Fe-cr alloy billet and method for production thereof

Details Fe-cr alloy billet and method for production thereof Fe-cr alloy billet and method for production thereof

B - Operations, Transporting

21

B

B21B 1/02 (2006.01) B21B 45/00 (2006.01) C22C 38/00 (2006.01) C22C 38/18 (2006.01)

Patent

CA 2525147

Fe-Cr alloy billet manufacturing method according to the present invention, since the blooming is carried out with the high reduction rate surface of the cast steel covered with a scale layer of a large area rate as 70 % or more and without the descaling applied, can reduce the indentation and inclusion of the scale. Thereby, in the case of a billet for use in seamless steel pipes being manufactured from a steel strip of a Fe-Cr alloy, surface treatment before tube-making can be largely reduced. Thereby, when the Fe-Cr alloy billet is adopted in manufacturing seamless steel pipes, since even the Fe-Cr alloy steel pipe relatively hard to process can be manufactured at low manufacturing cost and efficiently, it can be widely applied in a field of manufacturing hot seamless steel pipes.

Billette en alliage Fe-Cr caractérisée en ce qu'un pourcentage de surface élevé, atteignant 70 % ou plus de la surface supérieure d'étirage, est couvert d'une couche de calamine et procédé de production d'une billette en alliage Fe-Cr selon lequel un lingot est soumis au dégrossissage sans décalaminage du lingot. Ladite billette en alliage Fe-Cr permet la réduction de la poussée ou de la pénétration de la calamine dans la billette et permet une réduction significative du traitement de surface avant la fabrication d'un tube, pour la production d'une billette pour un tube sans soudure. L'utilisation d'une billette en alliage Fe-Cr pour la production d'un tube sans soudure permet la production d'un tube en acier d'alliage Fe-Cr relativement difficile à fabriquer, à coût réduit et avec un bon rendement, ce qui conduit à l'utilisation à grande échelle de ladite billette dans le domaine de la production à chaud de tubes en acier sans soudure.

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