Stainless steel plate is used more in our life, and its processing industry is also more diverse, mainly including cold rolling, calcined and hot rolling, etc. Today, we will introduce the calcined stainless steel plate process:

What is die forging ?

For socket welding and thread of three, four, elbow and other small size pipe fittings its shape is more complex, can use die forging molding process. The material used in this process should be rolled profiles. If stainless steel plate is used as the raw material, the rolled profiles of steel ingot should be prepared first. The blank is put into the mold after heating, and the pressure makes the metal flow and fill the mold cavity; After die forging, if the blank has a flying edge, it must go through the steps of flushing the flying edge remaining material to complete the die forging work.

What is free forging ?

For pipe fittings of special shape or stainless steel plate not suitable for die forging, the free forging process can be used for manufacturing, and the general shape of pipe fittings should be forged by free forging.

What is cutting ?

For some of the shape of tubular stainless steel plate can be directly cut by rod or thick wall tube forming, processing when the fiber flow of metal materials should be roughly parallel to the axial direction of stainless steel, for three, four, elbow type shall not use rod direct cutting forming.

The above introduction is about the stainless steel plate calaination process, different production processes use different methods.

The following introduces the factors of steel plate corrosion

Electrochemical corrosion

Stainless steel plate due to scratches caused by contact with carbon steel parts, and then the formation of galvanic cells with corrosive media, which will produce electro chemical corrosion. If the passivation effect of pickling is not good, the passivation film on the surface of the plate will be uneven or too thin, so it is easy to produce electrochemical corrosion, slag cutting, splashing and other rusting substances attached to the plate, and then form a galvanic cell with the corrosive medium, resulting in electrochemical corrosion. Pickling passivation cleaning is not clean, resulting in the remaining pickling passivation residual liquid and plate chemical corrosion products, and then the formation of electrochemical corrosion with the plate.

Chemical corrosion

Under certain conditions, many attached to the surface of the stainless steel plate oil, dust or acid, alkali, salt and other converted into corrosion medium, and some of the components in the plate chemical reaction, resulting in chemical corrosion and rust. Cleaning pickling passivation is not clean enough to cause residual liquid retention, which directly corroded the plate. The surface of the plate is scratched, which leads to the destruction of the passivation film, so that the protection ability of the plate is reduced, and it is easy to react with the chemical medium, chemical corrosion and rust.