Nippon Kokan Kabushiki Kaisha

Nihon Parkerizing Co., Ltd.

Parker Chemical Company

Sakae Sonoda

Osamu Furuyama

Shoji Okamoto

Ryoichiro Takahashi

Hiroshi Kuwamoto

Shuichi Iwado

Shoji Shimada

Kouji Kaburagi

Takeru Sharyo

Koji Kaburagi

Kimio Yokoyama

Kaoru Shiraishi

Masaaki Watanabe

Seishi Kano

Yoshio Nagae

Eisuke Tohmata

Toshitake Katayama

In the cold rolling oils for steel sheets of the present invention, when 0.2-5% by weight of a high molecular nonionic surfactant having a molecular weight of 2000-15000 and an HLB value of 5-9, as well as 0.2-5% by weight of another nonionic surfactant having 12-16 HLB value, are incorporated with a cold rolling oil as emulsifying and dispersing agents, anti-coalescence of oil particles emulsified and dispersed are remarkably improved, and they are less affected by inclusion of iron powder so that excellent stability with time in an emulsified and dispersed state is obtained, as well as that its plateout is significantly improved. Further, the concentration of the resulting cold rolling oils does not decrease, even in case of weak stirring force, so that stable performance with time are obtained. In addition, when 0.1-10% by weight of an acetylene glycol nonionic surfactant is further incorporated with the above-described cold rolling oils for steel sheets of the invention, adverse effects due to inclusion of iron powder are safely avoided.

Cold rolling oil for steel sheet

The present invention provides a cold rolling oil for steel sheets characterized by incorporating various rolling oils with oil-soluble high-molecular compounds which are obtained by salt-forming:

In this invention provided are cold rolling oils for steel sheets which are applied for cold rolling of steel sheets and have excellent lubricity, lubrication stability, and fresh oil replenishing property.

Iron and steel articles to be subjected to a cold forming operation are treated with a phosphatizing solution to form a zinc phosphate film on the surface, which film contains from about 5 to 80% by weight of the total film of zinc calcium phosphate. Thereafter, a soap type lubricant coating is applied to the zinc phosphate film. Preferably, the zinc phosphate film is formed on the surface by treating it with a phosphatizing solution which comprises from about 0.1 to about 0.35% by weight calcium ion, from about 0.1 to about 1.5% by weight zinc ion, from about 0.5 to about 3.0% by weight PO.sub.4, and from about 3.0 to about 5.0% by weight nitrate ion, which solution has a weight ratio of calcium ions:zinc ions of about 0.1-1.0:1 and a weight ratio of nitrate ions:PO.sub.4 of about 1.0-5.0:1. One or more of nickel, copper or cobalt ions may also be included in the phosphatizing solution in a total amount of from about 0.01 to about 0.2% by weight of the solution.

Process for the cold forming of iron and steel

A cleaning method for steel plates is disclosed for removing rolling oil and metal powders by spraying highly pressurized cleaning solution on both surfaces of strip steel plates immediately before and/or after the final step in the cold-rolling process of the strip steel plates. The cleaning may be performed with efficiency by mixing abrasive grains, a rust inhibitor, a surface active agent or the like in the cleaning solution.

Method for cold rolling and cleaning steel plates

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Yokohama, Japan

Sakae Sonoda