ASTM A789 / A790 UNS S31803 / 2205 / 1.4462 Duplex Steel Welded Tube

UNS S31803 1.4462 Duplex Steel Welded Tube GTAW+PAW Welding

MTSCO — Your Trusted Partner in Industrial Piping

MTSCO specializes in supplying high-standard specialty piping for industrial fluid projects worldwide. To mitigate safety risks, large and medium-scale overseas engineering projects often impose extremely rigorous qualification thresholds for material suppliers.

Leveraging our 35 years of solid manufacturing expertise—particularly regarding high-end tubular materials such as Duplex Stainless Steel—we have proactively secured a suite of stringent international certifications, including ISO, PED, AD2000, and the demanding NORSOK M650 standard for the offshore sector. This enables us to directly assist you in rapidly clearing the material qualification reviews conducted by multinational project owners, thereby eliminating market entry barriers during project execution.

Specifications Of Duplex Steel Welded Tube

Single Process Introduction: GTAW + PAW Welding

Composite welding is a critical process for ensuring the quality of intergranular connections within the weld seams of Duplex Stainless Steel tubing. This technique combines the high energy density and deep penetration capabilities of Plasma Arc Welding (PAW) with the superior surface finish advantages of Gas Tungsten Arc Welding (GTAW), allowing for simultaneous double-sided weld formation. All Duplex Stainless Steel welded tubes supplied by MTSCO fully utilize this composite welding technology. This allows us to consistently control welding heat input within a safe range, ensuring the weld seams remain free from macroscopic defects—such as porosity or lack of fusion—thereby fundamentally guaranteeing the internal structural integrity of the piping within pressurized systems.

Packing Of Welded Tube

How Can We Avoid Minute Defects In The Tubes?

Online Eddy Current Testing is a non-destructive method used to detect surface and near-surface defects in precision welded tubes. Its operating principle relies on electromagnetic induction: as a tube passes through a test coil, the presence of any cracks or pores within the tube wall causes the internal induced currents (eddy currents) to generate anomalous electrical signals. By analyzing these signal fluctuations in real-time, a digital system can perform highly accurate, automated quality assessments.

Every Duplex Stainless Steel welded tube supplied by MTSCO undergoes 100% online eddy current testing directly on the production line. Our digital system continuously scans every inch of the weld seam, automatically triggering an alarm and isolating the tube if any signal deviation exceeds the permissible threshold. By relying on objective, non-destructive testing data, we comprehensively eliminate the risk of undetected defects, ensuring that the piping delivered to your project site possesses superior pressure-bearing integrity.

FAQ

Q1: Which major manufacturers supply the stainless steel strips (base material) you use?

A1: Our raw materials are sourced directly from the supply chains of top-tier manufacturers such as TSINGSHAN and Baosteel.

Q2: Given that multinational engineering projects in 2026 place a strong emphasis on low-carbon audits, what support can your new facility offer in this regard?

A2: The brand-new facility invested in by MTSCO is scheduled to officially commence production in the fourth quarter of 2026. Upon commissioning, this new plant will utilize photovoltaic clean energy; this initiative will not only boost our production capacity for high-standard welded tubes but also enable us to meet the rigorous compliance audit requirements of global engineering contractors regarding low-carbon and eco-friendly supply chains.

Q3: How are these precision welded tubes packaged, and what are the packaging standards?

A3: We strictly adhere to a standard protective packaging protocol: the ends of the welded tubes are fitted with protective caps, and each individual tube is wrapped in a plastic bag. Finally, the entire shipment is securely fastened and packed into sturdy plywood crates to ensure that the tubes remain in pristine condition throughout long-distance international transit and delivery.