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A study has been made of the use of coatings applied to the interior of continuous casting billet moulds, with the objective of improving billet surface quality, particularly for oil lubricated casts, and extending mould service life. The range of coatings available was restricted by the need to avoid softening of the copper, precluding the use of a number of oxide and carbide deposition techniques. The constraint on internal accessibility imposed by the mould geometry further restricted the choice of possible coatings. Coated 140 mm section moulds have been used in commercial trials to produce a range of carbon and low alloy steel billets. The mould coatings comprised Cr plating, Cr plating overlaid with TiN and CrTiN, and primary electroless Ni overlaid with ZrN and a series of proprietary low temperature deposits, including Ni/PTFE. Comparisons have been made of the quality of billet surfaces produced with each coating and mould service performance has also been assessed in each case. Only the nitrides on Cr plating and Ni/PTFE coatings on electroless Ni showed satisfactory resistance to damage in service, with the Ni/PTFE providing some evidence of advantages to both mould condition and billet surface quality.

Additional information

Authors: FARIES F, Davy McKee (Poole) Ltd (GB);RAWSON J, Davy McKee (Poole) Ltd (GB);ROSE A, Davy McKee (Poole) Ltd (GB);BUGDOL M, Davy McKee (Poole) Ltd (GB)
Bibliographic Reference: EUR 15749 EN (1996) 60pp., FS, ECU 8.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6554-7
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