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

3. Application / Usage

This concentric reducer is ideal for demanding environments:

• Oil and Gas: Offshore platforms, subsea pipelines, processing equipment 

• Chemical Processing: Heat exchangers, pressure vessels, tanks 

• Desalination Plants: High-chloride environments, seawater systems 

• Pulp and Paper: Digesters, liquor tanks 

• Marine and Shipbuilding: High-corrosion marine applications 

4. Advantages

• Superior Strength: Yield strength is approximately double that of standard 300-series austenitic stainless steels , enabling thinner wall designs and weight savings.

• Excellent Corrosion Resistance: High chromium and molybdenum content provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride environments .

• Cost-Effective: Lower nickel content compared to austenitic grades offers material cost savings without compromising performance .

• 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

1. Preparation: Clean pipe ends and reducer weld areas of all contaminants.

2. Alignment: Accurately align the reducer with pipes using alignment tools to ensure concentricity.

3. Welding: Perform butt-welding following approved Welding Procedure Specification (WPS) with certified welders. For duplex materials, strict heat input control is essential.

4. 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

• Temperature Limitation: Not suitable for use above 300°C or below -50°C due to reduced toughness outside this range .

• Ferrite Balance: Ensure proper welding procedure to maintain the 50/50 austenite-ferrite microstructure .

• Annealing: Full solution annealing treatment is mandatory if embrittlement occurs during fabrication .

8. Shipping & Delivery

• Standard delivery time is typically 15–30 days, subject to order quantity and specification availability.

9. Payment Terms

• Common international payment methods include T/T (Telegraphic Transfer) and L/C at sight (Letter of Credit) .

10. Packaging

• 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

• All products undergo 100% strict quality inspection before shipment.

• In case of quality issues, retain original packaging and provide relevant photos or inspection reports.

• 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.