High-strength IF steel plate with yield strength of 170-300 Mpa level and production method
A technology of yield strength and production method, applied in the field of high-strength IF steel plate, can solve the problems of low strength of ultra-deep drawing grade IF steel plate
Inactive Publication Date: 2020-02-07
MAANSHAN IRON & STEEL CO LTD
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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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[0057] A high-strength IF steel plate with a yield strength of 170-300Mpa, including the following components by mass percentage: see Table 1 below. The rest is Fe and unavoidable impurity elements.
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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...
Claims
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Patent Timeline

IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16C21D8/02C21D1/26C22C33/04
CPCC21D1/26C21D8/0226C21D8/0236C21D2211/005C22C33/04C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/16
Inventor 王占业杨平汪建威李进汤亨强吴浩俞波唐东东何峰杨仕清胡迪屈博文黄冉
Owner MAANSHAN IRON & STEEL CO LTD
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