1. Can ERW pipe be used for high-pressure service?
Yes, if it meets standards like API 5L, GB/T 9711 with proper grade, wall thickness, and NDT.
2. What is the effect of carbon content on weldability?
Higher carbon increases strength but reduces weldability and raises cracking risk. Low carbon is better for welding.
3. What is the difference between Q235B and Q355B?
Q235B has yield strength ≥235MPa;Q355B has yield strength ≥355MPa, higher strength for structural use.
4. What is pipe threading used for?
Threading is for screwed connections in plumbing, fire fighting, gas lines, and small-diameter piping.
5. What is casing pipe?
Casing pipe is large-diameter pipe used in well drilling to support the well wall and prevent collapse.
