Peculiarities of Structure and Physical-Mechanical Properties of High-Strength Cr-Mo Pipe Steel Applicative Mainly in a Sour Environment

2021 ◽  
Vol 902 ◽  
pp. 29-34
Author(s):  
Evgeniia A. Putilova ◽  
Kristina D. Kryucheva ◽  
Sergey M. Zadvorkin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Dislocation Density ◽  
Pipe Steel ◽  
High Strength ◽  
Stress Cracking ◽  
Main Requirement ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking ◽  
Increased Strength

This paper demonstrates the results of the study of microstructure and physical-mechanical properties of the high-strength economically alloyed Fe-Cr-Mo steel, developed by RosNITI JSC for the production of the oil country tubular goods (OCTG) (casing and tubing). The main requirement for this steel is to provide simultaneous increased strength and resistance to sulfide stress cracking (SSC). It was shown that this problem could be solved by special heat treatment. As a result, the structure of this steel consists of a secondary sorbite with a lower dislocation density. Hardening is provided by dispersion-strengthened V, Nb carbides.

Fit For Service Qualification for Sour Service High Strength Production Casing For High Temperature

2021 ◽  
Author(s):  
Luciana I. L Lima ◽  
Christelle Gomes ◽  
Carine Landier ◽  
Marilia Lima ◽  
Kevin Schleiss ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Yield Strength ◽  
High Strength ◽  
Materials Selection ◽  
Well Production ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking ◽  
Sour Service ◽  
Minimum Yield

Abstract In recent years the application of high strength carbon steel with 125ksi specified minimum yield strength as a production casing in deepwater and high-pressure reservoirs has increased. Sulfide stress cracking (SSC) can develop when high strength carbon steel is exposed to a sour environment. The H2S partial pressure in these sour reservoirs is above the 0.03 bar limit for this material at room temperature. Materials SSC performance evaluation requires an accurate simulation of field conditions in the laboratory. To evaluate the production casing SSC behavior, some fit for service (FFS) tests were carried out considering the well geothermic temperature profile for the materials selection. This paper presents a fit for service qualification carried out on Casing 125 ksi SMYS (Specified Minimum Yield Strength) materials. Two products with 125ksi SMYS were considered: one that has existed for several years and one developed more recently with a better SSC resistance – above the pH2S limit considered for the standard 125ksi SMYS material. The results obtained in this test program allowed casing 125 ksi SMYS materials selection for temperature above 65°C and environment more severe in terms of pH2S than the domain previously established for this grade. This allowed a new well production design, which saves one casing phase and avoids the necessity to use intermediate liners to prevent collapse.

Improvement of Low-Alloy Pipe Steel Sulfide Stress Cracking Resistance

Metallurgist ◽  
2019 ◽  
Vol 63 (3-4) ◽  
pp. 376-387
Author(s):  
A. A. Kholodnyi ◽  
Ya. S. Kuznechenko ◽  
Yu. I. Matrosov ◽  
M. V. Il’ichev ◽  
D. I. Yusupov
Keyword(s):  
Pipe Steel ◽  
Cracking Resistance ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking

High-Strength Steels with Improved Sulfide Stress Cracking Resistance

CORROSION ◽  
1986 ◽  
Vol 42 (1) ◽  
pp. 54-61 ◽  
Author(s):  
A. Chavane ◽  
M. Habashi ◽  
G. M. Pressouyre ◽  
J. Galland
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Cracking Resistance ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking

Effect of Line Pipe Steel Microstructure on Susceptibility to Sulfide Stress Cracking

CORROSION ◽  
2004 ◽  
Vol 60 (3) ◽  
pp. 244-253 ◽  
Author(s):  
S. U. Koh ◽  
J. S. Kim ◽  
B. Y. Yang ◽  
K. Y. Kim
Keyword(s):  
Grain Boundary ◽  
Hydrogen Diffusion ◽  
Pipe Steel ◽  
Crack Nucleation ◽  
Corrosion Properties ◽  
Line Pipe ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Line Pipe Steel ◽  
Sulfide Stress Cracking

Abstract The purpose of this experiment was to evaluate the effect of microstructure on sulfide stress cracking (SSC) properties of line pipe steel. Different kinds of microstructures, with chemical compositions identical to one steel heat, were produced by various thermomechanically controlled processes (TMCP). Coarse ferrite-pearlite, fine ferrite-pearlite, ferrite-acicular ferrite, and ferrite-bainite microstructures were investigated with respect to corrosion properties, hydrogen diffusion, and SSC behavior. SSC was evaluated using a constant elongation rate test (CERT) in a NACE TM0177 solution (5% sodium chloride [NaCl] + 0.5% acetic acid [CH3COOH], saturated with hydrogen sulfide [H2S]). The corrosion properties of steels were evaluated by potentiodynamic and linear polarization methods. Hydrogen diffusion through steel matrix was measured by an electrochemical method using a Devanathan-Stachurski cell. The effect of microstructure on cracking behavior also was investigated with respect to crack nucleation and propagation processes. Test results showed that ferrite-acicular ferrite microstructure had the highest resistance to SSC, whereas ferrite-bainitic and coarse ferritie-pearlitic microstructures had the lowest resistance. The high susceptibility to SSC inferritie-bainitic and coarse ferritic-pearlitic microstructures resulted from crack nucleation on hard phases such as grain boundary cementite in coarse ferritie-pearlitic microstructures and martensite/retained austenite (M/A) island in bainitic phases. Hard phase cementite at grain boundaries or M/A constituent in bainitic phases acted as crack nucleation sites and could be cracked easily under external stress; consequently, the susceptibility of steel to SSC increased. Metallurgical parameters including matrix structure and defects such as grain boundary carbides and inter-lath M/A constituents were more critical parameters for controlling SSC than the hydrogen diffusion rate.

Effect of Postweld Heat Treatment on the Sulfide Stress Cracking of Dissimilar Welds of Nickel-Based Alloy 625 on Steels

CORROSION ◽  
10.5006/3081 ◽  
2019 ◽  
Vol 75 (6) ◽  
pp. 641-656
Author(s):  
Tao Dai ◽  
Ramgopal Thodla ◽  
William Kovacs III ◽  
Kavitha Tummala ◽  
John Lippold
Keyword(s):  
Heat Treatment ◽  
Postweld Heat Treatment ◽  
Alloy 625 ◽  
Stress Cracking ◽  
Dissimilar Welds ◽  
Sulfide Stress ◽  
Nickel Based Alloy ◽  
Sulfide Stress Cracking ◽  
Postweld Heat

Effects of chromium and tungsten on sulfide stress cracking in high strength low alloy 125 ksi grade casing steel

2019 ◽  
Vol 160 ◽  
pp. 108163 ◽  
Author(s):  
X.T. Wang ◽  
M. Liu ◽  
G.Y. Zhou ◽  
H. Jiang ◽  
X. Li ◽  
...  
Keyword(s):  
High Strength ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking ◽  
And Tungsten
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