Third-generation high-strength high-toughness automobile steel and preparation method thereof
An automotive and high-strength technology, applied in the field of new third-generation automotive steel and its high-efficiency preparation, can solve the problems of increased energy consumption, low elongation, long heat treatment time, etc., and achieves a simple and economical production process with good plasticity. and impact resistance, the effect of short heat treatment time
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Embodiment 1
[0038] First, smelting and continuous casting are carried out according to the above composition range, and then the composition of the slab is detected, see Table 1.
[0039] Table 1 Slab composition (wt.%)
[0040]
[0041] Heat the 20-50mm thick billet to 1150°C for homogenization for 2 hours, and roll it at 1000°C to form a 1.5-3.5mm thick plate with a total reduction rate of 80-95%.
[0042] The specific heat treatment process parameters of the hot-rolled plate are shown in Table 2.
[0043] Table 2 heat treatment process parameters
[0044]
[0045] The mechanical properties of the high-strength automotive steel prepared according to Table 1 and Table 2 are shown in Table 3.
[0046] Table 3 mechanical properties
[0047]
[0048] Table 4 shows the dimensions of lath bainite and retained austenite in the thickness direction of the high-strength automotive steel prepared according to Table 1 and Table 2.
[0049] Table 4 Dimensions in the direction of tissue ...
Embodiment 2
[0056] First, smelting and continuous casting are carried out according to the above composition range, and then the composition of the slab is detected, see Table 6.
[0057] Table 6 Slab composition (wt.%)
[0058]
[0059] Heat the 20-30mm thick casting slab to 1150°C for 2h homogenization, and roll it at 1000°C to form a 1.5-3.5mm thick plate with a total reduction rate of 80-95%.
[0060] The specific heat treatment process parameters of the hot-rolled plate are shown in Table 7.
[0061] Table 7 heat treatment process parameters
[0062]
[0063] The mechanical properties of the high-strength automotive steel prepared according to Table 6 and Table 7 are shown in Table 8.
[0064] Table 8 mechanical properties
[0065]
[0066] Table 9 shows the lath bainite and retained austenite dimensions in the thickness direction of the high-strength automotive steel prepared according to Table 6 and Table 7.
[0067] Table 9 Dimensions in the direction of tissue thickn...
Embodiment 3
[0074] First, smelting and continuous casting are carried out according to the above composition range, and then the composition of the slab is detected, see Table 11.
[0075] Table 11 Composition of the slab (wt.%)
[0076]
[0077] Heat the 20-30mm thick casting slab to 1150°C for 2h homogenization, and roll it at 1000°C to form a 1.5-3.5mm thick plate with a total reduction rate of 80-95%.
[0078] See Table 12 for the specific heat treatment process parameters of the hot-rolled sheet.
[0079] Table 12 heat treatment process parameters
[0080]
[0081] The mechanical properties of the high-strength automotive steel prepared according to Table 11 and Table 12 are shown in Table 13.
[0082] Table 13 Mechanical properties
[0083]
[0084] Table 14 shows the dimensions of lath bainite and retained austenite in the thickness direction of the high-strength automotive steel prepared according to Table 11 and Table 12.
[0085] Table 14 Dimensions in the direction...
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