product information, please contact sales. -:

Packing of AISI 6145 Steel Flange (UNS G61450) -:- 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 608 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