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."
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AISI 4820H Steel Flange, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Product Information
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AISI 4820H Steel Flange, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Synonyms
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AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Product Information
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**Product Datasheet: AISI 4820H Steel, Direct Quenched & Tempered**
**1. Product Overview**
This datasheet describes a high-performance case-hardening steel, AISI 4820H, processed via a specialized **Direct Quenching** method from the carburizing pot followed by a low-temperature temper. The material features a hardened case depth of **0.99 mm (0.039 inches)**, offering an exceptional combination of a very hard, wear-resistant surface and a tough, ductile core. This process optimizes microstructural refinement and residual stress profiles, enhancing fatigue strength and load-bearing capacity.
**2. Key International Standards**
* **Material Designation:** AISI 4820H, SAE 4820H (U.S.A.), Corresponds to European EN 20NiCrMo2-2 (1.6523).
* **H-Steel Designation:** The "H" suffix indicates steel produced to specific hardenability band requirements as per **ASTM A304**.
* **Processing Standard:** The direct quenching practice is often aligned with principles in **AMS 2759/7** (Carburizing and Hardening of Steel Parts) and **SAE J1268**.
**3. Chemical Composition (Weight %)**
The composition is tightly controlled to ensure consistent hardenability (H-Band).
| Element | Min (%) | Max (%) | Typical (%) | Function |
| :--- | :--- | :--- | :--- | :--- |
| **Carbon (C)** | 0.17 | 0.23 | 0.20 | Core strength & hardenability |
| **Manganese (Mn)** | 0.40 | 0.70 | 0.55 | Hardenability, strength |
| **Phosphorus (P)** | - | 0.035 max | 0.020 | Residual element |
| **Sulfur (S)** | - | 0.040 max | 0.025 | Machinability (forms inclusions) |
| **Silicon (Si)** | 0.15 | 0.35 | 0.25 | Deoxidizer, strength |
| **Nickel (Ni)** | 3.20 | 3.60 | 3.40 | Core toughness, hardenability |
| **Chromium (Cr)** | 0.35 | 0.65 | 0.50 | Hardness, wear resistance |
| **Molybdenum (Mo)**| 0.20 | 0.30 | 0.25 | Hardenability, temper resistance |
**4. Physical & Mechanical Properties (Typical After Direct Quench & Temper @150°C)**
* **Case Depth (CHD):** **0.99 mm** (Effective Case Depth to 550 HV).
* **Surface Hardness:** **58-63 HRC** (660-780 HV).
* **Core Hardness:** **35-45 HRC** (dependent on part size).
* **Core Tensile Strength:** ~ **1150 - 1400 MPa**.
* **Core Yield Strength:** ~ **950 - 1200 MPa**.
* **Core Elongation:** ~ **12 - 18%**.
* **Impact Toughness (Core):** Excellent due to Ni-Mo content and direct quench refinement.
**5. Key Characteristics & Advantages**
* **Superior Fatigue Performance:** The direct quench process results in a finer prior austenite grain size and favorable compressive residual stresses in the case, significantly improving bending fatigue and contact fatigue resistance.
* **Enhanced Dimensional Stability:** Reduced distortion compared to reheat quenching processes, lowering subsequent machining/finishing costs.
* **Deep Hardening Capability:** The Ni-Cr-Mo alloy system provides high hardenability, ensuring deep and uniform hardening even in larger cross-sections.
* **Optimal Property Gradient:** Provides a seamless transition from the ultra-hard case to the strong, shock-absorbing core.
**6. Primary Applications**
This material and process combination is engineered for high-stress, heavy-duty components requiring maximum durability:
* **Gearboxes:** Heavy-duty transmission gears, pinions, synchronizer hubs (for automotive, trucking, mining, and wind energy).
* **Power Transmission:** High-load planetary gears, splined shafts, differential side gears.
* **Aerospace:** Critical gears and bearing components in auxiliary systems.
* **Industrial Machinery:** Heavy-duty rollers, camshafts, pins, and high-wear components in construction and agricultural equipment.
**7. Processing Notes**
* **Direct Quench:** The component is quenched directly from the carburizing temperature, eliminating a full reheat cycle.
* **Tempering:** A mandatory low-temperature temper at **150°C (300°F)** is performed to relieve quenching stresses without significantly reducing hardness, improving ductility and stability.
* **Post-Processing:** Components may undergo finishing processes like grinding or shot peening to achieve final dimensions and further enhance fatigue performance.
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**Disclaimer:** The values provided are typical. For critical applications, specific testing and validation against agreed-upon specifications between supplier and customer are required.
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AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4090 mm
Size:We can customized as required
Standard：
Per your request or drawing
We can customized as required
Properties（Theoretical）
Chemical Composition
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AISI 4820H Steel, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth Properties
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Applications of AISI 4820H Steel Flange, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth
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Chemical Identifiers AISI 4820H Steel Flange, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth
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Packing of AISI 4820H Steel Flange, direct quenched from pot, tempered (150°C (300°F)), 0.99 mm case depth
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Standard Packing:
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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 561 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
