A modification to the NACE International test procedure for determining the threshold stress intensity factor (KISSC) in assessing the sulfide stress cracking (SSC) resistance of low-alloy tubular steels was developed based on the use of Heady's second relationship for KISSC calculation. It was shown that only initial and equilibrium crack length, as well as initial wedge load, are needed to determine the KISSC value. Critical flaw sizes for steels investigated for use in inspection of tubulars were estimated from obtained KISSC values.

Subject
Openings, Test methods, Microstructure, Sour environments, Inspection, Stress cracking, Flaws, Deflection, Crack length, Steel, Sulfide stress cracking, Quenching and tempering, Heat treatment
Keywords:
crack length, double-cantilever beam specimen, flow, low-alloy steels, NACE Standard TM0177-90, stress, sulfide stress cracking, tubular steel, wedge load
NACE International
1994
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