AISI 50B44H 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 50B44H Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 50B44H Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 50B44H Steel Product Information -:- For detailed product information, please contact sales. -: **Product Datasheet: AISI 50B44H Boron-Treated Hardenability Steel** --- ### **1. Product Overview** AISI 50B44H is a **medium-carbon, boron-treated alloy steel supplied with guaranteed hardenability characteristics**, designated by the "H" suffix. This specification ensures the steel will consistently meet defined depth-of-hardness requirements, making it a reliable and cost-effective choice for **high-volume production of critical, heat-treated components**. The intentional boron addition provides exceptional hardenability—equivalent to steels with higher alloy content—while maintaining a leaner, more economical chemical composition. It is primarily used in the quenched and tempered condition to achieve an optimal balance of strength, toughness, and wear resistance. --- ### **2. Key International & Equivalent Standards** | Region/System | Standard Designation | Description | | :--- | :--- | :--- | | **USA (Primary)** | **SAE J404, J412, J770** | Standard designation: **AISI 50B44H** | | **USA (Hardenability)** | **ASTM A304** | Standard Specification for Alloy Steel Bars Subject to End-Quench Hardenability Requirements | | **USA (Material)** | **ASTM A29/A29M** | Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought | | **Europe (Functional Equivalent)** | Similar to **34CrB4 (1.7321) + H** concept | No direct equivalent; European EN standards less commonly specify boron H-steels. | | **Japan (Similar)** | Approx. **SCr440H-B (Modified)** | JIS G4052/4053 (Alloy steels for machine structural use) | **Core Concept:** The "H" designation signifies the steel is purchased to meet specific **end-quench (Jominy) hardenability bands** as defined in ASTM A304, not just chemical composition ranges. This guarantees predictable and uniform heat treatment response. --- ### **3. Chemical Composition (Weight %)** *Typical ladle ranges for hardenability control. Actual composition may vary to meet the H-band requirement.* | Element | Minimum | Maximum | Typical | Primary Function | | :--- | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.42 | 0.49 | 0.44 | Primary strength & hardness. | | **Manganese (Mn)** | 0.75 | 1.00 | 0.85 | Base hardenability, strength. | | **Phosphorus (P)** | — | 0.035 | 0.020 | Residual impurity (controlled). | | **Sulfur (S)** | — | 0.040 | 0.025 | Improves machinability. | | **Silicon (Si)** | 0.15 | 0.35 | 0.25 | Deoxidizer, solid solution strengthener. | | **Boron (B)** | 0.0005 | 0.003 | 0.0015 | **Critical Hardenability Enhancer.** Maximizes depth of hardening efficiently. | | **Residual Alloys (Cr, Ni, Mo)** | Report or as agreed | Typically ≤ 0.35% each | | Minor contributions. | **Note for "H" Steels:** The acceptable chemical composition range is typically wider than for non-"H" grades. The **Jominy Hardenability Test** is the governing acceptance criterion. --- ### **4. Hardenability & Mechanical Properties** #### **Guaranteed Hardenability (ASTM A304)** - The steel is supplied to a specific **Hardenability Band** (e.g., Band H1, H2, etc.), which defines the allowable range of hardness values at given distances on the Jominy end-quench test bar. - **Typical Jominy Performance:** Due to boron, 50B44H exhibits a relatively flat hardenability curve. A hardness of **40 HRC can typically be maintained out to J20-J30 (20-30 mm from quenched end)** or further, depending on the specific heat's chemistry and grain size. - This ensures **consistent through-hardening** in oil for sections up to approximately **75-100 mm (3-4 inches)** in diameter. #### **Mechanical Properties (After Quench & Temper)** *Properties are a function of tempering temperature. Below are typical ranges.* | Tempering Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation (%) | Reduction of Area (%) | Typical Hardness (HRC) | | :--- | :--- | :--- | :--- | :--- | :--- | | **200°C (400°F)** | 1650 - 1850 MPa | 1400 - 1650 MPa | 8 - 12 | 35 - 45 | 50 - 55 | | **425°C (800°F)** | 1250 - 1400 MPa | 1100 - 1250 MPa | 12 - 16 | 45 - 55 | 38 - 43 | | **540°C (1000°F)** | 1000 - 1150 MPa | 850 - 1000 MPa | 16 - 20 | 50 - 60 | 30 - 35 | | **650°C (1200°F)** | 750 - 850 MPa | 650 - 750 MPa | 20 - 25 | 60 - 65 | 22 - 27 | #### **Physical Properties** - **Density:** 7.85 g/cm³ - **Modulus of Elasticity (Young's):** 205 GPa - **Poisson's Ratio:** 0.29 - **Machinability (Annealed):** Fair (approx. 