Nitric acid corrosion of austenitic stainless steels

2007 ◽  
Vol 9 (1) ◽  
pp. 1-10 ◽  
Author(s):  
J. M. West
Keyword(s):  
Nitric Acid ◽  
Stainless Steels ◽  
Acid Corrosion ◽  
Austenitic Stainless Steels

NSSMC-NAR-SN-1, SN-3, SN-5

Alloy Digest ◽  
2016 ◽  
Vol 65 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Nitric Acid ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Austenitic Stainless Steels

Abstract NSSMC-NAR-SN-1, SN-3, and SN-5 are austenitic stainless steels with corrosion resistance to nitric acid. The alloys can be abbreviated as NSSMC-NAR-SN-1: LC-17Cr-14Ni-4Si, NSSMC-NAR-SN-3: LC-11Cr-17Ni-6Si-Zr-Ti, and NSSMC-NAR-SN-5: LC-27Cr- 8Ni-Si-N. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming. Filing Code: SS-1237. Producer or source: Nippon Steel and Sumitomo Metal Corporation.

Development of Fit-for-Purpose Austenitic Stainless Steels With High Polythionic Acid Stress Corrosion Resistance

2017 ◽  
Author(s):  
Takahiro Osuki ◽  
Masahiro Seto ◽  
Hirokazu Okada ◽  
Masayuki Sagara ◽  
Satoshi Matsumoto ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stainless Steels ◽  
Acid Corrosion ◽  
Acid Stress ◽  
Austenitic Stainless Steels ◽  
Total Acid ◽  
Term Operation ◽  
Stabilization Treatment ◽  
Fit For Purpose

In the process units with Polythionic Acid Stress Corrosion Cracking (PTA-SCC) such as hydrotreater or hydrocracker, the neutralization treatment like soda ash washing and/or PWHT, Post Weld Heat Treatment, are conducted for stabilized austenitic stainless steels of TP321H or TP347H to mitigate the potential of PTA-SCC. 347AP, the proprietary version of Type 347LN, is remarkable for the possibility to save the fabrication and turnaround cost by the elimination of the neutralization treatment and/or PWHT and its reliability to PTA-SCC resistance without PWHT and neutralization was proven by the long-term service experience. However it has not been investigated the difference between 347AP and TP347H for the Stress Relaxation (SR) cracking resistance of welded joint required for the long term operation at elevated temperature. On the other hand, in atmospheric distillation units and vacuum distillation units using the crude containing high Total Acid Number (TAN), the resistances to both Naphthenic Acid Corrosion (NAC) and PTA-SCC are required by elevating the design temperature. Therefore, Fit-for-purpose austenitic stainless steels with high PTA-SCC resistance without stabilization treatment are required for the complicated environment with the variation of temperature, pressure and fluid in petroleum refinery process using the crude containing high S content. In this study, SR cracking susceptibility of 347AP is investigated and it is found that 347AP has lower SR cracking susceptibility than TP347H without stabilization treatment. Next, in order to improve NAC resistance compared with 347AP, the effect of Mo, Cu and W contents to NAC are investigated based on 347AP, and it is clarified that the increase of Mo content greater than 3% is the most effective to improve NAC resistance. Moreover, the conventional welding filler with the similar NAC and PTA-SCC resistances to base metal is investigated, and it is reported that ER NiCrCoMo-1 filler was recommended for the welding fabrication of Fit-for-purpose austenitic stainless steels with high PTA-SCC resistance.

