Effect of N, Mo, and Si on Local Corrosion Resistance of Unstabilized Cr–Ni and Cr–Mn–Ni Austenitic Steels

Pisarevskii, L. A.; Филиппов, Г. А.; Lipatov, A. A.

doi:10.1007/s11015-016-0372-x

Cited by 8 publications

(8 citation statements)

References 2 publications

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“…All nitrogen-doped chromium-nickel steels containing molybdenum do not collapse under prolonged stress tests. They are characterized by high resistance against pitting and crevice corrosion, which confirms the previously obtained data [8,21,22]. Areas of secondary activation absent on a polarization curve 3 steel 12Khl8N13AM3 (see Figure 1) are alloyed with nitrogen and molybdenum.…”

Section: Corrosion Behavior Of Cold-deformed Austenitic Steelssupporting

confidence: 89%

Local Corrosion of Austenitic Steels and Alloys

Alexandrovich¹,

Anatolievich²

2017

Austenitic Stainless Steels - New Aspects

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The principles of doping of austenitic unstabilized Cr-Ni and Cr-Mn-Ni steels resistant against pitting, slit, and intergranular corrosion (IGC) in weakly and strongly oxidative media are considered. The features of the effect of individual and joint doping with nitrogen, molybdenum, and silicon steels on their resistance to local corrosion have been studied. The ambiguous effect of joint doping with nitrogen and molybdenum of Cr-Mn-Ni steels on their resistance against pitting corrosion is revealed. It has been established that the presence of silicon, in addition to nitrogen and molybdenum, is a prerequisite for eliminating the propensity to the IGC after a long release of chromium-nickel steels. The introduction of silicon into Cr-Ni steel with 0.03% C, with a balanced content of Cr, N, Mo, and Si, equates it with a particularly low-carbon steel containing 0.003% C. Based on the above doping principles, a number of austenitic steels are designed for production equipment that is resistant to local corrosion in chloride-containing media and nitric acid.

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Section: Corrosion Behavior Of Cold-deformed Austenitic Steelssupporting

confidence: 89%

Local Corrosion of Austenitic Steels and Alloys

Alexandrovich¹,

Anatolievich²

2017

Austenitic Stainless Steels - New Aspects

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“…1; значения параметров 0 и Р (до испытаний на коррозию) найдены по методике [6]; величины скорости коррозии К в хлоридосодержащем растворе (ГОСТ 9.911289) привлечены из работы [7]. [3]) в коррозийную стойкость стали AISI 321 по сравнению с углеродом. Такое рассуждение для стали AISI 321 подтверждается экспериментальными зависимостями К от 0 и P (рис.…”

Section: экспериментальные исследования и их обсуждениеunclassified

“…Химический состав сталей определяет их питтингостойкость в хлоридосодержащих средах, при этом существен-ную роль играют азот, хром и молибден [2]. Легирование азотом или молибденом улучшает пассивирующую способность сталей, но их устойчивость к локальной коррозии остается недостаточной [3]. Азот повышает устойчивость к коррозии, подавляя дальнейшее растворение металла [4].…”

Section: Introductionunclassified

Магнитометрический Подход К Изучению Влияния Углерода И Азота На Коррозионную Стойкость Аустенитных Хромоникелевых Сталей

Снежной¹,

Snezhnoi²

2020

aktt

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Extensive investigations of the corrosion resistance of austenitic chromium-nickel steels (with stable and unstable austenite) do not reveal the full nature of the phenomena studied. By the magnetometric method, using the specific magnetic susceptibility c0 of austenite and low content Рd d-ferrite (0…0.5 %), the corrosion properties of steels were studied. These parameters are determined by the chemical composition of steel, heat treatment and deformation. The pitting corrosion rate correlates with these parameters. In the scientific literature, the results of studies of the corrosion resistance of metals with variation over a wide range of carbon and nitrogen contents are given. In this work, the influence of these elements in five swimming trunks of each steel grade AISI 304 and AISI 321 is investigated. In steels AISI 304 and AISI 321, with an increase in c0 and Рd (under the condition low content of d-ferrite), the pitting corrosion rate К decreases. The values of c0 and Рd from the total content Q (wt.%) of all alloying elements for each melt are determined. The dependences of the corrosion rate K on Q for each melt of AISI 304 and AISI 321 steels are obtained. Various forms of К(Q) dependency curves are caused by a lower content of nickel, silicon and a higher content of chromium, manganese, carbon, nitrogen in AISI 304 steel. Also in AISI 321 steel, titanium is present. The dependences of К, c0 and Рd on the content of carbon and nitrogen, in the presence of all other alloying elements, are determined. Various (presence of a maximum or minimum) parabolic dependencies of К, c0 and Рd on the carbon and nitrogen contents were revealed. For melts of steel AISI 304, of the effect carbon and nitrogen on corrosion resistance are the opposite of the sum of all other alloying elements. For melts of steel AISI 321, the carbon present makes a smaller contribution to corrosion resistance compared to nitrogen. For AISI 321 steel melts, an ambiguous character of the dependence of the pitting corrosion rate K on the total content Q of all other alloying elements was found. Two values of Q (a parabolic dependence of K(Q)) can correspond to one value of K. The critical points (the content of alloying elements), before and after which the parameters c0, Pd can increase or decrease, are determined. As a result, the paramagnetic state of austenite changes, which correlates with a change in the corrosion properties of steel.

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“…Therefore, alloy design strategies also focused on alloying of austenitic stainless steels by single or combined addition of nitrogen, molybdenum, and silicon. Based on such alloying principles, many austenitic stainless steels grades can be defined, dedicated to resisting local corrosion in chloride-containing media and nitric acid [15].…”

Section: About Austenitic Stainless Steelsmentioning

confidence: 99%