Page 395 - Pipelines and Risers

Use of High Strength Steel 363

Additions of molybdenum, copper and nickel to the MnNbTi alloy system enables the
strength level to be raised to that of grade XlOO when the steel is processed to plate by
thermomechanical rolling and accelerated cooling.

5
1965
1970
1990
1995
2000
1975
1980
1985
NOTE:
TM - THERMOMECHANICAL

Figure 19.1 Development in linepipe steels.

Trends in the development of sour service grades and high strength grades towards the year
2000, may be viewed in Figures 19.2 and 19.3 (Hillenbrand et al. (1995)). The material
‘property pentagram’ developed, based on 1992 expectations, is shown in Figure 19.2. The
figure shows that the development of a high strength steel is governed by factors different
from those for a HIC-resistant steel. The pentagram has been subsequently modified based on
1995 expectations and is shown in Figure 19.3.