Cast Stainless Steel Flange HK40, ASTM A608

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, ASTM A608 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Flange HK40, ASTM A608 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel HK40, ASTM A608 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Data Sheet: Cast Stainless Steel HK40 (ASTM A608 Grade HK40)** **Product Overview** ASTM A608 Grade HK40 is a high-carbon, austenitic heat-resistant steel specification for centrifugal castings intended for high-temperature service. The "HK" designation represents the 25% chromium - 20% nickel alloy family, while "40" indicates the nominal 0.40% carbon content. This specification covers requirements for centrifugally cast steel tubes, pipes, and cylinders that must withstand extreme temperatures, pressure, and corrosive environments, making it the premier choice for reformer tubes, radiant tubes, and other critical high-temperature applications. --- #### **1. International Standards & Designations** ASTM A608 HK40 is recognized under various international standards: | Standard Organization | Designation | | :--- | :--- | | **ASTM International** | **A608 Grade HK40** | | **UNS (Unified Numbering System)** | **J94204** | | **ACI/SFSA (USA)** | **HK-40** | | **European Norm (EN)** | 1.4848 | | **German (DIN)** | G-X 40 CrNiSi 25-12 | | **Japanese (JIS)** | SCH 22 | --- #### **2. Chemical Composition (Weight % per ASTM A608)** The chemical composition is strictly controlled to ensure optimal 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)** | 2.00 max | | **Manganese (Mn)** | 2.00 max | | **Phosphorus (P)** | 0.04 max | | **Sulfur (S)** | 0.04 max | | **Iron (Fe)** | Balance | **Key Composition Features:** - **Elevated Carbon**: Provides superior creep and rupture strength through solid solution strengthening - **High Chromium**: Ensures exceptional oxidation and carburization resistance - **Nickel Content**: Maintains austenitic structure stability under thermal cycling --- #### **3. Typical Physical & Mechanical Properties** **Physical Properties:** - **Density**: 7.78 g/cm³ (0.281 lb/in³) - **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**: 16.5 × 10⁻⁶ /K (20-540°C) - **Modulus of Elasticity**: 200 GPa at 20°C **Mechanical Properties (Per ASTM A608):** - **Tensile Strength**: 485 MPa (70 ksi) minimum - **Yield Strength (0.2% Offset)**: 240 MPa (35 ksi) minimum - **Elongation**: 8.0% minimum in 2 inches - **Hardness**: 170-240 HB **High-Temperature Performance:** - **Maximum Service Temperature**: 1150°C (2100°F) - **Creep Strength**: Excellent long-term load-bearing capability - **Oxidation Resistance**: Superior performance in oxidizing atmospheres - **Carburization Resistance**: Good resistance to carbon penetration --- #### **4. Product Applications** ASTM A608 HK40 is specifically designed for centrifugally cast tubular products in severe service environments: **Petrochemical Industry:** - Steam methane reformer tubes - Ethylene cracking furnace tubes - Pyrolysis heater tubes - Reformer outlet headers and pigtails **Heat Processing Equipment:** - Radiant tubes for heat treatment furnaces - Carburizing retorts and muffles - Annealing furnace tubes - Roller hearth furnace components **Power Generation:** - Waste heat boiler components - Biomass energy conversion systems - High-temperature piping systems --- #### **5. Manufacturing & Fabrication** **Casting Process:** - Produced by centrifugal casting method - Creates seamless, uniform wall thickness tubes - Excellent dimensional control and surface finish **Heat Treatment Requirements:** - Solution annealing temperature: 1150°C (2100°F) minimum - Rapid cooling to prevent carbide precipitation - Heat treatment is mandatory per ASTM A608 **Machining Characteristics:** - Difficult to machine due to work hardening - Requires carbide tooling and rigid setups - Slow speeds with heavy feeds recommended **Welding Considerations:** - Weldable using SMAW and GTAW processes - Matching filler metals (ENiCrFe-3 type) required - Post-weld heat treatment essential --- #### **6. Quality Assurance** ASTM A608 mandates: - Chemical analysis for each heat - Tensile testing from each lot - Hydrostatic or non-destructive testing - Microstructural examination - Dimensional verification --- **Technical Notes:** - ASTM A608 HK40 offers superior creep strength compared to lower-carbon grades - The centrifugal casting process provides enhanced metallurgical integrity - Proper heat treatment is critical for maximizing service life - Regular microstructural analysis recommended during service *This information is for reference purposes. For complete requirements, consult the latest ASTM A608 specification and qualified metallurgical engineering resources.* -:- For detailed product information, please contact sales. -: Cast Stainless Steel HK40, ASTM A608 Specification Dimensions Size： Diameter 20-1000 mm Length <4219 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, ASTM A608 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Flange HK40, ASTM A608 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Flange HK40, ASTM A608 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Flange HK40, ASTM A608 -:- 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 690 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