Menu
Search
Filters
Close
Menu

98099 UNDERSTANDING THE HIGH TEMPERATURE CORROSION BEHAVIOUR OF MODIFIED 13% Cr MARTENSITIC OCTG

Picture for 98099 UNDERSTANDING THE HIGH TEMPERATURE CORROSION
Available for download
Product Number: 51300-98099-SG
ISBN: 98099 1998 CP
Author: Peter Felton, Michael John Schofield
$0.00
$20.00
$20.00
Recent efforts by manufacturers of OCTG have led to the development of several new grades of modified or ‘supermartensitic’ tubulars. The main feature of these products is improved corrosion performance at high temperatures (above 13O°C), i.e. in conditions which standard 13Cr, based on type 420 chemistry, corrodes at a rate too high to permit its use. In order to study these new materials, laboratory corrosion tests have been conducted, in conditions in which the standard 13Cr (API 5CT L80) suffers severe corrosion. The H2S partial pressure in these tests was in the range 0.01 - 0.1 bar (1 - 10 kPa). It was found that the general corrosion rate of the modified alloy was approximately one-tenth of that of the standard 13Cr, and the pitting rate was reduced by a factor of 3 - 4. Observation of the samples after test revealed the presence of coloured interference films on the modified materials, whereas the standard 13Cr was different in having a corrosion product on its surface. This was less adherent and protective than the film on the modified mat-tensitics. Electrochemical testing has confirmed that the corrosion behaviour of the modified martensitics falls between that of the standard 13Cr (which tends to corrode generally) and that of 22Cr duplex in the same conditions (which is fully passive). Keywords: martensitic stainless steels, standard 13Cr, modified 13Cr, corrosion, interference films, electrochemical testing.
Recent efforts by manufacturers of OCTG have led to the development of several new grades of modified or ‘supermartensitic’ tubulars. The main feature of these products is improved corrosion performance at high temperatures (above 13O°C), i.e. in conditions which standard 13Cr, based on type 420 chemistry, corrodes at a rate too high to permit its use. In order to study these new materials, laboratory corrosion tests have been conducted, in conditions in which the standard 13Cr (API 5CT L80) suffers severe corrosion. The H2S partial pressure in these tests was in the range 0.01 - 0.1 bar (1 - 10 kPa). It was found that the general corrosion rate of the modified alloy was approximately one-tenth of that of the standard 13Cr, and the pitting rate was reduced by a factor of 3 - 4. Observation of the samples after test revealed the presence of coloured interference films on the modified materials, whereas the standard 13Cr was different in having a corrosion product on its surface. This was less adherent and protective than the film on the modified mat-tensitics. Electrochemical testing has confirmed that the corrosion behaviour of the modified martensitics falls between that of the standard 13Cr (which tends to corrode generally) and that of 22Cr duplex in the same conditions (which is fully passive). Keywords: martensitic stainless steels, standard 13Cr, modified 13Cr, corrosion, interference films, electrochemical testing.
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 98094 THE APPLICATION LIMITS OF ALLOYED 13%Cr
Available for download

98094 THE APPLICATION LIMITS OF ALLOYED 13%Cr TUBULAR STEELS FOR DOWNHOLE DUTIES

Product Number: 51300-98094-SG
ISBN: 98094 1998 CP
Author: P. J. Cooling, M. B. Kennani, J. W. Martin, P. I. Nice
$20.00
Picture for 98096 APPLICATION OF MARTENSITIC, MODIFIED
Available for download

98096 APPLICATION OF MARTENSITIC, MODIFIED MARTENSITIC AND DUPLEX STAINLESS STEEL BAR STOCK FOR COMPLETION EQUIPMENT

Product Number: 51300-98096-SG
ISBN: 98096 1998 CP
Author: Rashmi B. Bhavsar, Raimondo Montani
$20.00
Picture for 97028 CORROSION PERFORMANCES OF MODIFIED
Available for download

97028 CORROSION PERFORMANCES OF MODIFIED 13Cr FOR OCTG IN OIL AND GAS ENVIRONMENTS

Product Number: 51300-97028-SG
ISBN: 97028 1997 CP
Author: B.J. ORLANS-JOLIET, C.P. LINNE, F. BLANCHARD, G.C. GUNTZ
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support