Free API 571 flashcards

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Austenitic versus ferritic: what is the difference?

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Austenitic versus ferritic: what is the difference?
Austenitic steels (300 series) have a face-centered cubic structure and are nonmagnetic when annealed. Ferritic steels (carbon steel, 400 series) are body-centered cubic and magnetic.API RP 571 Section 2
What is a duplex stainless steel?
A stainless steel with a mix of austenite and ferrite.API RP 571 Section 2
What is the heat-affected zone?
Base metal next to a weld whose structure was changed by the welding heat without melting.API RP 571 Section 2
What happens when austenitic stainless steel is sensitized?
Chromium carbides form at grain boundaries, leaving them low in chromium and open to intergranular attack.API RP 571 Section 2
Intergranular versus transgranular cracking?
Intergranular cracks follow grain boundaries; transgranular cracks cut through the grains.API RP 571 Section 2
Why does the dew point matter for corrosion?
Corrosive water often forms right where a vapor first condenses, so attack can peak there.API RP 571 Section 2
In a galvanic couple, which metal corrodes?
The less noble one, the anode.API RP 571 Section 2; API RP 571 3.31
CUI?
Corrosion under insulation.API RP 571 Section 2
MIC?
Microbiologically influenced corrosion.API RP 571 Section 2
HIC and SOHIC?
Hydrogen-induced cracking, and stress-oriented hydrogen-induced cracking.API RP 571 Section 2
SCC and SSC?
Stress corrosion cracking, and sulfide stress cracking.API RP 571 Section 2
HTHA?
High-temperature hydrogen attack.API RP 571 Section 2