AISI 304 316 321 410 Stainless Steel Welded Pipes 2mm For Fitness And Medical Equipment

High Strength Aisi 304 316 321 410 Welded round Tube Stainless Steel Pipe For Fitness And Medical Equipment

Stainless Steel Pipes Introduction
Stainless steel tubing is one of the most versatile metal alloy materials used in manufacturing and fabrication. The two common types of tubing are seamless and welded. Choosing between welded vs. seamless tubing primarily depends on the application requirements of the product. In choosing between the two keep in mind that first the tubing must be compliant with your project specifications and that secondly, it must meet the conditions for which the tubing will ultimately be used.

Knowing that distinction can also help in determining which tubing is best for a given application, welded or seamless. The method of manufacturing welded and seamless tubing is evident in their names alone. Seamless tubes are as defined – they do not have a welded seam. The tubing is manufactured through an extrusion process where the tube is drawn from a solid stainless steel billet and extruded into a hollow form. The billets are first heated and then formed into oblong circular molds that are hollowed in a piercing mill. While hot, the molds are drawn through a mandrel rod and elongated. The mandrel milling process increases the molds length by twenty times to form a seamless tube shape. Tubing is further shaped through pilgering, a cold rolling process, or cold drawing.

Production process and characteristics of stainless steel seamless pipe:

Stainless steel seamless pipes are divided into hot-rolled, hot-extruded and cold-drawn (rolled) stainless steel seamless pipes according to the production process.
hot rolled
Hot-rolled stainless steel seamless pipes are generally produced on automatic rolling mills. After inspection and removal of surface defects, the solid tube blank is cut into required lengths, centered on the end face of the perforated end of the tube blank, then sent to a heating furnace for heating, and perforated on a punching machine. At the same time, the piercing continues to rotate and advance. Under the action of the roll and the plug, a cavity is gradually formed inside the tube blank, which is then sent to the automatic tube rolling mill to continue rolling. meet specifications. It is a relatively advanced method to produce hot-rolled seamless steel pipes with continuous pipe rolling mills.
hot extrusion
The hot extrusion method is to place the heated tube blank in a closed extrusion cylinder, and the perforated rod and the extrusion rod move together to extrude the extrusion part from the smaller die hole. This method can produce steel pipes with smaller diameters.
Cold drawn (rolled)
In order to obtain seamless pipes with smaller size and better quality, cold drawing (rolling) must be used. Cold drawing (rolling) is usually carried out on a two-roll mill, and the steel pipe is rolled in an annular pass composed of a variable-section circular hole groove and a stationary conical head. Cold drawing is usually carried out on a single-chain or double-chain cold drawing machine of 0.5 to 100T.
Hot rolling is relative to cold rolling, cold rolling is rolling below the recrystallization temperature, and hot rolling is rolling above the recrystallization temperature. Hot rolling can damage the forging structure of the ingot, refine the grains of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent. The bubbles, cracks and porosity formed during casting can also be welded under the action of high temperature and pressure.
Cold drawn (rolled) stainless steel seamless pipe has high production efficiency, short production cycle, uniform wall thickness, good surface quality, high yield and low production cost. However, due to the reason of only one annealing, the tube is prone to cracks, and some deep processing such as bending cannot be carried out. Moreover, the production range of rolled tubes is limited, and the general production is ￠25mm-168mm

Stainless Steel Pipes Parameter