Metallographic study of hydrogen-induced cracking in line pipe steels

JOM ◽  
1976 ◽  
Vol 28 (5) ◽  
pp. 1-10
Author(s):  
A. P. Coldren ◽  
G. Tither
Keyword(s):  
Pipe Steels ◽  
Line Pipe ◽  
Metallographic Study ◽  
Hydrogen Induced Cracking

ULTRASONIC EVALUATION OF RESISTANCE TO HYDROGEN-INDUCED CRACKING OF LINE PIPE STEELS

1987 ◽  
pp. 359-365
Author(s):  
J.C. ALBERT ◽  
O. CASSIER ◽  
H. MARGOT-MARETTE ◽  
G. BARDOU ◽  
P. VIRLOUVET
Keyword(s):  
Pipe Steels ◽  
Line Pipe ◽  
Ultrasonic Evaluation ◽  
Hydrogen Induced Cracking

Hydrogen Induced Cracking Susceptibility of High-Strength Line Pipe Steels

CORROSION ◽  
1986 ◽  
Vol 42 (6) ◽  
pp. 337-345 ◽  
Author(s):  
K. Matsumoto ◽  
Y. Kobayashi ◽  
K. Ume ◽  
K. Murakami ◽  
K. Taira ◽  
...  
Keyword(s):  
High Strength ◽  
Pipe Steels ◽  
Line Pipe ◽  
Hydrogen Induced Cracking

Hydrogen-Induced Cracking of Line Pipe Steels Used in Sour Service

CORROSION ◽  
1993 ◽  
Vol 49 (7) ◽  
pp. 531-535 ◽  
Author(s):  
R. W. Revie ◽  
V. S. Sastri ◽  
M. Elboujdaini ◽  
R. R. Ramsingh ◽  
Y. Lafrenière
Keyword(s):  
Pipe Steels ◽  
Line Pipe ◽  
Hydrogen Induced Cracking ◽  
Sour Service

Effects of Microstructural Inhomogeneity on HIC Susceptibility and HIC Evaluation Methods for Linepipe Steels for Sour Service

2014 ◽  
Author(s):  
Kyu Tae Kim ◽  
Sang Gi Ko ◽  
Jong Man Han
Keyword(s):  
Deep Sea ◽  
Acicular Ferrite ◽  
Evaluation Methods ◽  
Polygonal Ferrite ◽  
Internal Quality ◽  
Pipe Steels ◽  
Line Pipe ◽  
Microstructural Inhomogeneity ◽  
Hydrogen Induced Cracking ◽  
Sour Service

It has been well documented that slab internal quality is one of the key factors for reduced susceptibility of hydrogen induced cracking (HIC) in line pipe steels designed for sour gas service. In addition, the creation of a homogeneous microstructure which is heavily influenced by the slab internal quality is also a critical key parameter to reduce the HIC susceptibility in higher strength line pipe steel grade X60 and above. For the application of deep sea linepipe exposed to higher external pressure environments, heavy gauge in combination with higher strength steel is essential. Homogeneity of the steel microstructure is a key to success for thicker plates used in sour service HIC applications in combination with a deep sea environment. In this paper, various microstructures were compared along with an evaluation of the effects of the various microstructures on HIC susceptibility in grades X52, X65 and X70 designed for sour service. The various microstructures compared consisted of polygonal ferrite and pearlite in the X52 and polygonal ferrite, pearlite, acicular ferrite and bainite in the X65 and X70. The effect of microstructural inhomogeneity on HIC susceptibility was comparatively lower for the X52 than that of the X65 and X70. The microstructure of grade X65 and X70 were different due to the different conditions of rolling and cooling that were applied. Grades X65/X70 had a microstructure of polygonal ferrite/pearlite with bainite islands that resulted in a high crack length ratio (CLR) value caused by different hardness regions across the microstructural matrix. A homogeneous fine acicular ferrite microstructure produced by optimizing temperature control during rolling and cooling showed no hydrogen induced cracking. In addition, this alloy/process/microstructure design resulted in improved toughness results in low temperature drop weight tear test (DWTT). This paper will describe the successful production results of plate and pipe for high strength heavier gauge line pipe steels with highly homogeneous microstructures designed for sour service by controlling chemical design and process conditions in rolling and cooling. In addition, HIC evaluation methods utilizing both a traditional NACE TM0284 method versus that of a Scan-UT method were conducted and compared. A proposal to make the NACE TM0284 testing method more reliable by using Scan-UT method will be presented.

Niobium Microalloyed Line Pipe Steels: Technological Overview

2013 ◽  
Author(s):  
J. M. Gray ◽  
S. V. Subramanian
Keyword(s):  
Process Integration ◽  
Target Strength ◽  
Accelerated Cooling ◽  
Pipe Steels ◽  
Line Pipe ◽  
Steel Technology ◽  
Quantitative Understanding ◽  
Line Pipe Steel ◽  
Low Levels ◽  
Evolution Of Microstructure

A quantitative understanding of hierarchical evolution of microstructure is essential in order to design the base chemistry and optimize rolling schedules to obtain the morphological microstructure coupled with high density and dispersion of crystallographic high angle boundaries to achieve the target strength and fracture properties in higher grade line pipe steels, microalloyed with niobium. Product-process integration has been the key concept underlying the development of niobium microalloyed line pipe steel technology over the years. The development of HTP technology based on 0.1 wt % Nb and low interstitial was predicated by advances in process metallurgy to control interstitial elements to low levels (C <0.03wt% and N< 0.003wt%), sulfur to ultra-low levels (S<20ppm), as well as in product metallurgy based on advances in basic science aspects of thermo-mechanical rolling and phase transformation of pancaked austenite under accelerated cooling conditions, and toughness properties of heat affected zones in welding of niobium microalloyed line pipes. A historical perspective/technological overview of evolution of HTP for line pipe applications is the focus of this paper in order to highlight the key metallurgical concepts underlying Nb microalloying technology which have paved the way for successful development of higher grade line pipe steels over the years.

Improved Specifications Needed for Line Pipe Steels

1963 ◽  
Vol 15 (04) ◽  
pp. 370-374
Author(s):  
J.W. Squire
Keyword(s):  
Pipe Steels ◽  
Line Pipe

Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

2016 ◽  
Vol 662 ◽  
pp. 481-491 ◽  
Author(s):  
Nazmul Huda ◽  
Abdelbaset R.H. Midawi ◽  
James Gianetto ◽  
Robert Lazor ◽  
Adrian P. Gerlich
Keyword(s):  
Impact Toughness ◽  
Pipe Steels ◽  
Line Pipe
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