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A new kind of corrosion resistant steelfor cargo oiltanks(COT)was developed.The influences of finalrolling temperature,cooling rate,and finalcooling temperature on microstructure were investigated.The proper rolling process parameters were obtained through multi-pass thermalsimulation test.The finalrolling temperature is about 820 ℃,the finalcooling temperature is about 600 ℃,and the cooling rate should be controlled between 10 ℃/s and 20 ℃/s.Based on the above analysis of the results,three groups of rolling samples by thermo mechanicalcontrolprocess are prepared.The tensile strength,yield strength,and toughness of the corrosion resistant steelare measured,which meet the requirements of DH36 steel,it can instruct the actualrolling production.The corrosion behaviour is also researched by weight loss and electrochemicalimpedance spectroscopic method,and it is found that the steelhas good corrosion resistance performance,the best one is No.3 steel,the corrosion rate of which is about 1/4 of the accepted criterion.
A new kind of corrosion resistant steel for cargo oil tanks (COT) was developed. These influences of final rolling temperature, cooling rate, and final cooling temperature on microstructure were. The proper rolling process parameters were obtained through multi-pass thermal dispersion test. about 820 ° C, the final cooling temperature is about 600 ° C, and the cooling rate should be controlled between 10 ° C / s and 20 ° C / s.Based on the above analysis of the results, three groups of rolling samples by thermo mechanical control process are prepared. The tensile strength, yield strength, and toughness of the corrosion resistant steelare measured, which meet the requirements of DH36 steel, it can instruct the actual rolling production.The corrosion behavior is also researched by weight loss and electrochemicalimpedance spectroscopic method, and it is found that the steel has good corrosion resistance performance, the best one is No.3 steel, the corrosion rate of which is ab out 1/4 of the accepted criterion.