B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
26/155, 189/47
B21C 37/06 (2006.01) C21D 9/14 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01)
Patent
CA 1189002
CLAD STEEL PIPE EXCELLENT IN CORROSION RESISTANCE AND LOW-TEMPERATURE TOUGHNESS AND METHOD FOR MANUFACTURING SAME ABSTRACT OF THE DISCLOSURE A clad steel pipe excellent in corrosion resistance and low-temperature toughness, which comprises a cladding sheet of high corrosion resistant steel and a substrate sheet of low-alloy high-strength steel, the substrate sheet consisting, as the fundamental constituents, essentially of: carbon : from 0.002 to 0.050 wt.%, silicon : from 0.05 to 0.80 wt.%, manganese : from 0.80 to 2.20 wt.%, niobium : from 0.01 to 0.10 wt.%, aluminum : from 0.01 to 0.08 wt.%, nitrogen : from 0.002 to 0.008 wt.%, and, the balance being iron and incidental impurities; or, the substrate sheet further additionally containing, as the strength-improving constituent, at least one element selected from the group consisting of: copper : from 0.05 to 1.00 wt.%, nickel : from 0.05 to 3.00 wt.%, chromium : from 0.05 to 1.00 wt.%, molybdenum : from 0.03 to 0.80 wt.%, vanadium : from 0.01 to 0.10 wt.%, and, - 1- boron : from 0.0003 to 0.0030 wt.%; or, the substrate sheet further additionally containing, as the toughness-improving constituent, titanium within the range of from 0.005 to 0.030 wt.%; the clad steel pipe being subjected to a solution treat- ment under the following conditions: heating temperature : from 900 to 1,150°C, holding period : up to 15 minutes, and, cooling rate : from 5 to 100°C/second; thereby imparting a high corrosion resistance to the cladding sheet and imparting a high low-temperature tough- ness to the substrate sheet; the clad steel pipe of this invention including a clad steel pipe which comprises the cladding sheet as the inner sheet and the substrate sheet as the outer sheet and a clad steel pipe which comprises the substrate sheet as the inner sheet and the cladding sheet as the outer sheet. - 2 -
421313
Kobayashi Yasuo
Taira Tadaaki
Takehara Junichiro
Ume Kazuyoshi
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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