ASTM A789 Super Duplex Steel S32750 Welded Coiled Tube Laser Welding

ASTM A789 Super Duplex Steel S32750 Welded Coiled Tube Laser Welding

Specifications

Company and Factory Introduction

As a leading supplier of industrial stainless steel piping systems, MTSCO has established a strong presence in global engineering and EPC projects through its “Factory Complexes” model. In 2024, MTSCO officially established its own production facility—Siri Tubing—dedicated to the manufacturing of high-strength stainless steel and nickel alloy welded coiled tubing. Currently, MTSCO & Siri Tubing have become reliable suppliers to international energy giants such as OXY, KOC, and ADNOC. From material selection to specialized packaging (wooden/steel pallets), MTSCO consistently adheres to the core principle of “SAFE,” delivering safe, advanced, dedicated, and efficient transportation solutions for the global energy industry.

Factory Advantages

1. Extreme Pressure Resistance: All tubes undergo 100% high-pressure testing before shipment. With a standard test pressure of 40 MPa and a maximum of 100 MPa (far exceeding the 7 MPa standard for seamless pipes), we guarantee absolute safety for extreme high-pressure environments.

2. Rigorous Quality Control & Traceability: Raw materials are 100% sourced from top mills like POSCO, Baosteel, and TSINGSHAN, undergoing secondary PMI and MTC verification. The entire production process is supervised and fully documented. We also support strict third-party inspections (SGS, TÜV, BV).

3. In-House Independent Laboratory: Our in-house facility performs comprehensive testing, including RT, chemical analysis, intergranular corrosion, tensile, hardness, and metallographic tests. All reports and physical samples are retained to ensure 100% lifecycle traceability.

4. Trusted by Global Energy Giants: As MTSCO’s manufacturing base, Siri Tubing is a stable supplier for top companies like OXY, KOC, and ADNOC. Driven by our S.I.R.I. philosophy (Safety, Ingenuity, Refinement, Innovation), our products have reliably served the oil & gas, geothermal, and shipbuilding sectors for over a decade.

Manufacturing Process Flow

The core manufacturing process for these welded coiled tubes typically includes strip welding, cold drawing, bright annealing, eddy current testing, and hydraulic/air tight testing, followed by precision coiling, marking, and final inspection as per project requirements. For small-diameter control line products, process stability directly impacts weld quality, dimensional consistency, and subsequent installation performance. MTSCO’s in-house facility, Siri Tubing, employs mature processes such as 100% laser welding, cold drawing, bright annealing, and plastic wrapping, making it suitable for the production of continuous-length control lines.

Single Process Introduction

For welded coiled tubing, laser welding is a critical step. Stable control of heat input during welding helps achieve more uniform weld bead formation and reduces dimensional fluctuations during subsequent processing. For flowline control projects requiring delivery of long-length coiled tubing, welding consistency directly impacts pressure testing and on-site installation performance. Siri Tubing employs a 100% laser welding process, making it suitable for control line products with high requirements for weld stability, coil length, and batch consistency.

Hydraulic and Air Tight Test

To verify product reliability under extreme pressure, the production laboratory performs rigorous hydraulic test/air tight test on every coil of finished coiled tubing. Test engineers first seal both ends of the tubing and use a high-pressure pump system to inject water or high-purity nitrogen into the tubing, gradually increasing the internal pressure to multiples of the design standard. During the specified pressure stabilization period, high-precision sensors monitor the pressure curve in real time to confirm that the tubing exhibits no deformation or leakage when simulating deep-sea high-pressure or downhole conditions.

FAQ

Q1: What is the maximum operating pressure of the coiled tubing?

A1: Our welded coiled tubing undergoes standard hydraulic testing at 5,000 PSI and can withstand a maximum test pressure of 15,000 PSI, meeting the requirements of the vast majority of high-pressure applications.

Q2: In which corrosive environments are welded coiled tubes suitable?

A2: Our duplex stainless steel (2205/2507) is suitable for harsh environments such as seawater desalination, chemical media, and chloride-containing environments. These materials offer excellent resistance to pitting corrosion and stress corrosion cracking. MTSCO can recommend the most cost-effective solution based on your specific application.

Q3: Can you produce encapsulated tubing?

A3: Yes, we specialize in producing coiled tubing with plastic coatings in various materials, including PVDF, FEP, and PA. The coating provides additional corrosion resistance and mechanical protection, making it suitable for applications such as downhole control lines and instrumentation conduits. MTSCO’s co-extrusion coating technology ensures uniform coating and strong adhesion, fully complying with oil and gas industry standards.