Assessment Oxidation Kinetics and Products in SCWR Media of Austenitic ODS Steels With Different Austenite Stabilisers

2014 ◽  
Author(s):  
Maria Mihalache ◽  
Mihail Mihalache ◽  
Iulia Dumitrescu ◽  
Zhangjian Zhou
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Reference Material ◽  
304L Stainless Steel ◽  
Oxide Dispersion ◽  
Water Coolant ◽  
Dispersion Strengthening ◽  
Compatibility Studies ◽  
Nano Oxide ◽  
Ods Steels

In order to fulfil requirements for corrosion resistance for new reactor GIV, the austenitic 304L stainless steel and 18Cr-20Mn austenitic steel were improved by oxide dispersion strengthening (ODS), using two nano-oxide types: titanium and yttrium oxides. Two new ODS steels and a reference material, A/SA-270 grade 304L SS as plate, were characterised by different techniques and its behaviour in SCWR environment was considered. Coolant compatibility studies have been performed in demineralised water at supercritical conditions: temperature of about 550°C and 25 MPa pressure. The oxide developed on the 304ODS samples is layered, thicker and more uniform than on 304L SS. Some oxides grown on 18Cr-20MnODS steel are un-adherently and they are lost in the simulated water coolant. The weight gains of ODS samples are positive and higher than 304L SS up to approximately 1320 hours while on 18Cr-20MnODS steel is negative. The oxide films were investigated by SEM and EDS techniques.

Corrosion Resistance of 9 - 15% Cr ODS Steels and its Comparison with Austenitic Stainless Steel

2013 ◽  
Vol 794 ◽  
pp. 575-582 ◽  
Author(s):  
S. Ningshen ◽  
M. Sakairi ◽  
K. Sukuki ◽  
S. Ukai
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Passive Film ◽  
Intergranular Corrosion ◽  
High Performance ◽  
304L Stainless Steel ◽  
Corrosion Attack ◽  
Ods Steel ◽  
Ods Steels

An oxide dispersion strengthened steels are one of the most promising high temperatures, and high performance advanced structural material being developed for future fast reactors and high-temperature Generation IV reactors. In the present work, the corrosion resistance and its correlation with the passive film compositions of 11% Cr F/M and 9-15% Cr (with Zr or Hf) ODS steels is examined and compared with AISI type 304L stainless steel in boiling 60 - 62% (~13 M) HNO3. The corrosion rate measured in 62% HNO3 for 240 h of 11% Cr F/M, 9% Cr and 15% Cr (Zr) ODS steels show high corrosion rate. On the other hand, low corrosion rate was observed in 304L stainless steel (0. 21 to 23 mm y-1). However, severe intergranular corrosion attack was revealed in type 304L SS after 240 h exposure, but none in ODS steels. Such an intergranular corrosion attack seen in type 304L stainless steel is undesirable. On the contrary, low corrosion rate (0.04 0.15 mm y-1) of 15% Cr (Hf) ODS steel in 3 M, 6 M and 9 M HNO3, comparable to that of type 304L stainless steel was observed. The improved corrosion resistance of 15% Cr (Hf) ODS steel was attributed to enrich (20 at. %) and protective Al2O3 layer formation in addition to Cr2O3 in the passive film.

CARPENTER PROJECT 70+ TYPE 304/304L

Alloy Digest ◽  
2003 ◽  
Vol 52 (2) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Heat Treating ◽  
General Purpose ◽  
304L Stainless Steel ◽  
Type 304 ◽  
Complex Parts

Abstract Carpenter Project 70+ Type 304/304L is a modified version of Type 304/304L stainless steel with improved machinability when compared to conventional 304 (Alloy Digest SS-418, revised September 1997) and 304L (Alloy Digest SS-513, revised November 1997). The alloys are nonhardenable austenitic chromium-nickel steels and are good general-purpose materials for simple and complex parts. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-875. Producer or source: Carpenter Specialty Alloys.

