Title:
MANUFACTURE OF SEAMLESS STEEL PIPE
Document Type and Number:
Japanese Patent JPS59182920
Kind Code:
A
Abstract:
A seamless steel pipe having particularly fine grain structure is produced using steel of the following composition:- 0.02 - 0.12 % Carbon, 1.3 - 2.2 % Manganese, 0.001 - 0.01 % Sulphur, 0.01 - 0.04 % Titanium, 0.02 - 0.06 % Niobium, 0.003 - 0.008 % Nitrogen, 0.03 - 0.05 % Aluminium, the remainder being iron, unavoidable impurities and individually or in any combination with themselves or the iron:- up to 0.3 % Molybdenum, up to 0.5 % Nickel, 0.001 - 0.003 % Boron, The production method comprises heating a rolled or continuously cast rod to a drawing temperature of 1150 to 1220 DEG C; pre-forming in one or more production stages to an hollow body with substantially the finished wall thickness; reheating the body for 5 to 20 minutes at 700 to 850 DEG C; longitudinal rolling to the finished pipe dimensions; and subsequent cooling.
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Inventors:
MIKAERU GUREEFU
INGO FUON HAAGEN
DEIITAA FUESUPERUMAN
INGO FUON HAAGEN
DEIITAA FUESUPERUMAN
Application Number:
JP6049284A
Publication Date:
October 17, 1984
Filing Date:
March 28, 1984
Export Citation:
Assignee:
MANNESMANN AG
International Classes:
C21D8/10; C22C38/00; C22C38/04; B21B19/02; (IPC1-7): B21B19/02; C21D8/10; C22C38/14
Attorney, Agent or Firm:
Okuyama Nao