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Latest Inventions  Pipelines STEEL WITH HIGH RUPTURE RESISTANCE AND PROCESS OF PRODUCTION THEREOF
STEEL WITH
HIGH RUPTURE RESISTANCE AND PROCESS OF PRODUCTION THEREOF
FIELD: steelmaking.
SUBSTANCE: invention relates to production of
steel for natural gas, crude oil, etc. transportation mains, which is
characterized by high rupture resistance (about 900 MPa) and excellent impact
elasticity throughout all its thickness, and also high level of properties in
welded joints. Steal is preferably composed of, wt %: carbon 0.02-0.1, silicon
no more than 0.6, manganese 0.2-1.7, nickel 0.2-1.2, niobium 0.01-0,1, titanium
0.005-0.03, aluminum no more than 0.1, nitrogen 0.001-0.006m copper 0-0.6,
chromium 0-0.8, molybdenum 0-0.6, vanadium 0-0.1, boron 0-0.0025, and also
calcium 0-0.006. Vs value determined from equation vs=C+(Mn.5)+5P-Ni/10-Mo/15+Cu/10
is within the range from 0.15 to 0.42. P and S, being among other impurities are
contained in amounts not exceeding 0.015% and 0.003%, respectively. Size of
carbide particles contained in steel does not exceed 5 mcm in longitudinal
direction.
EFFECT: improved performance characteristics. 18
cl, 9 tbl _
KOO Dzajoung (US),
BANGARU Narasimkha-Rao V. (US), L'JuTON Majkl Dzh. (US), PETERSEN Klifford V. (US),
FUDZIVARA Kazuki (JP), OKAGUTI Sudzi (JP), KhAMADA Masakhiko (JP), KOMIZO Ju-iti
(JP)
Patent number: 2205245
Publishing date: June 17, 2003
To make the order on reception of the complete information under the invention, interesting for you
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