API-571 試験問題を無料オンラインアクセス

The 300 series stainless steels (austenitic stainless steels) are generally resistant to oxidation up to what temperature?

• A.1300°F (704°C)
• B.1400°F (760°C)
• C.1500°F (815°C)
• D.1600°F (871°C)

Which of the following statements about high-temperature hydrogen attack is most accurate?

• A.Acoustic emission testing is not a proven method for the detection of high-temperature hydrogen attack damage.
• B.300 series stainless steels are also susceptible to high-temperature hydrogen attack at conditions normally seen in refinery units.
• C.High-temperature hydrogen attack will most often be associated with the formation of surface blisters.
• D.High-temperature hydrogen attack damage is most often limited to welds and heat-affected zones.

Spheroidization is a change in the microstructure of steels that can occur after exposure to a minimum temperature of:

• A.1000°F (540°C)
• B.850°F (455°C)
• C.700°F (370°C)
• D.650°F (345°C)

Nitriding of steels becomes most severe at temperatures above:

• A.600°F (315°C)
• B.200°F (95°C)
• C.500°F (260°C)
• D.900°F (480°C)

Besides corrosion, what other damage mechanism in hydrofluoric (HF) acid service should inspectors be alert to?

• A.Stress corrosion cracking
• B.Wet HF cracking
• C.Hydrogen stress cracking
• D.Fluoride stress cracking