Cast Stainless Steel Flange HK40, UNS J94204

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. -: Cast Stainless Steel Flange HK40, UNS J94204 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Flange HK40, UNS J94204 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel HK40, UNS J94204 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Data Sheet: Cast Stainless Steel HK40 (UNS J94204)** **Product Overview** UNS J94204 is the Unified Numbering System designation for the cast stainless steel commonly known as HK40. This high-carbon, austenitic heat-resistant alloy is part of the 25Cr-20Ni family and represents one of the most widely used materials for high-temperature applications. The alloy combines excellent oxidation resistance with outstanding creep and rupture strength, making it particularly suitable for components operating under heavy mechanical loads in extreme temperature environments up to 1150°C (2100°F). --- #### **1. International Standards & Designations** UNS J94204 is recognized across multiple international standards systems: | Standard Organization | Designation | | :--- | :--- | | **UNS (Unified Numbering System)** | **J94204** | | **ACI/SFSA (USA)** | **HK-40** | | **ASTM International** | A297 Grade HK40 | | **ASTM International** | A351/A351M Grade HK40 | | **European Norm (EN)** | 1.4848 | | **German (DIN)** | G-X 40 CrNiSi 25-12 | | **Japanese (JIS)** | SCH 22 | --- #### **2. Chemical Composition (Weight %)** The chemical composition of UNS J94204 is critical to its high-temperature performance: | Element | Composition (%) | | :--- | :--- | | **Carbon (C)** | 0.35 - 0.45 | | **Chromium (Cr)** | 23.0 - 27.0 | | **Nickel (Ni)** | 19.0 - 22.0 | | **Silicon (Si)** | 1.75 max | | **Manganese (Mn)** | 1.50 max | | **Phosphorus (P)** | 0.04 max | | **Sulfur (S)** | 0.04 max | | **Iron (Fe)** | Balance | **Key Composition Features:** - **High Carbon Content**: Provides superior creep strength through solid solution strengthening and carbide formation - **Chromium-Rich**: Ensures exceptional oxidation and carburization resistance - **Nickel-Stabilized Austenite**: Maintains structural stability under thermal cycling --- #### **3. Typical Physical & Mechanical Properties** **Physical Properties:** - **Density**: 7.78 g/cm³ - **Melting Range**: 1350-1400°C (2460-2550°F) - **Thermal Conductivity**: 14.0 W/m·K at 100°C - **Specific Heat**: 500 J/kg·K - **Coefficient of Thermal Expansion**: 16.0 × 10⁻⁶ /K (20-100°C) - **Modulus of Elasticity**: 200 GPa at 20°C **Mechanical Properties (Room Temperature):** - **Tensile Strength**: 620 MPa minimum - **Yield Strength (0.2% Offset)**: 310 MPa minimum - **Elongation**: 10% minimum in 2 inches - **Hardness**: 170-240 HB **High-Temperature Capabilities:** - **Maximum Service Temperature**: 1150°C (2100°F) in oxidizing atmospheres - **Creep Strength**: Excellent long-term load-bearing capacity - **Oxidation Resistance**: Superior performance in direct-fired service - **Thermal Fatigue Resistance**: Good resistance to thermal cycling --- #### **4. Product Applications** UNS J94204 is specified for critical high-temperature components across multiple industries: **Petrochemical Industry:** - Steam methane reformer tubes and headers - Ethylene cracking furnace components - Pressure vessel parts for refinery applications **Heat Processing Equipment:** - Radiant tubes for carburizing and annealing furnaces - Furnace retorts, muffles, and trays - Heat treatment fixtures and baskets **Power Generation:** - Waste-to-energy plant components - Biomass boiler parts - High-temperature valve bodies and fittings **Other Applications:** - Glass manufacturing hardware - Cement plant preheater components - Chemical processing reactor parts --- #### **5. Fabrication Characteristics** **Casting Performance:** - Excellent castability with good fluidity - Suitable for both static and centrifugal casting processes - Minimal tendency for hot tearing **Machining:** - Difficult to machine due to work-hardening tendency - Requires carbide tools and rigid setups - Recommended slow speeds with heavy feeds **Welding:** - Weldable using SMAW, GTAW, and GMAW processes - Matching filler metals (ENiCrFe-3 type) recommended - Post-weld heat treatment at 1150-1200°C essential **Heat Treatment:** - Solution annealing temperature: 1150-1200°C (2100-2200°F) - Rapid cooling (water quench or fast air) required - Stress relieving generally not recommended --- **Technical Notes:** - UNS J94204 demonstrates superior carbon stability compared to lower-grade alloys - The high carbon content provides excellent resistance to sigma phase formation - Proper heat treatment is crucial for maximizing service life - Component design should consider thermal expansion characteristics This data is provided for informational purposes only. For critical applications, consult the relevant ASTM specifications and qualified metallurgical engineering resources. -:- For detailed product information, please contact sales. -: Cast Stainless Steel HK40, UNS J94204 Specification Dimensions Size： Diameter 20-1000 mm Length <4218 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. -: Cast Stainless Steel HK40, UNS J94204 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Flange HK40, UNS J94204 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Flange HK40, UNS J94204 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Flange HK40, UNS J94204 -:- 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 689 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