scholarly journals Effects of the Primary NbC Elimination on the SSCC Resistance of a HSLA Steel for Oil Country Tubular Goods

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5301
Author(s):  
Tianyi Zeng ◽  
Shuzhan Zhang ◽  
Xianbo Shi ◽  
Wei Wang ◽  
Wei Yan ◽  
...  
Keyword(s):  
Hsla Steel ◽  
High Strength ◽  
Oil Industry ◽  
High Angle ◽  
Hsla Steels ◽  
Metallic Inclusions ◽  
Sulfide Stress ◽  
The One ◽  
Sulfide Stress Corrosion Cracking ◽  
Grade Steel

Sulfide stress corrosion cracking (SSCC) has been of particular concern in high strength low alloyed (HSLA) steels used in the oil industry, and the non-metallic inclusions are usually considered as a detrimental factor to the SSCC resistance. In the present work, continuous casting (CC) and electroslag remelting (ESR) were adopted to fabricate a 125 ksi grade steel in order to evaluate the effect of microstructure with and without primary NbC carbides (inclusions) on the SSCC resistance in the steel. It was found that ESR could remove the primary NbC carbides, and hence, slightly increase the strength without deteriorating the SSCC resistance. The elimination of primary NbC carbides caused two opposite effects on the SSCC resistance in the studied steel. On the one hand, the elimination of primary NbC carbides increased the dislocation density and the proportion of high angle boundaries (HABs), which was not good to the SSCC resistance. On the other hand, the elimination of primary NbC carbides also induced more uniform nanosized secondary NbC carbides formed during tempering, providing many irreversible hydrogen traps. These two opposite effects on SSCC resistance due to the elimination of primary NbC carbides were assumed to be offset, and thus, the SSCC resistance was not greatly improved using ESR.

scholarly journals Electrochemical Determination of Hydrogen Entry to HSLA Steel during Pickling

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Jari Aromaa ◽  
Antero Pehkonen ◽  
Sönke Schmachtel ◽  
Istvan Galfi ◽  
Olof Forsén
Keyword(s):  
Hydrochloric Acid ◽  
Hsla Steel ◽  
Harmful Effect ◽  
High Strength ◽  
Steel Sample ◽  
Electrochemical Determination ◽  
Hsla Steels ◽  
Anodic Side ◽  
A Cell ◽  
The One

Pickling with hydrochloric acid is a standard method to clean steel surfaces before hot-dip galvanizing. When normal low strength steels are pickled, hydrogen formed in pickling reactions does not have any significant harmful effect on the mechanical properties of steel. However, in pickling of steels with higher strength, the penetration of hydrogen into the steel may cause severe damages. The effect of pickling of high-strength low-alloy (HSLA) steels was investigated using a cell construction based on the Devanathan-Stachurski method with modified anodic surface treatment and hydrogen production using acid. The penetration and the permeability of hydrogen were measured using an electrochemical cell with hydrochloric acid on the one side of the steel sample and a solution of NaOH on the other side. No protective coating, for example, palladium on the anodic side of the sample, is needed. The penetration rate of hydrogen into the steel and exit rate from the steel were lower for higher strength steel.

Microstructure Evolution of a HSLA Offshore Steel with Cooling Rates

2012 ◽  
Vol 583 ◽  
pp. 306-309
Author(s):  
Yan Tang Chen ◽  
Kai Guang Zhang ◽  
Ji Hao Cheng
Keyword(s):  
Cooling Rate ◽  
Steel Plate ◽  
Hsla Steel ◽  
High Strength ◽  
Structural Steels ◽  
Steel Making ◽  
Offshore Engineering ◽  
Hsla Steels ◽  
Rolling Experiment ◽  
Final Rolling

