The effect of 0. 008 7% 〜0. 150 0% N on tensile and compression properties of hot-rolled steel 0Crl8Ni9N (% ： 0.044 〜0.049C

0.41 〜0.51Si

1.46 ~ 1.52Mn

17. 92 ~ 18. 15Cr

9.09 〜9.24Ni

0.01 〜0.03Ti) with strain rate 5 x 10

-3

s

-1

and 1 s

-1

at 800 〜130 0 °C has been studied by using Gleeble 1500 thermal simulation machine and the effect of N content on dynamic recrystallization of the steel is analyzed. Results show that with increasing N content in steel the reduction of area of the steel obviously decreases while its optimum temperature range of thermoplasticity increases ； as the N content in steel is less than 0. 050 0%

the optimum temperature range of thermoplasticity of the steel is 950 - 110 0  °C

and as N content is 0.080 0% 〜0. 150 0%

that is 1150 - 1250 °C .