The test steel 00Cr13Ni7Co5Mo4W (/% ： 0.007C

13.23Cr

7.02Ni

5.06Co

3.72Mo

0.96W) is melted by a 50 kg vacuum induction furnace

cast to 10 kg ingot

forged to 55 mm x 55 mm billet and rolled to 3 mm x 60 mm strip. The precipitating behavior of the steel is analyzed by thermodynamic calculation software Thermo-Calc

and the structure

mechanical properties and corrosion performance of the steel are studied by optical

transmission electron microscope and potentiodynamic polarization method. Results show that R phase is main strengthening phase in the maraging stainless steel during aging process ； in order to get fine

dispersed R phase and better combination of strength-toughness of steel

the optimum heat treated process is defined that is solid-solution treating at 1100 ℃ + aging at 490 ℃

and the tensile strength

yield strength and elongation of the steel are respectively 1450 MPa

1320 MPa and 10.8% ； the breakdown potential and the annual corrosion rate in artificial sea water of maraging stainless steel 00Cr13Ni7CoMo4W are respectively 230 mV and 1.51 μm/a

it has better corrosion resistance.