Alloyed galvanized steel sheet excellent in solder plated adhesion and its production method
A technology of hot-dip galvanized steel sheet and manufacturing method, applied in the field of alloyed hot-dip galvanized steel sheet and its manufacturing
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Embodiment 1
[0130] The steel ingot with the chemical composition shown in Table 1 was heated to 1250° C., and hot rolled to remove the surface scale to produce a hot rolled steel plate with a thickness of 2.0 mm. Then carry out cold rolling with a rolling ratio of 50%, and make a cold-rolled steel plate with a thickness of 1.0mm, cut out a width: 70mm, length: 180mm, in a nitrogen atmosphere with a dew point of -30°C and containing 3% by volume of hydrogen. In the heating furnace, a heat treatment at 830°C is carried out, and after cleaning the surface, it is made into a raw steel plate. The original steel sheet was pickled by dipping in 5% hydrochloric acid at 60°C for 10 seconds, and then recrystallized annealed and hot-dip galvanized (hereinafter simply referred to as "plating") using a laboratory plating simulator. Recrystallization annealing conditions and plating conditions are as follows.
[0131] Table 1
[0132]
[0133] recrystallization annealing
[0134] Atmosphere: 5% b...
Embodiment 2
[0171] The steel ingot with the chemical composition shown in Table 3 was heated to 1250° C., hot rolled, and the surface scale was removed to produce a hot rolled steel plate with a thickness of 2.0 mm. Next, cold rolling was carried out at a rolling ratio of 50% to produce a cold-rolled steel sheet with a thickness of 1.0 mm, which was cut out to a width of 70 mm and a length of 180 mm, and the surface was cleaned to obtain a raw steel sheet. After pickling the original steel sheet by immersing it in 5% hydrochloric acid at 60°C for 10 seconds, it performed a primary heat treatment at 400°C for 1 second in a nitrogen atmosphere (dew point: +20°C) containing 0.1% by volume of oxygen. Thereafter, secondary heat treatment was performed at 750° C. for 1 second in a nitrogen atmosphere (dew point: +20° C.) containing 5 vol % of oxygen. Using the above heat-treated original steel sheet, recrystallization annealing and plating were performed with a laboratory plating simulator. Re...
Embodiment 3
[0198] A steel ingot having the chemical composition shown in Table 5 was heated to 1250° C., and hot rolled to remove surface scale to produce a hot-rolled steel plate with a thickness of 2.0 mm. Then carry out cold rolling with a rolling ratio of 65%, and make a cold-rolled steel plate with a thickness of 0.7mm, cut out a width: 70mm, length: 180mm, and have a dew point of -30°C in a nitrogen atmosphere containing 3% hydrogen by volume. In the heating furnace, a heat treatment at 830°C is carried out, and after cleaning the surface, it is made into a raw steel plate. The original steel sheet was dipped in 5% hydrochloric acid at 60° C. for 10 seconds to pickle, and then recrystallization annealing and plating were performed using a laboratory plating simulator. Recrystallization annealing conditions and plating conditions are as follows.
[0199] table 5
[0200]
[0201] recrystallization annealing
[0202] Atmosphere: 5% by volume hydrogen + nitrogen (dew point: -35°...
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Abstract
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