Cooling method of H-shaped steel
A cooling method, H-shaped steel technology, applied in the direction of furnace type, heat treatment process control, furnace, etc., can solve the problems of temperature difference and uneven temperature distribution of the section
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[0061] During the preparation process of the H-shaped steel, the heating furnace gas temperature is 1100-1250°C, the holding time is 80-100min, which can effectively control the growth of austenite grains, and the rolling start temperature is 1100-1180°C.
[0062] Exemplarily, the cooling method of the above-mentioned H-shaped steel can be implemented by using a cooling device, see Figure 1 to Figure 6 , including a platform 1 and a nozzle assembly 2 arranged in at least one direction (for example, above, below, left and / or right) of the platform 1, the nozzle assembly 2 includes alternately arranged water mist nozzle groups and air-cooled nozzles Group, water mist nozzle group and air-cooled nozzle group are multiple.
[0063] For the arrangement of water mist nozzle groups and air-cooled nozzle groups, 1 to 100 nozzle groups can be arranged in each direction of the platform 1, and water mist nozzle groups and air-cooled nozzle groups are arranged alternately. Each nozzle gr...
Embodiment 1
[0076] Taking the light H-shaped steel with steel grade Q345B as an example, the size is 750mm×450mm×120mm, by weight percentage (wt%), it includes the following components: C: 0.08, Si: 0.65, Mn: 1.30, V: 0.05, Cr : 0.04, the rest is Fe, control impurity content: P≤0.045%, S≤0.045%. The heating furnace gas temperature is 1200°C, the holding time is 85min, and the rolling start temperature is 1150°C.
[0077] The post-rolling cooling path adopts the alternate arrangement mode of water mist cooling and air cooling units. In each cycle, the cooling path length of the water mist cooling unit is 6m, and the cooling path length of the air cooling unit is 4m. A total of 3 cycles and 6 groups of spray groups are arranged. , the nozzles of the first group, the third group and the fifth group are water mist nozzle groups, the number of water mist nozzles in each group is 180, the nozzles of the second group, the fourth group and the sixth group are air-cooled nozzle groups , the numbe...
Embodiment 2
[0081] Taking the light H-shaped steel of Q345B as an example, the size is 750mm×450mm×120mm according to the weight percentage (wt%), including the following components: C: 0.14, Si: 0.50, Mn: 1.50, V: 0.03, Cr : 0.02, the rest is Fe, control impurity content: P≤0.045%, S≤0.045%. The heating furnace gas temperature is 1100°C, the holding time is 100min, and the rolling start temperature is 1100°C.
[0082] The post-rolling cooling path adopts the alternate arrangement mode of water mist cooling and air cooling units. In each cycle, the cooling path length of the water mist cooling unit is 9m, and the cooling path length of the air cooling unit is 2m. A total of 2 cycles and 4 groups of nozzles are arranged. The nozzles of the first and third groups are water mist nozzle groups, and the number of water mist nozzles in each group is 270; the nozzles of the second and fourth groups are air-cooled nozzle groups, and the number of air-cooled nozzles in each group There are 60 uni...
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