Title:
MANUFACTURE OF CR-NI BASE STAINLESS STEEL ALLOY WITHOUT GENERATING SURFACE FLAW
Document Type and Number:
Japanese Patent JP2838467
Kind Code:
B2
Abstract:
PURPOSE: To prevent fine crack to become scab in a manufacturing method of Cr-Ni base stainless steel.
CONSTITUTION: At the time of continuously casting stainless steel which essentially consists of 16-35% Cr and 7-50% Ni and δ (cal) is ≤8, this method is composed of making the shape of slab so that thickness in the edge parts are thicker than that in the middle part of width, heating a slab cooled at a cooling rate of ≤30°C/sec between 1400°C and 1200°C and at ≥10°C between 1000°C and 500°C at 1000-Tγ°C for Kmin or more and executing hot rolling. Where, δ(cal)=3CReq-2.8Nieq-19.8, Creq=Cr+1.5Si+Mo+0.5Nb+0.5Ti, Nieq=Ni+0.5Mn+0.5Cu+30C+30N, Tγ=(105+Nieq-3.9Creq)/(0.07-0.00195Creq), K=10m(m=3.22 log{(Creq×(0.6δ(cal)+4.5)/T}+5.25).
Inventors:
ABE MASAYUKI
TAKESHITA TETSUO
YAMADA KENJI
SUZUKI SHIGERU
TAKESHITA TETSUO
YAMADA KENJI
SUZUKI SHIGERU
Application Number:
JP9467993A
Publication Date:
December 16, 1998
Filing Date:
April 21, 1993
Export Citation:
Assignee:
SHINNIPPON SEITETSU KK
International Classes:
B21B1/46; B21B1/26; B21B3/02; C21D8/00; C21D9/00; C21D9/46; C22C38/00; C22C38/50; (IPC1-7): B21B3/02; B21B1/26; C21D8/00; C21D9/00; C21D9/46
Domestic Patent References:
| JP255604A | ||||
| JP339420A |
Attorney, Agent or Firm:
Kazuo Ozeki
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