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.

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.

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.

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.

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.

scholarly journals Tailoring Heterogeneous Microstructure in a High-Strength Low-Alloy Steel for Enhanced Strength-Toughness Balance

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1983
Author(s):  
Yishuang Yu ◽  
Minliang Gao ◽  
Bin Hu ◽  
Chang Tian ◽  
Xuequan Rong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Hsla Steel ◽  
High Strength ◽  
Back Stress ◽  
Heterogeneous Microstructure ◽  
Hsla Steels ◽  
Two Factors ◽  
Strength And Toughness

The attainment of both strength and toughness is of vital importance to most structural materials, although unfortunately they are generally mutually exclusive. Here, we report that simultaneous increases in strength and toughness in a high-strength low-alloy (HSLA) steel were achieved by tailoring the heterogeneous microstructure consisting of soft intercritical ferrite and hard martensite via intercritical heat treatment. The heterogeneous microstructure features were studied from the perspective of morphology and crystallography to uncover the effect on mechanical properties. Specifically, the volume fraction of martensite increased with increasing annealing temperature, which resulted in increased back stress and effective stress, and thereby an improved strength-ductility combination. The enrichment of carbon and alloying elements in the martensite was lowered with the increase in annealing temperature. As a result, the hardness difference between the intercritical ferrite and martensite was reduced. In addition, the globular reversed austenite preferentially grew into the adjacent austenite grain that held no Kurdjumov-Sachs (K-S) orientation relationship with it, which effectively refined the coarse prior austenite grains and increased the density of high angle grain boundaries. The synergy of these two factors contributed to the improved low-temperature toughness. This work demonstrates a strategy for designing heterostructured HSLA steels with superior mechanical properties.

Quantification of Vanadium Precipitates after Reheating Slab Steel by Synchrotron X-Ray Absorption Spectroscopy (XAS)

2017 ◽  
Vol 728 ◽  
pp. 20-25
Author(s):  
Audtaporn Worabut ◽  
Nirawat Thammajak ◽  
Hans Henning Dickert ◽  
Piyada Suwanpinij
Keyword(s):  
Hsla Steel ◽  
Dissolution Kinetics ◽  
High Strength ◽  
Rolling Process ◽  
Solubility Limit ◽  
Carbon Steels ◽  
Microalloyed Steels ◽  
Hsla Steels ◽  
Microalloying Elements ◽  
X Ray Absorption

High Strength Low Alloy (HSLA) steels or microalloyed steels are developed in order toimprove the strength and toughness compared with conventional carbon steels. During the reheatingprocess at 1250-1300 °C for a few hours, the furnace consumes large amount of energy, and the slabsuffers from thick oxide scale. This results in significant mass loss. The long reheating time ensuresmaximum dissolution of the microalloying elements, which must be kept to precipitate duringcooling at the end of the hot rolling process. To minimise the reheating time and save the energyconsumption, this research studied the dissolution kinetics of vanadium in HSLA steel. Vanadium isa main microalloying element added to provide higher strength mainly by precipitation hardening. Itis supposed to be dissolved readily according to the solubility limit. The samples were reheated to1200 °C and 1250 °C for 0, 10, 30, and 60 s. After that the fraction of vanadium dissolved in the solidsolution and the remaining undissolved phases of VC, CN, and V(C,N) were measured bysynchrotron XAS. As soon as the sample reaches as low temperature as 1200 °C, a large atomicfraction of 0.878 of vanadium can be dissolved in the solid solution.

Corrosion Resistant Performance of TMCP HSLA Steel for Oil Ship

2012 ◽  
Vol 190-191 ◽  
pp. 435-439
Author(s):  
Yan Tang Chen ◽  
Kai Guang Zhang
Keyword(s):  
Corrosion Resistance ◽  
Hsla Steel ◽  
High Strength ◽  
Corrosion Resistant ◽  
Ship Construction ◽  
Hsla Steels ◽  
Mo Content

Thermal-mechanical controlled process (TMCP) has been used to develop new high strength low alloy (HSLA) steels with excellent corrosion resistant property for oil ship construction. Experiment results shown that the microstructure of the steel, which consisted of only ferrite including bainite ferrite, exhibited expected corrosion resistant performance. Higher Mo content led to better corrosion resistance.

DOMEX 550MC

Alloy Digest ◽  
2009 ◽  
Vol 58 (3) ◽  
Keyword(s):  
Physical Properties ◽  
Hsla Steel ◽  
Steel Structures ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Cold Forming ◽  
Wide Range ◽  
Hot Rolled ◽  
Earthmoving Machines

Abstract Domex 550MC is a hot-rolled, high-strength low-alloy (HSLA) steel for cold forming operations. It is available in thicknesses of 2.00-12.80 mm. The alloy meets or exceeds the requirements of S550MC in EN 10149-2. Applications include a wide range of fabricated components and steel structures, including truck chassis, crane booms, and earthmoving machines. This datasheet provides information on composition, physical properties, tensile properties, and bend strength as well as fatigue. It also includes information on forming, heat treating, and joining. Filing Code: SA-594. Producer or source: SSAB Swedish Steel Inc.

Development of NbTiB Microalloyed HSLA Steels for High-Strength Heavy Plate

2005 ◽  
Vol 500-501 ◽  
pp. 565-572 ◽  
Author(s):  
H. Meuser ◽  
F. Grimpe ◽  
S. Meimeth ◽  
C.J. Heckmann ◽  
C. Träger
Keyword(s):  
High Strength ◽  
Optimum Process ◽  
Low Carbon ◽  
Low Alloy Steel ◽  
Alloying Element ◽  
Heavy Plate ◽  
Hsla Steels ◽  
Bainitic Microstructure ◽  
Bainitic Structure ◽  
Low Temperature Toughness

This paper deals with the development of low carbon NbTiB micro-alloyed high strength low alloy steel for heavy plates with high wall thickness. In the production of heavy plate it is remarkably difficult to achieve a combination of high strength and good low-temperature toughness. Bainitic microstructures have shown the capability to attain such requirements. To achieve a bainitic microstructure even for heavy wall products the formation of bainite can be promoted and supported by the use of small amounts of boron as a micro-alloying element. This industrial research project is based on the addition of small amounts of boron to promote the desired bainitic structure. Mill rolling trials were carried out to determine the optimum process parameters. The results of experimental mill rolling trials on 35 mm plates will be presented in this paper.

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