Heat-resistant austenitic stainless steel sheet

Patent metadata

Field	Value
Publication number	US-2015083283-A1
Application number	US-201314387114-A
Country	US
Kind code	A1
Filing date	Mar 28, 2013
Priority date	Mar 30, 2012
Publication date	Mar 26, 2015
Grant date	—

Abstract

The present invention is directed to a heat-resistant austenitic stainless steel sheet comprising, by mass %, C: 0.03% to 0.06%, N: 0.1% to 0.3%, Si: 1% or less Mn: 3% or less, P: 0.04% or less, S: 0.03% or less, Ni: 5 to 12%, Cr: 15 to 20%, Al: 0.01% to 0.1%, Nb: 0.05% to 0.3%, V: 0.05% to 0.30%, Ti: 0.03% or less, (Nb+V)/(C+N):2 or less and further a balance of Fe and unavoidable impurities, and wherein an amount of precipitates mainly comprised of carbonitrides is 1% or less.

First claim

1 . A heat-resistant austenitic stainless steel sheet comprising, by mass %,
C: 0.03% to 0.06%,
N: 0.1% to 0.3%,
Si: 1% or less,
Mn: 3% or less,
P: 0.04% or less,
S: 0.03% or less,
Ni: 5 to 12%,
Cr: 15 to 20%,
Al: 0.01% to 0.1%,
Nb: 0.05% to 0.3%,
V: 0.05% to 0.30%,
Ti: 0.03% or less,
(Nb+V)/(C+N): 2 or less and further
a balance of Fe and unavoidable impurities, and wherein an amount of precipitates mainly comprised of carbonitrides is 1% or less.

2 . The heat-resistant austenitic stainless steel sheet according to claim 1 , further comprising one or two or more of Cu: 1% or less, Mo: 3% or less, W: 3% or less, Co: 1% or less, and B: 0.01% or less.

3 . A method of production of heat-resistant austenitic stainless steel sheet according to claim 1 , the method comprising the steps of: steelmaking; hot rolling; pickling; cold rolling; annealing; and pickling, wherein heating temperature of hot rolling is 1200° C. to 1300° C. and final annealing temperature is 1100° C. to 1200° C.

4 . A method of production of heat-resistant austenitic stainless steel sheet according to claim 2 , the method comprising the steps of: steelmaking; hot rolling; pickling; cold rolling; annealing; and pickling, wherein heating temperature of hot rolling is 1200° C. to 1300° C. and final annealing temperature is 1100° C. to 1200° C.

Assignees

• Nippon Steel & Sumikin Sst

Inventors

• Inoue Yoshiharu
• Fudanoki Fumio
• Hamada Junichi

Classifications

• C21D8/0263

  following hot rolling · CPC title

• C21D2211/004

  Dispersions; Precipitations · CPC title

• C21D9/46

  for sheet metals · CPC title

• C22C38/06

  containing aluminium · CPC title

• C21D2211/001

  Austenite · CPC title