LEAN DUPLEX STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE AND HOT WORKABILITY

摘要

Desalination plants of the present invention, pulp and paper industry equipment, chemical industry equipment, the low-alloyed two phase stainless steel of construction equipment one is for industrial plant, comprising: in weight %, C: 0 or less than 0.06%, Si: 0 or less than 1.5%, Mn: 0 or less than 1.8%, Cr: 19~23%, Ni: 1.8~3.5%, Mo 0.5~1.0%, copper: 0.3~1.0%, N: 0.16~0.30%, Al: 0.003~0.05%, B: 0.001~0.005%, Ca: from 0.001 to 0.01% includes, the content of stainless steel, and carbon steel O is limited to be no more than 0.01%, the summation of remainder, including Fe and inevitable impurity, B and Ca is in weight percent 0.0035 to 0.006%, the ingredient of stainless steel (1), the value obtained from the Creq of formula is 22.5 to 23.5, it by the value of the Nieq of formula is 9. to (2)5 to 11, hot-workability index is by calculating following equation (3) more than 75, and hot-workability index provides minimum temperature, in the excellent corrosion resistance of the cross-sectional area rate of deceleration and the stainless steel of hot-workability with low-alloyed two phase stainless steel. [ Cr ] + [ Mo ] + 1.5 [Si] --- (1) [Ni]+30 ([C]+[N])+0.5 ([Mn]+[copper]) --- (2) -195+10.2 Creq + 1.19 Nieq+822 [Al]+1297 (B+Ca) --- (3)