SANDVIK 3R12/4L7

Alloy Digest ◽  
1996 ◽  
Vol 45 (7) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Carbon Steel ◽  
Black Liquor ◽  
Heat Treating ◽  
304L Stainless Steel ◽  
Design Load ◽  
Recovery Boilers ◽  
Major Application ◽  
Outside Diameter

Abstract Sandvik 3R12/4L7 is a composite tube consisting of type 304L stainless steel for corrosion resistance on the outside diameter and having carbon steel (A210 Gr. A1) as the inside component for both water wetted service and the design load. The major application is tubing to handle the corrosive conditions in black liquor recovery boilers. This datasheet provides information on composition, physical properties, microstructure as well as fatigue. It also includes information on forming, heat treating, and joining. Filing Code: SA-482. Producer or source: Sandvik.

scholarly journals Investigation of Microstructure and Corrosion Resistance of Dissimilar Welded Joint between 304 Stainless Steel and Pure Copper

2019 ◽  
Vol 1 (3) ◽  
pp. 76-82
Author(s):  
Sorush Niknamian
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Arc Welding ◽  
Pure Copper ◽  
Welding Process ◽  
Steel Part ◽  
304 Stainless Steel ◽  
Dissimilar Metals ◽  
304L Stainless Steel ◽  
Shielded Metal Arc Welding

Nowadays, welding of dissimilar metals has become significant. In this process, a number of parameters including but not limited to type of electrode, amount of current, preheating temperature, and welding rate, that are essential to be taken into account. For welding of dissimilar metals, various methods are exploited including shielded metal arc welding (SMAW) and gas tungsten arc welding (GTAW). The stimulus for studying welding of 304L stainless steel to pure copper originates from difficulties in joining copper parts of           water-circulating molds to their steel part. In this study, the welding is performed on plates of steel and copper using SMAW, GTAW and combined SMAW+GTAW welding methods with    EL-CuMn2, ENiCrMo-6 and ER70S-4 electrodes. In order to investigate the microstructure and corrosion resistance behavior of welds, the samples were characterized using microstructural study and polarization test. It was observed that among all four welding methods, only combined SMAW+GTAW welding process resulted in successful joint between 304L stainless steel and copper. Both obtained joints possess suitable microstructure and corrosion resistance.

PROJECT 70/PROJECT 7000 STAINLESS TYPE 304L

Alloy Digest ◽  
1997 ◽  
Vol 46 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Heat Treating ◽  
304L Stainless Steel ◽  
Aisi Type

Abstract Project 70 and Project 7000 Type 304L stainless steels are improved machining versions of conventional AISI Type 304L stainless steel. They have higher tensile and creep strengths than conventional 18-8 stainless steels. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-513. Producer or source: Carpenter. Originally published July 1990, revised November 1997.

MAXIVAL MVAISL

Alloy Digest ◽  
2006 ◽  
Vol 55 (10) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Tensile Properties ◽  
304L Stainless Steel ◽  
Oxide Inclusions ◽  
Aisi Type

Abstract Maxival MVAISL is an enhanced-machining version of AISI Type 304L stainless steel. The alloy has a specified inclusion picture to enhance machining by modifying both sulfide and oxide inclusions. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming and machining. Filing Code: SS-978. Producer or source: Valbruna Stainless Inc.

Oxidation/Dissolution of Ferritic ODS Steels in Static Lead With Various Oxygen Contents at 650°C

2013 ◽  
Author(s):  
Valentyn Tsisar ◽  
Olga Yeliseyeva ◽  
Jürgen Konys
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Oxide Film ◽  
Steel Structure ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Interaction Mode ◽  
Lead Melts ◽  
Ods Steels

The compatibility of ferritic oxide dispersion strengthened (ODS) steels with static liquid Pb at 650°C was investigated for up to 1750 h. The dependence of corrosion behavior on oxygen concentration in the melt and steel structure was determined. The interaction mode changed from intensive oxidation in the oxygen-saturated melt, accompanied by the formation of a bi-layer magnetite/spinel scale, to formation of a thin Cr-based oxide film in oxygen-doped melt and to the severe steel dissolution in oxygen-free lead. The viability of the in-situ formed Cr-based oxide film, as a promising way to improve the corrosion resistance of steels in the high-temperature (T > 550°C) lead melts is discussed.

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