Method for manufacturing high-strength galvannealed steel sheet
A technology of hot-dip galvanized steel sheet and high-strength alloy, which is applied in hot-dip galvanizing process, metal material coating process, coating, etc., and can solve problems such as long alloying treatment time, delayed zinc alloying reaction, complicated operation, etc. , to achieve the effect of good coating appearance and good coating adhesion
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Embodiment 1
[0032] First, an example related to the method for producing the second half of the high-strength high-ductility alloyed hot-dip galvanizing will be described.
[0033] Table 1 shows the original plates used in the tests. The original plate 1 and the original plate 2 are steel plates that have been cold-rolled, annealed, and pickled. The original plate 3 is a pickled hot-rolled steel plate. In addition, Table 3 also shows the material values measured after temper rolling each original plate.
[0034] After each original plate was degreased under the conditions in Table 2, the pickled steel plates were pickled under the conditions in Table 3. Pre-plating of Ni was performed by electroplating under the conditions in Table 4.
[0035] After pre-plating Ni, in 3% H 2 +N 2 Heated to 450°C at a heating rate of 30°C / sec in an atmosphere, immediately immersed in a hot-dip galvanizing bath (containing 0.15% Al) kept at 450°C, kept for 3 seconds, then wiped, and the unit surface ...
Embodiment 2
[0049] An example related to a method of galvanizing a P-added steel sheet will be described.
[0050] In the following examples, cold-rolled and annealed steel sheets having the compositions shown in Table 6 were used.
[0051] Table 6 Composition of the original test board
[0052]
Embodiment 9～11 and comparative example 4
[0054] Table 7 shows the combinations of the original plates used and the processing conditions. After the first pickling treatment, water washing and drying were carried out. In addition to Comparative Example 4, the second pickling treatment was carried out. After water washing, electroplating was carried out under the conditions shown in Table 4. The adhesion amount was 0.3 g / m 2 The pre-plated Ni. The conditions of the pickling treatment are shown in Table 8. Then, in a 3% hydrogen + 95% nitrogen atmosphere, heat at 40°C / s to 460°C, immediately dip in a hot-dip galvanizing bath containing Al at 455°C, and adjust the weight per unit surface area of the coating by wiping. 60g / m 2 . The Al concentration of the hot-dip galvanizing bath is shown in Table 7. Immediately after wiping, heat up to the specified temperature shown in Table 7 at a heating rate of 50°C / s, and after soaking for a specified time, perform slow cooling at 10°C / s for 3 seconds, and then cool at 20°C / s...
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