US 9,808,844 B2
Method for producing a steel tube including cleaning of the outer tube wall
Thomas Frobose, Versmold (DE); and Udo Rauffmann, Werther (DE)
Assigned to Sandvik Materials Technology Deutschland GMBH, Düsseldorf (DE)
Appl. No. 14/778,123
Filed by SANDVIK MATERIALS TECHNOLOGY DEUTSCHLAND GMBH, Dusseldorf (DE)
PCT Filed Mar. 11, 2014, PCT No. PCT/EP2014/054729
§ 371(c)(1), (2) Date Sep. 18, 2015,
PCT Pub. No. WO2014/146935, PCT Pub. Date Sep. 25, 2014.
Claims priority of application No. 10 2013 102 703 (DE), filed on Mar. 18, 2013.
Prior Publication US 2016/0279688 A1, Sep. 29, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. B21B 45/02 (2006.01); B08B 7/00 (2006.01); B21B 21/00 (2006.01); B21B 38/00 (2006.01)
CPC B21B 45/0284 (2013.01) [B08B 7/0021 (2013.01); B08B 7/0092 (2013.01); B21B 21/00 (2013.01); B21B 38/006 (2013.01); B08B 2209/02 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for producing a steel tube comprising:
manufacturing the steel tube by forming a hollow shell into a form of a finished dimensioned steel tube by cold pilgering, the steel tube having an inner tube wall, an outer tube wall, and a free tube cross-section enclosed by the inner tube wall, wherein after the manufacturing, the steel tube on the outer tube wall includes at least one contaminant, the at least one contaminant being a lubricant transferred from a roll to the outer tube wall; and
cleaning the outer tube wall of the steel tube by applying liquid or solid CO2 onto the outer tube wall in order to remove the lubricant from the outer tube wall,
wherein, during the application of the liquid or solid CO2 onto the outer tube wall, the temperature of the steel tube is measured and the cleaning is interrupted if the temperature of the steel tube falls below a predetermined temperature threshold.