Method of making wrought high tension steel having superior low

Metal treatment – Compositions – Heat treating

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

148 124, C21D 802

Patent

active

045212589

ABSTRACT:
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, subsequent 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 structure consisting of fine bainite and fine ferrite particularly finer toward the surface so as to satisfy both ductility and toughness without tempering operation and displays good weldability and toughness even at a welded zone as well as stable hardness distribution throughout the plate thickness.

REFERENCES:
patent: 4219371 (1980-08-01), Nakasugi et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method of making wrought high tension steel having superior low 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 low , 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 low will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-827249

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.