A cold-rolled ultra-high-strength dual-phase steel plate for automobiles with corrosion resistance and preparation method thereof
A corrosion-resistant, ultra-high-strength technology, applied in the production and application of metal materials and automotive steel, can solve the problems of high cost and high alloy element content, achieve superior corrosion resistance, improve process performance, and facilitate testing of steel continuous casting and The effect of cold rolling
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Embodiment 1
[0036] The annealing process of Example 1 (component 1) is as follows: the preheating section is heated to 150 °C at 7.4 °C / s, the heating section is heated to a two-phase zone holding temperature of 800 °C at 2.6 °C / s, and the two-phase zone is held for 180s. The slow cooling section was slowly cooled to 640°C, then rapidly cooled to 260°C at a cooling rate of 40°C / s, overaging for 368s, and then slowly cooled to room temperature.
Embodiment 2
[0037] The annealing process of Example 2 (component 2) is as follows: the preheating section is heated to 180 °C at 7.4 °C / s, the heating section is heated to a two-phase zone holding temperature of 810 °C at 2.6 °C / s, and the two-phase zone is held at a temperature of 180s. The slow cooling section is slowly cooled to 640°C, then rapidly cooled to 250°C at a cooling rate of 40°C / s, over-aged for 320s, and then slowly cooled to room temperature.
Embodiment 3
[0038] The annealing process of Example 3 (component 1) is as follows: the preheating section is heated to 150 °C at 7.4 °C / s, the heating section is heated to 820 °C in the two-phase zone at 2.6 °C / s, the two-phase zone is held at a temperature of 180s, and then The slow cooling section was slowly cooled to 620°C, then rapidly cooled to 260°C at a cooling rate of 40°C / s, overaging for 368s, and then slowly cooled to room temperature.
[0039] The mechanical properties of the steel in this example are shown in Table 2, where Rp is obtained when the annealing temperature is 820°C 0.2 =1020MPa, R m =1760MPa, A 50 =8.06%, Rp 0.2 / R m = 0.58 cold-rolled ultra-high strength dual-phase steel. According to "Metal Materials Laboratory-Uniform Corrosion Full Immersion Test Method JB / T 7901-2001", the uniform corrosion full immersion test is used to simulate the industrial atmospheric environment, and the corrosive solution is 0.005mol / L NaHSO 3 Solution (0.52g / L), within 130h test...
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