The austenite type is non-magnetic or weakly magnetic, and martensite or ferrite is a kind of magnetic. Commonly used stainless steel tubes are mainly austenitic decorative tube sheets, which are generally non-magnetic or weakly magnetic, but the chemical composition may be caused by fluctuations in different magnetic states of smelting or processing, but this cannot be considered as counterfeit or unqualified. ,What is the reason?
A small amount of martensite or ferritic austenitic stainless steel tube is caused by segregation or improper heat treatment during smelting. In this way, the stainless steel tube will work with a weak magnetic field.
　
In addition, the 304 stainless steel tube is cold-worked, and the microstructure is also transformed into martensite. The greater the degree of cold work deformation, the more martensite transformation and the greater the magnetic properties of the steel. Like a batch of steel strips, it produces Φ76 tubes with no obvious magnetic induction and produces Φ9.5 tubes. Due to the large deformation of the bending, the magnetic induction is obvious. The rectangular tube produced is larger than the round tube, especially the angled part, and the deformation is more intense and the magnetic is more obvious. The reason why the magnetic properties of 304 steel is completely eliminated can be opened by high temperature solution treatment to restore stable austenite structure, thereby eliminating magnetism.
So how does the 304 stainless steel tube reduce corrosion resistance?
304 stainless steel tube is a kind of corrosion resistance of high alloy steel against air or chemical corrosive medium. It has beautiful surface and good corrosion resistance. It is not subjected to surface treatment such as plating and exerts the surface properties inherent in stainless steel. Many aspects of steel.
From a metallographic point of view, because the stainless steel formed on the surface of the film contains chromium and chromium films, the effects of separation of oxygen corrosion on the attack and steel. In order to maintain the inherent corrosion resistance of the 304 stainless steel tube, it must contain at least 12% chromium stainless steel. 304 is a versatile stainless steel that is widely used to make equipment and components that require good overall performance (corrosion resistance and formability). 304 stainless steel is a batch of stainless steel produced in accordance with American ASTM standards. Stainless steel plate, smooth surface with high plasticity, toughness and mechanical strength, corrosion resistance, alkaline gases, solutions and other media. It is an alloy steel that is not easily rusted, but is not absolutely rust-free.
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