Q1: How does HIC testing apply to API 5L X65 Sour Service?
A: NACE TM0284 evaluates resistance to Hydrogen-Induced Cracking in wet H₂S environments.
Q2: Why is Inconel 625 cladded onto carbon steel pipes for deepwater risers?
A: To combine carbon steel's strength with alloy 625's corrosion fatigue resistance.
Q3: What causes "green rot" in 310S tubes and how is it prevented?
A: Carburization at 1500-1800°F; prevented by using low-carbon variants or Al/Si coatings.
Q4: How does chloride concentration affect 6Mo super austenitic (UNS S31254) tubing?
A: It resists pitting up to 100,000 ppm Cl⁻, unlike 316L which fails above 2,000 ppm.
Q5: Why is galvanizing not recommended for 4130 alloy tubes?
A: Risk of liquid metal embrittlement during hot-dip process; phosphating is preferred.
