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Through tensile test

metallographic observation

scanning microscope observation and 72 h corrosion tests in simulated Cl environment and simulated industrial atmospheric environment

the effects of adding 0. 23% Cr on the microstructure and mechanical properties and corrosion resistance of Φ12 mm 20MnSiV high strength reinforced steel are studied. The results show that the grain size is refining obviously with 0. 23% Cr addition

and the grain size rating increase from 8. 5 ~9. 0 to 9. 0 ~ 9. 5

meanwhile the distribution of pearlite is more uniform

and the difference of pearlite content between internal region and the region near the surface decreases from 7. 24% to 3. 22%. With the addition of 0. 23%Cr

the element "V" can be saved

under the prerequisite for mechanical property guaranteed

vanadium contents d

ecrease by about 0. 01%. Furthermore

the corrosion resistance of rebar with 0. 23% Cr is improved in industrial atmosphere environment

however

adding small amount Cr the resistance property to chloride ions environment of steel rebar decreases slightly.