The endurance limit is usually about:
A. 10-20% of a material's ultimate tensile strength.
B. 40-50% of a material's ultimate tensile strength
C. 10-20% of a material's yield strength.
D. 40-50% of a material's yield strength.
E. Half way up the ladder of a 150' column (tower).
What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic
Corrosion rates of the anode will be less affected if there is a _________ anode to cathode ratio.
A. Large
B. Small
C. Severe
D. None of the above
Which of the following materials is not susceptible to SCC?
A. Carbon steel
B. 300 Series SS
C. Low alloy steel
D. Both A and C
Fatigue cracks usually initiate on the surface at notches or __________ under cyclic loading.
A. Branches
B. Laterals
C. Stress concentrations
D. Grinding marks
Geometry, stress level, number of cycles and _________ are the predominate factors in determining the fatigue resistance of a component.
A. Temperature
B. Material properties
C. Pressure
D. Velocity
For a specific material, HTHA is dependent on temperature, hydrogen partial pressure, time and _________.
A. Stress
B. Pressure
C. Velocity
D. Alloy composition
____________ is often found in piping and equipment that handles caustic, including H²S and mercaptan removal units, as well as equipment that uses caustic for neutralization in sulfuric acid and HF acid units.
A. Carburization
B. Sulfide corrosion
C. Caustic embrittlement
D. Hydrogen cracking
To prevent carburization, select alloys with a strong surface oxide or sulfide film former such as ________.
A. Silicon
B. Molybdenum
C. Aluminum
D. Both A and C
All piping and equipment exposed to HF acid at any concentration with hardness levels above ________ are subject to hydrogen stress cracking.
A. 200 BHN
B. 210 BHN
C. 227 BHN
D. 237 BHN
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