Shorten pickling time as much as possible; Secondly, add corrosion inhibitor to reduce hydrogen production.
Hydrogen embrittlement (or hydrogen damage) of P11 alloy steel pipe refers to the cracking or delayed brittle failure of P11 alloy steel pipe caused by the erosion of its wall by hydrogen. The damage of high temperature and high pressure hydrogen to P11 alloy steel pipe is mainly because hydrogen infiltrates into the metal in the atomic state, and then binds into molecules inside P11 alloy steel pipe, resulting in high pressure, which may cause surface bulge or wrinkle. Hydrogen combines with carbon in steel to decarbonate steel, or to reduce sulfide and oxide in P11 alloy steel pipe.
Hydrogen under atmospheric pressure will have obvious corrosion of P11 alloy steel pipe, but when the temperature exceeds 300℃ and the pressure is higher than 30 mpa, can produce hydrogen embrittlement the corrosion defects, especially under the condition of high temperature. Such as desulphurization tower, conversion tower, ammonia synthesis tower in the process of ammonia production; Some hydrogenation devices in the process of oil refining; Methanol synthesis tower in petrochemical production process.
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