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Production method for effectively controlling gas content in beam blank

A technology of gas content and production method, which is applied in the direction of manufacturing converters, etc., can solve the problems of undiscovered special-shaped billets and the difficulty of controlling the quality of the casting billet of the special-shaped billet continuous casting machine, so as to reduce pinhole defects, improve the purity of molten steel, reduce Effect of H content

Inactive Publication Date: 2014-12-31
LAIWU IRON & STEEL GRP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

After comparing the quality of the cast slabs of the special-shaped slab continuous caster and other slab continuous casters, it was found that under the same process conditions, the quality of the cast slabs of the slab continuous caster was stable, and no subcutaneous pinhole defects were found, but the special-shaped slabs It is difficult to control the billet quality of continuous casting machine
No public reports have been found on the production method to effectively control the gas content in the shaped billet

Method used

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  • Production method for effectively controlling gas content in beam blank

Examples

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Effect test

Embodiment 1

[0035] Embodiment 1: smelting Q235B steel

[0036] (1) The raw material workshop strengthens material control to ensure that the materials used for production must be kept dry. The main measures are as follows: 1) Before the alloy material enters the baking room, it needs to be baked at a high temperature in an advanced baking kiln, and the baking temperature is 300-400°C; 2) Lime is easy to be affected by moisture, and it is stored in a silo by a circular feeding method. The period is less than 24 hours; 3) The scrap steel into the furnace is added in advance, and the scrap steel is baked by using the temperature in the furnace for 4 minutes; 4) The remaining materials include synthetic slag for converters, carburizers, and rice husks for refining , recarburizer, mold slag for continuous casting, etc., all need to be baked in the baking room before use, and the temperature of the baking room reaches 55-65 °C. (2) Steel scrap is added 2 minutes before converter smelting, then...

Embodiment 2

[0037] Embodiment 2: smelting steel grade Q235B

[0038] Using the same process as in Example 1, the difference is: in step (4), refining 2.0ppm of inbound hydrogen and 2.4ppm of outbound hydrogen.

Embodiment 3

[0040] The smelting steel type Q235B and the process method are the same as those in Example 1, except that the inbound hydrogen for refining is 2.0ppm, and the outbound hydrogen is 2.3ppm.

[0041] The following is an example of smelting Q235B steel according to the existing traditional technology for comparison.

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Abstract

The invention relates to a production method for effectively controlling gas content in beam blank. The production method comprises processes of raw material pre-treating, converter smelting, deoxidation alloying, and refining, wherein the materials maintain dry, the process of adding slag charge is moved forward to avoid adding material operation 3 minutes before the terminal point; the process of modifying converter slag is moved backward, synthesis slag is added on top of the steel slag after the converter furnace has been stocked with steels other than going into the converter furnace with the steel water, synthesis slag is subjected to a ultra-high-temperature baking by utilizing the steel slag to maximumly reduce the water in the synthesis slag and the crystal water contained by the synthesis slag; electrode powder replaces carbon powder to match with carbon in the refining process to reduce the effect of carbon matching on molten steel hydrogenation. The production method can effectively control hydrogen addition in production process, reduces the hydrogen content in molten steel, makes the hydrogen content in the steel stay in a range of 1 to 3 ppm, reduces casting blank pinhole defects, and improves casting blank yield rate.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a production method for effectively controlling the gas content in a shaped billet. Background technique [0002] During the steelmaking process, the quality and performance of steel are seriously affected by the residual hydrogen. The existence of hydrogen in steel will cause defects such as white spots and layered fractures, which will have a very bad effect on the mechanical properties of steel, especially it can form pores, make cracks more sensitive, and seriously reduce the strength, plasticity, and fatigue life of steel and impact toughness and other mechanical properties. According to relevant studies, as long as the hydrogen content in steel is lower than 2.0×10 -6 There will be no white spots, but with the sharp reduction of sulfur content in steel, the sensitivity of steel to produce white spots will increase sharply. Avoiding and controlli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/30
Inventor 温福新郭伟达张佩毕永杰王明杰沈彬彬高山于亮涛王强胡增跃张海波
Owner LAIWU IRON & STEEL GRP
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