The virgin blank is used for the production of round billets, rectangular billets and slabs with a side length of 120-450 mm.
(1) Use for the production of square billets, rectangular billets and slabs with a side length of 120 to 450 mm for the production of the initial mill. (2) Dimensional specifications are shown in Table 2-112 and Table 2-113. Table 2_112 Billet size and allowable deviation Billet side length / mm fillet radius / mm side length allowable deviation / mm diagonal length difference / mm
12020?6
130
140
15020?7
16020
17025
18025
19030?9
20030
21030
22035
24035?lO
250
26040?ll
28040
30045
32050?014
35050
40060
45060
Note: 1. The fillet radius is only for the hole design. 2. The thickness and width of the rectangular blank are the same as the billet. The radius of the fillet, the difference in the diagonal length and the allowable deviation of the thickness and width shall be the corresponding values ​​specified by the billet of the side of the relatively rectangular width. For the billet and rectangular billet rolled out of the non-finished hole, the difference in the length dimension and the diagonal length of the billet are specified by the agreement between the supplier and the buyer. Table 2-113 Dimensions and tolerances of slabs
Name size / mm tolerance / mm
Thickness 100~150?
>150~300?
Width 450～1600?5-10
Note: 1. The initial rolling stock can be delivered in the normal length or fixed length and multiple length. The specific length is agreed by the supplier and the buyer. If delivered in a fixed length or multiple length, the length tolerance is 80mm. 2. The bending degree per meter of the blank shall not exceed 20mm, and the total bending shall not exceed 2.O% of the total length. 3. The slab bending of the slab shall not exceed 10 mm per meter, and the flatness shall not exceed 20 mm per meter. 4. The blank is to be cut and delivered. The shear slope of the slab end shall not exceed 25 mm, and the local broadening of the end due to shear deformation shall not be greater than 10% of the side length. The blanks must not be significantly reversed. The width of the billet or rectangular billet at the maximum concave or maximum bulge shall not exceed its allowable deviation.
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