Sulphide stress cracking susceptibility of C/Mn and Cr/Mo steels in repair welding
- CANMET, Ottawa, Ontario (Canada). Metals Technology Labs.
- Ontario Hydro, Toronto, Ontario (Canada)
Low-alloy steels containing chromium and molybdenum as alloying elements are extensively used in the power generating and petroleum industries. Of these, 2.25Cr-1 Mo and 1.25Cr-0.5Mo ferritic steels have been a logical choice for power plants and pressure vessels. Hydrogen in steel is a serious problem since hydrogen-induced failures are common. It has caused numerous failures during construction and during service. Sulphide stress cracking (SSC) failure in welded structures often occurs in the weld metal and heat-affected zone (HAZ); the rapid heating and cooling during welding produces a hardened microstructure and residual stresses, which makes these regions vulnerable to cracking. The corrosion behavior of C/W and Cr/Mo steels and sulphide-stress cracking (four-point bend test) was investigated in NACE solutions TM0177 and TM0284 containing hydrogen sulphide (H{sub 2}S). The results obtained from the present studies will be presented and discussed. The data indicated that hardness was the primary factor controlling the SSC resistance of these steels.
- OSTI ID:
- 70063
- Report Number(s):
- CONF-940222--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM-MOLYBDENUM STEELS
CORROSION RESISTANCE
CORROSIVE EFFECTS
CRACK PROPAGATION
EXPERIMENTAL DATA
FIELD PRODUCTION EQUIPMENT
HARDNESS
HYDROGEN EMBRITTLEMENT
HYDROGEN SULFIDES
METALLOGRAPHY
PETROLEUM INDUSTRY
STEEL-ASTM-A516
STRESS CORROSION
THERMAL POWER PLANTS
WELDED JOINTS
YIELD STRENGTH