P 2000 - a New Austenitic High Nitrogen Steel for Power Generating Equipment

Stein, G.; Hucklenbroich, I.; Wagner, Matthias

doi:10.4028/www.scientific.net/msf.318-320.167

Cited by 17 publications

(9 citation statements)

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“…High‐nitrogen austenitic stainless steels (HNASS) own not only low cost but also excellent mechanical properties, corrosion resistance, oxidization resistance, wearability, etc . However, the precipitation of the second phases may occur in HNASS during thermal processes, welding, service at elevated temperatures, which will heavily damage various working, service properties of the steel .…”

Section: Introductionmentioning

confidence: 99%

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Shi

et al. 2013

steel research int.

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Effects of different treatments (solid solution + cold deformation + aging condition) on the microstructure of Fe–18Cr–18Mn–0.63N high‐nitrogen austenitic stainless steel and consequently on its mechanical properties were investigated by microscopic observations and mechanical characterizations. For un‐cold‐deformed and 20% cold‐deformed steels, the results show that, all precipitates are Cr2N phase and the granular precipitates transform into cellular precipitates with increasing aging time. However, in 50% cold‐deformed steel only the granular and massive Cr2N precipitates. On the other hand, no cellular Cr2N precipitates are observed, but the precipitation of σ phase is induced. In un‐cold‐deformed steel, all tensile properties including the ultimate tensile strength, yield strength, and the elongation decrease with increasing aging time, resulting from the precipitation of the second phase. In the cold‐deformed steels, the tensile and yield strengths decrease while the elongations firstly increase and then decrease with aging time. Actually, in the cold‐deformed steels, the strain recovery or recrystallization mainly causes the decreases in tensile and yield strength in addition to increase in elongation after aged for 1 h. In contrast, the cellular Cr2N precipitation or granular precipitation mainly results in the continually slow decreases in tensile and yield strengths and the relevant decrease in elongation with aging.

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Section: Introductionmentioning

confidence: 99%

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Shi

et al. 2013

steel research int.

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“…Describing the interaction coefficient of alloy component X as f N (X) , the f N (alloy) is given by [5] Expansion of Eq. [5] (in regular logarithm form) to the secondary terms on each alloying component gives [6] where are the interaction parameters of alloy component X and Y on nitrogen. Substitution of Eq.…”

Section: A Thermodynamics On Nitrogen Gas Absorption Into Solid Solumentioning

confidence: 99%

“…[1,4,5] Therefore, the processing and properties of high nitrogen stainless steels have being widely studied for the purpose of complying with the increased demands on stainless steels for structures in chemical and energy industries, [6,7] marine and offshore environments, [7,8] surgical and dental applications, 9 and so on. However, the nitrogen content of the industrially produced materials is 0.4 pct at most, that is to say, we do not make the most of the advantages of nitrogen addition.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of ultrahigh nitrogen austenitic steels by nitrogen gas absorption into solid solution

Tsuchiyama

Takaki

Ito

et al. 2003

Metall Mater Trans A

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For the purpose of fabricating ultrahigh nitrogen austenitic steels (Ͼ1 mass pct N), the phenomenon of nitrogen absorption into solid solution was thermodynamically analyzed and applied to Fe-Cr-Mn system ternary alloy. During the annealing of the steel in a nitrogen gas atmosphere of 0.1 MPa at 1473 K (nitrogen absorption treatment), the nitrogen content of the steel was increased with the absorption of nitrogen gas from the material surface and then saturated when the system reached a state of equilibrium. Effect of the steel composition on an equilibrium nitrogen content was formulated taking account of interactions among Cr, Mn, and N atoms, and the condition for fabrication of ultrahigh nitrogen austenitic steels was clarified. The nitrogen addition to ultrahigh content markedly increased proof stress and tensile stress of the austenitic steels without losing moderate ductility. For example, Fe-24Cr-10Mn-1.43N (mass pct) alloy has 830 MPa in 0.2 pct proof stress, 2.2 GPa in true tensile stress, and 75 pct in total elongation. As a result of tensile tests for various nitrogen-bearing austenitic steels, it was found that the proof stress is increased in proportion to (atomic fraction of nitrogen) 2/3 .

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“…The steel X8CrMnN18‐18 with 0.55 mass% nitrogen has been the standard grade for hot worked non‐magnetic retaining rings, cold expanded to a yield strength of 1150 to 1350 MPa 1. The steel X5CrMnMoN 18‐18 with 0.85 mass% N was produced by pressurised electro‐slag‐remelting (PESR) to further increase the strength and corrosion resistance 2. Recent investigations showed 3, 4 that even better mechanical properties were obtained, if carbon was added to austenitic CrMnN steels and that these CrMnCN steels were melted at normal pressure of air and therefore at lower costs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon on Stainless Austenitic CrMnCN Steel Castings

Berns

Hussong

Riedner

et al. 2010

steel research int.

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The effect of up to 0.5 mass% C on a steel with 18 to 19 mass% Cr and Mn each and about 0.6 mass% N was investigated by tensile tests, notch impact tests and corrosion tests. The experimental results show that the solution anneal temperature and the sensitisation to intercrystalline corrosion depend on the carbon content which raise the strength and cold work hardening. Up to 1 mass% CþN the ductile to brittle transition temperature remains at about À90 8C. Corrosion in diluted aqueous solutions of H 2 SO 4 , HCl and NaCl is described.

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P 2000 - a New Austenitic High Nitrogen Steel for Power Generating Equipment

Cited by 17 publications

References 0 publications

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Fabrication of ultrahigh nitrogen austenitic steels by nitrogen gas absorption into solid solution

Effect of Carbon on Stainless Austenitic CrMnCN Steel Castings

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