Title:
METHOD FOR ROLLING/DRAWING NICKEL-FREE HIGH-NITROGEN STAINLESS STEEL MATERIAL, NICKEL-FREE HIGH-NITROGEN STAINLESS STEEL SEAMLESS THIN PIPE, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/081144
Kind Code:
A1
Abstract:
This method for rolling/drawing a nickel-free high-nitrogen stainless steel material comprises: an intermediate annealing step (S11) wherein a nickel-free high-nitrogen stainless steel material composed of a fine grain structure having a maximum crystal grain size of 30 μm or less is annealed at a temperature from 900°C to 1,000°C (inclusive) and then air cooled to room temperature; a rolling/drawing step (S12) wherein the nickel-free high-nitrogen stainless steel material is drawn, while reducing the thickness or the diameter of the nickel-free high-nitrogen stainless steel material; and a final solution treatment step (S13) wherein the nickel-free high-nitrogen stainless steel material is heated to a temperature from 1,200°C to 1,400°C (inclusive) and then air cooled to room temperature. A seamless thin pipe (10) for nickel-free high-nitrogen stainless steel stents is obtained by subjecting a nickel-free high-nitrogen stainless steel pipe stock, which is composed of a fine grain structure (11) having a maximum crystal grain size of 30 μm or less, to plastic working according to this method for rolling/drawing a nickel-free high-nitrogen stainless steel material. This seamless thin pipe for nickel-free high-nitrogen stainless steel stents is composed of a fine grain structure that has a maximum crystal grain size of 30 μm or less.
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Inventors:
TAGUCHI TETSUSHI (JP)
KATADA YASUYUKI (JP)
KATADA YASUYUKI (JP)
Application Number:
PCT/JP2012/081186
Publication Date:
June 06, 2013
Filing Date:
November 30, 2012
Export Citation:
Assignee:
NAT INST FOR MATERIALS SCIENCE (JP)
International Classes:
B21C1/00; C21D8/10; C22C38/00; C22C38/22
Foreign References:
| JP2006316388A | 2006-11-24 | |||
| JP2006052452A | 2006-02-23 | |||
| JP2007126709A | 2007-05-24 | |||
| JPH03138334A | 1991-06-12 | |||
| JP4845109B2 | 2011-12-28 | |||
| JP2006316338A | 2006-11-24 |
Other References:
J. MENZEL; W. KIRSCHNER; G. STEIN: "High-nitrogen containing Ni-free austenitic steels for medical applications", ISIJ INTERNATIONAL, vol. 36-7, 1996, pages 893 - 900, XP002074520
G. STEIN; I. HUCKLENBROICH; H. FEICHTINGER: "Current and future applications of high-nitrogen steels", MATERIAL SCIENCE FORUM, vol. 318-320, 1999, pages 151 - 160, XP009049168
T. ONOMOTO; Y. TERAZAWA; T. TSUCHIYAMA; S. TAKAKI: "Effect of Grain Refinement on Tensile Properties in Fe-25Cr-1 N Alloy", ISIJ INTERNATIONAL, vol. 49-8, 2009, pages 1246 - 1252
See also references of EP 2787090A4
G. STEIN; I. HUCKLENBROICH; H. FEICHTINGER: "Current and future applications of high-nitrogen steels", MATERIAL SCIENCE FORUM, vol. 318-320, 1999, pages 151 - 160, XP009049168
T. ONOMOTO; Y. TERAZAWA; T. TSUCHIYAMA; S. TAKAKI: "Effect of Grain Refinement on Tensile Properties in Fe-25Cr-1 N Alloy", ISIJ INTERNATIONAL, vol. 49-8, 2009, pages 1246 - 1252
See also references of EP 2787090A4
Attorney, Agent or Firm:
NISHIZAWA TOSHIO (JP)
Toshio Nishizawa (JP)
Toshio Nishizawa (JP)
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Claims: