HOT-ROLLED SHAPE STEEL FOR SHIPS AND PROCESS FOR MANUFACTURING THE SAME

WIPO Patent Application WO/2009/017177

A1

A hot-rolled shape steel for ships which is manufactured by heating a bloom containing by mass C: 0.03 to 0.25%, Si: 0.05 to 0.50%, Mn: 0.1 to 2.0%, P: 0.025% or below, S: 0.01% or below, Al: 0.005 to 0.10%, W: 0.01 to 1.0%, Cr: 0.01 to less than 0.20%, and N: 0.001 to 0.008% to a temperature of 1000 to 1350°C, subjecting the resulting bloom to hot rolling wherein the cumulative rolling reduction at Ar3 or below is 10 to 80% and the rolling finishing temperature is (Ar3-30°C) to (Ar3-180°C), and then cooling the rolled steel by allowing it to stand and which has a microstructure composed of both ferrite containing worked ferrite and pearlite. Thus, a hot-rolled shape steel for ships which exhibits excellent corrosion resistance even when used in a severe corrosive atmosphere accompanied with corrosion due to seawater, e.g., ballast tanks of ships and which has strength corresponding to YP of 315MPa or above and is usable as longitudinal (lounge) or the like can be provided at a low cost.

KIMURA TATSUMI (JP)
SHIOTANI KAZUHIKO (JP)
SUZUKI SHINICHI (JP)
SHIKANAI NOBUO (JP)
KOBAYASHI KAZUTAKA (JP)

PCT/JP2008/063710

February 05, 2009

July 24, 2008

Click for automatic bibliography generation  

JFE STEEL CORP (JP)
KIMURA TATSUMI (JP)
SHIOTANI KAZUHIKO (JP)
SUZUKI SHINICHI (JP)
SHIKANAI NOBUO (JP)
KOBAYASHI KAZUTAKA (JP)

C22C38/00; B21B1/09; B21B3/00; B32B15/092; C21D8/00; C22C38/38; C22C38/60

JPH0734196A	1995-02-03
JP2002266052A	2002-09-18
JP2005325439A	2005-11-24

OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION7th floor, Yanagiya building,1-10, Nihonbashi 2-chom, Chuo-ku Tokyo 11, JP)

View/Download PDF      PDF Help

Previous Patent: ELECTRONIC DEVICE

Next Patent: METHOD OF CONTROLLING CONCENTRATION OF P-CONTAINING TREATMENT LIQUID WASTE