Coating processes – Interior of hollow article coating – Metal base
Patent
1992-11-30
1994-05-03
Lusignan, Michael
Coating processes
Interior of hollow article coating
Metal base
252 25, 252 347, 252 466, 252 486, 427327, 427384, 4273881, 427409, B05D 722
Patent
active
053086546
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lubrication treatment method which is especially well adapted for the production of smooth steel tubing with a metallic luster by the cold drawing of carbon steel tubing, for example, pickled steel tubing, bright annealed tubing, and seam welded tubing.
BACKGROUND ART
A pretreatment widely employed prior to the cold drawing of carbon steel tubing consists of the formation of a phosphate conversion film on the surface of the steel tubing followed by the formation of a lubricating film on the phosphate conversion film through the application of, inter alia, a metal soap solution. A problem associated with this technique is that a portion of the phosphate and metal soap adheres as scale on the surface of the steel tubing after the cold-drawing operation, and this serves to diminish the steel tubing's metallic luster.
According to Japanese Patent Application Laid Open [Kokai or Unexamined] Number 63-215797 [215,797/88], drawn steel tubing with an excellent metallic luster is obtained after a facile pretreatment by avoiding the use of a phosphate conversion treatment and metal soaps. Japanese Patent Application Laid Open Number 63-238921 [238,921/88] provides for the production of steel wire with an excellent metallic luster, although this art is not principally intended for the manufacture of steel tubing. However, further improvement is still desired with regard to such factors as the cross section reduction ratio and seizure resistance of tubing during cold drawing.
DESCRIPTION OF THE INVENTION
Problem to Be Solved by the Invention
It is desired that the pretreatment used for steel tubing in a cold drawing operation be characterized by little seizure at the die, plug, etc., even for cold drawing at high cross section reduction ratios. The present invention thus takes as its object the introduction of a lubrication treatment method for steel tubing which not only supports the production of drawn steel tubing with an excellent metallic luster, but which also is associated with less seizure at the die or plug than in Japanese Patent Application Laid Open Numbers 63-215797 and 63-23892 1, even for cold drawing at high cross section reduction ratios.
SUMMARY OF THE INVENTION
The present invention comprises a method for the lubricating treatment of steel tubing, said method being characterized by contacting carbon steel tubing, prior to its cold drawing, with a colloidal titanium containing liquid composition which has a pH of 8 to 11 and which contains from 0.001 to 0.5 grams per liter ("g/L"), measured as titanium, of a colloidal titanium containing material formed as the product of reaction in solution between a water soluble titanium containing compound and a water soluble alkaline phosphate, thereafter drying the carbon steel tubing, and then applying a liquid lubricating composition on the surface of the carbon steel tubing thus treated, wherein said liquid lubricating composition has a viscosity at 20.degree. C. in the range from 100 to 3,000 centipoises and comprises, or preferably consists essentially of:
(A) from 40 to 95% (all percent numbers here and below being percents by weight) of a first component selected from the group consisting of olefin/oil or olefin/fat compounds which contain from 23 to 30% of sulfur and olefin/higher ester compounds which contain from 23 to 30% sulfur, including mixtures of two or more chemical species meeting this description; and
(B) from 5 to 50% of a second component selected from the group consisting of oil soluble polymer compounds, fats and oils, synthetic oils, mineral oils, higher fatty acids, and the amine salts of higher fatty acids; and, optionally,
(C) a phosphorus containing extreme pressure additive;
(D) dispersed solid lubricant; and
(E) surfactants.
DETAILS OF PREFERRED EMBODIMENTS OF THE INVENTION
The colloidal titanium containing liquid composition used in the present invention may be and preferably is the same type of composition as is used in the prior art for "activating" active metal
REFERENCES:
patent: 3258319 (1966-06-01), Cox
patent: 3481762 (1969-12-01), Streicher
patent: 4287741 (1981-09-01), Peters et al.
Hetsugi Koji
Kaburagi Koji
Nagae Yoshio
Henkel Corporation
Jaeschke Wayne C.
Lusignan Michael
Szoke Ernest G.
Wisdom, Jr. Norvell E.
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