Production method of titanium microalloyed q355b hot-rolled strip under non-refining conditions

A technology of micro-alloying and hot-rolling strip steel, applied in metal rolling, manufacturing converters, improving process efficiency, etc., can solve the problems of large addition amount, unstable yield of titanium alloy elements, etc., to reduce sulfuration material level effect

Active Publication Date: 2022-08-09
唐山瑞丰钢铁(集团)有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above operations can reduce the cost of alloying, the amount of titanium-containing materials such as titanium-iron wire, titanium-silicon-calcium composite cored wire is still relatively large, and the yield of titanium alloy elements is unstable and low under non-refining conditions.

Method used

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  • Production method of titanium microalloyed q355b hot-rolled strip under non-refining conditions
  • Production method of titanium microalloyed q355b hot-rolled strip under non-refining conditions
  • Production method of titanium microalloyed q355b hot-rolled strip under non-refining conditions

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Embodiment Construction

[0026] In the following examples, the converter is 120t, the steel grade is Q355 series, the billet shape is 165*505, and the hot rolling mill is 850mm.

[0027] Each embodiment is shown in the following table:

[0028]

[0029]

[0030]

[0031] The strip produced according to the above embodiment has good physical properties and user welding and hot working properties in the subsequent processing of the hot rolling mill, low inclusion level, stable titanium yield under non-refining conditions and simultaneously reduced The content of silicon manganese reduces the production cost and has good promotion value.

[0032] The above are only specific embodiments of the present invention, but the protection of the present invention is not limited to this, and all the equivalent changes or replacements proposed by those skilled in the art to the technical features of the technical solution are included in the present invention. within the scope of protection.

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Abstract

The invention relates to a method for producing titanium microalloyed Q355B hot-rolled strip steel under non-refining conditions. The special feature is that the composition of the sample is controlled to satisfy C: ≤ 0.15-0.20%, Si: 0.06-0.15%, Mn: 0.35-0.55%, S≤0.030%, P≤0.030% by means of converter blowing and ladle blowing argon. , Als: 0.020 ~ 0.030%, Ti: 0.030 ~ 0.050%; through the continuous casting of thermal expansion asbestos washers and the control of the heating temperature 1220 ~ 1240 ℃, the finishing rolling temperature 1065 ~ 1115 ℃, the finishing rolling temperature 930 ~ 1030 ℃, the final The rolling temperature is 840℃~880℃, and the coiling temperature is 605℃~635℃. The ferrotitanium is added without refining furnace to reduce the alloying cost and ensure the uniform yield of titanium alloy, thereby reducing the content of inclusions and ensuring product quality.

Description

technical field [0001] The invention relates to a production process of strip steel, in particular to a production method of titanium microalloyed Q355B hot-rolled strip steel under non-refining conditions. Background technique [0002] Q355B is a low-alloy structural high-strength steel with good mechanical properties and welding properties. It is widely used in high-rise buildings and construction machinery. With the rapid economic development, my country's demand for Q355B is increasing. The quality requirements for this product are getting higher and higher. [0003] The national standard specifically defines the weight content of some elements of Q355B, wherein the C content is not more than 0.24%, Si is not more than 0.55%, Mn is not more than 1.6%, P is not more than 0.035%, S is not more than 0.035%, and Cr is not more than 0.3% %, Ni is not more than 0.3%, Cu is not more than 0.4%, and N is not more than 0.012%. The traditional production method of Q355B has high a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/06C22C38/14B22D11/16C21C5/28B21B1/26B21B37/74
CPCC22C33/06C22C38/02C22C38/04C22C38/06C22C38/14C21C5/28B22D11/16B21B1/26B21B37/74Y02P10/20
Inventor 张龙冉孟伦邓艳通张保菊徐子娟黄莎莎李宏超代高升崔登云王华杨贺程孙仕良齐超群侯朝君孙雅江
Owner 唐山瑞丰钢铁(集团)有限公司
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