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Most people are unsure whether stainless steel is magnetic or a non-magnetic metal. According to their properties, some stainless steel varieties are magnetic while others aren’t. In simple terms, we can say metals that are attracted by magnets are magnetic metals, and those that aren’t attracted by magnets are non-magnetic metals. Magnetic stainless steel has more chromium and molybdenum, as well as Non-Magnetic steel has better corrosion resistance than the common magnetic grade. The stainless steel grade atoms are lined up in a crystal structure. Magnetic materials contain iron and come down to the microstructure of steel. And non-magnetic substances contain a high amount of austenitic. Both are widely used for industrial purposes.Now, let’s discuss in brief the comparison between magnetic and non-magnetic stainless steel and their types. We hope this blog will be useful for understanding the difference between magnetic and non-magnetic stainless steel.

The terms “austenitic” and “ferritic” refer to the crystalline structures. Austenitic (300 series) stainless steels, which are the most common, have an austenitic crystalline structure and are softer, ductile, and also nonmagnetic. Ferritic stainless steels, such as 430 and CB-30 grades, are harder, less ductile, and magnetic due to their predominately ferrite makeup.Although ASTM grade CF8M and AISI 316 are both austenitic stainless steels, AISI 316 is nonmagnetic because it is essentially austenite. Cast 316 or CF8M is slightly magnetic, however, because it is not entirely austenite and contains from 5 – 20 percent ferrite. By reducing or eliminating the quantity of ferrite in the chemical composition, wrought material manufacturers are able to make an alloy that is easier to roll into sheets or bars. Cast material manufacturers do not have the same requirements and therefore, can use a slightly harder alloy that contains ferrite.

Manufacturing welded tubing on a large scale is a complex process that involves several steps.Metal coil is first selected using a thickness that will later match the thickness of the finished tube wall. The coil must also be wide enough so that the desired circumference and diameter can be achieved.The coil is fed through a series of dies and formed to shape. This brings two edges of the coil width towards each other until a tube is formed with one edge touching the other.A welding process is used to join these two edges together.Depending on the welded tube manufacturing process, the excess weld reinforcement may be removed at this time. The newly formed tubing may also undergo a heat-treatment process depending on the desired specifications.The tube is then cut to the desired length.

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The advent of rolling mill technology and its development during the first half of the nineteenth century also heralded in the industrial manufacture of tube and pipe. Initially, rolled strips of sheet were formed into a circular cross section by funnel arrangements or rolls, and then butt or lap welded in the same heat (forge welding process).Toward the end of the century, various processes became available for the manufacture of seamless tube and pipe, with production volumes rapidly increasing over a relatively short period. In spite of the application of other welding processes, the ongoing development and further improvement of the seamless techniques led to welded tube being almost completely pushed out of the market, with the result that seamless tube and pipe dominated until the Second World War.During the subsequent period, the results of research into welding technology led to an upturn in the fortunes of the welded tube, with burgeoning development work ensuing and wide propagation of numerous tube welding processes. Currently, around two thirds of steel tube production in the world are accounted for by welding processes. Of this figure, however, about one quarter takes the form of so-called large-diameter line pipe in size ranges outside those which are economically viable in seamless tube and pipe manufacturing.

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