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Q390D steel plate and production method thereof

A steel plate and stage technology, applied in the field of Q390D steel plate and its production, can solve the problems of easy cracks in the slab, poor surface quality of the steel plate, high alloy cost, etc., and achieve good surface quality, low cost, and good matching between strength and toughness Effect

Inactive Publication Date: 2020-06-26
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to add micro-alloys such as Nb, V, Ti, etc., and the cost of the alloy is high
After the microalloy is added, the slab is prone to cracks, and the surface quality of the steel plate is not guaranteed

Method used

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  • Q390D steel plate and production method thereof
  • Q390D steel plate and production method thereof
  • Q390D steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The molten steel undergoes RH treatment. The time required for the vacuum to be below 122 Pa during the treatment is 17 minutes, the frequency of electromagnetic stirring during slab continuous casting is 6.5 Hz, the current is 295 A, the reduction positions are 6, 7, and 8, and the reduction is 2.4mm, 2.4mm, 2.2mm, the thickness of the obtained continuous casting billet is 250mm. When the continuous casting billet is heated, a walking heating furnace is used. The continuous casting billet discharge temperature is 1235°C, the total heating time is 280 minutes, and the heating time in the soaking section is 30 minutes. The chemical composition of the slab (weight percentage) is: C0.16%, Si 0.24%, Mn 0.6%, Ti 0.07, P 0.015%, S 0.004%, Als 0.02%, Ca 0.0011%, the balance is Fe and unavoidable 的impurities. Rolled into a steel plate with a thickness of 14mm, the detailed rolling and cooling process is shown in Table 1, the mechanical properties of the obtained steel plate are ...

Embodiment 2

[0034] The molten steel undergoes RH treatment. The time required for the vacuum to be below 122 Pa during the treatment is 18 minutes, the frequency of electromagnetic stirring during slab continuous casting is 6.5 Hz, the current is 295 A, the reduction positions are 6, 7, and 8, and the reduction is 2.4mm, 2.4mm, 2.2mm, the thickness of the continuous casting billet is 250mm. The continuous casting billet is heated by a walking-type heating furnace, the furnace temperature is 1215°C, the total heating time is 220 minutes, and the heating time in the soaking section is 33 minutes. The chemical composition of the slab (weight percentage) is: C 0.18%, Si 0.34%, Mn 0.5%, Ti 0.06%, P 0.014%, S 0.003%, Als 0.035%, Ca 0.0026%, the balance is Fe and non-volatile Impurities to avoid. Rolled into a steel plate with a thickness of 21mm, the detailed rolling and cooling process is shown in Table 3, the mechanical properties of the obtained steel plate are shown in Table 4, and the meta...

Embodiment 3

[0040] The molten steel undergoes RH treatment. The time required for the vacuum to be below 122 Pa during the treatment is 18 minutes, the frequency of electromagnetic stirring during slab continuous casting is 6.5 Hz, the current is 295 A, the reduction positions are 6, 7, and 8, and the reduction is 2.4mm, 2.4mm, 2.2mm, the thickness of continuous casting billet is 250mm. The continuous casting slab is heated by a walking-type heating furnace, the furnace temperature is 1228℃, the total heating time is 245 minutes, and the heating time in the soaking section is 35 minutes. The chemical composition (weight percentage) of the slab is: C 0.17%, Si 0.31%, Mn 0.56%, Ti 0.063%, P 0.013%, S 0.002%, Als 0.033%, Ca 0.0022%, and the balance is Fe and Inevitable impurities. Rolled into a steel plate with a thickness of 18mm, the detailed rolling and cooling process is shown in Table 5, and its mechanical properties are shown in Table 6, and the metallographic structure is as image 3 ...

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Abstract

The invention discloses a Q390D steel plate and a production method thereof and belongs to the field of structural steel. The Q390D steel plate comprises the chemical components in percent by mass: 0.16-0.18% of C, 0.24-0.34% of Si, 0.5-0.6% of Mn, 0.06-0.07% of Ti, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.0011-0.0002% of Ca, 0.02-0.035% of Als and the balance iron and inevitable impurities. By means of proper smelting, continuous casting, heating, rolling and controlled cooling processes, for the obtained Q390D steel plate, the yield strength is between 413 MPaand 456 MPa, the tensile strength is between 522 MPa and 573 MPa, the yield ratio is less than or equal to 0.80, the ductility is between 21.5% and 28%, and the ballistic work at 20 DEG C below zero is between 153 J and 195 J.

Description

Technical field [0001] The invention belongs to the field of structural steel, and specifically relates to a Q390D steel plate and a production method thereof. Background technique [0002] Q390D low-alloy high-strength structural steel plates are widely used in the fields of construction machinery, wind power, bridge construction, and equipment structural parts production. The national standard of Q390D steel plate requires that the impact energy at -20°C is not less than 34J. The steel plate is required to have high strength and good low-temperature toughness. The final structure of Q390D steel plate is generally ferrite + pearlite, and its composition design is generally based on the C-Mn composition design by adding a certain amount of Nb, V, Ti and other microalloys, and through controlled rolling, controlled cooling or heat treatment To fully refine the ferrite grains to ensure that the strength and toughness of the steel plate meet the requirements. [0003] Document CN 10...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/06C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 温利军薛越李浩王国海张满全赵超高军
Owner BAOTOU IRON & STEEL GRP
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