According to different production methods, they can be classified into hot-rolled tubes, cold-rolled tubes, cold-drawn tubes, extruded tubes, etc.

　　1.1Hot-rolled stainless steel seamless tubes are generally produced on automatic tube rolling lines. Solid tube blanks are inspected and surface defects are removed. They are cut to the required length, centered on the end face of the perforated end of the tube blank, and then sent to the heating furnace for heating and perforated on the perforating machine. While perforating, it continuously rotates and moves forward. Under the action of the rolls and the head, a cavity gradually forms inside the tube blank, which is called a rough tube. It is then sent to the automatic pipe rolling mill for further rolling. Finally, the wall thickness is homogenized by the homogenizing machine and the diameter is determined by the sizing machine to meet the specification requirements. The production of hot-rolled seamless steel pipes using continuous pipe rolling units is a relatively advanced method.

　　1.2If seamless tubes with smaller dimensions and better quality are to be obtained, cold rolling, cold drawing or a combination of both methods must be adopted. Cold rolling is usually carried out on a two-roll mill, where steel pipes are rolled in a ring-shaped hole form composed of a variable cross-section circular hole groove and a stationary conical top. Cold drawing is usually in0.5～100TIt is carried out on a single-chain or double-chain cold drawing machine.

　　1.3The extrusion method involves placing the heated tube blank in a sealed extrusion cylinder. The piercing rod and the extrusion rod move together, causing the extruded part to be extruded through a smaller die hole. This method can produce steel pipes with smaller diameters.

　　This type of steel pipe can be divided into two major categories: stainless steel seamless steel pipes and stainless steel welded steel pipes (seam pipes), which can be classified according to different manufacturing processes

　　There are several basic types: hot rolling, extrusion, cold drawing and cold rolling. According to the cross-sectional shape, they can be further divided into round pipes and special-shaped pipes. The most widely used are round steel pipes, but there are also some square, rectangular, semi-circular, hexagonal, equilateral triangular, octagonal and other special-shaped stainless steel pipes.

　　All steel pipes subject to fluid pressure must undergo hydraulic tests to verify their pressure resistance and quality. They are considered qualified if no leakage, wetting or expansion occurs under the specified pressure. Some steel pipes also need to undergo crimping tests, flaring tests and flattening tests in accordance with standards or the requirements of the buyer.

　　Seamless stainless steel tubes, also known as stainless steel seamless tubes, are made from steel ingots or solid tube billets through piercing to form rough tubes, and then processed by hot rolling, cold rolling or cold drawing. The specification of seamless steel pipes is based on the outer diameter*Wall thickness is expressed in millimeters.

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