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Nitrogen-vanadium-titanium-niobium rare earth microalloyed high-strength deep-drawing cold-rolled steel plate and production method thereof

A deep-drawing steel plate and micro-alloying technology, which is applied in the field of nitrogen-vanadium-titanium-niobium rare-earth micro-alloyed deep-drawing cold-rolled steel plate and its production, nitrogen-vanadium-titanium-niobium rare-earth micro-alloyed high-strength deep-drawn steel plate and its production field, can Solve problems such as complex production process parameters, poor coating adhesion, and low strength

Active Publication Date: 2022-06-24
长沙东鑫环保材料有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Many technical problems in the existing production of high-strength deep-drawing cold-rolled steel sheets have not been resolved, especially the cold-rolled deep-drawing steel represented by IF steel has disadvantages such as low strength, cold-working brittleness, and poor coating adhesion; High-strength deep-drawing cold-rolled steel sheets represented by hardened steel, dual-phase steel, TRIP steel and multi-phase ultra-high-strength steel have technical difficulties such as complex production process parameters, long process control links, large equipment investment, and low deep-drawing indicators. The first purpose of the invention is to provide a high-strength deep-drawing steel plate treated with nitrogen, vanadium, titanium, niobium, and rare earth microalloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]Transfer 125 tons of blast furnace molten iron to the desulfurization station outside the molten iron furnace, and use the KR method to carry out the molten iron desulfurization treatment. The temperature of the molten iron at the station is 1405 ℃, and the components of the molten iron: C4.51%, Si0.38%, Mn0.41%, P0.101% , S0.042%; adding desulfurizer (lime 55% + calcium carbide 35% + 10% metal magnesium powder) to the molten iron totaling 4.2Kg / ton, stirring for 15 minutes, sampling the sulfur content of molten iron 0.00089%, removing the desulfurization slag, and measuring the temperature At 1326℃, pour molten iron into a converter with a nominal capacity of 150 tons, then add 30 tons of scrap steel, and start blowing. Quickly form slag and dephosphorize, then press down and grab the position, and turn on the bottom blowing mode. According to the composition and temperature of molten iron after desulfurization and the composition and temperature of molten steel at the...

Embodiment 2

[0055] Transfer 86 tons of blast furnace molten iron to the desulfurization station outside the molten iron furnace, and use the KR method to carry out the molten iron desulfurization treatment. The temperature of the molten iron at the station is 1396 ℃, and the components of the molten iron: C4.38%, Si0.42%, Mn0.39%, P0.096% , S0.035%; add desulfurizer (lime 50% + calcium carbide 32% + metal magnesium powder 18%) to 3.6Kg / ton of molten iron, stir for 12 minutes, sample the sulfur content of molten iron 0.00081%, remove the desulfurization slag, measure the temperature at 1332 ℃, pour molten iron into a converter with a nominal capacity of 100 tons, and then add 21 tons of scrap steel,

[0056] Start blowing, in the early stage, properly increase the oxygen lance to grab the position, add lime and ferrous oxide-containing sludge or iron oxide scale, quickly form slag and dephosphorize, then lower the grab position, and turn on the bottom blowing mode, according to the composit...

Embodiment 3

[0063] Transfer 180 tons of blast furnace molten iron to the desulfurization station outside the molten iron furnace, and use the KR method to carry out the molten iron desulfurization treatment. The temperature of the molten iron at the station is 1453 ℃, and the components of the molten iron: C4.45%, Si0.41%, Mn0.42%, P0.102% , S0.055%; 4.5Kg / ton of desulfurizer (lime 85% + calcium carbide 15%) was added to ton of molten iron, stirred for 13 minutes, the sulfur content of the molten iron was 0.00085%, the desulfurization slag was cleaned, the temperature was measured at 1393 ° C, and the molten iron was mixed with In the converter with a nominal capacity of 200 tons, then add 28 tons of scrap steel, and start blowing. In the early stage, the oxygen lance is appropriately increased to grab the position, and lime and sludge or iron oxide scale containing ferrous oxide are added to quickly form slag and dephosphorize. Press down the grab position, and turn on the bottom blowing ...

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Abstract

The invention discloses a nitrogen-vanadium-titanium-niobium rare earth microalloyed high-strength deep-drawing cold-rolled steel plate and a production method thereof. According to the invention, microalloyed elements are fully utilized to be combined with residual interstitial atoms carbon and nitrogen in steel and added trace nitrogen atoms to generate different types of carbonitrides; the solid solubility of free interstitial atoms carbon and nitrogen in the steel is reduced to the minimum, a very small amount of solid solution rare earth elements is guaranteed, formation of {111} / / ND texture is promoted, and the r value and the n value of the cold-rolled steel sheet are greatly increased; under the action of factors such as temperature, deformation and cooling rate, the sizes and distribution of different types of carbonitride precipitates are controlled, thicker micron-sized precipitates are beneficial to formation of {111} / / ND textures, and dispersed and uniformly distributed nanoscale vanadium carbonitride, titanium carbonitride, niobium carbonitride and rare earth carbonitride hinder dislocation movement, so that the strength of the steel is improved; and under the condition of ensuring proper coarsening of the crystal grains, formation of cake-shaped crystal grains is promoted, and the deep drawing performance is greatly improved.

Description

technical field [0001] The invention relates to a nitrogen-vanadium-titanium-niobium rare earth microalloyed deep-drawing cold-rolled steel sheet and a production method thereof, in particular to a nitrogen-vanadium-titanium-niobium rare earth microalloyed high-strength deep-drawing steel sheet and a production method thereof, belonging to the preparation of cold-rolled steel sheets technical field. Background technique [0002] Cold-rolled steel sheets for stamping are widely used in vehicles, ships, household appliances, engineering construction and other industries, especially in the automotive industry, cold-rolled steel sheets for car bodies account for more than 50% of automotive steel. Cold-rolled stamped steel has gone through three generations of technology, the first generation of boiling steel such as 08F steel; the second generation of aluminum killed steel such as 08Al steel; the IF steel currently produced and used in batches belongs to the third generation of ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D1/26C21D6/00C21D8/02C22C33/06
CPCC22C38/004C22C38/02C22C38/04C22C38/06C22C38/001C22C38/005C22C38/12C22C38/14C22C38/002C21D1/26C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D8/0273C22C33/06
Inventor 吴光亮吴昊天肖业明
Owner 长沙东鑫环保材料有限责任公司
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