Stress corrosion cracking of X-60 line pipe steel in a carbonate-bicarbonate solution

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3293588· OSTI ID:6459162

Pilkey, A K; Lambert, S B; Plumtree, A ^[1]

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1. 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), Journal Name: Corrosion (Houston); (United States) Vol. 51:2; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
420205 -- Engineering-- Transport & Storage Facilities-- (1980-)
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBON STEELS
CARBONATES
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
CRACK PROPAGATION
FRACTOGRAPHY
GROUND WATER
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
OXYGEN COMPOUNDS
PIPELINES
SODIUM CARBONATES
SODIUM COMPOUNDS
STEELS
STRESS CORROSION
STRESS INTENSITY FACTORS
WATER