STP792

    Effect of Microstructure on Sulfide-Stress-Cracking Resistance of High-Strength Casing Steels

    Published: Jan 1983


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    Abstract

    The effect of microstructure on the sulfide-stress-cracking (SSC) resistance of developmental high-strength Cr-Mo and Mn-Mo casing steels has been evaluated. Results obtained in many investigations, some previously published and some new, conducted at this laboratory over the past decade are presented and discussed in the light of published results on hydrogen-assisted fracture of steels from other laboratories. The processing variables examined include hot working, austenitizing conditions, quench rate, tempering temperature, and cooling rate from the tempering temperature. An analysis of the data reveals that SSC resistance is aided by refinement of the austenite grain size, by the achievement of a fully martensitic microstructure during hardening, by increasing the tempering temperature, and by water quenching after tempering. The SSC resistance is degraded severely by tempering just above the lower critical (Ac1) temperature and then water quenching. Cast structures are comparable to wrought structures in SSC resistance.

    Keywords:

    steels, hydrogen embrittlement, hydrogen sulfide environment, stress-corrosion cracking, casing material, alloy steels, molybdenum steels, chromium-molybdenum steels, microstructure, heat treatment, grain size, quenching, tempering, temper brittleness


    Author Information:

    Sponseller, DL
    Staff metallurgist and senior research associate, Climax Molybdenum Company of Michigan, Ann Arbor, Mich.

    Garber, R
    Staff metallurgist and senior research associate, Climax Molybdenum Company of Michigan, Ann Arbor, Mich.

    Straatmann, JA
    Manager, Oil Industry Development, Climax Molybdenum Co., Pittsburgh, Pa.


    Paper ID: STP31771S

    Committee/Subcommittee: E04.05

    DOI: 10.1520/STP31771S


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