CHARACTERIZATION OF A NEW LOW MANGANESE, NIOBIUM MICROALLOYED STEEL FOR SOUR SERVICE

Mario González Ramírez; Neusa Alonso Falleiros; Hélio Goldenstein; Frank Barbaro

doi:10.5151/1516-392x-24781

CHARACTERIZATION OF A NEW LOW MANGANESE, NIOBIUM MICROALLOYED STEEL FOR SOUR SERVICE

Mario González Ramírez
, Neusa Alonso Falleiros
, Hélio Goldenstein
, Frank Barbaro

Universidade de São Paulo

Research output: Contribution to conference › Paper › peer-review

Abstract

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

Original language	English
Number of pages	13
DOIs	https://doi.org/10.5151/1516-392x-24781
State	Published - Jul 2014
Externally published	Yes

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title = "CHARACTERIZATION OF A NEW LOW MANGANESE, NIOBIUM MICROALLOYED STEEL FOR SOUR SERVICE",

abstract = "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",

author = "Ram{\'i}rez, \{Mario Gonz{\'a}lez\} and Falleiros, \{Neusa Alonso\} and H{\'e}lio Goldenstein and Frank Barbaro",

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doi = "10.5151/1516-392x-24781",

language = "English",

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T1 - CHARACTERIZATION OF A NEW LOW MANGANESE, NIOBIUM MICROALLOYED STEEL FOR SOUR SERVICE

AU - Ramírez, Mario González

AU - Falleiros, Neusa Alonso

AU - Goldenstein, Hélio

AU - Barbaro, Frank

PY - 2014/7

Y1 - 2014/7

N2 - 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

AB - 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

UR - http://dx.doi.org/10.5151/1516-392x-24781

U2 - 10.5151/1516-392x-24781

DO - 10.5151/1516-392x-24781

M3 - Paper

ER -

CHARACTERIZATION OF A NEW LOW MANGANESE, NIOBIUM MICROALLOYED STEEL FOR SOUR SERVICE

Abstract

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