The different techniques of stainless steel tubing include:

Tube Mill Process.This process has operations such as:

Rolling and Welding
With rolling and welding, stainless steel coils are continuously roll formed on a tube mill. The strip edges are welded together using welding techniques such as TIG, high frequency, and laser. Depending on the welding method, the strip edges may have to be prepared to yield a high quality weld. As part of the finishing process, weld beads on the ID and OD of the tube are removed with scarfing, sanding, bead rolling or other means depending on the final application and specification of how the tube is to be made.

Cleaning and Heating
The rolled stainless steel tubes produced in this manner are trimmed to the desired lengths based on industry demand. The stainless pipes and tubes are then cleaned to remove the dirt. These rolled tubes are then heat treated to reduce any stress that may have occurred during the welding and forming procedures. The continuously rolling hearth furnace is used for heat treatment. Temperature controllers and recorders are installed in the furnace. Following the heat treatment procedure, the stainless steel tubing and pipes are straightened and pickled to remove surface scales.

Cold Drawing
In some circumstances, the appropriate size may not be available directly from the mill. The cold operation procedure can then be employed to get the appropriate size. The tubes or pipes are covered with soap and oxalic solution during the cold drawing process. This solution provides lubrication, reducing friction during the cold drawing process. The tube or pipe is dragged over the bench utilizing Die plugs during the cold drawing operation.

Finishing Process
Next, the drawn-out tube or stainless steel pipe is cleaned, heat treated, pickled, and straightened. The final pipes or tubes are marked using computerized ink jet marking equipment. Before being sent on to stainless steel pipe exporters, the pipe or tube is labeled with the grade of material, heat number, size, and the stamp of a third party inspection. The resulting stainless tubes or pipes will be subjected to rigorous testing and quality control. This is followed by appropriate packing and shipping. There are several stainless steel pipe applications for which these pipes and tubes are employed.

Seamless Extrusion
Extrusion, gun drilling, and piercing are common ways of producing seamless stainless steel tubing. The extrusion method, on the other hand, produces the most consistent exterior diameter and, as a result, the most concentric internal diameter. Furthermore, extrusion is the only procedure that is best suited for long length seamless SS coil tubing. The basic material starts as a hot extruded seamless pipe.
After that, the material is cold. At this point, the raw material is processed in a long straight form by tube reducers known as pilger mills. Because cold pilgering is a longitudinal cold-rolling process that reduces the wall thickness and diameter of steel tubes in one operation. It may retain consistent outside diameters and concentric inside diameters. This method yields cross-section reductions of more than 90% in a single working cycle for selected material types.
When decreasing the tube, lubricants are applied on the outside diameter and inside diameter, which are subsequently degreased in annealing preparations. After reduction, this method typically yields lengths ranging from 40 to 160 feet. When producing long lengths of seamless tubing to be processed in coil form, cold reduction is the most efficient approach.

Coiling Tube
On specially developed machinery, a straight length of tube is cold drawn in coil shape. Because cold drawing reduces the outside diameter, inside diameter, and wall thickness, the tube lengthens as the product is drawn.

Main Drawing
Floating plug drawing is pulling tubing through a conical die and inserting a floating plug into the inside diameter. The final inside diameter and wall thickness are determined by the size of the die and plug. Floating plug drawing produces a more uniform, smoother finish, although it is only suitable for light wall items.
Sink drawing is the process of pulling tubing through a conical die and determining the resulting inside diameter and wall thickness based on the drawing and tubing specifications. Sink drawing is used for high-pressure applications that demand a large relative wall thickness. Compared to floating plug drawing, the inside diameter is often a little rougher.
Lubricants are applied to the outside diameter and inside diameter of tube coils to aid in the drawing process. The lubricant is degreased from the tube for most end-use applications (medicinal, liquid transfer, etc.). In a large solvent degreasing tank, this is achieved in a single process.

Vacuum Annealing
After cold reduction, long straight lengths of stainless steel tubing and coils are annealed to reduce internal tensions and restore the material's crystalline structure, allowing for further cold working. The annealing process's fast cooling turns cold-worked, hard, and brittle material back into soft and ductile material.

Hydrotest Tubing
This sort of tubing should be made in accordance with appropriate ASTM standards and thoroughly checked for potential flaws before being shipped to the client.
The tube is hydrostatically tested to guarantee integrity after it has been entirely formed to the desired specification. Hydrostatic testing is used to assess and confirm that the tubing satisfies the specifications. This verification method might yield a variety of facts. The hydrotest procedure can identify critical inspection data, such as.

Mechanical properties Material flaws
Specific hard spots which may fail when in the presence of hydrogen

Finishing Stainless Steel Tubing
Stainless steel coil tubing can be evenly wound on spools for shipping or straightened and cut to customer-specified lengths. For traceability and manufacturer identification, products might be polished and stenciled with relevant information.