1. What is the maximum wall thickness of A106 Grade B seamless carbon steel pipe?
Answer: According to ASTM A106 standard, the maximum wall thickness of A106 Grade B seamless carbon steel pipe can reach 100 mm, which can be customized according to engineering needs, but the thicker the wall, the higher the requirements for processing technology.
2. What is the corrosion resistance of Q235B carbon steel pipe?
Answer: Q235B is a plain carbon steel with poor natural corrosion resistance. It is easy to rust in humid air, water or corrosive media. It needs anti-corrosion treatment (such as galvanizing, painting, anti-corrosion coating) when used in harsh environments.
3. What grade of carbon steel pipe is used for fire-fighting pipelines?
Answer: The commonly used grade is Q235B or A53 Grade B. Fire-fighting pipelines require good pressure-bearing capacity and corrosion resistance (after anti-corrosion treatment), and these two grades have good cost performance and meet the fire-fighting standard requirements.
4. What is the impact test requirement for API 5L Grade B carbon steel pipe?
Answer: API 5L Grade B carbon steel pipe requires impact test at 0°C, and the minimum impact energy is 27 J (for pipes with diameter ≥ 114.3 mm). The impact test ensures that the pipe has good toughness and avoids brittle fracture in low-temperature environment.
5. What is the chemical composition of A333 Grade 6 carbon steel pipe?
Answer: A333 Grade 6 is a low-temperature carbon steel pipe complying with ASTM A333 standard. Its main chemical composition is C ≤ 0.30%, Mn = 0.29-1.06%, P ≤ 0.035%, S ≤ 0.035%, Si ≤ 0.10%, and it has good low-temperature toughness, suitable for low-temperature fluid transportation.
