Title:
【発明の名称】耐食性および溶接性に優れた鋼材および鋼管の製造方法
Document Type and Number:
Japanese Patent JP3226278
Kind Code:
B2
Abstract:
A steel material and a steel pipe each exhibiting an excellent corrosion resistance in an environment containing a wet carbon dioxide and a small amount of hydrogen sulfide are produced at low cost and with high productivity, a steel slab which contains, in wt%, 0.01 to 0.6% of Si, 0.02 to 1.8% of Mn, 7.5 to 14.0% of Cr, 1.5 to 4.0% of Cu and 0.005 to 0.1% of A l , which reduces C to not more than 0.02%, N to not more than 0.02%, P to not more than 0.025% and S to not more than 0.01%, and whose balance consists of Fe and unavoidable impurities, is heated to a temperature of 1,100 to 1,300 DEG C, hot rolling is finished at a rolling finish temperature of not less than 800 DEG C and a cumulative rolling reduction quantity at a temperature not more than 1,050 DEG C is at least 65%, and cooling is carried out at a cooling rate of less than 0.02 DEG C/sec to at least 500 DEG C so as to substantially convert the metallic structure to ferrite.
Inventors:
Akihiro Miyasaka
Masaaki Kobatake
Suguru Motoyoshi
Masaaki Kobatake
Suguru Motoyoshi
Application Number:
JP50489496A
Publication Date:
November 05, 2001
Filing Date:
July 18, 1995
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C21D8/00; C21D8/10; C22C38/20; (IPC1-7): C21D8/00; C21D8/10; C22C38/00; C22C38/38; C22C38/58
Domestic Patent References:
| JP2236225A | ||||
| JP6256517A | ||||
| JP2217444A | ||||
| JP5735634A | ||||
| JP1123024A | ||||
| JP4191319A |
Attorney, Agent or Firm:
Takashi Ishida (3 others)
Previous Patent: 中間ウィンドウを有するニアアイディスプレイ
Next Patent: MACHINING METHOD OF OSCILLATOR IN OSCILLATION WAVE MOTOR
Next Patent: MACHINING METHOD OF OSCILLATOR IN OSCILLATION WAVE MOTOR