1. Q: What welding processes are recommended for these grades?
A: Pre-heating and low-hydrogen welding processes (e.g., SMAW with basic electrodes, GTAW, GMAW) are recommended. Post-weld heat treatment (PWHT) is often necessary for high-stress applications.
2. Q: What are the common heat treatment processes?
A: The standard treatment is quenching and tempering (Q&T) to achieve the optimal combination of strength and toughness. Normalizing may also be applied.
3. Q: How does 20MnV6 perform in low-temperature applications?
A: With proper heat treatment, it offers good low-temperature impact toughness, making it suitable for components operating at moderately low temperatures (not cryogenic).
4. Q: What are the key machining considerations for these pipes?
A: In the heat-treated condition, they have high strength, requiring robust machining setups, appropriate cutting tools (hard grades), and adequate cooling.
5. Q: Can these pipes be cold-drawn or cold-worked?
A: Yes, they can be cold-drawn to achieve precise dimensions, better surface finish, and increased strength via work hardening. Annealing may be required after severe cold working.
