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Precautions for stainless steel thick plate processing

Precautions for stainless steel thick plate processing

The stainless steel thick plate has a smooth surface, high plasticity, toughness and mechanical strength, and is resistant to acid, alkaline gas and solution corrosion. The following briefly introduces the precautions for stainless steel thick plate processing.

1. The processing of stainless steel thick plates is very important in the field of construction processing applications for many reasons. The corrosive environment requires a smooth surface because it is not easy to scale. The deposit of dirt will cause stainless steel to rust and even cause corrosion. In the spacious hall, thick stainless steel plates are commonly used materials for elevator decorative panels. Health is important to many industries. In these applications, the surface of thick stainless steel plates must be easy to clean every day, and chemical cleaners are often used for cleaning.

2. Stainless steel is processed into alloy materials with different crystal phases and changes accordingly. Therefore, during the processing of stainless steel thick plates, due to the influence of temperature, new phases are likely to be locally precipitated (locally equal), and the physical and chemical state of the inter-grain boundary substances is different from the grains themselves, resulting in a significantly higher corrosion rate at the grain boundaries. The grain itself (intergranular corrosion). The precipitation of these new phases leads to the formation of poor areas of some elements.

3. The processing points of stainless steel thick plates: due to the influence of processing temperature, internal stress is likely to occur, and a large amount of chloride ions aggravate stress corrosion. During plasma cutting, the excessively high local temperature causes the austenitic stainless steel grains to be coarse, or even partially melted, and the internal stress is too high, especially stress corrosion. In the greenhouse polishing process, although adjusting the slurry formula can reduce corrosion, stress corrosion and intergranular corrosion cannot be avoided.

In order to control intergranular corrosion and stress corrosion, it is necessary to start with the processing technology, cutting method and heat treatment temperature of stainless steel thick plate equipment to avoid crystallization and internal stress concentration. During the polishing process, it was found that the welds and heat-treated parts were corroded, especially the plasma cutting surface produced severe corrosion, which increased with time.