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 SD100 Cast UNS J93380 Duplex Stainless Steel Flange Product Information
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MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Flange Synonyms
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MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Product Information
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# **Product Name: MetalTek MTEK SD100 Cast Super Duplex Stainless Steel (UNS J93380 / ASTM A890 Grade 7A)**
## **Introduction**
MetalTek MTEK SD100 (UNS J93380) is a premium **25% chromium super duplex stainless steel casting alloy**, engineered to deliver **ultimate corrosion resistance and mechanical performance** for the most demanding industrial applications. This alloy represents the highest standard within MetalTek's super duplex casting portfolio, offering **exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC)** in aggressive chloride-containing environments, including sour (H₂S) service. With a guaranteed Pitting Resistance Equivalent Number (PREN) > 40, MTEK SD100 is specifically designed for critical components where standard duplex and even other super duplex grades may approach their performance limits.
## **Key Features**
* **Extreme Corrosion Resistance:** Exceptional resistance to localized corrosion (pitting/crevice) and stress corrosion cracking, validated by a PREN typically > 42, making it suitable for the most severe chloride and acid exposures.
* **Very High Mechanical Strength:** Offers superior yield and tensile strength—approximately triple that of standard CF-8M (316) castings—enabling lightweight, high-pressure designs and excellent resistance to erosion and abrasion.
* **Optimized for Sour Service:** Formulated and processed to meet stringent NACE MR0175/ISO 15156 requirements for oil and gas components exposed to H₂S, with controlled microstructure and hardness.
* **Superior Structural Stability:** The balanced high-alloy composition, including nitrogen and often tungsten, ensures a stable austenite-ferrite microstructure that resists the formation of detrimental intermetallic phases during casting and heat treatment.
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## **1. Chemical Composition (Typical Weight % - ASTM A890 Grade 7A)**
The composition is precisely controlled to maximize both corrosion resistance and mechanical properties.
| Element | Content (%) | Element | Content (%) |
| :------------- | :------------ | :------------- | :---------- |
| Chromium (Cr) | 24.0 - 27.0 | Nickel (Ni) | 6.5 - 8.5 |
| 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** | | |
**Key Alloying Note:** The combination of **high nitrogen (0.20-0.30%) and tungsten (W)** is a hallmark of premium super duplex grades, significantly enhancing pitting resistance and structural stability.
**PREN Calculation:** PREN = %Cr + 3.3(%Mo + 0.5%W) + 16(%N) ≥ **40** (Typically **42-45**)
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## **2. Physical & Mechanical Properties (Typical - Solution Annealed & Quenched)**
| Property | Value / Range |
| :-------------------------------------------- | :-------------------------------- |
| Density | 7.8 g/cm³ |
| Melting Range | ~1340 - 1410 °C |
| Modulus of Elasticity | ~200 GPa |
| **Tensile Strength (Rm)** | **820 - 1000 MPa** |
| **Yield Strength (Rp0.2)** | **≥ 600 MPa** |
| **Elongation (A in 50mm)** | **≥ 15 %** |
| Hardness (Brinell) | 290 - 350 HBW |
| **Impact Toughness (Charpy V-notch)** | **≥ 54 J at -30°C** |
| **Critical Pitting Temperature (CPT) - ASTM G48** | **Typically ≥ 70°C** |
| **Critical Crevice Temperature (CCT) - ASTM G48** | **Typically ≥ 45°C** |
| Maximum Recommended Service Temperature | ~250°C |
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## **3. Product Forms & Applications**
**Available Product Forms:**
* **Heavy-Section Static Sand Castings**
* **Centrifugally Cast Pipes, Tubes, and Cylinders**
* **Investment Castings for Complex Geometries**
* **Fully Machined and Assembled Components**
**Primary Applications (Ultra-Severe Service):**
MTEK SD100 is specified for frontier applications where its unmatched performance is critical:
* **Oil & Gas – Ultra-Deepwater & HPHT:** Subsea Christmas tree bodies, manifolds, wellhead connectors, choke and kill valves, and high-pressure pump casings.
