Method for improving phosphating performance of low-carbon aluminum killed steel automobile plate and automobile plate
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A low-carbon aluminum-killed steel and automobile sheet technology, applied in the field of steel smelting, can solve problems such as insufficient phosphating performance, and achieve the effect of improving surface quality and improving phosphating performance
Active Publication Date: 2020-09-11
SHOUGANG CORPORATION
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[0003] At present, there is a problem of insufficient phosphating performance in low-carbon aluminum-killed steel automotive sheets
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Embodiment 1
[0081] In the present embodiment, the billet component control is as shown in Table 1:
[0082] Table 1
[0083] C Si mn P S Al B N 0.0193 0.010 0.194 0.009 0.006 0.039 0.002 0.003
[0084] The steel billet temperature is 1190°C, the exit temperature of rough rolling is 1045°C, the final rolling temperature is 915°C, and the coiling temperature is 680°C.
[0085] Cold rolling reduction is 67.6%.
[0086] The continuous annealing process is controlled as follows: the dew point of the heating section in the furnace is -25°C, and the other sections are -46°C; the O content of each section is 10ppm; the H2 content is 5%.
[0087] The leveling process is controlled as follows: the Ra value of the steel plate surface after leveling is 1.2um, and the RPc is 93.
[0088] The topography of the phosphating film on the surface of the low-carbon aluminum-killed steel automobile sheet produced by this embodiment is as follows figure 1 shown, from figur...
Embodiment 2
[0090] In the present embodiment, the billet component control is as shown in Table 2:
[0091] Table 2
[0092] C Si mn P S Al B N 0.0190 0.013 0.199 0.006 0.005 0.043 0.003 0.003
[0093] The steel billet temperature is 1180°C, the rough rolling exit temperature is 1040°C, the final rolling temperature is 910°C, and the coiling temperature is 685°C.
[0094] The cold rolling reduction was 86.0%.
[0095] The continuous annealing process is controlled as follows: the dew point of the heating section in the furnace is -22°C, and the other sections are -49°C; the O content of each section is 13ppm; the H2 content is 7%.
[0096] The leveling process is controlled as follows: after leveling, the Ra value of the steel plate surface is 1.3um, and the RPc is 116.
[0097] The topography of the phosphating film on the surface of the low-carbon aluminum-killed steel automobile sheet produced by this embodiment is as follows figure 2 shown, from ...
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Abstract
The invention particularly relates to a method for improving the phosphating performance of a low-carbon aluminum killed steel automobile plate and the automobile plate, and relates to the field of steel smelting. The method for improving the phosphating performance of the low-carbon aluminum killed steel automobile plate comprises the steps of casting blank component control, hot rolling, cold rolling, annealing and leveling; in the casting blank component control step, casting blank are controlled to comprise the following components of, in percentage by mass, 0.01% to 0.02% of C, smaller than or equal to 0.02% of Si, 0.10% to 0.30% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 0.03% to 0.06% of Al, 0.001% to 0.003% of B, smaller than or equal to 0.005% of N and the balance Fe and inevitable impurities; in the hot rolling step, the tapping billet temperature is 1140 DEG C to 1240 DEG C, the rough rolling outlet temperature is 1020 DEG C to 1100 DEG C, the final rolling temperature is 900 DEG C to 960 DEG C; in the cold rolling step, the cold rolling reduction rate is 67.6% to 86.1%; and in the annealing step, the dew point temperature of a heating section of an annealing furnace is-30 DEG C to 0 DEG C. According to the embodiment of the method for improving the phosphating performance of the low-carbon aluminum killed steel automobile plate and the automobile plate, the low-carbon aluminum killed steel automobile has the advantages that the grain size of a phosphating film on the surface is less than 5 microns, the coverage rate is 100%, the P ratio is more than 85%, and the phosphating performance is excellent.
Description
technical field [0001] The invention relates to the field of steel smelting, in particular to a method for improving the phosphating performance of a low-carbon aluminum-killed steel automobile plate and the automobile plate. Background technique [0002] Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film, and the formed phosphate conversion film is called a phosphating film. The purpose of phosphating mainly includes the following aspects: 1) Provide protection to the base metal and prevent the metal from being corroded to a certain extent; 2) It is used as a primer before painting to improve the adhesion and corrosion resistance of the paint film layer; 3 ) is used for anti-friction lubrication in metal cold working process. [0003] At present, the low-carbon aluminum-killed steel automobile sheet has the problem of insufficient phosphating performance. Contents of the invention [0004] In view of the ab...
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