The Effects of Dissolved Oxygen, Chloride Ion and Applied Potential on the SCC Behavior of Type 304 Stainless Steel in 290 C Water

CORROSION ◽  
1980 ◽  
Vol 36 (8) ◽  
pp. 409-415 ◽  
Author(s):  
P. A. ANDRESEN ◽  
D. J. DUQUETTE
Keyword(s):  
Stainless Steel ◽  
Dissolved Oxygen ◽  
Chloride Ion ◽  
304 Stainless Steel ◽  
Applied Potential ◽  
Type 304 ◽  
Type 304 Stainless Steel

Electropolishing of Type 304 Stainless Steel in an Amide Type Ionic Liquid Containing Chloride Ion

2020 ◽  
Vol MA2020-02 (68) ◽  
pp. 3662-3662
Author(s):  
Nitaro Yuza ◽  
Nobuyuki Serizawa ◽  
Yasushi Katayama
Keyword(s):  
Stainless Steel ◽  
Ionic Liquid ◽  
Chloride Ion ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel

The Effect of Dissolved Oxygen and NO3− Anions on the Stress Corrosion Cracking of Type 304 Stainless Steel in Water at 290 C

CORROSION ◽  
1983 ◽  
Vol 39 (8) ◽  
pp. 313-322 ◽  
Author(s):  
H. Hirano ◽  
N. Aoki ◽  
T. Kurosawa
Keyword(s):  
Stainless Steel ◽  
Oxide Film ◽  
Dissolved Oxygen ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Oxide Films ◽  
Corrosion Cracking ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel

Abstract The effect of dissolved oxygen and NO3− anions on the intergranular stress corrosion cracking (IGSCC) and transgranular stress corrosion cracking (TGSCC) of Type 304 stainless steel has been studied in water at 290 C by using the constant extension rate tests (CERT) method. A strain rate of 3.33×10−6 sec−1 was applied. TGSCC occurred in water containing less than 100 ppb dissolved oxygen, while IGSCC occurred at concentrations greater than 1 ppm dissolved oxygen. IGSCC was accelerated by the addition of small amounts of NO3− anions, but TGSCC was suppressed by the presence of this anion. The analyses of oxide films by the Ion Microprobe Mass Analyzer (IMMA) and the construction of potential-pH diagrams for Cr-H2O, Ni-H2O, and Fe-H2O systems at 290 C were performed to consider the effect of dissolved oxygen and NO3− anions on IGSCC and TGSCC. The IMMA studies revealed that the compositions of the oxide films of Type 304 stainless steel and Fe-12Cr-9.3Ni steel (the presumed composition of grain boundaries in sensitized Type 304 stainless steel) were Cr-enriched at 200 ppb O2 level. At 1 ppm O2 level, the oxide film of Type 304 stainless steel was composed of Cr-enriched phase, but the Cr content in the oxide film of Fe-12Cr-9.3Ni steel was low. At 10 ppm O2 level, the oxide film of Type 304 stainless steel was composed of Fe and Cr, but the oxide film of Fe-12Cr-9.3Ni steel was mainly composed of Fe. The potential-pH diagram for the Cr-H2O system at 290 C indicated that the corrosion potential of Type 304 stainless steel lay in the stable potential region of Cr2O3 at low oxygen levels. On the other hand, at high oxygen levels, the corrosion potential of Type 304 stainless steel lies near the unstable potential region of Cr2O3. This unstable region corresponds to the potential at which Cr2O3 dissolves as dichromate ion (Cr2O7−−) or chromate ion (CrO4−−). The relationship between the characteristics of oxide films and the IGSCC and TGSCC of sensitized Type 304 stainless steel is discussed.

URANUS 35N

Alloy Digest ◽  
1996 ◽  
Vol 45 (7) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion Cracking ◽  
Chloride Ion ◽  
Pressure Vessels ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Better Than

Abstract Uranus 35N is a duplex stainless steel with a microstructure consisting of austenite and ferrite close to 50/50. It has corrosion resistance and strength better than type 304 stainless steel. Applications include pressure vessels for weight savings and where more resistance to chloride-ion stress-corrosion cracking is needed. This datasheet provides information on composition and physical properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: SS-648. Producer or source: Creusot-Marrel.

scholarly journals Stress Corrosion Crack Growth Rates in Type 304 Stainless Steel in Simulated BWR Environments

1986 ◽  
Vol 108 (1) ◽  
pp. 20-25 ◽  
Author(s):  
J. Y. Park ◽  
W. E. Ruther ◽  
T. F. Kassner ◽  
W. J. Shack
Keyword(s):  
Growth Rate ◽  
Stainless Steel ◽  
Dissolved Oxygen ◽  
Crack Growth ◽  
Growth Rates ◽  
Load Ratio ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Crack Growth Rates

Stress corrosion cracking of Type 304 stainless steel has been studied with fracture-mechanics-type standard 25.4-mm-thick compact tension specimens in simulated boiling-water reactor environments at 289°C and 8.3 MPa. Tests were performed with either constant or cyclic loading. The latter tests used a positive sawtooth waveform with an unloading time of 1 or 5 s, a load ratio R (minimum load to maximum load) of 0.2 to 0.95, and a frequency f of 8 × 10−4 to 1 × 10−1 Hz. Crack lengths and crack growth rates were determined by the compliance method; crack mouth opening displacement was measured with in-situ clip gauges. Fractography was used to examine the mode of cracking and to confirm the compliance method for crack length determination. The test environments were high-purity deionized water with 0.2- to 8-ppm dissolved oxygen, and water with 0.2-ppm dissolved oxygen and 0.1-ppm sulfate (as H2SO4). Two heats with a carbon content of 0.06 wt percent were investigated in solution-heat-treated and furnace-sensitized conditions. Degree of sensitization varied from ∼0 to 20 C/cm2 as measured by the electrochemical potentiokinetic polarization method. The first heat was tested in water with 0.2- and 8-ppm dissolved oxygen and with 0.2-ppm dissolved oxygen and 0.1-ppm sulfate. The loading conditions encompassed the range f=8×10−2 to 8 × 10−4 Hz, Kmax=28 to 72 MPa•m1/2, and R = 0.95. Under these conditions, the crack growth rates were ∼0 to 3 × 10−9 m/s. The effects of water chemistry transients which produced changes in the concentration of dissolved oxygen or sulfate in the environment were also investigated. The second heat was tested in water with 8-ppm dissolved oxygen. The influence of load ratio and frequency was investigated over the range R = 0.5 to 1.0 and f = 1 × 10−1 to 2 × 10−3 Hz, at maximum stress intensity Kmax = 28 to 38 MPa•m1/2. Under these conditions, crack growth rates varied from 1 × 10−10 to 3 × 10−9 m/s. Crack growth rate increased significantly at low R values. However, the growth rate at R = 0.95 was not significantly different from that under constant load. Correlation of the crack growth rate data with crack-tip strain rates is discussed.

OUTOKUMPU TYPE 630

Alloy Digest ◽  
2016 ◽  
Vol 65 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
High Performance ◽  
High Strength ◽  
Heat Treating ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel

Abstract Outokumpu Type 630 is a martensitic age hardenable alloy of composition 17Cr-4Ni. The alloy has high strength and corrosion resistance similar to that of Type 304 stainless steel. 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, and joining. Filing Code: SS-1238. Producer or source: Outokumpu High Performance Stainless.

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