High-carbon steel pipe having superior cold workability and...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/00 (2006.01) B21B 17/14 (2006.01) B21C 37/06 (2006.01) B21C 37/08 (2006.01) B21C 37/16 (2006.01) B21C 37/30 (2006.01) C21D 8/10 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01)

Patent

CA 2380964

The invention provides a high-carbon steel pipe having superior cold workability and induction hardenability, and a method of producing the steel pipe. The method comprises the steps of heating or soaking a base steel pipe having a composition containing C: 0.3 to 0.8%, Si: not more than 2%, and Mn: not more than 3%, and then carrying out reducing rolling on the base steel pipe at least in the temperature range of (Ac1 transformation point - 50°C) to Ac1 transformation point with an accumulated reduction in diameter of not less than 30%. A structure in which the grain size of cementite is not greater than 1.0 µm is obtained, thus resulting in improved cold workability and induction hardenability.

L'invention concerne un tuyau en acier à haute teneur en carbone, possédant d'excellentes aptitudes au formage à froid et à la trempe à haute fréquence, et caractérisé en ce que sa composition chimique est la suivante en pourcentage massique: C: 0,3 à 0,8 %, Si: 2 % ou moins, Mn: 3 % ou moins, le solde étant constitué de Fe et d'impuretés inévitables, et en ce qu'il possède une structure dans laquelle la cémentite comporte un diamètre particulaire de l'ordre de 1,0ñm ou moins. L'invention concerne encore un procédé de fabrication de ce tuyau en acier à haute teneur en carbone, consistant à soumettre ce tuyau possédant la composition ci-dessus à un traitement de chauffage ou d'égalisation, puis à soumettre le tuyau de matériau traité à un étirage rétreinte, dans lequel le pourcentage de réduction du diamètre cumulé est de l'ordre de 30 % ou davantage. On peut employer ce procédé pour produire un tuyau d'acier à soudure électrique et haute teneur en carbone, qui possède d'excellentes aptitudes au formage à froid et à la trempe à haute fréquence.

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