 Pipe switch for pneumatic conveying devices |
| What is claimed as new and desired to be protected by Letters Patent is set forth in the appended ... |
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| Control device for double swinging lever of a dobby |
| It is a principal object of the present invention to overcome the drawbacks set forth hereinabove, ... |
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| Capacitor pressure transducer with housing |
| An object of the present invention is to provide an improved pressure transducer and assembly which ... |
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| Quick acting valves |
| I claim: 1. A quick acting isolating valve comprising in combination a valve body having a fixed ... |
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| Valve apparatus |
| OF THE PREFERRED EMBODIMENTS Referring first to FIG. 1, the normally open valve apparatus is ... |
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| Method for controlling solenoid de-energized air gap |
| What is claimed is: 1. In a solenoid-actuated valve wherein a valving element is actuated by an ... |
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| Cleaning machine |
| By extending the so-called hold down belt throughout the entire machine or at least a major portion ... |
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| Adjustable valve for liquids for equipment having a medical application |
| I claim: 1. An adjustable valve for liquids comprising: a flexible tubular body having a first end ... |
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| Vented ball-type cut-out cock |
| Having now described the invention, what we claim as new and desired to secure by Letters Patent, ... |
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| High pressure hose suitable for conveying gases and gas-containing fluids |
| The method of this invention provides a hose with a duplex safety system wherein the hose wall is ... |
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Thinly tin coated steel sheets having excellent rust resistance and weldability
| Details |
Inventors: Wake, Ryousuke; Ezure, Kazuya;
Assignee: Nippon Steel Corporation (Tokyo, JP)
Primary Examiner: Zimmerman; John J.
Assistant Examiner:
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
Surface treated steel sheets having excellent rust resistance and weldability, suitable for manufacturing various kinds of cans, produced by a process comprising applying 0.2 to 1 g/m.sup.2 of tin coating on a surface of a nickel coated cold rolled steel sheet, applying 0.01 to 0.3 g/m.sup.2 of zinc coating on the tin coating in such an amount that the ratio of the zinc coating amount to the tin coating amount is in a range from 2 to 30% by weight, and heating the coatings to alloy substantially all of the zinc into the tin coating layer with substantially no non-alloyed zinc left on the tin coating. |
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DETAILED DESCRIPTION OF THE INVENTION Conventionally, most of surface treated steel sheet materials for cans are coated with various metal coatings, such as Sn, Ni, and Zn coatings, for the purposes of protecting the steel surface from the ambient atmosphere, or corrosive environments formed by corrosive contents of the cans, or further improving the surface appearance of the cans.
In particular, as the materials for food cans and beverage cans, tin-plate and chrome coated steel sheets (TFS) and the like have been mainly used.
In recent years, the art of manufacturing welded cans has been greatly advanced so that the coating amount required for soldering in the soldered can making can be saved and the general tendency is to reduce the coating amount.
Thus according to the conventional soldered can making 2.
8 g/m.
sup.
2 of tin coating (#25 plating) was required for assuring the solderability, whereas according to the welded can making only 1.
15 g/m.
sup.
2 (#10 plating) is sufficient and yet in some cases no tin coating is required and other metal coatings may well be applied so far as they can provide good corrosion resistance.
With the technical limitation being removed in the can manufacturing as above, the tendency has been more promoted toward the minimum coating amount which can satisfy only the corrosion resistance, resulting in the commercial usage of the tin-plates having thin tin coatings (#8 to #20), nickel coated steel sheets and Ni/Sn double layer coated sheets as less costly materials for welded cans.
However, as the above new materials having a thin coating have been more and more widely used, strong demands for improving the rust resistance of these thinly coated new materials have been made from can manufacturers as well as canning and related industries who had long been accustomed to the usage and properties of electro-tin-plates having #25 or higher tin coatings and TFS.
In order to meet the strong demand from these related industries the present inventors have conducted extensive studies and experiments and found how to of substantially improve the rust resistance without increasing the production cost
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Metal Working 