Corrosion assessment of nitric acid grade austenitic stainless steels

2009 ◽  
Vol 51 (2) ◽  
pp. 322-329 ◽  
Author(s):  
S. Ningshen ◽  
U. Kamachi Mudali ◽  
G. Amarendra ◽  
Baldev Raj
Keyword(s):  
Nitric Acid ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Corrosion Assessment

Corrosion Resistance of Molybdenum Modified Cr-Ni-Mn Austenitic Stainless Steels

CORROSION ◽  
1963 ◽  
Vol 19 (6) ◽  
pp. 210t-216t ◽  
Author(s):  
F. NAIR ◽  
M. SEMCHYSHEN
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Delta Ferrite ◽  
Ferritic Stainless Steels ◽  
Acidic Conditions

Abstract The corrosion resistance of nine Cr-Ni-Mn austenitic and duplex austenitic-ferritic stainless steels, containing up to 5 percent molybdenum, in hot deaerated sulfuric acid and boiling concentrated nitric acid was determined and compared to the behavior of recognized commercial grades. A limited evaluation of mechanical properties was performed. The corrosion resistance of these alloys was affected by molybdenum additions in a manner similar to that observed in Cr-Ni austenitic steels:The ability to tolerate minimal oxidizing environments such as sulfuric acid was markedly improved.The resistance toward strongly oxidizing acidic conditions was reduced. The presence of delta ferrite effected improved resistance in sulfuric acid and materially diminished corrosion resistance in hot nitric acid.

Effect of Cold Work on the Corrosion Resistance of Nonsensitized Austenitic Stainless Steels in Nitric Acid

CORROSION ◽  
1976 ◽  
Vol 32 (6) ◽  
pp. 229-238 ◽  
Author(s):  
CHRISTOPHER HAHIN ◽  
ROBERT M. STOSS ◽  
BRUCE H. NELSON ◽  
PHILIP J. REUCROFT
Keyword(s):  
Corrosion Resistance ◽  
Nitric Acid ◽  
Stainless Steels ◽  
Cold Work ◽  
Austenitic Stainless Steels

Austenitic Stainless Steels for Back End of Nuclear Fuel Cycle

2013 ◽  
Vol 794 ◽  
pp. 530-538 ◽  
Author(s):  
U. Kamachi Mudali
Keyword(s):  
Nitric Acid ◽  
Nuclear Fuel ◽  
Stainless Steels ◽  
Life Prediction ◽  
Austenitic Stainless Steels ◽  
Corrosion And Wear ◽  
Operating Conditions ◽  
Processing Technologies ◽  
Nitrogen Alloying

Austenitic stainless steels have received much attention in recent years due to their excellent combination of corrosion, mechanical and wear properties. They are finding wide applications in chemical, power, oil, refinery, biomedical, marine sectors and other industries where both good mechanical properties and excellent corrosion and wear resistances are demanded. In the spent nuclear fuel reprocessing plants and waste storage and processing plants involving nitric acid as the main process medium, type 304L stainless steels (SS) are employed as work horse materials for manufacturing more than 90% of the plant components. Though these alloys form a protective Cr2O3 passive film over the surface in nitric acid under plant operating conditions, they undergo various types of corrosion failures in service. Welding and other metallurgical parameters including alloying elements, cold working, heat treatment etc. degrade the performance of the alloy in service. For qualifying the alloy for plant applications, ASTM A262 practice A and C are currently employed, however, long term performance under simulated plant operating conditions is necessary to understand the failure modes and life prediction of components. Today, nitrogen represents an economically, environmentally, attractive and versatile alloying element to steels and stainless steels. The beneficial effect of nitrogen alloying in stainless steels are manifolds, including solid solution strengthening, precipitation effects, phase control and corrosion and wear resistances. Recent years have seen a rapid development of these alloys with improved properties owing to advances in alloy processing technologies. The objective of the lecture is to bring out the various corrosion issues in reprocessing plants, short term laboratory versus long term field corrosion data, modeling for life prediction, effect of redox ions, nitrogen alloying, welding and corrosion damage, etc. and highlight the remedial actions to overcome the shortcomings due to corrosion issues.

Corrosion Resistance of Sintered Austenitic Stainless Steels in Boiling Nitric Acid

1997 ◽  
Vol 36 (1) ◽  
pp. 65-72 ◽  
Author(s):  
E. Otero ◽  
A. Pardo ◽  
E. Sáenz ◽  
M. V. Utrilla ◽  
F. J. Pérez
Keyword(s):  
Corrosion Resistance ◽  
Nitric Acid ◽  
Stainless Steels ◽  
Austenitic Stainless Steels
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