Abstract
The development of low alloy steels for heavy section wellhead equipment which will be subject to hydrogen sulfide stress corrosion cracking (SSC) is described. The continuous cooling transformation behavior of nine steels was evaluated by dilatometry. Double cantilever beam fracture mechanics tests were used to evaluate the SSC resistance of twentyone quenched and tempered steels, including two steels currently specified for wellhead applications, 0.17C-0.6Mn-1.25Cr-1Mo-0.25V and 0.2C-0.5Mn-2.25Cr-1Mo, and higher hardenability modifications of the latter steel. The development of even higher hardenability Mn-Cr-Ni-Mo-Nb steels (0.25C-1.25Mn-0.9Ni-1Cr-0.75 to 1.35Mo0.03Nb) is also described. Fine, as- cooled microstructures with good SSC resistance can be produced from these experimental compositions at cooling rates at least equivalent to that at the center of water- quenched 400- mm (16- in.) thick plate.
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