API-571

API-571 practice questions, page 13 of 18, with answer review and explanations.

Question 61

Ferritic stainless steels are usually not used in __________ applications.

  1. Non-pressure boundary
  2. Pressure boundary
  3. High temperature
  4. Low temperature

Question 62

Stress ruptures are characterized by _________ failures and are usually accompanied by thinning at the fracture surface.

  1. Rapid
  2. Fish-mouth
  3. Tensile
  4. None of the above

Question 63

With hydrofluoric acid corrosion, corrosion rates increase with _______ temperatures and ______ HF concentrations.

  1. Increasing, decreasing
  2. Decreasing, increasing
  3. Increasing, increasing
  4. Decreasing, decreasing

Question 64

Which of the following materials is susceptible to CO² corrosion?

  1. Carbon steel
  2. Stainless steel
  3. Duplex stainless steel
  4. Both B and C

Question 65

Steel hardness, __________ and stress are critical factors in causing hydrogen stress cracking.

  1. Temperature
  2. Alloy composition
  3. Strength
  4. None of the above