By using the variation of properties and microscopic structure under different conditions after normalization of steel

and combining with its CCT curves

the influence of critical cooling speed upon properties and microscopic structure of said steel has been analysed.Analysis shows that the WB36 steel after normalization

the cooling speed in 20~80 min reaches the bainite area

a mixed structure of ferrite and bainite can be obtained

and having better properties.If the temper time is maintained at 3 min/mm

the properties can be ensured not to change.In addition

the varying tendency of hardness and strength is the same

it is recommended to use the hardness as a norm of acceptance for WB36 steel

but the error appeared in conversion calculation of different hardmeters has to be considered.