1. Q: What is the role of Carbon Equivalent (C.E.)?
A: C.E. formula (like IIW) predicts the weldability and hardenability of steel. A lower C.E. indicates better weldability, critical for pipes requiring field welding.
2. Q: What is "HIC Test"?
A: Hydrogen Induced Cracking Test assesses resistance to cracking in wet H2S environments. It's a key test for pipes used in sour service (e.g., NACE applications).
3. Q: What is ASTM A335? Is it seamless?
A: ASTM A335 covers seamless ferritic alloy-steel pipe for high-temperature service (e.g., P5, P9, P11, P22, P91). It's used in power generation and process heaters.
4. Q: Can you supply cold drawn seamless tubes (CDS)?
A: Yes, to standards like ASTM A179 (heat exchanger tubes) and ASTM A519. They offer excellent surface finish, precise dimensions, and enhanced mechanical properties.
5. Q: What is "Drill Pipe" in oil industry?
A: A specialized grade of seamless pipe (API 5DP) used in drill strings to transmit power and drilling fluid. It undergoes severe torsion, tension, and internal pressure.
