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Production process of steel substrate for high quality filter

A production process and filter technology are applied in the production process field of steel substrates for high-quality filters, which can solve the problems of difficulty, easy oxygen blowing, and difficulty in controlling the temperature drop of molten steel, so as to control the total oxygen and nitrogen content of molten steel, The effect of hot rolled surface defect reduction and stable production process control

Active Publication Date: 2021-04-06
TANGSHAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, it is very difficult to produce steel for filters with a 100t converter and a matching medium slab continuous caster, because the nominal capacity of the converter is small, the temperature drop of molten steel in the entire steelmaking process is difficult to control, and the RH process is easy to blow oxygen, and then In addition to the pollution of refractory materials in continuous casting, it is a challenging and innovative task to control the cleanliness of steel used in filters

Method used

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  • Production process of steel substrate for high quality filter
  • Production process of steel substrate for high quality filter
  • Production process of steel substrate for high quality filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: The production process of the steel substrate for the high-quality filter is as follows.

[0041] (1) Desulfurization of molten iron: the molten iron S after desulfurization is 0.005wt%.

[0042] (2) Converter smelting: the temperature of the molten iron entering the furnace is 1350°C, the molten iron entering the furnace is C 4.1%, S0.005%, P 0.110%; the final slag basicity R is 3.95, and the components of the molten steel after the furnace are: C 0.045%, S 0.009% , P 0.009%, O 680ppm; end point temperature 1705°C. Bottom blowing and strong stirring for 120 seconds after pulling carbon, bottom blowing flow rate 0.18m 3 / t*min, the steel is tapped directly after strong stirring, and the tapping time is 3 minutes. Lime is added when 1 / 3 of the molten steel is tapped, and the amount of lime is 3.5kg / ton of steel; after tapping is completed, close the bottom of the ladle to blow argon, and add 100kg of modifier.

[0043] (3) RH treatment: deep decarburizat...

Embodiment 2

[0049] Embodiment 2: The production process of the steel substrate for the high-quality filter is specifically as follows.

[0050] (1) Desulfurization of molten iron: the molten iron S after desulfurization is 0.003wt%.

[0051] (2) Converter smelting process: the temperature of the molten iron entering the furnace is 1300°C, the molten iron entering the furnace is 4.0%, S 0.003%, and P0.120%; the final slag basicity R is 3.50, and the components of the molten steel after the furnace are: C 0.020%, S 0.008 %, P 0.010%, O720ppm; end point temperature 1690°C. After pulling the carbon and stirring for 140 seconds, the bottom blowing flow rate is 0.15m 3 / t*min, the steel is tapped directly after strong stirring, and the tapping time is 3 minutes. Lime is added when 1 / 3 of the molten steel is tapped, and the amount of lime is 3.5kg / t steel; after the tapping is completed, argon is blown at the bottom of the ladle and 120kg of modifier is added.

[0052] (3) RH treatment proces...

Embodiment 3

[0058] Embodiment 3: The production process of the steel substrate for the high-quality filter is specifically as follows.

[0059] (1) Desulfurization of molten iron: the molten iron S after desulfurization is 0.005wt%.

[0060] (2) Converter smelting process: the temperature of molten iron entering the furnace is 1280°C, the molten iron entering the furnace contains C 4.0%, S 0.005%, and P0.126%; the final slag basicity R is 4.50, and the composition of molten steel discharged from the furnace: C 0.025%, S 0.010 %, P 0.009%, O900ppm; end point temperature 1710°C. Bottom blowing and strong stirring for 130 seconds after pulling carbon, bottom blowing flow rate 0.15m 3 / t*min, the steel is tapped directly after strong stirring, and the tapping time is 3.2 minutes. Lime is added when 1 / 3 of the molten steel is tapped, and the amount of lime is 4.0kg / t steel; after tapping is completed, argon is blown at the bottom of the ladle and 200kg of modifier is added.

[0061] (3) RH ...

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Abstract

The invention discloses a production process of a high-quality filter steel base plate, which includes molten iron desulfurization, converter smelting, RH treatment, medium slab continuous casting, slab heating and hot rolling; the molten iron desulfurization process: molten iron desulfurization to S≤0.005%; in the converter smelting process, the final slag basicity is 3.5-4.5, C 0.020%-0.045%, S≤0.010%, P≤0.010% in tapping molten steel, end point temperature ≥1690°C, end point oxygen Control the temperature at 500-900ppm, do not take molten steel samples after carbon drawing in the converter, tap the steel directly after bottom blowing and strong stirring, and the tapping time is ≥3 minutes; the RH treatment process adopts the deep decarburization mode, and the decarburization time is ≥14min , RH oxygen blowing volume control ≤ 100m 3 , After the alloy is added, the vacuum cycle time is ≥8min. The production process is stable and can effectively control the total oxygen and nitrogen content of molten steel; hot-rolled surface defects are reduced, and the inclusion level of the hot-rolled substrate is controlled below 1.5.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy technology, in particular to a production process of a steel substrate for a high-quality filter. Background technique [0002] The steel used for automotive filters is made of cold-rolled deep-drawing steel raw materials for deep-drawing processing, and the thinnest position can reach less than 0.4mm. If the size and quantity of steel inclusions are too large, blisters will easily appear during the stamping and thinning process. Defects, so the control of inclusions in this type of steel is stricter. At present, the composition of steel for filters mostly adopts ultra-low carbon steel components, the brand is SPHETi, and its composition range is as follows (wt): C≤0.01%, Si≤0.80%, Mn≤0.30%, P≤0.012%, S≤ 0.012%, Alt≥0.020%, Ti≥0.030%, and the balance is Fe and unavoidable impurities. [0003] The production process of ultra-low carbon steelmaking mainly includes: hot metal desu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/06C21C7/064C21C7/068C21C7/10C22C38/02C22C38/04C22C38/06B22D11/16
CPCB22D11/16C21C1/02C21C7/06C21C7/064C21C7/068C21C7/10C22C38/02C22C38/04C22C38/06
Inventor 马德刚李经哲李波王耐路博勋尹宽王建兴杨杰田俊强
Owner TANGSHAN IRON & STEEL GROUP