The high strength low alloy (HSLA) steels have been extensively used in offshore engineering. The appropriate microstructure of the HSLA structural steels was designedly controlled in steel making for offshore construction. The different microstructures of the steel were formed when shifted the cooling rate after final rolling. Experiment results shown that ferrite and pearlite were observed in the HSLA steel with a cooling rate less than 0.2°C/s. Bainite was formed when the cooling rate ranged from 1.0°C/s to 5.0°C/s and martensite was seen in the steel plate with a cooling rate more than 30°C/s. Generally the martensite is a prohibited product in the offshore structural steels.

scholarly journals Causes of Structural Heterogeneity in High-Strength OCTG Tubes and Minimizing Their Impact on Sulfide Stress Corrosion Cracking Resistance

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1843
Author(s):  
Artem Davydov ◽  
Andrey Zhitenev ◽  
Alexey Alhimenko ◽  
Natalya Devyaterikova ◽  
Konstantin Laev
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Structural Heterogeneity ◽  
Corrosion Cracking ◽  
Corrosion Properties ◽  
Sulfide Stress ◽  
Mechanical And Corrosion Properties ◽  
Quenching And Tempering ◽  
Sulfide Stress Corrosion Cracking

High-strength oil country tubular goods (OCTG) like C110, according to standard API 5CT (yield strength at least 758 MPa), are subject to requirements in terms of mechanical and corrosion properties. In this work, we studied the microstructure of seamless casing tubes made of class C110 high-strength steel with a 194.5 mm diameter and 19.7 mm wall thickness, and its influence on sulfide stress corrosion cracking (SSC). Casing tubes were obtained from continuous billets by screw piercing with preliminary quenching and tempering. It was shown that cracking during the tests always begins from the inner surface of the tube. Rough segregation bands were found on the inner tube surface, which occupies about a third of the thickness of the wall. To increase the resistance of 0.3C-Cr-Mn-Mo + 0.15(V + Nb + Ti) steel to SSC, primary recommendations for adjusting the chemical composition, production technology and heat treatment were developed.

Dual Ferrite-Martensite Treatments of an ASTM A588 HSLA Steel

1981 ◽  
Vol 39 ◽  
pp. 318-319
Author(s):  
L.J. Chen ◽  
J.R. Yang
Keyword(s):  
Yield Strength ◽  
Hsla Steel ◽  
Charpy Impact ◽  
High Strength ◽  
High Yield ◽  
The Past ◽  
Hsla Steels ◽  
Corrosion Resistance Property ◽  
Different Temperatures ◽  
Subsequent Quenching

During the past several years duplex ferrite-martensite (DFM) steels have received increasing attention for improved strength and weight applications, since they contain characteristic microstructural features that combine high strength with good formability. ASTM A588 is one of the most widely used classes of high strength low alloy (HSLA) steels. It possesses the atmospheric corrosion resistance property as well as relatively high yield strength (∼35 kg/mm2) in the normalized condition. DFM treatments has been applied to the A588 steel.The treatments consisted of initial austenitization and quenching to form 100% martensite, followed by annealing in the (α+γ) region at different temperatures and subsequent quenching. The DFM structure samples were also tempered at 200°-600°C for one hour. Phase diagram of a model steel and the schematic of treatments are shown in Figs. 1(a) and 1(b), respectively. Hardness, ultimate tensile strength, yield strength, elongation and Charpy impact values were measured for thermally treated samples.

scholarly journals Influence of Structural Heterogeneity of High-Strength OCTG Tubes on Sulfide Corrosion Cracking Resistance

2021 ◽  
Vol 3 (1) ◽  
pp. 5
Author(s):  
Artem Davydov ◽  
Andrey Zhitenev ◽  
Natalya Devyaterikova ◽  
Konstantin Laev
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Threshold Value ◽  
Structural Heterogeneity ◽  
Corrosion Cracking ◽  
Corrosion Properties ◽  
Sulfide Corrosion ◽  
Sulfide Stress ◽  
Sulfide Stress Corrosion Cracking

