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Vol.21, No.2, 98 ~ 105, 1983
Title
The Effects of Cooling Rate after Controlled Rolling on the Mechanical Properties of HSLA Line Pipe Steels
김태웅Tai Ung Kim, 김재은Jae Eun Kim, 김영길Young Gil Kim
Abstract
The effects of cooling rates after controlled rolling (C.R.) on the mechanical properties were investigated for the Mo-Ni-Nb-V type HSLA line pipe steels. The accelerated cooling was carried out after C.R. in the temperature range from 800℃ to 600℃ followed by air cooling. Cooling methods employed were air cooling (1.3℃/sec), compressed air cooling (4.1℃/S), oil quenching (9.5℃/S) and water spray cooling (13.6℃/S). It was found from this work that controlled rolled 0.3%Mo-0.3%Ni type steel exhibited 40% yield strength increments by water spray cooling, while impact energy was not changed greatly. For the conventionally rolled boron containing steel, impact energy at -20℃ was increased from about 3 to 17㎏f.m under water spray cooled condition.
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