Patent ID: 7048810
Filing Date: 2006-05-23
Classification: C21D,Y10S

Abstract:
1. A method of hot forming high strength steel, said high strength steel having a yield strength of at least 689 MPA (100 ksi) to produce a hot formed component with a toughness as measured by Charpy-V-Notch impact test at −40° C. of at least about 120 joules (90 ft-lbs), said method comprising: a) heating said high strength steel to at least about 700° C. and no more than about 1100° C.; b) hot forming said high strength steel to produce a desired hot formed component, wherein said desired hot formed component comprises non-regular shaped pieces of pipe that are adapted to provide at least one of a change in pipeline direction, a coupling of different diameter pipes, splitting of the pipeline into two directions and any combination thereof; c) quenching said high strength steel component after hot forming at a rate greater than about 10° C./s to a quench stop temperature lower than about 450° C.