HIGH-CARBON STEEL PIPE HAVING SUPERIOR COLD WORKABILITY AND INDUCTION HARDENABILITY, AND MENTOD OF PRODUCING THE SAME

摘要

A high carbon steel pipe excellent in cold formability and high frequency hardenability, characterized in that it has a chemical composition, in mass %: C: 0.3 to 0.8 %, Si: 2 % or less, Mn: 3 % or less, and balance: Fe and inevitable impurities, and a structure wherein cementite has a particle diameter of 1.0 m or less; and a method for producing the high carbon steel pipe which comprises subjecting a material steel pipe having the above composition to a heating or soaking treatment and then subjecting the treate d material tube to a stretch reducing wherein a cumulative diameter reduction percentage is 30 % or more. The method can be employed for producing a high carbon electric welded steel pipe excellent in cold formability and high frequency hardenability.