Seawater resistance of a second generation superaustenitic stainless steel

Wallén, B.; Alfonsson, E.

doi:10.1002/maco.19950460602

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Their extensive use is because of their superior corrosion resistance, enhanced mechanical property, formability, and weldability 4, 5 . However, the high Mo and Cr concentrates in S32654 steels may promote the segregation of the elements and formation of precipitated phases such as σ, χ, and Laves phase 3, 6–8 .…”

Section: Introductionmentioning

confidence: 99%

“…Super austenitic stainless steels S32654 are primarily used in applications where increased pitting and crevice corrosion resistances are required, such as marine and offshore applications, seawater handling systems, nuclear power plant condenser tubes, waste incineration systems, and chemical-processing equipment 1 – 3 . Their extensive use is because of their superior corrosion resistance, enhanced mechanical property, formability, and weldability 4 , 5 . However, the high Mo and Cr concentrates in S32654 steels may promote the segregation of the elements and formation of precipitated phases such as σ, χ, and Laves phase 3 , 6 – 8 .…”

Section: Introductionmentioning

confidence: 99%

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A combined experimental and first-principle study on the oxidation mechanism of super austenitic stainless steel S32654 at 900 °C

Dong

Zhang

et al. 2017

Sci Rep

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A combined experimental and first-principle study on the oxidation mechanism of super austenitic stainless steel S32654 at 900 °C for a short time period ( Super austenitic stainless steels S32654 are primarily used in applications where increased pitting and crevice corrosion resistances are required, such as marine and offshore applications, seawater handling systems, nuclear power plant condenser tubes, waste incineration systems, and chemical-processing equipment [1][2][3] . Their extensive use is because of their superior corrosion resistance, enhanced mechanical property, formability, and weldability 4, 5 . However, the high Mo and Cr concentrates in S32654 steels may promote the segregation of the elements and formation of precipitated phases such as σ, χ, and Laves phase 3, 6-8 . Recently, many reported investigations on S32654 mainly focused on the hot deformation behaviour, precipitation behaviour, and corrosion resistance [9][10][11] .In recent years, many studies have examined the high-temperature oxidation mechanism of the lower-Mo-content stainless steels [12][13][14][15][16] . Yun et al. 13 examined the effect of Mo on the oxidation resistance of Fe-22Cr-0.5Mn ferritic stainless steel at 800 °C and confirmed that the lower Mo addition (<4 wt.%) effectively enhanced the oxidation stability at the initial oxidation stage up to 300 h. Buscail et al. 14 demonstrated that Mo could restrain the outward diffusion of Fe and decrease the growth rate of the oxide layer, which enhanced the oxidation stability of the AISI 316 L stainless steel at 900 °C. Mo contents below 3 wt.% in the ferritic stainless steel could reduce the absorption of O 2 , prevent the outward diffusion of the metal cations and inward diffusion of anions, and enhance the oxidation resistance 16 . Furthermore, alloys with high Mo contents sustain the heavy oxidation at high temperatures because of the formation of volatile MoO 3 species [17][18][19][20] investigated the effect of Mo on the oxidation behaviour of AISI 304 and discovered that Mo could accelerate the oxidation rate because the evaporation of volatile MoO 3 damaged the Cr 2 O 3 layer. However, for high-Mo-content austenitic stainless steels such as S32654 steels, the effect of Mo on the high-temperature oxidation behaviour is inadequate. Therefore, the investigation on the high-temperature oxidation behaviour of S32654 steels is useful.Moreover, our previous work 21 mainly investigated the oxidation behaviour of S32654 steels at 900 °C, 1000 °C, and 1200 °C in air. At 900 °C, the samples exhibit excellent oxidation resistance because the MnMoO 4 layer and

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A combined experimental and first-principle study on the oxidation mechanism of super austenitic stainless steel S32654 at 900 °C

Dong

Zhang

et al. 2017

Sci Rep

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“…Nitrogen has proved particularly attractive its an alloying element in view of its strengthening [1, 2] and beneficial effect on localized corrosion resistance [3]. High temperature mechanical properties (strength, creep resistance) are also improved by addition of nitrogen [4].…”

Section: Introductionmentioning

confidence: 99%

Tensile properties and fatigue crack propagation of solution-annealed and aged superaustenitic stainless steel

Iino

Lim²

1998

Metals and Materials

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The effect of aging in air at 650"C for 100~1000 h on the tensile properties of superaustenitic stainless steel in the range RT-750~ and the fatigue crack growth behaviour at RT and 650~ was studied. Yield strength and ultimate tensile strength were almost the same between the as-received and the aged specimen. The fracture strain, however, decreased significantly from aging, and the fracture surface of the aged specimen at RT test was intergranular. The fatigue crack growth rate at RT is enhanced by aging at the high stress intensity factor range. This is due to the occurrence of an intergranular fracture in the aged specimen. At 650"C the fatigue crack growth behaviour of both the as-received and the aged specimen was almost same with no intergranular fracture.Key words : superaustenitic stainless steel, aging, intergranular fracture, tensile properties, fatigue crack growth I N T R O D U C T I O NThe highly-alloyed corrosion resistant austenitic stainless steels, so-called superaustenitic stainless steels, are commonly used for demanding structural applications in ~vere environments. Nitrogen has proved particularly attractive its an alloying element in view of its strengthening [1, 2] and beneficial effect on localized corrosion resistance [3]. High temperature mechanical properties (strength, creep resistance) are also improved by addition of nitrogen [4].The present study was carried out to investigate the effect of aging on the tensile properties and fatigue crack growth behaviour of a superaustenitic stainless steel in air at room temperature RT and at 650~ E X P E R I M E N T A L P R O C E D U R E SThe material used was a commercially av~able superaustenitic stainless steel (18 nun thick plate). The chemical composition (mass%) is 25Ni, 23Cr, 5.5Mo, 0.17N. From the steel plate, a tensile specimen (Fig. l(a)) and a compact tension specimen (Fig. l(b)) were machined so that 1:he loading direction was parallel to the rolling direction. The specimens were aged in air at 650~ for I(XI, 241) and 10(kq h.Tensile test was carried out in the range of RT to 750~ for the as-received specimen, hereafter the as-rec., using a screw-driven tensile testing machine in air at the cross head speed of 0.5 mm/min, i.e. under the strain rate of 4.16• lff 4 s -1. The aged specimen, hereafter the aged, was also tested at RT and 650~Fatigue test (stress ratio R=0.05, cyclic frequency of 1--5 Hz) was

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Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

Xu,

He,

Zhang

et al. 2023

J. Iron Steel Res. Int.

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Seawater resistance of a second generation superaustenitic stainless steel

Cited by 6 publications

References 5 publications

A combined experimental and first-principle study on the oxidation mechanism of super austenitic stainless steel S32654 at 900 °C

A combined experimental and first-principle study on the oxidation mechanism of super austenitic stainless steel S32654 at 900 °C

Tensile properties and fatigue crack propagation of solution-annealed and aged superaustenitic stainless steel

Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

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