Rare earth treated normalized Q460GJ steel plate for buildings and production method of steel plate
A production method and construction technology, applied in the field of normalized Q460GJ construction steel plate and its production method, can solve the problems of different chemical composition and production process, and achieve excellent laminar tear resistance and low yield strength ratio. , the effect of improving the overall performance
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[0025] Example 1
[0026] The raw molten iron undergoes deep desulfurization of molten iron, converter top and bottom blowing, ladle argon blowing, refining outside the LF furnace, RH vacuum treatment and continuous casting process to obtain a 300mm thick slab with the chemical composition weight percentage shown in Table 1. The heating temperature of the slab is 1220℃, the heating time is 243min, the first-stage rolling temperature is 1190℃, and the relative reduction rate of single pass should be controlled at least 20% for at least two passes. When the thickness of the rolled piece is 120mm, on the roller table After the temperature reaches 910°C, the second stage rolling is carried out, the final rolling temperature is 840°C, and the thickness of the finished steel plate is 60mm. After rolling, the steel plate enters the accelerated cooling (ACC) equipment, and is cooled to 680°C at a rate of 5°C / s, and then cooled by the cooling bed after hot straightening. After finishing ...
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[0027] Example 2
[0028] The embodiment is the same as in Example 1, wherein the heating temperature is 1215°C, the heating time is 230min, the opening temperature of the first stage rolling is 1185°C, the opening temperature of the second stage rolling is 900°C, and the thickness of the rolled piece is 126mm. The final rolling temperature is 850°C, and the thickness of the finished steel sheet is 70mm. The steel plate cooling rate is 6°C / s, and the final cooling temperature is 670°C. The cooling bed is cooled after hot correction. After finishing and shot blasting, it is sent to the normalizing furnace for normalizing treatment, the normalizing temperature is 880℃, the furnace time T is 1.5t+10, the unit of T is min, and t is the thickness of the steel plate in mm. Finally, the finished steel plate can be obtained.
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[0029] Example 3
[0030] The embodiment is the same as in Example 1, wherein the heating temperature is 1210°C, the heating time is 230min, the opening temperature of the first stage rolling is 1190°C, the opening temperature of the second stage rolling is 890°C, and the thickness of the rolled piece is 128mm. The final rolling temperature is 860℃, and the thickness of the finished steel plate is 80mm. The steel plate cooling rate is 8°C / s, and the final cooling temperature is 660°C. The cooling bed is cooled after hot correction. After finishing and shot blasting, it is sent to the normalizing furnace for normalizing treatment, the normalizing temperature is 880℃, the furnace time T is 1.5t+10, the unit of T is min, and t is the thickness of the steel plate in mm. Finally, the finished steel plate can be obtained. Example 3 The metallographic structure at 1 / 2 thickness of the steel plate is as follows figure 2 As shown, the metallographic structure is fine and uniform ferri...
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