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 29MN Cast UNS J93372 Duplex Stainless Steel Flange Product Information
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MetalTek MTEK 29MN Cast UNS J93372 Duplex Stainless Steel Flange Synonyms
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MetalTek MTEK 29MN Cast UNS J93372 Duplex Stainless Steel Product Information
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**Product Name:** MetalTek MTEK 29MN Cast Duplex Stainless Steel (UNS J93372 / ASTM A890 Grade 6A)
**Introduction:**
MetalTek MTEK 29MN is a premium **nitrogen-enhanced super duplex stainless steel casting alloy**, representing an advanced evolution within the duplex casting family. As the designated upgrade to MTEK 29M, this alloy incorporates **higher, controlled nitrogen content** to significantly boost its **mechanical strength, localized corrosion resistance, and microstructural stability**. MTEK 29MN is engineered for the most severe service conditions where standard duplex castings may be marginal, offering performance that closely mirrors or exceeds that of wrought super duplex grades like UNS S32750, but in complex cast geometries.
**Key Features:**
* **Enhanced Strength & Hardness:** The deliberate nitrogen addition provides a substantial increase in yield and tensile strength, as well as hardness, offering superior resistance to mechanical wear, erosion, and galling.
* **Superior Localized Corrosion Resistance:** Achieves a higher Pitting Resistance Equivalent Number (PREN > 40), delivering exceptional resistance to pitting and crevice corrosion in high-chloride and sour environments.
* **Improved Structural Stability:** The optimized nitrogen content promotes a more stable and balanced austenite-ferrite microstructure, enhancing resistance to the formation of detrimental intermetallic phases during casting and heat treatment.
* **Robust Castability:** Maintains excellent foundry characteristics for producing sound, high-integrity castings in complex shapes via sand, investment, or centrifugal processes.
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**1. Chemical Composition (Typical Weight % - ASTM A890 6A)**
The composition is precisely controlled, with nitrogen as a key specified alloying element.
| Element | Content (%) | Element | Content (%) |
| :------------- | :------------ | :------------- | :---------- |
| Chromium (Cr) | 24.0 - 27.0 | Nickel (Ni) | 5.5 - 7.5 |
| Molybdenum (Mo)| 2.5 - 3.5 | **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 |
| **Iron (Fe)** | **Balance** | | |
**Key Alloying Note:** The **guaranteed, elevated nitrogen range (0.20-0.30%)** is the primary differentiator from MTEK 29M, driving its enhanced properties.
**PREN Calculation:** PREN = %Cr + 3.3(%Mo) + 16(%N) ≥ **40** (Typically **41-44**)
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**2. Physical & Mechanical Properties (Typical - Solution Annealed & Quenched)**
| Property | Value / Range |
| :-------------------------------------------- | :-------------------------------- |
| Density | 7.7 - 7.8 g/cm³ |
| Melting Range | ~1350 - 1420 °C |
| Modulus of Elasticity | ~200 GPa |
| **Tensile Strength (Rm)** | **795 - 930 MPa** |
| **Yield Strength (Rp0.2)** | **≥ 620 MPa** |
| **Elongation (A in 50mm)** | **≥ 15 %** |
| Hardness (Brinell) | 280 - 340 HBW |
| **Impact Toughness (Charpy V-notch)** | **≥ 54 J at -30°C** |
| **Critical Pitting Temperature (CPT)** | **Typically ≥ 60°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 Tubes, Pipes, and Rings**
* **Investment Castings (for complex, high-precision parts)**
* **Fully Machined and Finished Components**
**Primary Applications (Severe Service):**
MTEK 29MN is specified for critical components where failure is not an option:
* **Oil & Gas – Subsea & Sour Service:** Christmas tree and wellhead components, valve bodies and trim, choke valves, pump casings and impellers in HPHT (High-Pressure High-Temperature) and sour (H₂S) wells.
* **Chemical & Petrochemical:** Reactor cladding support rings, agitators, mixer shafts, and pump components for concentrated acids and chlorides.
* **Power Generation – Advanced FGD:** Fan wheels, damper shafts, absorber tower internals, and spray headers in highly corrosive flue gas cleaning systems.
* **Marine & Offshore:** Large seawater pump casings, propeller shaft sleeves, stern tubes, and high-load bearing components.
* **Pulp & Paper:** Impellers and casings for high-temperature, corrosive chemical circulation pumps.
* **Water Treatment:** High-pressure pump components for seawater reverse osmosis (SWRO) desalination plants.
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**4. International Standards & Approvals**
MTEK 29MN conforms to the nitrogen-enhanced grade within the cast duplex stainless steel standards.
| Standard Type | Standard Number & Designation | Notes |
| :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- |
| **Unified Numbering System (UNS)** | **J93372** | The standard UNS designation for this N-enhanced cast duplex alloy (CD3MWCuN). |
| **ASTM (USA)** | **ASTM A890/A890M** | **Grade 6A** is the specific grade designation for UNS J93372. This is the primary procurement standard. |
| | **ASTM A487** (Steel Castings Suitable for Pressure Service) - Can be supplied to Grade 6A requirements. | Commonly specified for pressure-containing parts. |
| **NACE MR0175/ISO 15156** | **Compliant (with strict heat treatment controls)** | Can be qualified for sour service. Requires solution annealing and verification of microstructure and hardness (typically ≤ 32 HRC). |
| **ASME Boiler & Pressure Vessel Code** | **Section II, Part A** - Can be approved under SA-351 (investment) or SA-487 (sand) specifications meeting Grade 6A requirements. | For pressure-retaining castings in ASME-stamped equipment. |
| **Key Procurement Specification** | **MetalTek MTEK 29MN Technical Datasheet** in conjunction with **ASTM A890 Grade 6A** or project-specific material specifications. | MetalTek's datasheet defines the proprietary foundry practice and guaranteed enhanced properties. |
**Critical Foundry & Fabrication Note:**
MTEK 29MN 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 temperature range (e.g., 1120-1160°C) followed by a rapid quench to achieve the correct phase balance and dissolve intermetallics. **Welding of castings should be minimized and is a critical operation.** 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 A890 Grade 6A (UNS J93372)** and require **certified heat treatment charts, chemical analysis, mechanical test reports, and often microstructure/ferrite content verification.**
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MetalTek MTEK 29MN Cast UNS J93372 Duplex Stainless Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <7280 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 29MN Cast UNS J93372 Duplex Stainless Steel Properties
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Applications of MetalTek MTEK 29MN Cast UNS J93372 Duplex Stainless Steel Flange
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Chemical Identifiers MetalTek MTEK 29MN Cast UNS J93372 Duplex Stainless Steel Flange
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Packing of MetalTek MTEK 29MN Cast UNS J93372 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 3751 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
