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

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...

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.

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