TY - SER AU - Mostofi,J. AU - Zamanian,M. TI - Stress cracking of stainless steel safety gate valve stem PY - 2008/// CY - PB - N2 - Transcripción del resumen del autor. This study investigated the failure of a 15-5 PH (UNS S15500) precipitation-hardened stainless steel stem when installed in a 5 1/8in. (130-mm) hydraulic surface safety gate valve working in a sour gas environment. The results indicate that the fracture failure was caused by sulfide stress cracking, which progressed transgranularly in the martensitic matrix ER -