Copper Moulds

 


1.Copper mould tube( square ,rectangle and round )
2.Crystallizing equipment of continuous casters
3.Mould cooling jacket.
4.repair of copper tube moulds

COPPER MOULD ALLOYS

The copper alloys chosen for the moulds must maintain their physical properties at the operating temperatures of the continuous casting process.
The temperature gradation from the inner wall of the mould to the outside face of the mould can cause serious distortion problems ,and it is imperative that the correct alloy is chosen for the various operating conditions.

STANDARD MATERIALS


Phosphorus de-oxidised copper

    This alloy has been proven to be excellent for the manufacture of moulds in the continuous casting of billets .The main composition of this alloy are Cu + Ag 99.90min,P0.0015/0.040.

Copper -Silver alloy
    The addition of a small amount of silver ,whilst not increasing the melting point of copper ,does increase the recrystallisation temperature by almost 100,and also helps to give better thermal conductivity at the operating temperatures.
This alloy is normally used in moulds for the continuous casting of blooms and slabs .In this case ,the moulds are much thicker than in the billet moulds ,and the moulds temperature can be higher.The main composition of this alloy are Cu+Ag99.90 min. Ag 0.08/0.12 O 0.004/0.012
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COPPER MOULD TUBE  

    The continuous casting of molten steel into billets ,blooms and slab products ,has been highly refined over the years into an extremely sophisticated system .The continuous casting process is expected to produce metallurgically sound products at the lower possible cost ,and this is being achieved in many steelworks throughout the world.
    Copper moulds have played an important role in the development of the continuous casting process .Their funcition is to receive the molten steel and to allow rapid heat transfer from the steel to the cooling water to enable quick solidification.
    The mould must exhibit excellent thermal conductivity ,be resistant for thermal erosion ,and be resistant to distortion from thermal stress .So far only copper and a few copper alloys meet the above conditions ,both economically and technically.

SOLIDIFICATION

    The rate of solidification in the continuous casting process dictates the speed of production .The molten steel ,which is in contact with the inner faces of the copper mould ,starts to sllidify as rapidly as the heat is extracted ,forming a shell .The shell increases in thickness as more heat is extracted ,and eventually total solidfication is achieved .the process is similar to the solidification of ingots in ingot moulds .In continuous casting ,the whole process is speeded up ,with the aim to produce and homogeneous shell growth.
    Consequently ,the mould is an important part of the continuous casting process ,and the manufactured quality of the mould plays and important role in their length of life.

INNER SURFACE COATINGS

    Over the years ,Metallurgists and Engineers have been working together to develop better continuous casting moulds .The steel companies require a more economical mould which will give a longer service life .Surface coating of the inner walls of the mould has given the best results to date .Coatings available are Chromium and Nickel plating .Also,a combination of the two give good results on slab casting.

SPECIFICATIONS OF COPPER MOULD

size
   90x90       100x100   110x110   115x115   120x120   130x130 
   135x135   140x140   150x150   160x160   200x200   150x180
   150x220   130x240   160x200   180x220   220x220   240x240 
radius
   4000  5000  5250  5560  6000  7000  7500  8000  9000  10250 120000
length
   700  750  780  800  810  812  850  900
                                                   unlt:mm