Effects of pH Value on the Stress Corrosion Cracking of Super 13Cr Tubing Steel

Effects of pH value on the stress corrosion cracking (SCC) of super 13Cr tubing steel were investigated in 3.5% NaCl solution, that mechanics properties and fracture morphology and SCC resistance and stress corrosion cracking susceptibility index (k(SCC)) were analyzed by slow strain rate tensile (SSRT) stress corrosion cracking experiment method and sigma-epsilon curve and SEM. the results showed that super 13Cr tubing steel has good properties of resistance stress corrosion cracking in acidic medium, effects of pH value on super 13Cr tubing steel resistance stress corrosion was not very obviously in the acidic medium, with pH value decreased, super 13Cr tubing steel tensile strength decreased, elongation rate decreased, fracture area contraction ratio decreased, break time reduced, the tendency of the stress corrosion cracking increased, the stress corrosion cracking susceptibility index k(sigma) and k(epsilon) were all increasing, that increased degree of k(epsilon) were obviously than k(sigma), effects of pH value on the plastic deformation of super 13Cr tubing steel were greater than tensile strength.