Stress corrosion cracking resistance of 22% Cr duplex stainless steel in simulated sour environments

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Corrosion (Houston); (USA)

DOI:https://doi.org/10.5006/1.3584990· OSTI ID:7010188

Kudo, T; Tsuge, H; Moroishi, T ^[1]

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1. Technical Research Labs., Sumitomo Metal Industries, Ltd., 1-3 Nishinagosu-Hondori, Amagasaki (JP)

This paper reports the effect of nickel and nitrogen contents on stress corrosion cracking (SCC) of 22%Cr {minus} 3%Mo-base duplex stainless steel investigated in simulated sour environments with respect to both the base metal and the heat-affected zone (HAZ) of welding. The threshold stress and the critical chloride concentration for SCC were evaluated as a function of the ferrite content ({alpha}-content) in the alloy. The threshold stress is highest at the {alpha}-content of 40 to 45%, and is lowered with decreasing and increasing the {alpha}-content from its value. The alloy whose {alpha}-content exceeds 80% at the HAZ has also high susceptibilities to pitting corrosion and intergranular corrosion (ICG). The critical chloride concentration for cracking increases with the decrease in the {alpha}-content. Moreover, the contents of chromium, nickel and molybdenum in the {alpha}-phase are considered to be an important factor for determining the critical chloride concentration.

• OSTI ID: 7010188
• Journal Information: Corrosion (Houston); (USA), Journal Name: Corrosion (Houston); (USA) Vol. 45:10; ISSN 0010-9312; ISSN CORRA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALLOYS
CARBON ADDITIONS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CORROSIVE EFFECTS
CRACK PROPAGATION
ELECTROCHEMICAL CORROSION
ELEMENTS
FERRITE
HALIDES
HALOGEN COMPOUNDS
HIGH ALLOY STEELS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
METALS
MOLYBDENUM ALLOYS
NATURAL GAS PROCESSING PLANTS
NICKEL
NITROGEN
NONMETALS
PITTING CORROSION
SIMULATION
STAINLESS STEELS
STEELS
STRESS CORROSION
TRANSITION ELEMENTS