1. What are the main chemical composition characteristics of 10# seamless steel pipe? Answer: The main chemical composition of 10# seamless steel pipe is controlled as follows: C (0.07%-0.14%), Si (0.17%-0.37%), Mn (0.35%-0.65%), P≤0.035%, S≤0.035%. It is a low-carbon steel with low carbon content, good plasticity and toughness, and easy processing and forming, which is suitable for low-pressure fluid transportation and general structural parts.
2. What is the difference between 20# seamless steel pipe and 10# seamless steel pipe in terms of mechanical properties? Answer: Compared with 10# seamless steel pipe, 20# seamless steel pipe has higher carbon content, so its mechanical properties are slightly better: the tensile strength of 20# is 410-550MPa, the yield strength is ≥245MPa, and the elongation is ≥25%; while the tensile strength of 10# is 335-475MPa, the yield strength is ≥195MPa, and the elongation is ≥31%. 20# is more suitable for medium-pressure fluid transportation and mechanical parts with higher strength requirements.
3. Can 35# seamless steel pipe be used for making mechanical shafts? Answer: Yes. 35# seamless steel pipe is medium carbon steel with moderate strength (tensile strength 530-680MPa, yield strength ≥315MPa) and good toughness. After quenching and tempering heat treatment, its comprehensive mechanical properties can be further improved, which is widely used in the manufacture of mechanical shafts, connecting rods and other load-bearing parts that require a certain strength and toughness.
4. What is the maximum working temperature of 45# seamless steel pipe? Answer: The maximum long-term working temperature of 45# seamless steel pipe is not more than 450℃. When the temperature exceeds 450℃, its strength will decrease significantly, and oxidation and decarburization will easily occur, which will affect the service life. It is not suitable for high-temperature working environments such as boiler tubes.
5. Which standard does 20# seamless steel pipe for fluid transportation comply with, and what are its application scenarios? Answer: 20# seamless steel pipe for fluid transportation mainly complies with GB/T 8163 standard. It is widely used in the transportation of water, oil, gas and other neutral fluids in petroleum, chemical, municipal and other industries. It can also be used as general structural parts in machinery manufacturing, such as hydraulic cylinders and bearing sleeves.
