Jfe Steel Corporation

Keiichiro Kishi

Yoshihiro Yazawa

Tomoyuki Yokota

Kimihiro Nishimura

Shinji Mitao

Yota Kuronuma

Hitoshi Sueyoshi

Shunichi Tachibana

Toshiyuki Hoshino

Disclosed is a manufacturing method for a seawater-resistant stainless clad steel including a cladding material made of stainless steel having a pitting index represented by Cr[mas %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a &#x3c3; phase. The method including the steps of performing a mechanical treatment from at least one of grindstone polishing and belt polishing and performing at least one of an electrolytic treatment in acid solutions or in neutral salt solutions, and a pickling treatment, to manufacture the stainless clad steel having dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction, determined in accordance with JIS K 7125, both of 0.05 or less.

Seawater-resistant stainless clad steel

A cladding material for stainless steel clad steel plate, includes, by mass %, 0.03% or less carbon, 1.5% or less silicon, 2.0% or less manganese, 0.04% or less phosphorus, 0.03% or less sulfur, 22.0% to 25.0% nickel, 21.0% to 25.0% chromium, 2.0% to 5.0% molybdenum, 0.15% to 0.25% nitrogen, and the balance being iron and incidental impurities, wherein critical pitting temperature (CPT) after normalization as determined in accordance with ASTM G48-03 Method E is 45&#xb0; C. or higher, and corrosion loss at a welded zone as determined by a corrosion test in accordance with NORSOK Standard M-601 is 1.0 g/mor less.

Stainless steel clad steel plate including cladding material for stainless steel clad steel plate and method of manufacturing the same

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Fukuyama, Japan

Keiichiro Kishi