1. Q: What is a seamless steel pipe?
A: A seamless steel pipe is a tubular product without any welded seam, manufactured by piercing a solid billet to form a hollow shell and then elongating it through various processes like hot rolling, cold drawing, or pilgering.
2. Q: What is the key advantage of seamless pipes over welded pipes?
A: The primary advantage is superior strength and reliability under high pressure, critical temperatures, and harsh environments, as the absence of a weld seam eliminates a potential point of failure.
3. Q: Name a common ASTM standard for seamless carbon steel pipes for high-temperature service.
A: ASTM A106 covers seamless carbon steel pipe for high-temperature service (e.g., in power plants and refineries).
4. Q: What does the grade "A106 Gr. B" signify?
A: It signifies a specific grade within the ASTM A106 standard. Gr. B pipes have a minimum yield strength of 35,000 psi (240 MPa) and are the most commonly used grade for general high-temperature service.
5. Q: Which standard covers seamless pipes for refinery and chemical service?
A: ASTM A335 covers seamless ferritic alloy-steel pipe for high-temperature service, commonly used in refineries and chemical plants (e.g., Grades P5, P9, P11, P22, P91).
