MetalTek,MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Rod/Bar

MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Rod Product Information -:- For detailed product information, please contact sales. -: MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Product Information -:- For detailed product information, please contact sales. -: # **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. --- ## **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**) --- ## **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 | --- ## **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. --- ## **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. | --- ## **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.** -:- For detailed product information, please contact sales. -: 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 -:- For detailed product information, please contact sales. -: MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Properties -:- For detailed product information, please contact sales. -:

Applications of MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Rod -:- For detailed product information, please contact sales. -:

Packing of MetalTek MTEK SD100 Cast UNS J93380 Duplex Stainless Steel Rod -:- 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 Rod 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