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| Quick acting valves |
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| Valve apparatus |
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| Method for controlling solenoid de-energized air gap |
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| Cleaning machine |
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| Adjustable valve for liquids for equipment having a medical application |
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| Vented ball-type cut-out cock |
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| High pressure hose suitable for conveying gases and gas-containing fluids |
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| Valve plate construction |
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Steel sheet dip-plated with a Zn-Al alloy and process for the manufacture thereof
| Details |
Inventors: Oishi, Hiroshi; Maruyama, Akira;
Assignee: Sumitomo Metal Industries, Ltd. (Osaka, JP)
Primary Examiner: Dean; R.
Assistant Examiner: Koehler; Robert R.
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis
A low carbon steel sheet dip-plated with a Zn-Al alloy, which is in a non-recrystallized and rolled state and which comprises, as an element to raise the recrystallization temperature, at least one of Ti: 0.01.about.0.40% by weight, Nb: 0.01.about.0.10% by weight, and B: 0.001.about.0.010% by weight, and a process for the manufacture thereof which comprises carrying out dip-plating at a temperature lower than the recrystallization temperature. |
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DETAILED DESCRIPTION The object of the present invention is to provide a low carbon steel sheet dip-plated with a Zn-Al alloy in a non recrystallized state possessing a tensile strength of 50 kgf/mm.
sup.
2 or higher and a process for producing the same while carrying out the pretreatment and dip-plating of the steel sheet at a temperature lower than the recrystallization temperature for the steel sheet, the resulting steel sheet being free of surface defects caused by unplated areas.
The inventors of the present invention found that the addition of at least one of Ti, Nb, and B is effective to markedly raise the recrystallization temperature of low carbon steels.
Thus, a low carbon steel sheet dip-plated with a molten Zn-Al alloy of the present invention comprises C:0.
07% by weight or less, and at east one of Ti:0.
01.
about.
0.
40% by weight.
Nb:0.
01.
about.
0.
10% by weight, and B:0.
001.
about.
0.
010% by weight.
The steel sheet further comprises a dip-plated Zn-Al alloy layer containing 3.
about.
8% by weight of Al on the steel sheet substrate in a non-recrystallized and rolled state.
According to one aspect of the present invention, the above-described steel sheet is subjected to a continuous annealing treatment at a temperature of 600.
degree.
C.
or higher but not higher than the recrystallization temperature of the steel substrate, and the pretreated steel sheet is dip-plated with a molten Zn-Al alloy containing 3.
about.
8% by weight of Al.
The term "non-recrystallization" is herein employed to describe the state of a steel sheet which is annealed at a temperature of not higher than the recrystallization temperature so as to avoid a decrease in mechanical strength which usually occurs during annealing for a cold-rolled steel sheet.
Under usual conditions, the recrystallization temperature is generally 550.
about.
680.
degree.
C.
for low carbon steel strips of the category to which the present invention pertains.
In this respect, it is possible to raise the recrystallization temperature to 650% or higher, preferably 700% or higher according to the present invention
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Metal Working 