60% of 1212 steel standard). --- ### **5. Heat Treatment Guidelines** | Process | Parameters | Notes | | :--- | :--- | :--- | | **Forging** | 1150°C - 900°C (2100°F - 1650°F) | Do not forge below 850°C (1560°F). Anneal after forging. | | **Annealing** | 830°C - 860°C (1525°F - 1580°F), slow cool | For optimal machinability (~187-229 HB). | | **Normalizing** | 870°C - 900°C (1600°F - 1650°F), air cool | Refines grain structure. | | **Austenitizing** | 830°C - 860°C (1525°F - 1580°F) | Use protective atmosphere to prevent decarburization. | | **Quenching** | **Oil quench** (rapid agitation recommended) | Excellent through-hardening in oil due to boron. | | **Tempering** | **Immediately after quench.** 200°C - 650°C (400°F - 1200°F), 1-2 hrs per inch of thickness. | Mandatory to relieve stresses and achieve desired toughness. | --- ### **6. Primary Applications** AISI 50B44H is selected for **high-stress components** requiring consistent, predictable hardening in manufacturing, particularly in the automotive and heavy equipment sectors: - **Automotive:** Axle shafts (rear axle), torsion bars, steering knuckles, high-strength bolts (Grade 10.9+), gear blanks, crankshafts. - **Agricultural & Construction:** Gears, drive shafts, track rollers, pivot pins, plow beams, harrow discs. - **General Engineering:** Hydraulic piston rods, spindles, couplings, large fasteners, and machinery parts subject to high bending/torsional loads. - **Industrial Fasteners:** High-performance studs, bolts, and special fasteners requiring guaranteed core properties. --- ### **7. Key Advantages & Selection Rationale** - **Consistent Performance:** The **H-band guarantee** ensures uniform heat treatment response from batch to batch, critical for automated production and quality control. - **Cost-Effective Strength:** Achieves hardenability and strength levels similar to more expensive steels like 4140H or 4340H, offering significant material cost savings. - **Design Flexibility:** Suitable for larger cross-sections where uniform through-hardening is required with a relatively mild quench (oil), minimizing distortion and cracking risks. - **Quality Assurance:** Supplied with certified mill test reports including actual Jominy hardenability data, providing engineers with reliable data for design and process validation. --- ### **Important Processing Notes & Limitations** - **Weldability:** **Poor.** Requires careful procedure: low-hydrogen electrodes, preheating (200-300°C / 400-570°F), and post-weld tempering are essential to prevent cold cracking. - **Boron Effectiveness:** Hardenability depends on "active" boron. Steelmaking must control nitrogen (often via Ti or Al additions) to prevent boron nitride formation. - **Notch Sensitivity:** In high-hardness conditions (>45 HRC), components are sensitive to sharp notches and surface defects; proper fillet design and good surface finish are critical. - **Distortion Control:** Although oil quenching is less severe, complex parts may still distort. Martempering (hot oil quench) can be used to reduce thermal gradients and distortion. --- **Disclaimer:** This datasheet provides characteristic values based on industry standards and typical processing. For critical applications, the material must be ordered to **ASTM A304** with a specified hardenability band. Final mechanical properties are dependent on the component's geometry, exact heat treatment parameters, and prior processing history. Prototype testing under simulated service conditions is strongly recommended. -:- For detailed product information, please contact sales. -: AISI 50B44H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4096 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 50B44H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 50B44H Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 50B44H Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 50B44H 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 567 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