Steel used in wet hydrogen sulfide environment and its manufacture;

The types of hydrogen damages of materials in refinery wet hydrogen sulfide environment and corrosion mechanisms were described and the techniques for determining the sensitivity of different materials to hydrogen damages were presented.

Against pressure vessel wet H2S in the environment often stress corrosion damage,combing work practice,discussed in different situations steel pressure vessel in the selection requirements.

Large corrosion on petrochemical equipments occurs under the condition of wet H2S.

The formation of wet H_2S corrosion systems of HCl-H_2S-H_2O,HCN-H_2S-H_2O H_2S-H_2O and CO_2-H_2S-H_2O, corrosion locations and corrosion mechanisms are described in detail in respect of effective process corrosion prevention measures to be taken,corrosion impact factors and corrosion control techniques,etc.

The analysis of corrosion of equipment with presence of hydrogen concluded that the hydrogen damage,hydrogen and wet H_2S corrosion,high-temperature hydrogen and H_2S corrosion,hydrogen induced spalling of stainless steel overlay welds are the major causes of corrosion failure of equipment.

The corrosion cracking mechanisms of carbon steels and low-alloy steels in wet hydrogen sulfide environment, the relative factors and the basic principles for controlling the corrosion cracking were described.

The corrosion behavior of refinery equipment in the wet hydrogen sulfide environment and influential factors of the corrosion were described and the protection measures were suggested.

The chemical, metallographic and SEM testings confirmed that the rupture was the result of stress corrosion cracking in the wet hydrogen sulfide environment because of inappropriate material selection.