Threaded Straight Tee ASTM A815 UNS S31803 Duplex Stainless Steel 3" SCH40 ASME B16.11
Threaded Straight Tee ASTM A815 UNS S31803 Duplex Stainless Steel 2" SCH40 ASME B16.11
1. Product Description
This product is a threaded straight tee manufactured from UNS S31803 (Duplex 2205) stainless steel in accordance with ASTM A815 and ASME B16.11 standards . A threaded straight tee is a three-way pipe fitting used to create perpendicular branch connections in small-bore threaded piping systems, with all three outlets having the same pipe size . UNS S31803 is a dual-phase stainless steel with a microstructure of approximately 50% ferrite and 50% austenite, offering roughly double the yield strength of standard 300-series austenitic stainless steels while providing excellent corrosion resistance . This 2" SCH40 fitting is designed for NPT threaded connections in demanding high-pressure applications.
2. Key Product Parameters
| Parameter | Details / Range |
|---|---|
| Material Standard | ASTM A815 / ASME SA815 |
| Dimensional Standard | ASME B16.11 |
| Material Grade | UNS S31803 (Duplex 2205 / F51 / WNR 1.4462) |
| Type | Threaded Straight Tee (Equal Tee) |
| Nominal Size | 2" (DN50) |
| Wall Thickness | Schedule 40 (SCH40) |
| Pressure Class | Class 3000# |
| Thread Type | NPT (ASME B1.20.1) |
| Chemical Composition (Cr/Ni/Mo/N) | 21.0-23.0% / 4.5-6.5% / 2.5-3.5% / 0.08-0.20% |
| Tensile Strength (min) | 620 MPa (90 ksi) |
| Yield Strength 0.2% (min) | 450 MPa (65 ksi) |
| Elongation (min) | 25% |
| Hardness (max) | 293 HBW |
| Density | ~7.8 g/cm³ |
| PREN Value | ~34–36 |
| Heat Treatment | Solution annealing at 1020-1100°C |
| Center-to-End (A) | 64 mm (for Class 3000#) |
| Band O.D. (H) | 84 mm (for Class 3000#) |
| Min Wall Thickness (G) | 7.14 mm (for Class 3000#) |
3. Application / Usage
This threaded straight tee is ideal for high-pressure and corrosive fluid systems requiring branch connections:
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Oil & Gas: Offshore platforms, wellhead connections, high-pressure process lines, gas processing
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Chemical Processing: Chloride-containing acids, brine services, specialty chemicals
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Marine Engineering: Seawater piping systems, desalination plants, shipbuilding
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Power Generation: Cooling water systems, condenser piping
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Pulp and Paper: Bleaching lines, digester systems
4. Advantages
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Superior Strength: Yield strength is approximately double that of 316L austenitic steel, enabling thinner wall designs
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Excellent Corrosion Resistance: PREN ~34-36 provides outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking
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Threaded Convenience: No welding required; fast installation and easiest disassembly for maintenance
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Cost-Effective: Lower nickel content compared to austenitic grades offers significant material cost savings
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Three-Way Flow Distribution: Straight tee design allows fluid division or combination in piping systems
5. Functions
The threaded straight tee connects three sections of pipe in a T-shaped configuration with all three ports of equal diameter (2"). It enables fluid to be divided from a single inlet into two branch outlets, or combined from two inlets into one outlet, providing a permanent, leak-proof junction point in small-bore piping systems .
6. Installation Instructions
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Preparation: Clean pipe threads and tee threads thoroughly; remove all dirt, oil, and debris
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Thread Sealant: Apply PTFE tape or pipe dope to male threads to ensure a reliable seal
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Thread Engagement: Screw the tee onto the branch pipe by hand, then tighten with a wrench to appropriate torque
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Avoid Over-tightening: Do not exceed recommended torque to prevent cracking the fitting body
7. Precautions
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Thread Compatibility: NPT, BSPT, and BSPP threads are not interchangeable. Verify thread type per system specification
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Temperature Limitation: Not recommended for use above 300°C or below -50°C due to reduced toughness
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Ferrite Balance: Ensure proper material specification to maintain the 50/50 austenite-ferrite microstructure
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Vibration Sensitivity: Threaded fittings are not recommended on lines subject to significant vibration, thermal shock, or hazardous fluid service
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Stress Concentration: Threading creates stress concentrators; verify suitability for specific service environment
8. Shipping & Delivery
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Standard delivery time is typically 15–30 days, subject to order quantity and specification availability.
9. Payment Terms
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Common international payment methods include T/T (Telegraphic Transfer) and L/C at sight (Letter of Credit) .
10. Packaging
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Products are securely packed in plywood cases or wooden crates with internal cushioning to ensure safe transportation and prevent damage during transit.
11. After-Sales / Return & Warranty Policy
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All products undergo strict quality inspection before shipment, with Mill Test Certificates (EN 10204 3.1/3.2) available .
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In case of quality issues, retain original packaging and provide relevant photos or third-party inspection reports.
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Specific return, exchange, and warranty terms are subject to the final sales contract agreement.
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FAQ
1. Are you trading company or manufacturer ?
We are manufacturer ,You can see the certification.
2. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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