Tensile hot deformation behavior and structure change of high nitrogen austenite stainless steel Mnl6Cr22Nil. 6N0. 6 (%： 0.12C

22.05Cr

15.52Mn

1.64Ni

0. 58N) with strain rate 0.005 s

-1

at 900 ~ 1 300 ℃ have been studied by Gleeble 1500D thermal simulator. Results show that the high nitrogen steel has nice plasticity at 1 100 ~ 1 250 ℃ with the maximum reduction of area is 59% at 1 220 ℃. The observations on structure at tensile fracture show that as the steel tensions at 900 ~ 1 000 ℃ the recrystallization occurs with forming fine grains

at 1 000 ~ 1 100 ℃ the recrystallized grain grows with serrated grain boundary

at 1 100 〜1 300 ℃ the ferrite occurs and with increasing temperature the amount of ferrite increases

and at 1 300 ℃. the melting phenomena of grain boundaries occurs.