CALL FOR STEEL LAINED TO THE TREATMENT OF HIGH RESISTANCE AND METHOD OF PRODUCTION OF THE SAME

摘要

Hot rolled steel sheet with high strength and production method of the hot rolled steel, this invention refers to the supply of a high strength hot rolled steel plate containing in mass (c: 0050 to 0200%Si: 0,01 to 1,5%,No: 1,0 to 3,0%,B: 002 to 00030%,Ti: 0,03 to 0,20%,P: limited to 0,05% or less, s: limited to 0009% or less, and one or more elements between NB: 0,01 to 0,20%,V: 0,01 to 0,20%,And Mo: 0,01 to 0,20%,With the balance being composed of faith and the inevitable impurities. On the hot rolled steel sheet of high resistance, the reason for the length of the edges of the small -angle crystal grains that are edges that have an angle of orientation of the 5 or more crystal, but 15 -degree Meno s for the length of the large -angle crystal grain edges Which are edges that have an angle of orientation of 15 -degree or more crystal is 1:1 to 1:4, the amount of total C and B segregation at the edges of the large angle crystal grains is 4 to 20 -atoms /nm2, the tensile resistance is 850 -mpa or more, and the burst ratio is 25% or More.