Stainless Steel 347 Welded Tube

Stainless Steel 347 Welded Tube Manufacturer, Supplier in India

Stainless steel 347 / 347H welded tubes possess distinctive characteristics that set them apart from other stainless steel tubes. One key difference is their enhanced resistance to intergranular corrosion, achieved by adding columbium (niobium) and tantalum. This resistance makes them particularly suitable for applications involving high temperatures, such as in the petrochemical and aerospace industries. Stainless steel 347 / 347H welded tubes exhibit excellent creep strength and thermal stability, making them highly reliable under prolonged exposure to elevated temperatures.

Another differentiating factor is their ability to withstand sensitization, which can occur during welding or exposure to certain temperatures, leading to a loss of corrosion resistance. However,Stainless steel 347 / 347H welded tubes have a balanced composition that resists sensitization, ensuring long-term durability in corrosive environments. The unique combination of intergranular corrosion resistance, high-temperature strength, and resistance to sensitization makes stainless steel 347 / 347H welded tubes a preferred choice for critical applications where reliability and performance are paramount.

What are the common industries and applications where stainless steel 347 / 347H welded tubes are used?

Stainless steel 347 / 347H welded tubesfind extensive usage in various industries and applications. They are commonly employed in the oil and gas sector, particularly in refineries and petrochemical plants, where they serve as vital components in processing equipment, heat exchangers, and pipelines. The aerospace industry also relies on Stainless steel 347 / 347H welded tubes due to their high-temperature strength and resistance to intergranular corrosion, making them suitable for aircraft exhaust systems and engine components.

Stainless steel 347 / 347H welded tubes are widely utilized across various industries and applications. They are commonly employed in the oil and gas sector, including refineries and petrochemical plants, where they serve as crucial components in processing equipment, heat exchangers, and pipelines. The power generation industry also relies on Stainless steel 347 / 347H welded tubes due to their excellent resistance to high temperatures and corrosion, making them suitable for power plants' boiler tubes, superheaters, and reheaters. Additionally, these tubes find usage in the pharmaceutical and chemical industries, where they are utilized in producing pharmaceutical equipment, chemical reactors, and storage tanks, thanks to their exceptional resistance to sensitization and durability.

Preparing The Sheets

Before being selected to roll, the stainless steel sheets go through a number of inspections. Trimming them around the edges is the first step in preparing them.

Rolling Through Rollers

The desired size is then achieved by running the sheets through many rollers. You can see the sheets evolving into tubular shapes in this stage.

Rollers Through The Fitted Welding Machine

The tubular shape must pass through a customised welding equipment in this step. You get precisely rolled tubes by removing the weld beads and scraps from inside these tubular shapes.

Welding Process

The grade and application requirements have an impact on tube welding and forming. For the manufacturing of tiny diameter tubes, we employ TIG welding. Steel sheets are coiled and welded inside of a welding machine. The steel sheets are shaped into a coil before entering the machine. The seam between these coils is then welded to create a tube.

Electric Resistance Welding (ERW) Process

Tube is made using the Electric Resistance Welding (ERW) technique, which involves cold-forming a flat sheet of steel into a cylindrical shape. The steel is then heated by applying current to either of the cylinder's edges, forcing the edges to bond together firmly without the use of welding filler material.

Submerged Arc Welding (SAW) Process

An arc is created between a workpiece and a continuously fed bare wire electrode during the Submerged Arc Welding (SAW) procedure. Additionally, flux is used to create slag, produce protective gases, and provide alloying materials to the weld pool. Gas shielding is not required.

Electric Flash Welding Process

A steel sheet being transformed into a cylinder using the electric flash welding process. The edges are heated until they become semi-molten in this instance, and then they are pressed together until molten steel is squeezed out of the junction and forms a bead.

Annealing

Metal is heated above the point of re-crystallization and cooled to room temperature during the annealing process. The molecular bonds in metal tighten when it is shaped, making it rigid. The metal is put through an annealing process to regain its ductility.

Sinking Process

Tube sinking is a drawing technique that reduces the diameter of tubes. In this drawing technique, a tube is run through a die without the need of a mandrel. Good inner surface quality is not ensured when using a mandrel. The die angel determines the integrity of the outer surface. The die being used produces a uniform surface. A tube can be significantly smaller than it was originally. When cost is a factor, tube sinking is ideal.

Inspection and Testing

Before sending our items to our consumers, we conduct inspection procedures to verify their integrity.