Honda Giken Kogyo Kabushiki Kaisha

Teruoki Watanabe

Shunji Kobayashi

Akio Hidaka

Tadao Kanno

Hiroyoshi Nozaki

Kazunori Sakamoto

Yahiko Nakamura

Yasuo Nakanishi

Giichi Ando

A paint priming method which forms, on the surface part of a ferrous material to be treated, a nitride layer with an adequate depth and preferably .epsilon. phase as a main phase thereof, and with no carbon adhesion to the surface thereof, by carrying out a gas soft nitriding treatment with gas components which generate no free carbon. The nitride layer formed on the surface part of the material is used as a presubstrate on which direct painting is possible, thereby providing a simplified and improved presubstrate treatment for painting.

Method of presubstrate treatment for painting utilizing a gas soft

A process and apparatus for heat treatment of a steel article made of soft steel or the like comprising heating the steel article to a brazing temperature of 1100.degree.-1200.degree. C., then cooling the steel article in a furnace to a temperature of about 570.degree.-720.degree. C., and thereafter rapidly cooling the article. The article is heated to brazing temperature in an oxidation-free atmosphere and is also cooled in an oxidation-free atmosphere. The article can be rapidly cooled by contact with a surface pretreatment solution.

Process and apparatus for heat treatment of steel material such as of

A method for continuously treating an iron member wherein the iron member is first subjected to furnace-brazing in a controlled gas environment and subsequently to a soft-nitriding treatment by addition of ammonia gas (NH.sub.3) to the controlled gas for the brazing. An apparatus for carrying out the method is also provided, and includes three partitioned chambers for brazing, annealing and soft-nitriding the iron member, each chamber being partitioned by a member such as a stainless steel film curtain at opposite sides thereof. A controlled gas feed system communicates with each of the chambers, and an ammonia gas feed system is connected to the soft-nitriding chamber.

Method and apparatus for the continuous furnace brazing and gas

A gas soft-nitriding method which comprises a step of subjecting iron parts to a gas soft-nitriding treatment in a heat treating furnace at a temperature of approximately 550.degree. C.-620.degree. C. in a mixed atmosphere which comprises, when introduced into the furnace, 10%-30% ammonia gas, 2.5%-4.5% total carbon monoxide, and a balance of N.sub.2 gas or an exothermic gas on a volume basis. Thereby, the iron parts are provided with superior fatigue and wear resistance qualities, while production costs and the cost of the treated parts are substantially reduced.

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Kawagoe, Japan

Teruoki Watanabe