Defects of seamless steel pipe pickling
1) the diffusion rate of hydrogen in sulfuric acid solution is higher than that in hydrochloric acid solution.
2) With the increase of pickling temperature, the diffusion rate of hydrogen increases sharply, but with the increase of acid concentration, the diffusion rate of hydrogen does not increase much. Therefore, DIN2448 st52 Carbon Steel Seamless Steel Pipe is best not to pickle at low temperature and high temperature.
3) Seamless steel pipe inclusions in pickling, such as As, Sb, H2S and SO2, increase the diffusion rate of hydrogen atoms, that is, increase the possibility of hydrogen embrittlement.
4) the chemical composition of seamless steel pipe also affects the diffusion of hydrogen atoms. The measures to prevent hydrogen embrittlement are to operate according to the prescribed acid concentration and temperature, to shorten the pickling time as far as possible, and to add corrosion inhibitors on time and in quantity.
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