Exam 1: Corrosion and Materials

Which of the following materials are susceptible to nitriding?

Decarburization results in a __________, which can be confirmed by hardness testing.

For some materials such as titanium, carbon steel and low alloy steel, the number of cycles to fatigue fracture decreases with ________ until an endurance limit is reached. Below this endurance limit, fatigue cracking will not occur, regardless of the number of cycles.

Stress relief and stabilization heat treatment of 300 Series SS for maximizing chloride SCC and PASCC resistance can cause ____________ problems, especially in thicker sections.

Which of these materials are not susceptible to PASCC?

_________ acid is most often used as a catalyst in polymerization units.

Cracking susceptibility increases with __________ pH and carbonate concentration.

Key factors affecting thermal fatigue are the magnitude of the temperature and the __________.

For carbon steel, common velocity limits are generally limited to _________ fps for rich amine and _______ fps for lean amine.

___________ cracking has been a major problem in coke drum shells.

Which of the following materials is affected by high temperature corrosion?

Which of these materials is not susceptible to amine cracking?

Carbon dioxide corrosion results when CO₂ dissolves in water to form _________ acid.

Protection in a boiler from boiler feed water corrosion is accomplished by:

Regular and controlled carbon grades of stainless steels such as types 304/304H and 316/316H are particularly susceptible to sensitization in the weld HAZ. Low carbon "L" grades are less susceptible and usually can be welded without sensitizing. The "L" grades will not sensitize provided long term operating temperatures do not exceed about __________.

The creep threshold temperature for carbon steel is ________.

Temper embrittlement _________ be prevented if the material contains critical levels of the embrittling impurity elements and is exposed in the embrittling range.

Caustic stress corrosion cracking typically propagates _______ to the weld in adjacent base metal but can occur in the weld deposit or heat affected zone.

Although cracks may be seen visually, crack detection for caustic stress corrosion cracking is best detected by WFMT, EC, RT and ______.

With short term overheating, time to failure will ___________ as internal pressures or loading decrease.