Surface-treated steel plate, fuel pipe, cell can

[0057] As a base, a steel sheet obtained by annealing a cold-rolled sheet (0.25 mm in thickness) of low-carbon aluminum-killed steel having the chemical composition shown below was prepared.

[0058] C: 0.045% by weight, Mn: 0.23% by weight, Si: 0.02% by weight, P: 0.012% by weight, S: 0.009% by weight, Al: 0.063% by weight, N: 0.0036% by weight, remainder: Fe and unavoidable Impurities

[0059] Then, the prepared steel sheet was subjected to alkaline electrolytic degreasing and acid pickling by immersion in sulfuric acid, and then nickel plating was performed under the following conditions to form a nickel plating layer with a thickness of 0.5 μm.

[0060] Bath composition: nickel sulfate 250g / L, nickel chloride 45g / L, boric acid 30g / L

[0061] pH: 3~4.8

[0062] Bath temperature: 60°C

[0063] Current density: 10A / dm 2

[0064] Next, heat-treat the steel plate with the nickel coating for two hours at a temperature of 650°C and a non-oxidizing atmosphere (vacuum annealin...

[0066] A surface-treated steel sheet was produced in the same manner as in Example 1 except that the heat treatment time was changed to 4 hours and evaluated in the same manner. The results are shown in Table 1.

[0068] A surface-treated steel sheet was produced in the same manner as in Example 2 except that the thickness of the nickel plating layer was 1 μm, and was evaluated in the same manner. The results are shown in Table 1.