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 29M Cast UNS J93370 Duplex Stainless Steel Flange Product Information
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MetalTek MTEK 29M Cast UNS J93370 Duplex Stainless Steel Flange Synonyms
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MetalTek MTEK 29M Cast UNS J93370 Duplex Stainless Steel Product Information
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**Product Name:** MetalTek MTEK 29M Cast Duplex Stainless Steel (UNS J93370 / ASTM A890 Grade 5A)
**Introduction:**
MetalTek MTEK 29M is a premium **cast duplex (austenitic-ferritic) stainless steel** alloy designed to provide an exceptional combination of **high strength, excellent corrosion resistance, and superior castability**. As a cast equivalent to wrought super duplex stainless steels, it is engineered for severe service environments where standard stainless steel castings are inadequate. MTEK 29M offers **outstanding resistance to chloride stress corrosion cracking (SCC), pitting, and crevice corrosion**, along with **excellent erosion-corrosion resistance**, making it ideal for demanding industrial, marine, and energy applications.
**Key Features:**
* **Superior Corrosion Resistance:** Provides excellent resistance to a broad range of corrosive media, including seawater, chlorides, acids, and caustics, with a Pitting Resistance Equivalent Number (PREN) typically > 40.
* **High Mechanical Strength:** Delivers significantly higher yield and tensile strength than standard austenitic stainless steel castings (e.g., CF-8M/316), allowing for more robust and reliable component design.
* **Excellent Erosion & Cavitation Resistance:** The inherent hardness and microstructural stability of the duplex matrix offer superior performance in high-flow, slurry, and cavitating service conditions.
* **Optimized for Casting:** Specifically formulated to provide good foundry characteristics, including fluidity and soundness, in complex investment, sand, and static castings.
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**1. Chemical Composition (Typical Weight % - ASTM A890 5A)**
The composition is balanced to ensure a stable, corrosion-resistant austenite-ferrite microstructure in the as-cast or heat-treated condition.
| Element | Content (%) | Element | Content (%) |
| :------------- | :------------ | :------------- | :---------- |
| Chromium (Cr) | 24.0 - 27.0 | Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo)| 2.0 - 3.0 | Nitrogen (N) | 0.10 - 0.25* |
| Manganese (Mn) | ≤ 1.5 | Copper (Cu) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.50 | Carbon (C) | ≤ 0.06 |
| Phosphorus (P) | ≤ 0.04 | Sulfur (S) | ≤ 0.03 |
| **Iron (Fe)** | **Balance** | | |
**\*Note:** Nitrogen content in cast alloys is typically achieved through precise control of melting atmosphere and charge materials, and is often reported as a typical value rather than a specified range in older standards. Modern heats are controlled to target the higher end for optimum properties.
**PREN Calculation:** PREN = %Cr + 3.3(%Mo) + 16(%N) > **38** (Typically ≥ 40)
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**2. Physical & Mechanical Properties (Typical - Heat Treated Condition)**
| Property | Value / Range |
| :-------------------------------------------- | :-------------------------------- |
| Density | 7.7 - 7.8 g/cm³ |
| Melting Range | ~1350 - 1430 °C |
| Modulus of Elasticity | ~200 GPa |
| **Tensile Strength (Rm)** | **760 - 895 MPa** |
| **Yield Strength (Rp0.2)** | **≥ 550 MPa** |
| **Elongation (A in 50mm)** | **≥ 15 %** |
| Hardness (Brinell) | 260 - 320 HBW |
| **Impact Toughness (Charpy V-notch)** | **≥ 60 J at -30°C** |
| Maximum Recommended Service Temperature | ~300°C (to avoid embrittlement) |
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**3. Product Forms & Applications**
**Available Product Forms:**
* **Static Sand Castings**
* **Centrifugally Cast Tubes and Cylinders**
* **Investment Castings (Precision Castings)**
* **Finished Machined Components**
**Primary Applications:**
MTEK 29M is specified for critical components in extremely aggressive environments:
* **Oil & Gas (Upstream & Midstream):** Subsea valve bodies, pump casings, impellers, choke and kill line components, wellhead parts in sour service.
* **Chemical & Petrochemical Processing:** Pump casings, valve bodies, mixer blades, and reactor internals handling chlorides, acids, and caustics.
* **Power Generation (FGD Systems):** Absorber tower nozzles, dampers, fan wheels, and spray headers in flue gas desulfurization units.
* **Marine & Offshore:** Seawater pump casings, impellers, valve bodies, propeller shafts, and stern tube seals.
* **Pulp & Paper:** Digester circulator pump components, black liquor strainer bodies.
* **Water & Wastewater:** High-pressure pump components for reverse osmosis (RO) and abrasive slurry services.
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**4. International Standards & Approvals**
As a cast product, MTEK 29M conforms to established ASTM standards for cast duplex stainless steels.
| Standard Type | Standard Number & Designation | Notes |
| :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- |
| **Unified Numbering System (UNS)** | **J93370** | The standard UNS designation for this cast duplex alloy. |
| **ASTM (USA)** | **ASTM A890/A890M** (Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application) | **Grade 5A** is the specific grade designation for CD3MN (UNS J93370) within this standard. |
| | **ASTM A487** (Steel Castings Suitable for Pressure Service) - Can be supplied to Grade 5A requirements. | Common for pressure-retaining castings. |
| **NACE MR0175/ISO 15156** | **Compliant (with proper heat treatment)** | Can be qualified for sour (H₂S) service, subject to specific heat treatment and maximum hardness requirements (typically ≤ 28 HRC). |
| **Other Approvals** | **ASME Boiler & Pressure Vessel Code, Section II, Part A** - SA-351 (for investment castings) or SA-487. | Approved for pressure-retaining applications. |
| **Key Procurement Specification** | **MetalTek MTEK 29M Technical Datasheet** alongside **ASTM A890 Grade 5A** or equivalent project specifications. | Defines MetalTek's specific foundry controls and guaranteed properties. |
**Critical Foundry & Fabrication Note:**
MTEK 29M is a **specialist cast alloy** requiring precise **foundry control** and **heat treatment**. Castings must undergo a **solution annealing heat treatment** (typically at 1120-1170°C followed by rapid quenching) to dissolve harmful intermetallic phases and achieve the correct 40-60% ferrite/austenite balance. **Post-cast welding is possible but requires extreme caution**, using over-alloyed super duplex (e.g., ER2594) or nickel-alloy (e.g., ENiCrMo-3) filler metals, followed by a full re-solution anneal and quench to restore corrosion resistance. Procurement specifications must explicitly require **ASTM A890 Grade 5A** compliance and **certified heat treatment records**.
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MetalTek MTEK 29M Cast UNS J93370 Duplex Stainless Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <7279 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 29M Cast UNS J93370 Duplex Stainless Steel Properties
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Applications of MetalTek MTEK 29M Cast UNS J93370 Duplex Stainless Steel Flange
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Chemical Identifiers MetalTek MTEK 29M Cast UNS J93370 Duplex Stainless Steel Flange
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Packing of MetalTek MTEK 29M Cast UNS J93370 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 3750 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
