Method for continuously quenching electrolytic tin-plated steel strip

passing said strip into said quenching tank containing said quenching liquid, and

• 3. maintaining a relatively higher quenching rate of from 1,100.degree. to 1,300.degree. C. per second by spraying a larger quantity of quenching liquid of at least 1.2 liters per square meter per minute under a high
• pressure onto said strip beneath said surface in said quenching tank. 2. A method of continuously quenching a continuously moving electrolytic tin-plated steel strip, comprising
• 1. maintaining a relatively low quenching rate of from 500.degree. to 900.degree. C. per second by spraying a quenching liquid at high pressure along a guide plate onto a continuously moving tin-plated steel strip with its tin-plated layer fused thereto with heat, in the air above the surface of a quenching liquid maintained in a quenching tank, with a quantity of said quenching liquid of from 0.2 to 0.8 liter per square meter per minute, followed by
• 2. passing said strip into said quenching tank containing said quenching liquid, and
• 3. maintaining a relatively higher quenching rate of from 1,100.degree. to 1,300.degree. C. per second by spraying a larger quantity of quenching liquid of at least 1.2 liters per square meter per minute under a high pressure onto said strip beneath said surface in said quenching tank.

A method of continuously quenching a continuously moving electrolytic tin-plated steel strip, comprising:

• moving said strip in a substantially vertical direction through the atmosphere;
• spraying a first quantity of a quenching liquid mist towards said strip from both sides thereof and at substantially the same horizontal level, said spraying being directed at an angle within the range between a right angle and 45.degree. in an upward direction relative to said substantially vertically moving strip;
• thereafter passing said strip in a substantially vertical direction into a quenching tank containing a quenching liquid;
• and then
• spraying a second quantity of a quenching liquid at high pressure toward said strip from both sides thereof below the surface of the quenching liquid in said quenching tank and at substantially the same horizontal level below the surface of the quenching liquid in said quenching tank, said high-pressure spraying being directed at an angle within the range between a right angle and 45.degree. in an upward direction relative to said substantially vertically moving strip, said second quantity of quenching liquid being greater than said first quantity.

A method of continuously quenching a continuously moving electrolytic tin-plated steel strip, comprising:

• moving said strip in a substantially vertical direction through said atmosphere between at least a pair of guide plates;
• spraying a first quantity of high-pressure quenching liquid toward said strip from both sides thereof and at substantially the same horizontal level, said spraying being directed at an angle within the range between an upwardly directed parallel direction and 45.degree. in an upward direction relative to said substantially vertically moving strip, at least a portion of said high-pressure quenching liquid spray being directed toward said guide plates;
• deflecting with said guide plates said portion of said high-pressure quenching liquid spray directed thereon toward said strip, the uppermost part of said guide plates being curved toward said strip, the curved uppermost parts ending substantially at the same horizontal level;
• thereafter passing said strip in a substantially vertical direction into a quenching tank containing a quenching liquid;
• and then
• spraying a second quantity of a high-pressure quenching liquid toward said strip from both sides thereof below the surface of the quenching liquid in said quenching tank and at substantially the same horizontal level below the surface of the quenching liquid in said quenching tank, said high-pressure spraying being directed at an angle within the range between a right angle and 45.degree. in an upward direction relative to said substantially vertically moving strip, and said second quantity being greater than said first quantity.