The Effects of Vanadium on the Parent Plate and Weldment Properties of Accelerated Cooled API 5LX100 Steels
Abstract:
The effects ofrolling schedule, finish rolling temperature, cooling rate through the transformation and vanadium level, with and without an addition of0.25%Mo, on the properties of 15mm thick, accelerated cooled, plate of base composition 0.08%C/1.85%Mn/0.45%Si/0.05%Nb/Cu, Ni, Ti have been determined.
It has been demonstrated that plate of yield strength lOOksi, with> 170J Charpy vee-notch energy absorption at -20°C, coupled with an 85% BDWTT transition temperature <-20°C, can be obtained using steel containing 0.08%V + 0.25%Mo, rolled by a schedule incorporating 20-21 % deformation/pass in the temperature range 850-800°C, to finish rolling at 800°C, followed by cooling between 800 and 550°C at a rate exceeding 30°C/sec.
In expanded pipe, scope exists to reduce the vanadium level and cooling rate required for achievement of tensile properties. An initial examination of the weldability, based on simulation of the longitudinal weld, indicates a satisfactory level of HAZ toughness, particularly in steel containing 0.08%V + 0.25%Mo. In addition, the preheating requirements for field welding-appear to be similar to, but slightly higher than, those of existing API 5LX-80 steels.
Keywords:
vanadium, pipeline steel.
Author:
P. S. Mitchell
Affiiation
Vanitec
PDF:
Source:
Proceedings of the 2nd International Pipeline Technology Conference, Ostend, Belgium, September 11-14, 1995, pp.239-251 (Vanitec Publication - V0395)
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