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Steel Mill Roll Degradation |
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Higher Wear Rates For Thin Slab Caster Rolls
Thin Slab Caster Rolls have been shown to wear by an average of 0.22mm/MT. This is higher with conventional casters worldwide where wear rates as low as 0.05mm/Mt have been reported. The increased rate of roll rotation translates |
| | into a higher frequency of thermal and mechanical loading during service than experienced in a conventional caster. Therefore, service within a thin slab caster is more serve than in a conventional slab caster. |
| | | | | | Comparison between Conventional and Thin Slab Casters |
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|
Parameter |
Conventional |
Thin Slab |
|
Length of 1M tonne slab, m |
485,290 |
1,358,811 |
|
Roll Diameter, mm |
230 |
165-185 |
|
Slab Width, mm |
1250 |
1250 |
|
Slab thickness, mm |
210 |
75 |
|
Casting Speed, m/mm |
1 |
4.5 |
|
N Roll Revolutions / minute |
1.38 |
7.7 (185mm Ø)
8.6 (165mm Ø) |
|
No Roll Revolutions million tonnes |
671,349 |
2620,297
(165mm Ø)
2,337,021
(185mm Ø) | |
| | | | | Equivalent performance on conventional caster. |
| |
|
Tonnage |
|
For equivalent cast length, m. |
For equivalent No roll revolutions |
|
1,904,000 |
2,654,060 | |
| | | | Uneven Wear Patterns with Thin Slab Casters |
| | | | | | Roll wear and cracking in Thin Slab Casters is non-uniform. The degree of cracking and wear generally increases from the unloaded edge of the rolls towards the “hot end” of the rolls supporting the slab centre. Inspection and reclamation of spit rolls within a thin slab caster must take into account this non-uniform wear and depth of cracking |
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