Free API-571 Exam Braindumps
Corrosion and Materials Professional Questions 91–95 (page: 20)

Updated On: 9-Feb-2026

Cracking can occur at low caustic levels if a concentrating mechanism is present. In such cases, caustic concentrations of ________ ppm are sufficient to cause cracking.

  1. 50-100
  2. 100-150
  3. 150-200
  4. 200-250

Answer(s): A



Which of these materials is susceptible to 885º F embrittlement?

  1. 400 Series SS
  2. Duplex SS
  3. 5Cr-1Mo
  4. Both A and B

Answer(s): D



Spheroidization and graphitization are competing mechanisms that occur at overlapping temperature ranges. Spheroidization tends to occur preferentially above _______ while graphitization predominates below this temperature.

  1. 1000º F
  2. 1025º F
  3. 1050º F
  4. 1100º F

Answer(s): B



Sulfidation is primarily caused by ________ and other reactive sulfur species as a result of the thermal decomposition of sulfur compounds at high temperatures.

  1. Sulfur dioxide
  2. H²S
  3. Sulfur trioxide
  4. Sulfates

Answer(s): B



Damage from sigma phase appears in the form of ________.

  1. Corrosion
  2. Hardness
  3. Cracking
  4. Ductility

Answer(s): C



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