Q: How does the carbon content affect the performance of seamless steel pipes (taking 10# and 45# as examples)?
A: 10# steel (low carbon) has low carbon content, good plasticity, toughness and weldability, but low strength; 45# steel (medium carbon) has higher carbon content, higher strength and hardness, but worse plasticity and weldability than 10# steel. 45# seamless pipes are often used for mechanical parts that require high strength.
Q: What is the impact toughness requirement of ASTM A335 P22 seamless steel pipes?
A: At room temperature (20℃), the minimum impact toughness (KV) of ASTM A335 P22 seamless steel pipes is 27 J. For low-temperature service, the impact toughness requirement will be higher (e.g., 40 J at -20℃).
Q: Do API 5L X65 seamless steel pipes have corrosion resistance?
A: API 5L X65 itself has basic corrosion resistance, but it is not suitable for strong corrosive environments (such as acid-base media). For corrosive working conditions, it needs to be treated with anti-corrosion coatings (such as 3PE anti-corrosion layer) or selected with corrosion-resistant alloy grades.
Q: What is the elongation requirement of GB/T 8163 20# seamless steel pipes?
A: The minimum elongation of GB/T 8163 20# seamless steel pipes is 24%, which reflects the plastic deformation capacity of the pipe when it is pulled to break.
Q: Which grade of seamless steel pipe is suitable for high-pressure boiler water supply pipelines?
A: ASTM A335 P91 or GB/T 5310 12Cr1MoVG seamless steel pipes are suitable. They have excellent high-temperature resistance, pressure resistance and creep resistance, which can adapt to the high-temperature and high-pressure environment of boiler water supply.
