Exam 1: Corrosion and Materials

High strength, low allow steels such as A193-B7 bolts and compressor parts are susceptible to hydrogen stress cracking. A193-B7M bolts are susceptible if __________.

When carbon is absorbed into a material at elevated temperatures while in contact with a carbonaceous substance it is called carburization. Temperatures usually have to be above __________ for this to occur.

300 Series SS is susceptible to LME when it comes in contact with molten ________.

Erosion-corrosion is a description for the damage that occurs when corrosion contributes to erosion by removing protective films or scales, or by exposing the metal surface to further ________ under the combined action of corrosion-erosion.

For furnaces, to prevent PASCC, keep the firebox heated above the dewpoint to keep ________ from forming.

Formation of a metallurgical phase known as sigma phase results in a loss of _________ in some stainless steels as a result of high temperature exposure.

Which material below is not susceptible to caustic corrosion?

Creep damage is found in high temperature equipment operating above the ________. Fired heater tubes and components, Catalytic reactors, FCC reactors and FCC fractionator and regenerator internals all operate in or near this.

All piping and equipment exposed to HF acid at any concentration with hardness levels above ________ are subject to hydrogen stress cracking.

With chloride stress corrosion cracking, __________ temperatures ________ the susceptibility for cracking.

SSC is a form of ________ stress corrosion cracking.

Equipment that is temper embrittled may be susceptible to _______ during start-up and shutdown.

Which of the following materials is susceptible to sigma phase embrittlement?

Blistering, HIC, SOHIC and SSC damage can occur wherever there is a ____________ environment.

Creep and stress rupture is more likely in a _________ grained material than a _______ grained material.

Cavitation is best prevented by avoiding conditions that allow the absolute pressure to fall below the ___________ of the liquid or by changing the material properties.

Corrosion of the anode may be significantly higher ________ to the connection to the cathode, depending on solution conductivity.

To prevent hydrogen embrittlement, use lower strength steels and _________ to temper the microstructure, improve ductility and reduce residual stresses.

The endurance limit is usually about:

Thermal fatigue becomes of concern if the temperature swings exceed: