AISI Grade 18Ni (250) Maraging 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 Grade 18Ni (250) Maraging Steel Flange, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours Product Information -:- For detailed product information, please contact sales. -: AISI Grade 18Ni (250) Maraging Steel Flange, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours Synonyms -:- For detailed product information, please contact sales. -:

AISI Grade 18Ni (250) Maraging Steel, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 18Ni (250) Maraging Steel Sheet** **Specified Condition:** 3.18 mm thick sheet, Solution Annealed at 815°C (1500°F) for 30 minutes, Air Cooled, then Aged at 455°C (850°F) for 3 hours. **Product Overview** This datasheet describes **AISI 18Ni (250) Maraging Steel** supplied as a **3.18 mm (0.125") thick sheet** that has undergone a complete and specified two-stage heat treatment cycle: solution annealing followed by a lower-temperature aging process. This specific aging parameter (455°C / 850°F) is often selected to optimize the balance between ultimate strength and fracture toughness or stress corrosion cracking resistance for thin-section components. The material is delivered in its final, ready-to-use aged condition, exhibiting the characteristic ultra-high strength, excellent dimensional stability, and good ductility of the Grade 250 class. **Material & Specified Heat Treatment** * **Grade:** 18% Nickel Maraging Steel, Grade 250 (Nominal Yield Strength: 250 ksi / 1725 MPa). * **Product Form:** Cold-rolled or hot-rolled **Sheet**, 3.18 mm (0.125") nominal thickness. * **Final Condition:** **Peak Aged via Modified Parameters.** The sheet has been processed per the exact customer specification: 1. **Solution Anneal:** **815°C (1500°F) for 30 minutes**, Air Cooled. This time is sufficient for full austenitization and homogenization of the thin section, resulting in a soft, low-carbon martensitic structure ideal for subsequent forming or machining. 2. **Age Hardening:** **455°C (850°F) for 3 hours**, Air Cooled. Aging at this slightly lower temperature (vs. the standard 480°C/900°F) typically results in: * A marginal reduction in peak yield strength (by approximately 3-7%). * A potentially significant improvement in fracture toughness (K_IC) and resistance to stress corrosion cracking (SCC). * Excellent property uniformity through the thin section. **Chemical Composition (Typical Weight %, per AMS 6514)** | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 17.0 - 19.0 | **Cobalt (Co)** | 7.0 - 8.5 | | **Molybdenum (Mo)**| 4.6 - 5.2 | **Titanium (Ti)** | 0.3 - 0.5 | | **Aluminum (Al)** | 0.05 - 0.15 | **Carbon (C)** | **≤ 0.03 max** | | **Manganese (Mn)**| ≤ 0.10 max | **Silicon (Si)** | ≤ 0.10 max | | **Sulfur (S)** | ≤ 0.010 max | **Phosphorus (P)** | ≤ 0.010 max | | **Boron (B)** | 0.003 (min) | **Zirconium (Zr)**| 0.01 - 0.02 | | **Calcium (Ca)** | 0.05 (max) | **Iron (Fe)** | Balance | **Physical & Mechanical Properties (After Specified Aging: 455°C/3hrs)** * **Density:** 8.0 g/cm³ (0.289 lb/in³) * **Melting Point:** ~ 1415°C (2580°F) * **Mechanical Properties (Typical for 3.18mm sheet, longitudinal):** * **Ultimate Tensile Strength (UTS):** **1670 - 1740 MPa (242 - 252 ksi)** * **Yield Strength (0.2% Offset):** **1640 - 1710 MPa (238 - 248 ksi)** * **Elongation (% in 50mm):** **10 - 14%** * **Hardness:** **46 - 50 HRC** * **Fracture Toughness (K_Ic):** **Very High, typically 90 - 120 MPa√m** (Benefit of lower-temperature aging). * **Modulus of Elasticity:** 185 GPa (27 x 10⁶ psi) * **Thermal Properties (at ~20°C):** * **Thermal Expansion Coefficient:** 10.2 x 10⁻⁶/K * **Thermal Conductivity:** ~ 20.0 W/m·K * **Key Characteristics of this Treatment:** * **Toughness-Optimized:** The primary rationale for the 455°C aging cycle is to maximize damage tolerance and resistance to crack propagation in thin, highly stressed structures. * **Uniform Properties:** The thin gauge ensures rapid and uniform heat treatment, minimizing gradients. **Key Characteristics & Advantages** 1. **Optimized Toughness-Strength Balance:** This specific aging treatment deliberately trades a small amount of peak strength for a substantial gain in fracture toughness, making it ideal for fatigue-critical and damage-tolerant designs. 2. **Minimal Distortion & High Stability:** The entire heat treatment (air cooling from both solution and aging temperatures) ensures exceptionally low residual stress and dimensional change, critical for precision sheet components. 3. **Ready for Use:** Supplied in the final aged condition, requiring no further heat treatment by the user. 4. **Excellent Machinability (in Annealed State):** Any required cutting or forming must be completed on material in the solution-annealed condition prior to this final aging. **Primary Applications** This specific product and heat treatment are chosen for demanding, thin-section applications where crack resistance is as important as pure strength: * **Aerospace & Defense:** Thin-walled pressure vessels, missile and rocket motor cases, helicopter rotor blades spars, lightweight armor plating components. * **High-Performance Sporting Equipment:** Critical components in professional cycling frames, aerospace-derived bicycles, and high-stress parts in racing sailboats. * **Precision Instruments & Optics:** Stable mounting plates and structural frames for sensitive measurement equipment where dimensional stability under load is critical. * **Medical Devices:** Components for surgical tools or imaging systems requiring high strength, non-magnetic properties, and reliability. * **Test Coupons & Prototypes:** For material characterization and design validation under toughness-driven criteria. **International & Industry Standards** * **AMS 6521:** *Aerospace Material Specification for Maraging Steel Bars, Forgings, and Rings...* (The primary governing spec for aged material; properties will be noted as non-standard due to the aging temperature). * **AMS 6514:** Specifies the solution-annealed condition prior to aging. * **ASTM A579 / A579M:** A key reference specification for the 18Ni (250) grade. * **Customer-Specific Heat Treat Specification:** This product is explicitly made to a customer-defined aging parameter (455°C/3hrs). Certification will reference this specific work order/requirement. * **UNS K92890:** Unified Numbering System designation. * **ISO 683-13:** International standard covering wrought maraging steels. **Disclaimer:** This material has been aged to parameters that differ from the standard industry peak-aging temperature. The mechanical properties reflect this specific **toughness-optimized** condition and are not directly comparable to those from a 480°C (900°F) aging cycle. The material is in its final heat-treated state and is **not weldable or formable**. Any post-delivery processing that involves heating above approximately 300°C (570°F) will alter the metallurgical structure and degrade properties. All application engineering must be based on the certified test report from the supplier for this specific lot and heat treatment. -:- For detailed product information, please contact sales. -: AISI Grade 18Ni (250) Maraging Steel, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours Specification Dimensions Size： Diameter 20-1000 mm Length <7326 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 Grade 18Ni (250) Maraging Steel, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Grade 18Ni (250) Maraging Steel Flange, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Grade 18Ni (250) Maraging Steel Flange, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours -:- For detailed product information, please contact sales. -:

Packing of AISI Grade 18Ni (250) Maraging Steel Flange, 3.18 mm thick sheet, solution annealed at 815°C (1500°F) for 30 minutes, air cooled, aged at 455°C (850°F) for 3 hours -:- 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 3797 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