Corrosion-resisting properties of maraging stainless steel 00Crl3Ni7Co5Mo4W (/% : 0. 007C

13. 23 Cr

7. 02Ni

5. 06Co

3. 72Mo

0. 96W) melted by 50 kg VIM and solid-solution treated at 1 100 °C for 1 h + aged at 450 ~ 510 fbr 8 h are studied by using potentiodynamic polarization curves and uniform corrosion immersion test

and the structure of maraging stainless steel is observed and analyzed by optical microscope

TEM and X-ray diffraction. Results show that with increasing ageing temperature

the R precipitated phase increases led to decrease of pitting corrosion resistance in steel

while the amount of austenite reversed-transformed into martensite increases it is available to improve the corrosion resisting properties of the steel. The optimum heat treatment process for the maraging stainless steel 00Crl3Ni7Co5Mo4W is solid-solution treating at 1 100℃ for 1 h + ageing at 470℃ for 8 h

its corrosion rate is 1.259 0 μm/a and pitting corrosion potential is 252 mV.