Resumen
The safe transport of sour gas requires steels with enhanced hydrogen induced
cracking (HIC) resistance. Centerline segregation bands of high hardness
microconstituents and non-metallic inclusions are the heterogeneities usually linked
to HIC failures in pipeline steels. Full-scale production heats of a new low Mn, Nb
microalloyed steel were produced by different steel mills aiming at the application in
sour gas environments. The new alloy design provides both effective strengthening
and control of sulphide inclusions. Coil microstructure consisted of fine grained ferrite
with a small volume fraction of uniformly dispersed eutectoid aggregates. Most
importantly the microstructure was uniform in both the longitudinal and transverse
directions and exhibited exceptional consistency. Samples from this steel were
submitted to HIC testing according to NACE standards TM0284-2003 without any
sign of cracking. The results, so far, confirm that this new alloy design provides the
unique opportunity to economically produce a high strength pipe steel grade with
improved sour service resistance for the linepipe industry
cracking (HIC) resistance. Centerline segregation bands of high hardness
microconstituents and non-metallic inclusions are the heterogeneities usually linked
to HIC failures in pipeline steels. Full-scale production heats of a new low Mn, Nb
microalloyed steel were produced by different steel mills aiming at the application in
sour gas environments. The new alloy design provides both effective strengthening
and control of sulphide inclusions. Coil microstructure consisted of fine grained ferrite
with a small volume fraction of uniformly dispersed eutectoid aggregates. Most
importantly the microstructure was uniform in both the longitudinal and transverse
directions and exhibited exceptional consistency. Samples from this steel were
submitted to HIC testing according to NACE standards TM0284-2003 without any
sign of cracking. The results, so far, confirm that this new alloy design provides the
unique opportunity to economically produce a high strength pipe steel grade with
improved sour service resistance for the linepipe industry
| Idioma original | Inglés |
|---|---|
| Número de páginas | 13 |
| DOI | |
| Estado | Publicada - jul. 2014 |
| Publicado de forma externa | Sí |