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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MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Flange Product Information
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MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Flange Synonyms
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MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Product Information
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**Product Name:** MetalTek MTEK 2507 Cast Duplex Stainless Steel (UNS J93404 / ASTM A995 Gr. 4A/5A)
**Introduction:**
MetalTek MTEK 2507 is a premium **cast super duplex stainless steel**, serving as the direct cast equivalent to the renowned wrought super duplex grade UNS S32750. It represents the pinnacle of corrosion resistance and mechanical strength within the standard cast duplex stainless steel family. Engineered with high chromium, molybdenum, and nitrogen content, MTEK 2507 delivers **exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC)** in the most aggressive environments, including high-chloride, acidic, and sour (H₂S) services. It is the material of choice for critical cast components where standard duplex alloys are at their performance limits.
**Key Features:**
* **Extreme Corrosion Resistance:** Offers outstanding resistance to localized corrosion and SCC, with a Pitting Resistance Equivalent Number (PREN) typically > 40, making it suitable for severe chloride exposures.
* **Very High Mechanical Strength:** Provides approximately double the yield strength of standard CF-8M (316) castings and significantly higher strength than cast 2205 duplex, enabling robust, lightweight designs for high-pressure applications.
* **Excellent Erosion-Corrosion Resistance:** The combination of high hardness and inherent corrosion resistance ensures superior performance in high-flow, slurry, and cavitating services.
* **Proven Sour Service Capability:** When properly heat-treated, it meets the stringent requirements for components in sour oil and gas environments.
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**1. Chemical Composition (Typical Weight % - ASTM A995)**
The composition is tightly controlled to achieve a balanced, high-performance austenite-ferrite microstructure.
| Element | Content (%) | Element | Content (%) |
| :------------- | :------------ | :------------- | :---------- |
| Chromium (Cr) | 24.0 - 27.0 | Nickel (Ni) | 6.0 - 8.0 |
| Molybdenum (Mo)| 3.0 - 4.0 | **Nitrogen (N)**| **0.20 - 0.30** |
| Manganese (Mn) | ≤ 1.5 | Copper (Cu) | ≤ 0.50 |
| Silicon (Si) | ≤ 1.00 | Carbon (C) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.035 | Sulfur (S) | ≤ 0.025 |
| Tungsten (W) | 0.50 - 1.00* | | |
| **Iron (Fe)** | **Balance** | | |
**\*Note:** Tungsten (W) is a key alloying element in many super duplex specifications, enhancing pitting resistance. Its inclusion may vary slightly by exact specification (e.g., ASTM A995 Grade 4A vs. 5A).
**PREN Calculation:** PREN = %Cr + 3.3(%Mo + 0.5%W) + 16(%N) ≥ **40** (Typically **41-45**)
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**2. Physical & Mechanical Properties (Typical - Solution Annealed & Quenched)**
| Property | Value / Range |
| :-------------------------------------------- | :-------------------------------- |
| Density | 7.8 g/cm³ |
| Melting Range | ~1350 - 1420 °C |
| Modulus of Elasticity | ~200 GPa |
| **Tensile Strength (Rm)** | **795 - 1000 MPa** |
| **Yield Strength (Rp0.2)** | **≥ 550 MPa** |
| **Elongation (A in 50mm)** | **≥ 15 %** |
| Hardness (Brinell) | 280 - 350 HBW |
| **Impact Toughness (Charpy V-notch)** | **≥ 60 J at -30°C** |
| **Critical Pitting Temperature (CPT) - ASTM G48** | **Typically ≥ 65°C** |
| Maximum Recommended Service Temperature | ~280°C |
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**3. Product Forms & Applications**
**Available Product Forms:**
* **Static and Shell Molded Sand Castings**
* **Centrifugally Cast Pipes, Tubes, and Rolls**
* **Investment Castings (for complex, high-precision parts)**
* **Fully Machined and Finished Components**
**Primary Applications (Severe Service):**
MTEK 2507 is specified for the most demanding applications where failure is not an option:
* **Oil & Gas – Subsea & Sour Service:** Christmas tree and wellhead components, valve bodies and trim (gate, seat), choke valves, pump casings and impellers in HPHT and aggressive sour wells.
* **Chemical & Petrochemical:** Reactor internals, agitators, mixer shafts, and pump components for concentrated acids, chlorides, and oxidizing media.
* **Power Generation – Advanced FGD:** Fan wheels, damper shafts, absorber tower internals, and spray headers in highly corrosive flue gas desulfurization systems.
* **Marine & Offshore:** Large seawater pump casings, propeller shaft sleeves, stern tubes, and valve bodies for exposed marine environments.
* **Desalination:** High-pressure pump impellers and diffusers in seawater reverse osmosis (SWRO) plants.
* **Pulp & Paper:** Impellers and casings for high-temperature, corrosive chemical circulation pumps.
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**4. International Standards & Approvals**
MTEK 2507 conforms to the highest-tier specifications for cast super duplex stainless steels.
| Standard Type | Standard Number & Designation | Notes |
| :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- |
| **Unified Numbering System (UNS)** | **J93404** | The standard UNS designation for cast super duplex (e.g., CD3MWCuN). |
| **ASTM (USA)** | **ASTM A995/A995M** (Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel for Pressure-Containing Parts) | **Grade 4A or 5A** are the typical procurement grades for this alloy composition. Grade 5A often includes W. |
| | **ASTM A890/A890M Grade 6A** | Also a common specification, similar to ASTM A995 Grade 4A/5A. |
| **NACE MR0175/ISO 15156** | **Compliant (with strict heat treatment controls)** | Qualified for sour service. Requires solution annealing and verification of microstructure and hardness (typically ≤ 36 HRC). |
| **ASME Boiler & Pressure Vessel Code** | **Section II, Part A** - Approved under SA-351 (investment) or SA-995 specifications. | For pressure-retaining castings in ASME-stamped equipment. |
| **Key Procurement Specification** | **MetalTek MTEK 2507 Technical Datasheet** in conjunction with **ASTM A995 Grade 4A/5A** or project-specific specifications. | MetalTek's datasheet defines the proprietary foundry practice and guaranteed properties. |
**Critical Foundry & Fabrication Note:**
MTEK 2507 is a **high-performance cast alloy requiring expert metallurgical control**. The **solution annealing heat treatment is absolutely critical** and must be performed within a precise, high-temperature range (e.g., 1120-1180°C) followed by a rapid water quench to achieve the correct phase balance and dissolve harmful intermetallic phases (sigma, chi). **Welding of castings is complex and should be minimized.** If required, it **must** use **highly over-matching super duplex (e.g., ER2594) or nickel-based (e.g., Alloy 625) filler metals**, followed by a **full re-solution anneal and quench**. Procurement must specify **ASTM A995 Grade 4A/5A (UNS J93404)** and require **certified heat treatment charts, chemical analysis, mechanical test reports, and microstructure/ferrite content verification (target 35-55%).**
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MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <7282 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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MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Properties
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Applications of MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Flange
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Chemical Identifiers MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Flange
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Packing of MetalTek MTEK 2507 Cast UNS J93404 Duplex Stainless Steel Flange
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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 3753 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
