High Nitrogen Alloyed Steels for Nonmagnetic Drill Collars. Standard Steel Grades and Latest Developments

Saller, G.; Aigner, H.

doi:10.1081/amp-120027497

Cited by 15 publications

(7 citation statements)

References 2 publications

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“…The approach of Satir-Kolorz et al [12] enables the prediction of the nitrogen solubility at 1600°C according to equations (2) and (3). The considered interaction parameters are given in…”

Section: Nomenclaturementioning

confidence: 99%

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On Restricting Aspects in the Production of Nonmagnetic Cr‐Mn‐N‐alloyed Steels

Saller

Bernauer

Leitner

et al. 2005

steel research international

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Cr-Mn steel grades with high nitrogen contents are becoming increasingly important in the field of austenitic stainless steels. Industrial production facilities allow to use two different strategies to reach a high nitrogen content. The first involves taking advantage of the pressurisedelectroslag remelting process, which is operated at elevated nitrogen partial pressure; the second consists of adding elements which increase the nitrogen solubility of the melt so that high nitrogen contents can be achieved at atmospheric pressure. This paper focuses on nitrogen solubility and austenite stability. These have been observed as important and in some cases restricting for the successful implementation and production of high alloyed Cr-Mn austenitic steels. The precondition for a stable austenitic microstructure can be predicted with the help of equations using chromium and nickel equivalents. Different formulae were tested and their results compared to the microstructure of the alloys. The nitrogen solubility in the melt is particularly important for the steel grades cast under atmospheric conditions. It has been found feasible to produce steel grades up to 0.9 mass percent nitrogen at atmospheric pressure on an industrial scale. Several theoretical approaches for calculating the nitrogen solubility in the melt were tested for atmospheric conditions and compared to the chemical analyses of conventionally cast Cr-Mn steel grades.Keywords: Cr-Mn-N austenitic stainless steels, high nitrogen steels, Bohler P558. Bohler P560. nitrogen solubility, austenite stability steel research int. 76 (2005) No. 11

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“…The approach of Satir-Kolorz et al [12] enables the prediction of the nitrogen solubility at 1600°C according to equations (2) and (3). The considered interaction parameters are given in…”

Section: Nomenclaturementioning

confidence: 99%

“…These properties make them very suitable for high-strength applications when there is an additional demand on corrosion properties. The applications are wide, from drill collars for the oilfield industry and ending at medical implants [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

On Restricting Aspects in the Production of Nonmagnetic Cr‐Mn‐N‐alloyed Steels

Saller

Bernauer

Leitner

et al. 2005

steel research international

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“…The Cr-Mn(-Ni)-N series high nitrogen austenitic stainless steels are extensively used as equipment materials for retaining ring for thermal power generator, geological exploration and oil and gas development [1,2]. With the depletion of near surface oil resources, deep and ultra deep layers will be the main positions for major oil and gas discovery in the future.…”

Section: Introductionmentioning

confidence: 99%

“…The typical production process of high nitrogen stainless steel forgings is: electric arc furnace steelmakingmultistage refining-(electroslag remelting) -open forging (fast forging machine) -rough forging (diameter forging machine) -precision forging (diameter forging machine) [1,[3][4][5]. The matching and control of key alloy elements such as C, N, Mn, Cr, Mo, especially the control of the lower limit of N element [6] is the key to obtain excellent strength, toughness, high corrosion resistance and ultra-low magnetic permeability of high nitrogen austenitic stainless steel [7,8].…”

Section: Introductionmentioning

confidence: 99%

Study on thermal deformation behavior and microstructure evolution of P550 high nitrogen austenitic stainless steel

Guo

2023

Mater. Res. Express

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The high nitrogen austenitic stainless steel is widely used as power generation and geological exploration equipment materials because of its excellent strength, corrosion resistance and non-magnetic. In this paper, the mechanical behavior and microstructure evolution of P550 steel in the range of 900-1200 ℃ and 0.001-10 s-1 deformation conditions were studied by physical and heat treatment simulations, metallographic observations and thermal processing maps. The results showed that the flow curves quickly reach the peak and then soften to a steady state, which indicates dynamic recrystallization (DRX) behavior. DRX is easy to occur when the deformation temperature is above 1080 ℃. The activation energy of the forged P550 stainless steel was calculated as 519 kJ/mol. There is a positive correlation between the peak stress, DRX critical stress, strain and Z value of the tested steel. The instability of the tested steel is easy to produce in the high strain rate region and low temperature region during hot working. Crack germinates and expands preferentially at the "necklace structure" of inadequate dynamic recrystallization. Under the deformation state of 0.001 s-1, coarse crystals and mixed crystals are easily emerged during subsequent heat treatment. Combining the hot working map, the maximum deformation resistance and the grain evolution behavior during hot working and heat treatment, the suggested working window is T=1020-1200 ℃ and έ=0.01-1 s-1.

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“…The content of elements in the equation is expressed in wt. %, and k is the coefficient before nitrogen, which varies in the range from 13 to 30 [1,[5][6][7][8]. Modified equations for calculating PREN are presented in [1,9], taking into account the effect of tungsten and a decrease in the solubility of nitrogen when its content is higher than the equilibrium one.…”

Section: Introductionmentioning

confidence: 99%

Regularities of the Influence of Substitutional and Interstitial Alloying Elements on the Corrosion Properties of Austenitic Stainless Steels

Merkushkin

Berezovskaya

Serzhanin

2021

DDF

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Pitting corrosion studies were carried out on nitrogen containing austenitic stainless steels of different compositions and concentrations of alloying elements. As was shown there is a certain predicted influence of the concentration of each alloying elements as chromium, manganese, nickel, carbon and nitrogen on the pitting potential (Eb) of investigated steels with the nitrogen content less than 0.169 wt. %. However with an increase of the nitrogen content to a certain value (in our study up to 0.82 wt. %) the predicting of alloying elements influence on pitting potential of the steels requires a new approach. Based on the analysis of the experimental results and to take into account the influence of all alloying elements in steel on the pitting potential, a regression equation is proposed. In the presence of nitrogen, the positive role of carbon on the pitting resistance of stainless steel was shown, and the critical values of the total content (C + N) and the C / N ratio were determined, allowing prediction of the best composition of stainless steel.

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High Nitrogen Alloyed Steels for Nonmagnetic Drill Collars. Standard Steel Grades and Latest Developments

Cited by 15 publications

References 2 publications

On Restricting Aspects in the Production of Nonmagnetic Cr‐Mn‐N‐alloyed Steels

On Restricting Aspects in the Production of Nonmagnetic Cr‐Mn‐N‐alloyed Steels

Study on thermal deformation behavior and microstructure evolution of P550 high nitrogen austenitic stainless steel

Regularities of the Influence of Substitutional and Interstitial Alloying Elements on the Corrosion Properties of Austenitic Stainless Steels

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