C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/31
C21D 8/00 (2006.01) C21D 8/02 (2006.01) C22C 38/04 (2006.01)
Patent
CA 1208106
ABSTRACT OF THE DISCLOSURE Due to increasing demands for steel to be used for construction such as buildings, pressure vessels, pipe lines or the like, various kinds of high tension steels, particularly steels suitable for welding have increasingly been developed. Heretofore, proposed methods of making such high tension steel have relied on so-called cold rolling and/or rolling followed by quenching and tempering, however, these conventional steels have suffered from drawbacks such as a tempering step indispensable after quenching, softening of welded zone and lack of uniformity in the metal structure in the direction of plate thickness. A compositional feature of the new method resides in addition of minor amounts of Ti and B along with Nb as contributing to grain refining or precipitation hardening elements in addition to limited amounts of other ingredients such as C, Si, Mn, S, Al and N. Further addition of at least one of V, Ni, Cu, Cr, Mo, Ca and REM also acts to improve the properties of the steel. The steel prepared to have the aforesaid composition is subjected to controlled heating, subse- quent rolling under prescribed rolling reduction ratio, temperature for terminating rolling and to a specified cooling rate. The steel plate thus processed has a structure having fine bainite grains alone or a duplex grain
412681
Mazuda Hiroo
Ohashi Mamoru
Onoe Yasumitsu
Tamehiro Hiroshi
Gowling Lafleur Henderson Llp
Nippon Steel Corporation
LandOfFree
Method of making wrought high tension steel having superior... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making wrought high tension steel having superior..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making wrought high tension steel having superior... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1244174