AISI 6150H 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 6150H Steel Flange, annealed, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 6150H Steel Flange, annealed, 25 mm (1 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 6150H Steel, annealed, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: ## **Product Specification: AISI 6150H Hardenability-Grade Alloy Steel (Annealed Condition)** ### **Product Designation** * **Standard Name:** AISI 6150H / SAE 6150H * **UNS Number:** G61500 (with Hardenability Certification) * **Condition:** **Annealed** (Spheroidize Annealed for optimal machinability) * **Product Form:** Hot-rolled or cold-finished steel bar * **Specified Size:** **25 mm (1 inch) diameter round** * **Key Feature:** **Hardenability-controlled per ASTM A304** ### **Overview** AISI 6150H is the **hardenability-controlled variant** of the standard AISI 6150 chromium-vanadium alloy steel. The "H" designation signifies that the steel is manufactured and certified to meet specific **minimum and maximum hardness values at defined distances on a Jominy end-quench test**, as standardized in ASTM A304. This ensures exceptional consistency in the final heat-treated properties—particularly core hardness and strength—across different production batches. Supplied in the **annealed condition** as a 25 mm round, it offers excellent machinability for critical components that demand predictable and reliable performance after through-hardening. ### **1. Chemical Composition (Range by Weight %, ASTM A304)** The chemical ranges for 6150H are carefully controlled to achieve a predictable hardenability band. The core composition is identical to standard 6150, but element ranges may be slightly adjusted to guarantee the "H" band. | Element | 6150H Range (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.48 - 0.53 | Provides the fundamental capacity for high strength and hardness. | | **Manganese (Mn)** | 0.70 - 0.95 | Primary hardenability agent; range is controlled to tightly manage the Jominy curve. | | **Phosphorus (P)** | ≤ 0.030 | Impurity; controlled at low levels. | | **Sulfur (S)** | ≤ 0.035 | Impurity; low level ensures good transverse properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and solid solution strengthener. | | **Chromium (Cr)** | 0.80 - 1.10 | Significantly enhances hardenability and wear resistance. | | **Vanadium (V)** | 0.15 (min) | **Critical addition.** Provides grain refinement for superior toughness and fatigue strength. | | **Iron (Fe)** | Balance | | ***Procurement Note:*** AISI 6150H is purchased based on its **guaranteed hardenability band**, not just chemistry. The mill test report will include the actual Jominy hardenability test results verifying compliance with the SAE Jominy band for 6150H. ### **2. Physical & Mechanical Properties (Annealed Condition - 25 mm round)** **A. Physical Properties** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus:** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~47.0 W/m·K * **Coefficient of Thermal Expansion:** 11.3 x 10⁻⁶ /K (20-100°C) **B. Mechanical Properties (As-Annealed)** *Typical properties for a spheroidize-annealed 25 mm (1 in.) round.* * **Hardness (Brinell):** 187 - 229 HB * **Hardness (Rockwell):** ~90 - 97 HRB * **Tensile Strength:** 620 - 795 MPa (90 - 115 ksi) * **Yield Strength (0.2% Offset):** 415 MPa (60 ksi) min. * **Elongation:** 22% min. * **Machinability:** ~65% of 1.0% C steel. Excellent for a medium-carbon alloy steel in this condition. **C. Guaranteed Hardenability & Heat-Treated Properties** * **Governing Standard:** **ASTM A304** * **Assurance:** The core hardness of a 25 mm round after proper oil quenching will fall within a predictable, narrow range. * **Typical Jominy Curve:** Shows high surface hardness (J1 ~58-65 HRC) with a gradual decline, suitable for hardening moderate sections like a 1-inch round. * **Achievable Tempered Hardness Range:** 28 - 55 HRC (via tempering between 425-650°C / 800-1200°F). * **Key Benefit:** Minimized lot-to-lot variation in final part strength, distortion, and stress profiles after heat treatment. ### **3. Product Applications** The 6150H grade is specified for high-volume, safety-critical, or performance-critical components where **heat treatment consistency is non-negotiable**. The annealed 25 mm round is a standard feedstock for machining: * **High-Performance Automotive:** Critical crankshafts, camshafts, and high-stress transmission shafts where dynamic balancing and fatigue life are paramount. * **Heavy-Duty Springs:** **A primary application.** Coil and leaf springs for suspension systems (especially commercial vehicles, railroad), where consistent elastic modulus and fatigue performance are required across thousands of parts. * **Aerospace Components:** Actuator shafts, landing gear components, and other parts requiring certified material consistency and predictable response to heat treatment. * **Power Transmission Gears:** High-load gears and pinions in wind turbines, industrial gearboxes, and heavy machinery. * **Hydraulic & Pneumatic Cylinder Rods:** Where consistent hardness and strength prevent bending and wear. ### **4. International Standards & Designations** The "H" concept is a North American (SAE/ASTM) system. Functional equivalents exist but may not have identical hardenability control protocols. | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE 6150H** | The standard "H"-grade designation. | | **ASTM (USA)** | **ASTM A304** (G61500H) | Governing standard for H-band requirements. Also under **ASTM A914** for bars. | | **UNS (USA)** | **G61500** (with H spec) | UNS number is same as 6150; the "H" is a procurement specification. | | **DIN / EN (Germany/EU)** | **1.8159 (50CrV4) + Special Quality** | The chemical equivalent is 50CrV4. Similar consistency is achieved by ordering to a "special quality" specification with added testing (e.g., hardenability verification per customer drawing). | | **JIS (Japan)** | **SUP10 (Special Grade)** | The Japanese spring steel equivalent. "H"-type control is specified through additional agreement on hardenability testing. | | **GB (China)** | **50CrVAH (GB/T 5216)** | The Chinese standard **does have an "H" designation** (50CrVAH) for spring steels with guaranteed hardenability, making it a close functional match. | ### **Processing & Heat Treatment Guidance (for 25 mm round)** 1. **Machining:** Perform all heavy machining in the supplied annealed condition. 2. **Hardening:** Austenitize at 830-860°C (1525-1580°F). For a 25 mm round, **agitated oil quench** is standard to achieve full through-hardening as predicted by the Jominy curve. 3. **Tempering:** **Temper immediately after quenching.** The predictable hardenability allows for precise tempering charts to achieve target core hardness (e.g., tempering at 480°C/900°F typically yields ~42-46 HRC). 4. **Advantage:** Reduced need for extensive hardness testing and sorting of finished parts due to batch consistency. ### **Summary** The **AISI 6150H steel in annealed 25 mm round** represents the **premium, consistency-ensured version** of this high-performance alloy. It is specified when the cost of heat treatment variability or part failure in the field far exceeds the modest material premium. By guaranteeing a specific hardenability band, it provides engineers and manufacturers with predictable core properties, reduced distortion, and reliable performance in critical applications such as automotive springs, shafts, and aerospace components. This product exemplifies the application of statistical process control to high-grade alloy steel production for advanced, high-volume manufacturing. -:- For detailed product information, please contact sales. -: AISI 6150H Steel, annealed, 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <4139 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 6150H Steel, annealed, 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 6150H Steel Flange, annealed, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 6150H Steel Flange, annealed, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 6150H Steel Flange, annealed, 25 mm (1 in.) round -:- 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 610 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