C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/12 (2006.01) B21B 1/26 (2006.01) B21B 3/02 (2006.01) B21C 37/08 (2006.01) C21D 8/02 (2006.01) C21D 8/10 (2006.01) C22C 38/04 (2006.01) C22C 38/08 (2006.01)
Patent
CA 2429439
The present invention provides an ultra-high- strength steel pipe excellent in weldability on site and a method for producing the steel pipe by improving the reliability of the low temperature toughness of a steel to which elements to enhance hardenability are added for furthering high-strengthening and also improving toughness at a weld heat affected zone subjected to double or more layer welding and, in the method, the steel is made to consist of a structure composed of bainite and/or martensite by containing prescribed amounts of C, Si, Mn, P, S, Ni, Mo, Nb, Ti, Al and N, and, as occasion demands, one or more of B, V, Cu, Cr, Ca, REM and Mg, and regulating C, Si, Mn, Cr, Ni, Cu, V and Mo, those being elements to enhance hardenability, by a specific relational expression. The diameter of prior austenite grains may be regulated in a prescribed range. The method includes the steps of heating a casting to a temperature not lower than the Ac3 point, hot rolling it, and thereafter cooling the resulting hot-rolled steel plate at a prescribed cooling rate.
Asahi Hitoshi
Hara Takuya
Goudreau Gage Dubuc
Nippon Steel Corporation
LandOfFree
High-strength steel excellent in low temperature toughness... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-strength steel excellent in low temperature toughness..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-strength steel excellent in low temperature toughness... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1949121