Introduction of the processing technology of s phase permeation layer on austenitic stainless steel plate

Many of the advantages of the 304 stainless steel plate, such as surface appearance, application forms, excellent corrosion resistance, long service life, high strength materials, so the use of the field of stainless steel sheet is very extensive, because there are good oxidation resistance, so the stainless steel plate can effectively fire resistant products. Stainless steel material is very easy to be machined at normal temperature. Because there is no need for surface treatment, stainless steel products are easy to use, easy to maintain, and the surface is bright and beautiful.

The most important difference between 316 and 304 stainless steel in chemical composition is that 316 stainless steel contains molybdenum alloy element, and it is generally believed that 316 stainless steel has better corrosion resistance. In high temperature, 304 stainless steel is also more resistant to corrosion. Therefore, in the high temperature operating environment, 316 stainless steel parts are usually used. However, if it is in a concentrated sulfuric acid working environment, even if the temperature is higher, it is absolutely not possible to use 316 stainless steel, because in order to avoid thread killing when exposed to high temperature, it is necessary to apply solid lubricant.

304 stainless steel, because the yield point of stainless steel itself is relatively high, and the hardness is also high, so the cold hardening effect is obvious. 304 stainless steel plates will have the following characteristics when doing bending processing.

The first is due to thermal conductivity is lower than the ordinary low carbon steel, low elongation, so the deformation force needed is relatively large, the bending process and springback tendency is very strong compared to the existence of carbon steel stainless steel sheet, stainless steel plate bending steel workpiece in bending angle is larger than that of carbon steel to have cracks. Because of the relatively high hardness of 304 stainless steel plate, cold hardening effect is obvious, so choose the tool steel heat treatment hardness greater than 60HRC in the choice of bending tool, the surface roughness than the bending tool steel is an order of magnitude higher.

Based on the above characteristics, usually in the unit size, the thick plate bending strength, the greater the need, and with the margin of plate thickness increase in the choice of bending equipment when the bending force is much higher, in size, higher tensile strength, the elongation rate is lower, the greater the need of bending force the bending angle is bigger also.

According to the actual situation, a bending workpiece is the sum of the right angle side unfold size minus two thickness, can fully meet the design requirements of precision, outspread quantity can simplify the calculation and greatly improve the production efficiency is calculated in accordance with the empirical formula, stainless steel material yield strength increases, elastic recovery amount is high, in order to obtain the bending part 90 degrees, need to press the knife angle to lower the design.

Compared with carbon steel, the 304 stainless steel plate with the same thickness has larger bending angle. This aspect needs special attention, otherwise there will be bending cracks, which will affect the strength of stainless steel plates.

Source: China Stainless Steel Plates Manufacturer - Yaang Pipe Industry Co., Limited (www.yaang.com)