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
| Parameter | Details / Range |
|---|---|
| Design Standard | ASTM A815, ASME B16.9, MSS SP-43 |
| Material Grade | UNS S32101 (WPS32101) – Lean Duplex LDX 2101 |
| Product Form | Butt-welding Cross (Straight Cross / Reducing Cross) |
| Size Range | 1/2" – 48" (DN15 – DN1200) |
| Wall Thickness | SCH 5S to SCH XXS |
| Tensile Strength (min) | 696 MPa (101 ksi) |
| Yield Strength (min) | 450–530 MPa (65–77 ksi) |
| Elongation (min) | 30% |
| Hardness (max) | 290 HBW |
| PREN Value | ~26 (Pitting Resistance Equivalent Number) |
| Density | 7.69 g/cm³ |
3. Application / Usage
This fitting is ideal for highly corrosive and high-pressure environments:
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Offshore oil and gas: Seawater injection systems, subsea pipelines, FPSO topside process piping
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Chemical processing: Chloride-containing process streams, acid services, heat exchangers
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Desalination plants: High-pressure RO membrane feed piping, evaporators
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Pulp and paper: Chlorine dioxide bleaching lines, digesters
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Wastewater treatment and storage tank systems
4. Advantages
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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.
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Excellent Corrosion Resistance: High chromium and nitrogen content provides outstanding resistance to pitting and chloride stress-corrosion cracking.
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Cost-Effective: Lower nickel content compared to 300-series austenitic steels offers a cost-efficient alternative without compromising performance.
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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
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Preparation: Cut the pipe ends squarely and remove all contaminants (oil, dirt, rust).
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Alignment: Accurately align the cross with the connecting pipes using alignment tools to ensure even stress distribution.
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Welding: Weld using qualified procedures (e.g., GTAW, FCAW) by certified welders. Post-weld surface treatment (pickling/passivation) is recommended to restore corrosion resistance.
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Inspection: Perform non-destructive testing (NDT) such as radiographic or ultrasonic testing to verify weld integrity.
7. Precautions
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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.
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Solution Annealing: Mandatory heat treatment at 1020–1100°C followed by water quenching is required to maintain the duplex structure.
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Post-Weld Cleaning: To prevent pitting corrosion, chemically treat (pickle/passivate) the weld area after welding.
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Charpy Impact Testing: Required at -40°C (min 40 J average) for critical applications.
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 and prevent damage during transit.
11. After-Sales / Return & Warranty Policy
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All products undergo strict 100% quality inspection before shipment.
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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.
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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