High-strength IF steel plate with yield strength of 170-300 Mpa level and production method

Abstract

The invention provides a high-strength IF steel plate with yield strength of 170-300 Mpa level and a production method. The steel plate is prepared from, by mass, 0.004-0.010% of C, smaller than or equal to 0.030% of Si, 0.30-1.10% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 0.010-0.060% of Als, 0.010-0.080% of Ti, 0.010-0.060% of Nb, 0.010-0.050% of Cu, 0.0005-0.0080% of N, smaller than or equal to 0.0050% of O and the balance Fe and unavoidable impurity elements. Compared with the prior art, the high-strength IF steel plate has the advantages that the yield strength is greater than or equal to 170 MPa, the tensile strength is 330-460 MPa, the A80 is greater than or equal to 36%, the n value is greater than or equal to 0.19, the r value is greater than or equal to 1.6, and good matching of the strength and formation performance is achieved.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to steelmaking, hot rolling, pickling, five-stand full-six-high cold tandem cold rolling, degreasing, continuous annealing or hot-dip galvanizing, smoothing or skin-passing processes of metal plates (strips), Specifically, it is a high-strength IF steel plate with a yield strength of 170-300Mpa and its production method. Background technique [0002] IF steel, the full name of Interstitial Free Steel, that is, interstitial free steel, has excellent deep drawing performance, and now the elongation and r value can reach 50% and more than 2.0. In IF steel, due to the low content of C and N, a certain amount of titanium (Ti), niobium (Nb) and other strong carbon-nitrogen compound forming elements are added to completely fix the interstitial atoms such as carbon and nitrogen in ultra-low carbon steel as Carbonitrides, resulting in clean ferritic steel without interstitial atoms, that is, ul...

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Problems solved by technology

The patent is for ultra-deep drawing grade IF steel plate with low strength and yield strength <170Mpa

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