Stress corrosion cracking of X-60 line pipe steel in a carbonate-bicarbonate solution
- Univ. of Waterloo, Ontario (Canada). Dept. of Mechanical Engineering
An experimental system was developed to reproduce stress corrosion cracking (SCC) of API X-60 line pipe steels in highly alkaline (pH = 10) carbonate-bicarbonate (1 N sodium carbonate [Na[sub 2]CO[sub 3]] + 1 N sodium bicarbonate [NaHCO[sub 3]]) solutions. Intergranular fracture developed in precracked specimens under very low frequency (40 cycles/day to 400 cycles/day) cyclic loading conditions (minimum to maximum stress ratio [R] of 0.82) at 75 C and [minus]650 mV[sub SCE] that simulated actual pipeline conditions. Crack growth rates were determined following fractographic examination, and a maximum average growth rate of 2.7 [times] 10[sup [minus]7] mm/s was measured. The minimum threshold stress intensity for SCC (K[sub ISCC]) was 25 MPa[radical]m. These findings supported the view that rupture of the passive film is responsible for SCC of pipeline steels under highly alkaline field conditions.
- OSTI ID:
- 6459162
- Journal Information:
- Corrosion (Houston); (United States), Vol. 51:2; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
CARBON STEELS
CRACK PROPAGATION
STRESS CORROSION
PIPELINES
SODIUM CARBONATES
CORROSIVE EFFECTS
FRACTOGRAPHY
GROUND WATER
STRESS INTENSITY FACTORS
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CORROSION
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
STEELS
WATER
360105* - Metals & Alloys- Corrosion & Erosion
360103 - Metals & Alloys- Mechanical Properties
420205 - Engineering- Transport & Storage Facilities- (1980-)