Butt-welding Pipe Fittings Cross ASTM A815 UNS S32101 ASME B16.9 Duplex Stainless Steel

Butt-welding Pipe Fittings Butt-welding Cross ASTM A815 UNS S32101 ASME B16.9 Duplex Stainless Steel

1. Product Description

This product is a butt-welding cross fitting manufactured in accordance with ASTM A815 and ASME B16.9 standards. The material is UNS S32101 (commonly known as LDX 2101), a lean duplex stainless steel. It features a dual-phase microstructure (approximately 50% ferrite and 50% austenite) that combines the high strength of ferritic steels with the toughness and corrosion resistance of austenitic steels.

2. Key Product Parameters

3. Application / Usage

This fitting is ideal for highly corrosive and high-pressure environments:

• Offshore oil and gas: Seawater injection systems, subsea pipelines, FPSO topside process piping

• Chemical processing: Chloride-containing process streams, acid services, heat exchangers

• Desalination plants: High-pressure RO membrane feed piping, evaporators

• Pulp and paper: Chlorine dioxide bleaching lines, digesters

• Wastewater treatment and storage tank systems

4. Advantages

• Superior Strength: Yield strength is 2.5 to 3 times higher than standard austenitic stainless steels like 304/316L, enabling thinner walls and lighter systems.

• Excellent Corrosion Resistance: High chromium and nitrogen content provides outstanding resistance to pitting and chloride stress-corrosion cracking.

• Cost-Effective: Lower nickel content compared to 300-series austenitic steels offers a cost-efficient alternative without compromising performance.

• Good Weldability and Machinability: Designed for ease of fabrication.

5. Functions

The butt-welding cross allows for the connection of four pipes at a single junction, creating multi-directional flow paths within the piping system. It enables one inlet with three outlets (or vice versa) and facilitates complex pipeline routing while maintaining high structural integrity.

6. Installation Instructions

1. Preparation: Cut the pipe ends squarely and remove all contaminants (oil, dirt, rust).

2. Alignment: Accurately align the cross with the connecting pipes using alignment tools to ensure even stress distribution.

3. Welding: Weld using qualified procedures (e.g., GTAW, FCAW) by certified welders. Post-weld surface treatment (pickling/passivation) is recommended to restore corrosion resistance.

4. Inspection: Perform non-destructive testing (NDT) such as radiographic or ultrasonic testing to verify weld integrity.

7. Precautions

• Ferrite Content: Ensure the ferrite content remains between 40–60% by volume. Improper heat treatment is a common cause of ferrite imbalance, which can reduce corrosion resistance.

• Solution Annealing: Mandatory heat treatment at 1020–1100°C followed by water quenching is required to maintain the duplex structure.

• Post-Weld Cleaning: To prevent pitting corrosion, chemically treat (pickle/passivate) the weld area after welding.

• Charpy Impact Testing: Required at -40°C (min 40 J average) for critical applications.

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 and prevent damage during transit.

11. After-Sales / Return & Warranty Policy

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

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

• Specific return, exchange, and warranty terms are subject to the final sales contract agreement.

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.