Title:
PRODUCTION METHOD OF STAINLESS STEEL TUBE
Document Type and Number:
Japanese Patent JP2018035381
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a production method of a stainless steel tube containing Cr of 11.0 to less than 15.5% and having excellent toughness even having large size and thick wall.SOLUTION: The production method includes a step of hot working a steel material containing, by mass%, C:0.05% or less, Si:1.0% or less, Mn:0.05 to 2.0%, P:0.05% or less, S:0.005% or less, Cr:11.0 to less than 15.5%, Ni:4.5 to 8.0%, Mo:1.5 to 3.5%, Al:0.001 to 0.1%, N:0.001 to 0.10%, O:0.01% or less and the balance Fe with impurities to produce a tube stock having an outer diameter of 175 mm or more and a wall thickness of 10 mm or more, a step of hardening the tube stock at 800 to 1000°C, and a step of tempering the hardened tube stock, the tempering step has a step of holding the tube stock at 500 to 650°C and a step of cooling the held tube stock, the average cooling rate in a temperature range of 500 to 400°C being set to be 10°C/min. or more.SELECTED DRAWING: Figure 1
Inventors:
TOMIO YUSAKU
OTOME YOHEI
OTOME YOHEI
Application Number:
JP2016166899A
Publication Date:
March 08, 2018
Filing Date:
August 29, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
C21D9/08; C22C38/00; C22C38/58
Domestic Patent References:
| JPH11505887A | 1999-05-25 | |||
| JP2015161010A | 2015-09-07 | |||
| JPH11158551A | 1999-06-15 | |||
| JP2008231464A | 2008-10-02 | |||
| JP2002105604A | 2002-04-10 | |||
| JPH09287024A | 1997-11-04 | |||
| JP3535299B2 | 2004-06-07 | |||
| JPH05263134A | 1993-10-12 |
Foreign References:
| WO2015178022A1 | 2015-11-26 | |||
| CN102534418A | 2012-07-04 | |||
| US20160376677A1 | 2016-12-29 | |||
| CN101956146A | 2011-01-26 | |||
| CN103938124A | 2014-07-23 |
Other References:
岩渕義孝: "13Cr-Ni系鋳鋼の靱性に及ぼすNi量の影響", 鉄と鋼, vol. 70, no. 1, JPN6020013469, January 1984 (1984-01-01), JP, pages 120 - 127, ISSN: 0004251064
ステンレス協会編、ステンレス鋼便覧−第３版−, JPN6020041865, 24 January 1995 (1995-01-24), pages 104 - 107, ISSN: 0004379270
森島達明ほか２名: "配管用鋼管材料の諸問題", 圧力技術, vol. 第１０巻第４号, JPN6020041866, 1972, pages 2787 - 2794, ISSN: 0004379271
ステンレス協会編、ステンレス鋼便覧−第３版−, JPN6020041865, 24 January 1995 (1995-01-24), pages 104 - 107, ISSN: 0004379270
森島達明ほか２名: "配管用鋼管材料の諸問題", 圧力技術, vol. 第１０巻第４号, JPN6020041866, 1972, pages 2787 - 2794, ISSN: 0004379271
Attorney, Agent or Firm:
Ascend Patent Business Corporation