STAINLESS STEEL, ITS PRODUCTION METHOD, AND SOLDERING APPARATUS USING STAINLESS STEEL

Title:

STAINLESS STEEL, ITS PRODUCTION METHOD, AND SOLDERING APPARATUS USING STAINLESS STEEL

Document Type and Number:

Japanese Patent JP2007131921

Kind Code:

A

Abstract:

To provide a stainless steel or the like whose corrosion resistance to lead-free solder is improved.

The stainless steel 10 has corrosion resistance to lead-free solder, and comprises: a nitriding reformed layer 12 formed on the surface of an austenitic stainless steel body 11, further comprising no chromium nitride and comprising nitrogen and chromium as solid solutions; and a passive film 13 formed on the surface of the nitriding reformed layer 12 with nitric acid. The passive film 13 is made of chromium oxide. The passive film 13 has excellent corrosion resistance, thus functions as a protective film to lead-free solder. The thickness of the nitriding reformed layer 12 is, e.g., 5 to 15 μm. The thickness of the passive film 13 is, e.g., ≥10 nm.

Inventors:

OKANO TERUO
IIJIMA MASAKI
YOSHIDA SHUNICHI

Application Number:

JP2005326861A

Publication Date:

May 31, 2007

Filing Date:

November 11, 2005

Export Citation:

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Assignee:

TAMURA SEISAKUSHO KK
TAMURA FA SYSTEM CO LTD

International Classes:

C23C28/04; B23K3/06; C21D1/06; C21D1/76; C21D6/00; C22C38/00; C23C8/10; C23C8/26; C23C8/42; B23K101/42

Domestic Patent References:

JPS61195988A	1986-08-30
JP2001335957A	2001-12-07
JP2001214256A	2001-08-07

Foreign References:

WO2005093115A1

2005-10-06

Attorney, Agent or Firm:

Isamu Takahashi

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