Process for manufacturing seamless metal tubes

Details Process for manufacturing seamless metal tubes Process for manufacturing seamless metal tubes

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Patent

CA 1159686

ABSTRACT OF THE DISCLOSURE The present invention relates to the manufacture of seamless metal tubes by a cross- roll helical rolling process such as Mannesmann mandrel mill process or by a press piercing process such as Ugine Sejournet process. Shells being worked are subjected to outside-diameter reduction by means of a rotary mill having 3 or 4 rolls, without using internal sizing tools such as plug and mandrel bar, so that wall eccentricity is significantly improoved, which fact assured higher quality of finished product. The process of the invention permits decreasing the number of sizes or billets as materials for tube making. -39-

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