* **Oil & Gas – Severe Sour Service:** Components for fields with very high partial pressures of H₂S and CO₂, coupled with high chlorides.
* **Chemical & Petrochemical:** Reactor internals, agitators, and heat exchanger tubes for concentrated sulfuric and phosphoric acid service.
* **Marine & Offshore:** Critical seawater system components, such as pump volutes, impellers, and valve bodies for naval vessels and offshore platforms.
* **Power Generation – Advanced FGD:** Fan wheels, dampers, and mist eliminator components in the most corrosive zones of flue gas desulfurization systems.
* **Desalination:** High-pressure pump impellers, energy recovery device rotors, and RO membrane housings in seawater reverse osmosis plants.
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## **4. International Standards & Approvals**
MTEK SD100 aligns with the most stringent specifications for cast super duplex stainless steels.
| Standard Type | Standard Number & Designation | Notes |
| :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- |
| **Unified Numbering System (UNS)** | **J93380** | The common UNS designation for this grade of cast super duplex alloy. |
| **ASTM (USA)** | **ASTM A890/A890M** | **Grade 7A** is the specific premium grade designation for this tungsten-bearing, high-nitrogen super duplex alloy. |
| | **ASTM A995 Grade 5A** | Also a valid specification for similar tungsten-containing super duplex castings. |
| **NACE MR0175/ISO 15156** | **Fully Compliant** | Qualified for the most severe sour service conditions (e.g., Region 3). Requires stringent heat treatment and hardness control (typically ≤ 36 HRC). |
| **ASME Boiler & Pressure Vessel Code** | **Section II, Part A** - Can be supplied under **SA-351** (investment) or **SA-995** specifications meeting Grade 5A/7A requirements. | Approved for pressure-retaining applications. |
| **Key Procurement Specification** | **MetalTek MTEK SD100 Technical Datasheet** in strict conjunction with **ASTM A890 Grade 7A** or **ASTM A995 Grade 5A**. | The MetalTek datasheet defines the proprietary foundry controls and guaranteed enhanced properties. |
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## **Critical Foundry & Fabrication Note**
**MTEK SD100 is a high-integrity, premium casting alloy that demands expert metallurgical control throughout its lifecycle.**
1. **Heat Treatment is Paramount:** Castings **must** undergo a precise **solution annealing heat treatment** within a narrow high-temperature range (e.g., 1120-1170°C) followed by a rapid water quench. This is essential to achieve the correct ferrite-austenite balance (target 40-50% ferrite) and to dissolve harmful intermetallic phases (sigma, chi).
2. **Welding is a Critical Operation:** Repair or fabrication welding is **highly discouraged** on finished, heat-treated castings. If absolutely necessary, it must be performed using **highly over-matching filler metals**, such as nickel-based alloys (e.g., AWS ERNiCrMo-3/Alloy 625) or specific super duplex wires, under a qualified procedure with strict control over heat input and interpass temperature. **A full re-solution anneal and quench is mandatory after any welding** to restore corrosion resistance in the heat-affected zone.
3. **Procurement Requirements:** Specifications must explicitly call for **ASTM A890 Grade 7A (UNS J93380)** or **ASTM A995 Grade 5A**. The purchase order should require:
* Certified chemical analysis (including N and W).
* Certified mechanical test reports (tensile, impact).
* Certified heat treatment charts.
* Microstructure report confirming absence of deleterious phases and ferrite content.
* Optional but recommended: Results from corrosion tests (e.g., ASTM G48 Method A CPT).
**Selection of MTEK SD100 is justified for applications where the extreme environment dictates the need for the highest available corrosion resistance in a cast component, and where the total cost of failure far outweighs the premium material cost.**
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MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <7284 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 SD100 Cast UNS J93380 Duplex Stainless Steel Properties
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Applications of MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Flange
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Chemical Identifiers MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Flange
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Packing of MetalTek MTEK SD100 Cast UNS J93380 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 3755 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
