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Free API-571 Exam Braindumps (page: 44)

Page 43 of 114
PDF with 454 Questions

Stainless steels with sigma can normally withstand normal operating stresses but upon cooling to temperatures below _______ may show a complete lack of fracture toughness as measured by a Charpy impact test.

  1. 800º F
  2. 600º F
  3. 500º F
  4. 400º F

Answer(s): C



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 __________.

  1. 700º F
  2. 750º F
  3. 800º F
  4. 900º F

Answer(s): B



Increasing the chromium in steels offers no major improvement in resistance to CO² corrosion until a minimum of __________ is reached.

  1. 9%
  2. 12%
  3. 5%
  4. 7%

Answer(s): B



_________ significantly increases the probability and severity of blistering, HIC and SOHIC.

  1. Hydrogen
  2. Oxygen
  3. Cyanide
  4. Caustic

Answer(s): C






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