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

Patent metadata

Field	Value
Publication number	US-10207477-B2
Application number	US-201314396256-A
Country	US
Kind code	B2
Filing date	Apr 19, 2013
Priority date	Apr 25, 2012
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

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° 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/m 2 or less.

First claim

The invention claimed is:

1. A stainless steel clad steel plate comprising the cladding material for stainless steel clad steel plate, consisting of, 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, optionally 0.0010% to 0.0055% boron, and the balance being iron and incidental impurities, wherein the critical pitting temperature (CPT) after normalization as determined in accordance with ASTM G48-03 Method E is 45° C. or higher, and the corrosion loss at a welded zone as determined by a corrosion test in accordance with NORSOK Standard M-601 is 1.0 g/m 2 or less, and a carbon steel or a low-alloy steel as a base material, and having a total thickness of 30 to 100 mm.

2. The stainless steel clad steel plate according to claim 1 , wherein an area percentage of σ (sigma) phase precipitated in a surface of the cladding material is 2.0% or less.

3. The stainless steel clad steel plate according to claim 1 , wherein the cladding material precipitates extracted from the cladding material by constant-current electrolysis with 10% by volume acetylacetone-1% by mass tetramethylammonium chloride-methanol contain a chromium content of 0.5% by mass or less and molybdenum content of 0.3% by mass or less.

4. The stainless steel clad steel plate according to claim 3 , wherein an area percentage of a phase precipitated in a surface of the cladding material is 2.0% or less.

5. A method of manufacturing the stainless steel clad steel plate according to claim 1 , comprising hot rolling with a sacrificial material at a reduction ratio of 5 or more and then normalizing by heating to 850° C. to 950° C. and air cooling.

Assignees

• Jfe Steel Corp

Inventors

• Kishi Keiichiro
• Yazawa Yoshihiro
• Tachibana Shunichi
• Kuronuma Yota
• Hoshino Toshiyuki

Classifications

• C22C38/02

  containing silicon · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• Y10T428/12972

  Containing 0.01-1.7% carbon [i.e., steel] · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• B32B15/011 Primary

  all layers being formed of iron alloys or steels · CPC title