| 摘要 |
Disclosed is a seamless steel pipe for a high-strength hollow spring, which comprises 0.20 to 0.70 mass% of C, 0.5 to 3.0 mass% of Si, 0.1 to 3.0 mass% of Mn, 0.030 mass% or less (including 0%) of P, 0.030 mass% or less (including 0%) of S, 0.02 mass% or less (including 0%) of N, and the remainder made up by Fe and unavoidable impurities, and which is characterized in that carbide has an equivalent circle diameter of 1.00 µm or less. The seamless steel pipe enables the production of a hollow spring having high strength and excellent durability. |
