1. Q: What is a common grade under JIS G3454?
A: JIS G3454 STPT370, STPT410, STPT480, where the number indicates the minimum tensile strength in MPa.
2. Q: What is the Chinese standard equivalent to ASTM A106?
A: GB/T 8163 is for fluid transport, but GB 9948 (seamless for high temp) or GB 6479 (for chemical fertilizer equipment) are closer in some aspects. GB/T 5310 is for high-pressure boiler tubes. The common carbon grade is 20# steel.
3. Q: What does "20# steel" mean in Chinese standards?
A: It indicates a carbon steel with a nominal carbon content of about 0.20%. It is widely used for seamless pipes.
4. Q: What is "NPS" and how does it relate to pipe grades?
A: NPS stands for Nominal Pipe Size. It's a dimensionless designator for pipe diameter. Grades define the material, while NPS defines the size. A grade like A106 B can be manufactured in various NPS sizes.
5. Q: What does "Schedule" refer to in piping?
A: Schedule (e.g., Sch 40, Sch 80, Sch 160) indicates the wall thickness of the pipe for a given NPS. Higher schedule numbers mean thicker walls.
