line pipe

Stainless steel pipe now more and more widely used, due to its good corrosion resistance has played a vital role in engineering construction, in the process of production we need a solid solution for stainless steel tube processing, the main purpose x52 line pipe is to obtain certain martensite increase the hardness of products, let's look at the solution of the stainless steel tube processing:
(1) when the middle follow after solid solution treatment and then heated to 760 + 15 ℃, insulation 90 min, due to Cr23C6 carbide precipitation from austenite and reduce the carbon in the 904 l austenitic stainless steel pipe and alloy element content, Ms point by cooling to room temperature to 70 ℃ and then get martensite + alpha ferrite + residual austenite, the residual austenite in 510 ℃ ageing followed up.
(2) high temperature adjustment and cryogenic treatment solution first heated to 950 ℃ heat preservation after 90 min, due to the increased Ms points, cooling to room temperature to obtain a small amount of martensite; Then through - 70 ℃ after cold treatment insulation 8 h is a certain amount of martensite can be obtained.
(3) solid solution treatment after cold deformation method, cold deformation at room temperature, 904 l seamless tube formation during cold deformation martensite and the deformation and the number of element of 904 l stainless steel tube.
Stainless steel plate is a kind of corrosion products is not easy, unless it's some serious condition actually not impossible to achieve in any products from corrosion, if our stainless steel plate from corrosion are likely to affect the normal use of it, so in order to avoid this situation and we need to do some preventive measures, the following we first to get to know what are the factors from corrosion of stainless steel plate?
A) electrochemical corrosion
Stainless steel plate caused by contact with carbon steel cut, x56 line pipe and form a galvanic corrosion medium after it can produce electrochemical corrosion. Pickling passivation result is bad, also makes the plate surface passivation membrane uneven or too thin, it is easy to produce electrochemical corrosion, cut, easy to rust material such as splash slag adhesion on the board, and form a galvanic corrosion medium, resulting in electrochemical corrosion. Pickling passivation cleaning not clean in pickling passivation of the residual liquid and chemical corrosion products, and sheet forming after electrochemical corrosion.
2) chemical corrosion
Under certain conditions some attached on the surface of the stainless steel plate, x60 line pipe oil, dirt or later converted to acid, alkali, salt corrosion medium, react with some ingredients in plate, resulting in chemical corrosion caused by rust. Pickling passivation cleaning not clean enough to cause residual fluid collection, thereby directly sheet corrosion. Plate surface scratches, leading to the passivation film is destroyed, so that the protection ability of the sheet has been reduced, easy to react and chemical medium, chemical corrosion and rust.