F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 9/02 (2006.01) B62D 29/00 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01)
Patent
CA 2056212
An automobile body reinforcing steel pipe having a wall thickness-to-outer diameter ratio, t/D, defined by: 0.09 - 4.8 x 10-5 x L ? t/D ? 0.16 - 6.0 x 10-5 x L where L(mm) is a span of a bending load applied to the pipe. The pipe has a tensile strength of 120 kgf/mm2 or more and an elongation of 10% or more, and is preferably made of a steel consisting of 0.15 - 0.25 wt% C, 1.8 wt% or less Mn, 0.5 wt% or less Si, 0.04 wt% or less Ti, 0.0003 - 0.0035 wt% B, and the balance of Fe and unavoidable impurities including 0.0080 wt% or less N. A process for producing the steel pipe comprises: coiling a hot rolled steel sheet at a temperature of 600°C or higher; electric welding the adjoining edges of the sheet to form a steel pipe; and quench hardening the pipe.
Tanabe Hiroto
Yamazaki Kazumasa
Goudreau Gage Dubuc
Nippon Steel Corporation
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