Abstract
A series of unique metal-to-metal sealing systems which use high deformation of the seal member has demonstrated excellent seal performance at high and low pressures in gas and liquid streams. However, because the high deformation makes even conventional ring gasket materials prone to hydrogen sulphide cracking, the soft carbon steels used in early applications cannot be used in hydrogen sulphide service. A development program was initiated to evaluate materials which would have appropriate sealing characteristics but can undergo significant cold strain and avoid stress corrosion cracking when exposed to hydrogen sulphide and/or chlorides. Numerous materials were evaluated for hardness, strength and strain-hardening characteristics to select materials which will seal as effectively as soft carbon steel. The prime choices were tested in chloride solutions with hydrogen sulphide saturation to verify that stress corrosion cracking does not occur.
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