TH146810A - Hot rolled steel plate with a high yield strength ratio with excellent low temperature impact absorption and HAZ softening resistance and manufacturing method for that. - Google Patents

Abstract

DC60 (07/02/57) Hot rolled steel sheet It has the greatest tensile strength of 600 MPa or more and has a low temperature shock absorption rate. And has excellent HAZ softening resistance and manufacturing methods for that, that is, a sheet alloyed with the following elements representing mass, the percentage is C 0.04 percent to 0.90 percent, Si: 0.4 percent or less, Mn: 1.2 percent to 2.0 percent, P: 0.1 percent or less percent, S: 0.2 percent or less, Al: 1.0 percent or less, Nb: 0.2 percent to 0.09 percent, Ti: 0.2 percent to 0.07 percent, and N: 0.005 percent or less where 2.0 (less than or equal to) Mn + 8 [Ti percent] + 12 [percent. Nb) (less than or equal to) 2.6 And balance it with Fe and impurities that cannot be avoided. And there is a percentage by area of Pearl Light at 5% or less, with percentage by total area of Martensite. And austenite residue was 0.5% or less and balanced with the metal structure of ferrite and benite, and the mean grain size of ferrite and benite at 10 (pie) m. Or less, the average particle size of the alloy Carbonitride Along with the solder welding surface Non-coexistence with Ti and Nb mixed at 20 nm or less and a yield strength ratio of 0.85 or greater. It has the greatest tensile strength of 600 MPa or more and has a low temperature shock absorption rate. And it has excellent HAZ softening resistance and manufacturing methods for that, that is, alloy steel plates with the following elements, mass%: C: 0.04% to 0.90%, Si: 0.4% or less, Mn. : 1.2% to 2.0%, P: 0.1% or less%, S: 0.2% or less, Al: 1.0% or less%, Nb: 0.2% to 0.09%, Ti: 0.2% to 0.07%, and N : 0.005% or less where 2.0 < _Mn + 8 [% Ti] + 12 [% Nb] < _ 2.6 and balanced with Fe and impervious contaminants. And there is a percentage by area of Pearl Light at 5% or less, with percentage by total area of Martensite. And austenite residue was 0.5% or less and balanced with the metal structure of ferrite and benite, and with the mean grain size of ferrite and benzite of 10 formulas or less. , With average grain size of alloy Carbonitride Along with the solder welding surface Not coexist with Ti and Nb mixed at 20 nm or less and with a yield strength ratio of 0.85 or more:

Claims (1)

1.005 percent or less where 2.0 (less than or equal to) Mn + 8 [Ti percent] + 12 [percent. Nb) (less than or equal to) 2.6 And balance it with Fe and impurities that cannot be avoided. And there is a percentage by area of Pearl Light at 5% or less, with percentage by total area of Martensite. And austenite residue was 0.5% or less and balanced with the metal structure of ferrite and benite, and the mean grain size of ferrite and benite at 10 (pie) m. Or less, the average particle size of the alloy Carbonitride Along with the solder welding surface Non-coexistence with Ti and Nb mixed at 20 nm or less and a yield strength ratio of 0.85 or greater. It has the greatest tensile strength of 600 MPa or more and has a low temperature shock absorption rate. And it has excellent HAZ softening resistance and manufacturing methods for that, that is, alloy steel plates with the following elements, mass%: C: 0.04% to 0.90%, Si: 0.4% or less, Mn. : 1.2% to 2.0%, P: 0.1% or less%, S: 0.2% or less, Al: 1.0% or less%, Nb: 0.2% to 0.09%, Ti: 0.2% to 0.07%, and N : 0.005% or less where 2.0 < _Mn + 8 [% Ti] + 12 [% Nb] < _ 2.6 and balanced with Fe and impervious contaminants. And there is a percentage by area of Pearl Light at 5% or less, with percentage by total area of Martensite. And austenite residue was 0.5% or less and balanced with the metal structure of ferrite and benite, and with the mean grain size of ferrite and benzite of 10 formulas or less. , With average grain size of alloy Carbonitride Along with the solder welding surface Non-coexistence with Ti and Nb blends of 20 nm or less and a yield strength ratio of 0.85 or more, the claim (point one) appears on the advertisement page: 1.Hot rolled steel plate with a high root-point ratio. With strong adsorption rate Shock at low temperature And has excellent HAZ softening resistance, which is unique It consists of the following elements representing mass% C: 0.04% to 0.90%, Si: 0.4% or less, Mn: 1.2% to & n tags: