C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34
C21D 8/00 (2006.01) B21B 17/14 (2006.01) C21D 8/10 (2006.01)
Patent
CA 1072864
ABSTRACT OF THE DISCLOSURE A molten steel, which may optionally contain boron to increase hardenability is poured into ingot molds, bloomed and primary hot worked to a mother tube of intermediate cross-section. Before cooled down below about 800°C., the mother tube is reheat- ed to about 930°C., removed of scale from the outside surface thereof, secondary hot worked to a pipe of final dimensions with a reduction, measured in terms of equivalent strain as expressed by the following formula, of not less than .epsilon. = 0.02 for removal of scale from the inside surface of the pipe, and then directly quenched to produce a finished seamless steel pipe having far better shape at a higher heat efficiency than in the conventional process. Better toughness is effected when the degree of second- ary hot work is not smaller than .epsilon. = 0.20. Image
264600
Itoh Kametaro
Kato Osamu
Kawauchi Nobuyuki
Ueno Masakatsu
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