Low-silicon titanium-containing acid pickling board with yield strength being in 500MPa grade and preparation method thereof

Abstract

The invention discloses a low-silicon titanium-containing acid pickling board with yield strength being in a 500MPa grade and a preparation method thereof. The acid pickling board comprises the following chemical ingredients by weight percentage: 0.06-0.09% of C, 0.35-0.80% of Mn, 0.03-0.06% of Als, 0.07-0.09% of Ti, less than or equal to 0.05% of Si, less than or equal to 0.01% of Nb, less than or equal to 0.008% of S, less than or equal to 0.015% of P, less than or equal to 0.004% of N, less than or equal to 0.003% of N and the balance of iron and unavoidable impurities. The acid pickling board is prepared by the following steps: converter melting, ladle argon stirring, LF refining, RH vacuum treatment, continuous casting, hot continuous rolling, laminar cooling, reeling and acid pickling in a continuous acid pickling line. According to the acid pickling board, the form of organization comprises ferrite, a small amount of carbide and a small amount of pearlites, the grain size number is 11-12 grade, the yield strength is 535-550MPa, and the tensile strength is 625-645MPa, the ductility is 22-25%, the band steel face quality is in a grade more than FB (02), and the processability is good.

Description

technical field [0001] The invention relates to a pickling board and a preparation method thereof, in particular to a low-silicon titanium-containing pickling board with a yield strength of 500 MPa and a preparation method thereof. Background technique [0002] High-strength low-alloy automotive structural steels are generally designed with Nb microalloys and appropriate addition of Si components. In the hot rolling process, due to the recrystallization inhibitory effect of Nb, the rolling force of this steel type rises rapidly during the rolling process, and the damage to the roll is more obvious, resulting in pitting of the roll and affecting the strip after pickling. Surface Quality. The addition of Si element increases the viscosity of iron oxide scale on the surface of strip steel, which is difficult to remove, and longitudinal oxygen-compressed stripes appear along the rolling direction. Contents of the invention [0003] In order to solve the above-mentioned techn...

AI Technical Summary

Problems solved by technology

In the hot rolling process, due to the recrystallization inhibitory effect of Nb, the rolling force of this steel type rises rapidly during the rolling process, and the damage to the roll is more obvious, resulting in pitting of the roll and affecting the strip after pickling. Surface Quality

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