A method for controlling mottle on the surface of steel plates for welded structures
A control method and technology of welding structure, applied in the direction of temperature control, workpiece surface treatment equipment, manufacturing tools, etc., can solve the problems of unsuitable elimination of surface mottle, no component design range, etc. Spot defects, dense and uniform effect of iron oxide scale
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Embodiment 1
[0032]Example 1: Production of a 10mm thick steel for welding structures at low temperature, which requires a yield strength of 345MPa or more, a tensile strength of 470-630MPa, a longitudinal impact energy of -40°C ≥ 34J, and a carbon equivalent CEV ≤ 0.38%. It is applied to appearance structures parts, which have high requirements on the surface of the steel plate. Produce the steel plate that meets user's requirement by the method of the present invention, concrete steps are as follows:
[0033] (1) The composition weight percentage of molten steel is: C: 0.12%, Mn: 1.50%, Si: 0.12%, Nb: 0.025%, Ti: 0.010%, P: 0.009%, S: 0.002%, Cr: 0.015%, Mo: 0.003%, V: 0.003%, Ni: 0.007%, Cu: 0.013%, and the balance is iron and impurities; CEV: 0.38%. Continuous casting slab thickness is 150mm,
[0034] (2) Send the continuous casting slab into the heating furnace, the total time in the furnace is 135min, the soaking period is 25min, the temperature difference between the head and the ...
Embodiment 2
[0040] Example 2: To produce a kind of steel for welding structure for a machinery manufacturing enterprise, the thickness is 16mm and 25mm, the yield strength is required to be above 355MPa, the tensile strength is 490-610MPa, the carbon equivalent CEV is less than or equal to 0.38%, and the steel plate must not have cracks after shot peening spots, can be directly painted coating. The steel plate meeting user's requirements is produced by the method of the present invention, and concrete steps are as follows:
[0041] (1) The composition weight percentage of molten steel is: C: 0.18%, Mn: 1.00%, Si: 0.05%, Nb: 0.030%, Ti: 0.015%, P: 0.012%, S: 0.010%, Cr: 0.018%, Mo: 0.003%, V: 0.004%, Ni: 0.008%, Cu: 0.015%, the balance is iron and impurities, CEV: 0.35%. The thickness of the continuous casting slab is 220mm.
[0042] (2) Send the continuous casting slab into the heating furnace. For the slab of rolling 16mm thick steel plate, the total time in the furnace is 200min, the ...
Embodiment 3
[0049] Embodiment 3: produce a kind of 6mm thick steel plate for welding structure, carry out according to the following steps:
[0050] (1) The composition weight percentage of molten steel is: C: 0.15%, Mn: 1.20%, Si: 0.05%, Nb: 0.020%, Ti: 0.012%, P: 0.014%, S: 0.003%, Cr: 0.010%, Mo: 0.05%, V: 0.004%, Ni: 0.004%, Cu: 0.008%, the balance being iron and impurities; CEV: 0.36%. The thickness of the continuous casting slab is 150mm.
[0051] (2) Send the continuous casting slab into the heating furnace. The total time in the furnace is 120 minutes, the soaking period is 21 minutes, the temperature difference between the head and the tail of the slab is 3°C, and the furnace temperature is 1170°C.
[0052] (3) After the slab comes out of the furnace, it is descaled by high-pressure water. The pressure of the descaling system is 22.0-22.8MPa, and the iron oxide scale formed on the slab in the heating furnace is completely removed.
[0053] (4) Roll the descaled slab into a 6mm ...
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