1. Q: What is the most common specification for general-purpose carbon steel welded pipe?
A: ASTM A53 Grade B (ERW or continuous welded) is the most common specification for general service, conveying water, gas, air, and steam.
2. Q: What is the key difference between ASTM A53 Grade A and Grade B?
A: The primary difference is minimum yield strength: Grade A is 30 ksi (205 MPa), while Grade B is 35 ksi (240 MPa). Grade B also has slightly higher carbon content.
3. Q: Which grade of ASTM A106 is suitable for high-temperature service?
A: All grades (A, B, C) of ASTM A106 seamless pipe are for high-temperature service, but Grade C has the highest tensile strength (70 ksi min) and carbon content (0.35% max).
4. Q: Can ASTM A500 structural pipe be welded?
A: Yes, ASTM A500 (Grades A, B, C) structural tubing can be welded, but welding procedures must account for its cold-formed properties and potential for strength loss in the heat-affected zone (HAZ).
5. Q: What is the main use of API 5L Line Pipe?
A: API 5L pipe is for transporting oil, gas, and slurry in pipeline systems. Common grades include PSL1 (e.g., Gr. B, X42) and higher-strength PSL2 (e.g., X52, X60, X70).
