Butt-welding Pipe Fittings Concentric Reducer ASTM A815 UNS S31803 2"Schedule 10 ASME B16.9 Duplex Stainless Steel
Butt-welding Pipe Fittings Concentric Reducer ASTM A815 UNS S31803 2"Schedule 10 ASME B16.9 Duplex Stainless Steel
1. Product Description
This product is a butt-welding concentric reducer manufactured in accordance with ASTM A815 and ASME B16.9 standards . The material is UNS S31803 (commonly known as Duplex 2205), a dual-phase stainless steel with roughly equal proportions of austenite and ferrite . This 2" Schedule 10 fitting is designed for butt-weld connection in piping systems requiring high strength and exceptional corrosion resistance.
2. Key Product Parameters
| Parameter | Details / Range |
|---|---|
| Design Standard | ASTM A815, ASME B16.9, MSS SP-43 |
| Material Grade | UNS S31803 (Duplex 2205 / WNR 1.4462) |
| Type | Concentric Reducer |
| Nominal Size | 2" (DN50) |
| Wall Thickness | Schedule 10 |
| End Connection | Butt-weld ends (beveled for welding) |
| Tensile Strength (min) | 620 MPa |
| Yield Strength (min) | 450 MPa |
| Elongation (min) | 25% |
| Hardness (max) | 293 HB / 31 HRC |
| Density | ~7.8 g/cm³ |
| PREN Value | ~34 (Pitting Resistance Equivalent Number) |
| Chemical Comp. (Cr/Ni/Mo/N) | 21.0-23.0% / 4.5-6.5% / 2.5-3.5% / 0.08-0.20% |
3. Application / Usage
This concentric reducer is ideal for demanding environments:
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Oil and Gas: Offshore platforms, subsea pipelines, processing equipment
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Chemical Processing: Heat exchangers, pressure vessels, tanks
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Desalination Plants: High-chloride environments, seawater systems
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Pulp and Paper: Digesters, liquor tanks
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Marine and Shipbuilding: High-corrosion marine applications
4. Advantages
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Superior Strength: Yield strength is approximately double that of standard 300-series austenitic stainless steels , enabling thinner wall designs and weight savings.
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Excellent Corrosion Resistance: High chromium and molybdenum content provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride environments .
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Cost-Effective: Lower nickel content compared to austenitic grades offers material cost savings without compromising performance .
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Good Fabricability: Combines fabrication ease of austenitic grades with strength of ferritic grades .
5. Functions
The concentric reducer connects pipes of different diameters on the same centerline, facilitating smooth transition from a larger bore to a smaller bore . It reduces turbulence and pressure drop while maintaining proper flow and ensuring efficient fluid transportation in piping systems
6. Installation Instructions
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Preparation: Clean pipe ends and reducer weld areas of all contaminants.
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Alignment: Accurately align the reducer with pipes using alignment tools to ensure concentricity.
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Welding: Perform butt-welding following approved Welding Procedure Specification (WPS) with certified welders. For duplex materials, strict heat input control is essential.
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Post-Weld Treatment: Solution annealing at 1020-1100°C followed by rapid cooling is required to restore the duplex structure and corrosion resistance . Pickling/passivation recommended.
7. Precautions
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Temperature Limitation: Not suitable for use above 300°C or below -50°C due to reduced toughness outside this range .
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Ferrite Balance: Ensure proper welding procedure to maintain the 50/50 austenite-ferrite microstructure .
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Annealing: Full solution annealing treatment is mandatory if embrittlement occurs during fabrication .
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 non-fumigation plywood cases or wooden crates with internal cushioning to ensure safe transportation.
11. After-Sales / Return & Warranty Policy
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All products undergo 100% strict quality inspection before shipment.
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In case of quality issues, retain original packaging and provide relevant photos or 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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