High-strength oil country tubular goods (OCTG) like C110, according to standard API 5CT (yield strength at least 758 MPa), are subject to requirements in terms of mechanical and corrosion properties. In this work, we studied the influence of seamless tubes microstructure with a 177.8 mm diameter and 10.36 mm wall thickness of class С110 high-strength steel to sulfide stress corrosion cracking (SSC) and sulfide stress corrosion cracking with low strain rates (SSRT). Tubes were obtained from continuous billets by screw piercing with preliminary quenching and tempering. It was established that cracking during the tests always begins from the inner surface of the tube. Rough segregation bands were found on the inner tube surface, which occupies about a third of the thickness. It is shown that the SSRT assessment technique allows to estimate the threshold value of the resistance.

Effect of Alloying Elements on Mechanical Properties of High-Strength Low-Alloy Steel

2020 ◽  
Vol 1007 ◽  
pp. 41-46
Author(s):  
Ning Li ◽  
Wilasinee Kingkam ◽  
Zi Ming Bao ◽  
Ren Heng Han ◽  
Yao Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hsla Steel ◽  
High Strength ◽  
Ultimate Tensile Stress ◽  
Vacuum Induction Furnace ◽  
Low Alloy Steels ◽  
Hsla Steels ◽  
Different Types ◽  
Calculation Results ◽  
Alloy Steels

In this study, the two types of high-strength low-alloy steels were melted and cast in a vacuum induction furnace. Phase transition temperature of HSLA steel was calculated by JMatPro software. The calculation results show that the two different types of HSLA steels which have equal phase proportions of ferrite and austenite at a temperature of approximately 820 and 800 °C in HSLA-I and HSLA-II, respectively. In addition, the effect of chemical composition on the microstructure and mechanical properties of steels were studied. The results indicate that the ultimate tensile stress value of HSLA-II samples was greater than the HSLA-I samples by about 35%, and the yield stress and breaking strength value of HSLA-II were higher than HSLA-I as well.

Influence of Grain Size on Corrosion Resistance of a HSLA Steel

2012 ◽  
Vol 557-559 ◽  
pp. 143-146 ◽  
Author(s):  
Yan Tang Chen ◽  
Kai Guang Zhang
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Corrosion Resistance ◽  
Mechanical Performance ◽  
Hsla Steel ◽  
High Strength ◽  
Corrosion Resistant ◽  
Hsla Steels ◽  
Mechanical Properties And Corrosion ◽  
Mn Steel

The mechanical performance, workability, weldability and corrosion resistance of structural high strength low alloy (HSLA) steels used in offshore engineering have been generally required. The effect of grain size on the corrosion resistant performance of a C-Mn structural steel has been investigated with stress on hunting a appropriate grain size to balance mechanical properties and corrosion resistant performance. The results showed that the C-Mn steel with grain size in 10～25μm scope provided expected mechanical properties and corrosion resistance.

Fracture Toughness Assessment of the Susceptibility for Sulfide Stress Corrosion Cracking in High Strength Carbon Steels: A review

CORROSION ◽  
10.5006/3610 ◽  
2020 ◽  
Author(s):  
Raymundo Case ◽  
Bostjan Bezensek
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Propagation ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength ◽  
Carbon Steels ◽  
Sulfide Stress ◽  
Sulfide Stress Corrosion Cracking

High strength carbon steels typically used as oil country tubular goods can be susceptible to sulfide stress corrosion cracking (SSC) when in service in environments that contain H2S. In the last 25 years, linear-elastic fracture mechanics has been used to understand both the mechanistic aspects of this form of cracking and to quantify the susceptibility to SSC of different OCTG steel grades. This paper presents a review on the evolution of the Double Cantilever Method (DCB) as a standard practice to assess the threshold stress intensity factor KISSC. The paper evaluates the capabilities and limitations of this testing method to describe the conditions associated with crack propagation. The review study indicates that new fracture parameters based on the energy required for crack propagation such as J-integral JIc might be required to overcome the limitations of the static conditions implied in the stress intensity factor KIc evaluation approach

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