Method of surface treating steel products with metal powder

Claim 1

The method according to claim 1, wherein said preheating is effected in an oxidizing atmosphere.

Claim 3

A method of surface treatment of a steel stock characterized by the steps of applying an aqueous slurry on the surface of said steel stock, said slurry consisting of water and a mixture of metal particles suspended therein, the mixture consisting of metal particles (i) having a mean particle size of less than 10 microns and metal particles (ii) having a mean particle size of from 10 to 100 microns and the maximum percentage of said particles (ii) in said mixture being represented by the factor -4/9X + 104.5 percent wherein X represents the particle size of said particles (ii), preheating the coated steel stock at a temperature of 400* to 700* C., rolling the coated steel stock at a reduction rate of 2 to 5 percent to cause said metal powder to adhere to the surface of steel stock and post-heating said coated steel stock at a temperature ranging from 300* to 700* C., to form a stel product coated with an adhered layer of said metal powder, said metal being selected from the group consisting of aluminum, zinc, lead, tin and titanium.

Claim 6

A method of surface treatment of a steel product with a metal powder characterized by the steps of applying an aqueous slurry on the surface of said steel product, said slurry consisting of water, a metal powder having a particle size of less than 325 mesh suspended therein and a small quantity, sufficient to stabilize said slurry and to inhibit corrosion, of phytic Acid, preheating the coated steel product at a temperature of 400* to 700* C., rolling the coated steel product at a reduction rate of 2 to 5 percent to cause said metal powder to adhere to the surface of said steel product, and post-heating the resulting steel product at a temperature ranging from 300* to 700* C., said metal being selected from the group consisting of aluminum, zinc, lead, tin and titanium.

Claim 9

A method of surface treatment of a steel stock characterized by the steps of applying an aqueous slurry on the surface of said steel stock, said slurry consisting of water, a mixture of metal particles suspended therein, and a small quantity, sufficient to stabilize said slurry and to inhibit corrosion, of phytic acid, the mixture consisting of metal particles (i) having a mean particle size of less than 10 microns and metal particles (ii) having a mean particle size of from 10 to 100 microns and the maximum percentage of said particles (ii) in said mixture being represented by the factor -4/9X + 104.5 percent wherein X represents the particle size of said particles (ii), preheating the coated steel stock at a temperature of 400* to 700* C., rolling the coated steel stock at a reduction rate of 2 to 5 percent to cause said metal powder to adhere to the surface of steel stock and post-heating said coated steel stock at a temperature ranging from 300* to 700* C., to form a steel product coated with an adhered layer of said metal powder, said metal being selected from the group consisting of aluminum, zinc, lead, tin and titanium.