Effect of Ce on the Inclusions and Pitting Resistance of 2Cr13 Stainless Steel

2012 ◽  
Vol 602-604 ◽  
pp. 376-379 ◽  
Author(s):  
Xiao Liu ◽  
Long Mei Wang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Anodic Polarization ◽  
Electrochemical Methods ◽  
Polarization Curves ◽  
Metallographic Examination ◽  
Pitting Corrosion Resistance

The anodic polarization curves of 2Cr13 stainless steel with various RE contents in 3.5% NaCl neutral solutions have been measured by electrochemical methods. The effect of Ce on pitting corrosion resistance of 2Cr13 stainless steel has been studied by the metallographic examination. The results show that sulfide and other irregular inclusions are modified to round or oval-shaped Ce2O2S and CeS after adding Ce to 2Cr13 stainless steel.Ce makes sulfide, and other irregular inclusions change to dispersed round or oval-shaped Ce inclusions, effectively inhibits the occurrence of pitting corrosion, thereby enhancing the corrosion resistance of 2Cr13 stainless steel.

Effect of Rare Earth on the Inclusions and Pitting Resistance of Ferrite Stainless Steel

2012 ◽  
Vol 531 ◽  
pp. 47-50
Author(s):  
Xiao Liu ◽  
Jian She Li
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Anodic Polarization ◽  
Electrochemical Methods ◽  
Polarization Curves ◽  
Metallographic Examination ◽  
Pitting Corrosion Resistance

The anodic polarization curves of 430 ferrite stainless steels with various RE contents in 3.5% NaCl neutral solutions have been measured by electrochemical methods. The effect of RE on pitting corrosion resistance of 430 ferrite stainless steels has been studied by the metallographic examination. The results show that sulfide and other irregular inclusions are modified to round or oval-shaped RE2O2S and RES after adding RE to 430 ferrite stainless steesl. RE makes sulfide, and other irregular inclusions change to dispersed round or oval-shaped RE inclusions, effectively inhibits the occurrence of pitting corrosion, thereby enhancing the corrosion resistance of 430 ferrite stainless steels.

Effect of Rare Earth on the Inclusions and Pitting Resistance of Duplex Stainless Steel

2012 ◽  
Vol 528 ◽  
pp. 130-134
Author(s):  
Xiao Liu ◽  
Long Mei Wang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Duplex Stainless Steel ◽  
Pitting Corrosion ◽  
Anodic Polarization ◽  
Polarization Curves ◽  
Metallographic Examination ◽  
2205 Duplex Stainless Steel ◽  
Pitting Corrosion Resistance

The anodic polarization curves of 2205 duplex stainless steel with various RE contents in 3.5% NaCl neutral solutions have been measured by electrochemical methods, The effect of rare earth on pitting corrosion resistance of 2205 duplex stainless steel has been studied by the metallographic examination. The results show that RE can effectively depress pitting corrosion, while the irregular inclusions of Al2O3, sulfide in the shape of clump are transformed into tiny dispersive round or oval RE inclusions, and it plays a good role in pitting resistance.

Effect of Rare Earth on the Inclusions and Pitting Resistance of Austenitic Stainless Steel

2013 ◽  
Vol 718-720 ◽  
pp. 29-32 ◽  
Author(s):  
Xiao Liu ◽  
Yu Bo
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Austenitic Stainless Steel ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Anodic Polarization ◽  
Austenitic Stainless Steels ◽  
Metallographic Examination ◽  
Pitting Corrosion Resistance

The anodic polarization curves of 21Cr-11Ni austenitic stainless steels with various RE contents in 3.5% NaCl neutral solutions have been measured by electrochemical methods. The effect of RE on pitting corrosion resistance of 21Cr-11Ni stainless steels has been studied by the metallographic examination. The results show that sulfide and other irregular inclusions are modified to round or oval-shaped RE2O2S and RES after adding RE to 21Cr-11Ni stainless steesl. RE makes sulfide, and other irregular inclusions change to dispersed round or oval-shaped RE inclusions, effectively inhibits the occurrence of pitting corrosion, thereby enhancing the corrosion resistance of 21Cr-11Ni austenitic stainless steels.

Pitting Corrosion Resistance Influencing Corrosion Fatigue Behavior of an Austenitic Stainless Steel in Chloride-Containing Environments

CORROSION ◽  
10.5006/3353 ◽  
2020 ◽  
Vol 76 (4) ◽  
pp. 398-410 ◽  
Author(s):  
Helmuth Sarmiento Klapper ◽  
Carlos Menendez ◽  
Sebastian Jesse
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Corrosion Fatigue ◽  
Pitting Corrosion ◽  
Drilling Fluid ◽  
Fatigue Behavior ◽  
Research Work ◽  
Electrochemical Methods ◽  
Pitting Corrosion Resistance

Strain-hardened austenitic stainless steels are commonly used as structural materials in drilling equipment because they meet the demanding requirements in terms of mechanical, magnetic, and chemical properties necessary for drilling technologies in subterranean energy resources exploration. Drilling operational conditions might become a challenge for the integrity of these materials due to the cyclic loading the drillstring is subjected to, in combination with the downhole temperature, and the corrosivity of the drilling fluid. In this research work, the relationship among the pitting corrosion resistance of one Mn-stabilized austenitic stainless steel and its corrosion fatigue behavior has been determined by means of electrochemical methods, advanced surface characterization, and corrosion fatigue testing in brines of near-neutral pH with different chloride contents at room temperature (RT) and 150°C. It has been determined that the corrosion fatigue behavior of the investigated CrMn stainless steel is strongly affected by its susceptibility to pitting corrosion. The synergistic effect between the corrosive environment and the mechanical load depends upon the applied stress amplitude and the pitting resistance of the material. The corrosion fatigue behavior of the austenitic stainless steel at RT was synergistically affected by the environmental and loading conditions at low stress amplitudes. In contrast, the large susceptibility to pitting of the material at 150°C has a significant detrimental effect on its corrosion fatigue behavior when subjected to high stress amplitudes. The observed damage mechanism at 150°C can be described as pitting-induced corrosion fatigue because pit propagation controlled the corrosion fatigue behavior of the CrMn stainless steel. The obtained experimental results have shown that the pitting resistance, assessed for instance by multiple electrochemical methods, could in cases where pitting susceptibility has a large influence on the environmentally sustained cracking mechanism, be used as an indicator of the expected corrosion fatigue behavior of the material. As demonstrated in this study, however, results from accelerated electrochemical testing solely might have a limited prediction capability of long-term corrosion behavior.

NIROSTA 4429

Alloy Digest ◽  
2000 ◽  
Vol 49 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Pitting Corrosion ◽  
Intergranular Corrosion ◽  
Heat Treating ◽  
Low Carbon ◽  
High Nitrogen ◽  
Temperature Performance ◽  
Pitting Corrosion Resistance

Abstract Nirosta 4429 is a low-carbon, high-nitrogen version of type 316 stainless steel. The low carbon imparts intergranular corrosion resistance while the nitrogen imparts both higher strength and some increased pitting corrosion resistance. It is recommended for use as welded parts that need not or cannot be annealed after welding. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-787. Producer or source: ThyssenKrupp Nirosta.

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