1.Why is 45# carbon steel seamless pipe not suitable for welding?
Answer: 45# carbon steel has high carbon content. During welding, the heat-affected zone is prone to hardening and cracking, and the weld toughness is reduced. If welding is required, preheating (150-250℃) and post-weld heat treatment are needed, which increases the process complexity.
2. What is the application scope of 10# carbon steel seamless pipe?
Answer: It is mainly used in low-pressure fluid transportation (such as water, gas, oil), and also used in the manufacture of mechanical parts with low strength requirements, such as brackets, sleeves, etc.
3. What occasions are 16Mn carbon steel seamless pipes suitable for?
Answer: 16Mn has high strength and good toughness, and is suitable for medium and high pressure fluid transportation (such as oil and gas pipelines), mechanical structural parts, and engineering projects (such as bridges, buildings) that require high load-bearing capacity.
4. What is the maximum working pressure of 20# carbon steel seamless pipe?
Answer: It depends on the wall thickness and working temperature. Under normal temperature (20℃), the maximum working pressure of 20# seamless pipe with Φ57×3.5mm is about 10MPa; the thicker the wall thickness, the higher the bearing pressure.
5. What is the impact toughness of 16Mn carbon steel seamless pipe?
Answer: The impact toughness (Akv) of 16Mn seamless pipe is ≥34J (at 20℃), which is much higher than that of ordinary carbon steel, so it has good resistance to impact and vibration.
