SCC generally occurs below about _______.
A. 150º F
B. 180º F
C. 210º F
D. 240º F
Amine cracking has been reported down to ambient temperatures with some amines. __________ temperatures and stress levels _______ the likelihood and severity of cracking.
A. Increasing increases
B. Increasing, decreases
C. Decreasing increases
D. Increasing, reduces
Refractory anchor material must be compatible with the _________ of the base metal
A. Composition
B. Welding
C. Thermal coefficient
D. Ductility
_________ material sections also have a ___________ resistance to brittle fracture due to higher constraint, which increases triaxial stresses at the crack tip.
A. Thinner, Lower
B. Thicker, Lower
C. Thinner, Higher
D. Thicker, Higher
Low creep ductility is __________ severe in high tensile strength materials and welds.
A. More
B. Less
C. Usually
D. Not
Conditions favoring carburization include a high gas phase carbon activity and _______ oxygen potential.
A. Low
B. High
C. Negative
D. Positive
Type 304L SS is satisfactory for phosphoric acid concentration of 100% up to about _________. Type 321 is required from there to 225º F.
A. 140º F
B. 150º F
C. 100º F
D. 120º F
____________ is a form of environmental cracking that can initiate on the surface of high strength low alloy steels and carbon steels with highly localized zones of high hardness in the weld metal and HAZ as a result of exposure to aqueous HF acid service.
A. Sulfide stress cracking
B. Hydrogen stress cracking
C. Caustic stress cracking
D. Hydrogen induced cracking
Which of the following does not increases the likelihood of atmospheric corrosion?
A. Bird poop
B. Increasing annual rainfalls
C. Locations where moisture is trapped
D. Increasing operating pressures
E. Increasing amounts of airborne contaminates
It is generally accepted that stresses approaching _________ are required for SCC to occur so that thermal stress relief is effective in preventing caustic SCC.
A. MAWP
B. Yield
C. Creep range
D. Critical
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