Method and cooling system for improving comprehensive mechanical property of normalized steel plate
A technology of comprehensive mechanics and cooling system, which is applied in the field of improving the comprehensive mechanical properties of normalized steel plates, methods and cooling systems, can solve the problem of not considering the influence of heating on the performance of steel plates, easy bonding of oxide scales on the surface of steel plates, and poor cooling of steel plates. Uniformity and other issues, to achieve the effect of improving comprehensive mechanical properties, increasing yield strength, and stabilizing pressure
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[0039] Example 1
[0040] Taking steel grade Q370qE as an example, the method to improve the comprehensive mechanical properties of normalized steel plates is detailed. The specifications of steel grade Q370qE: thickness 60mm×width 2500mm×length 12000mm.
[0041] The first step: use empirical formula to calculate the Ac3 temperature point of steel plate, Andrews formula:
[0042] Ac3=910-203C 1 / 2 -15.2Ni+44.7Si+104V+31.5Mo+13.1W,
[0043] Applicable to C≤0.6wt%, Mn≤4.9wt%, Cr≤5wt%, Ni≤5wt%, Mo≤5.4wt%, (wt% mass percentage), according to the calculated value of Ac3 to determine the steel grade Q370qE heating The target temperature is 880±10°C.
[0044] Step 2: Calculate the heating time required for the steel plate thickness to reach the target temperature for normalizing heating. The formula is 1.3~1.6min / mm×steel thickness. This heating time is the operating time of the heating zone;
[0045] Considering the above heating target temperature and the heating power of the normalizing furn...
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[0062] Example 2
[0063] Such as Figure 1~6 As shown, a cooling system for improving the comprehensive mechanical properties of normalized steel plates includes a roller table 1. A water mist cooling device 2 is arranged on the upper and lower sides of the roller table 1, and the sides of the roller table 1 before and after the water mist cooling device 2 are provided The compressed air blowing device 3 on the inner side of the roller table 1 and the water mist cooling device 2 include multiple sets of nozzles 4 arranged above and below the roller table 1. Each group of nozzles 4 is arranged along the axis of the roller table 1, and From the edge of track 1 to the center of roller track 1, the distance between nozzles 4 decreases. The steel plate 7 running on the roller table 1 is the steel plate to be cooled that has been normalized in the normalizing furnace.
[0064] Such as Figure 4 The nozzle 4 used in this embodiment is a full cone water mist nozzle with a spray angle of...
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