A seamless steel tube according to the present embodiment is used for a line pipe used in an acidic environment.
The cooled seamless steel pipe is quenched (S6).
The quenched seamless steel pipe is tempered (S7).
The seamless steel pipe is cooled with water, and water cooling is halted when the temperature of the seamless steel pipe reaches 450°C or lower (S5).
The blank tube is rolled and the diameter thereof is fixed, thereby producing a seamless steel pipe (S3).
The seamless steel pipe enables the production of a hollow spring having high strength and excellent durability.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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