Control method for reducing tail shrinkage hole of square billet
A technology of compression control and shrinkage cavity, which is applied in the field of slab continuous casting process control, can solve the problem of large shrinkage cavity at the tail of the billet, and achieve the goal of reducing the shrinkage cavity at the tail of the billet, reducing the amount of shrinkage cavity, and shortening the length of the shrinkage cavity Effect
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example 1
[0068] Steel type: 20CrMoH, [C] content between 0.17 and 0.2; superheat: 30°C; casting speed: 0.65m / min; surface); secondary cooling mode: CC02K30; the casting process adopts the conventional tension and straightening pressure control mode, and the pressure is ≤15t;
[0069] 1) Obtain the solid phase ratio of the slab under each tension leveling machine through the model computer:
[0070]
1#
2#
3#
4#
5#
6#
7#
8#
9#
Solid fraction fs
0.09
0.21
0.34
0.45
0.59
0.76
0.96
1
1
[0071] 2) According to the range of solid phase ratio required for the set compression point (fs=0.2~0.7), determine the tail blank compression point as 2#, 3#, 4#, 5# tension leveler;
[0072] 3) According to the scope and practical experience, set the compression amount as:
[0073]
1#
2#
3#
4#
5#
6#
7#
8#
9#
Compression mm
0
2
3
3
2
...
example 2
[0078] Steel type: SAE5120M, [C] content between 0.18 and 0.22; superheat: 25°C; casting speed: 0.65m / min; surface); secondary cooling mode: CC04K26; the casting process adopts the conventional tension straightening pressure control mode, and the pressure is ≤15t;
[0079] 1) Obtain the solid phase ratio of the slab under each tension leveling machine through the model computer:
[0080]
1#
2#
3#
4#
5#
6#
7#
8#
9#
Solid fraction fs
0.14
0.29
0.47
0.61
0.83
1
1
1
1
[0081] 2) According to the range of solid phase ratio required for the set compression point (fs=0.2~0.7), determine the tail blank compression point as 2#, 3#, 4# tension leveler;
[0082] 3) According to the scope and practical experience, set the compression amount as:
[0083]
1#
2#
3#
4#
5#
6#
7#
8#
9#
Shrinkage mm
0
2
3
2
0
0
0
...
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