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Hot rolling low carbon mild steel and production method thereof

A production method and technology for mild steel, applied in the field of metallurgy, can solve the problems of low elongation, difficult to meet elongation low carbon steel, etc., and achieve the effects of high elongation, low cost and strong operability

Inactive Publication Date: 2009-08-12
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the elongation of the steel is low (about 35%), which is difficult to meet the needs of higher elongation low carbon steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 Production and performance measurement of hot-rolled low-carbon mild steel of the present invention

[0017] 120 tons LD converter and 1450 hot continuous rolling mill (6 racks) are used to produce RSC. The production process is: billet → heating → hot rolling → laminar cooling → coiling, the content of C, Mn, Als, N, Ti in the billet The contents are: C: 0.04%, Mn: 0.18%, Als: 0.04%, N: 0.0036%, Ti: 0.008%, and the balance is Fe and unavoidable impurities. The heating temperature in the heating step is 1218°C, the finishing temperature in the hot rolling step is 863°C, and the temperature in the coiling step is 686°C.

[0018] After measurement, the properties of the produced hot-rolled low-carbon mild steel are as follows: the yield strength, tensile strength and elongation are respectively 250MPa, 345MPa and 48%, and there is no coarse grain on the strip steel surface.

Embodiment 2

[0019] Embodiment 2 Production and performance measurement of hot-rolled low-carbon mild steel of the present invention

[0020] 120 tons LD converter and 1450 hot continuous rolling mill (6 racks) are used to produce RSC. The production process is: billet → heating → hot rolling → laminar cooling → coiling, the content of C, Mn, Als, N, Ti in the billet The contents are: C: 0.04%, Mn: 0.21%, Als: 0.04%, N: 0.0023%, Ti: 0.007%, and the balance is Fe and unavoidable impurities. The heating temperature in the heating step is 1207°C, the finish rolling temperature in the hot rolling step is 885°C, and the temperature in the coiling step is 706°C.

[0021] After measurement, the properties of the produced hot-rolled low-carbon mild steel are as follows: yield strength, tensile strength and elongation are 235MPa, 350MPa and 50.5%, respectively, and there is no coarse grain on the surface of the strip.

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Abstract

The invention relates to hot-rolled low-carbon mild steel and a production method thereof, and belongs to the field of metallurgy. The technical problem to be solved by the invention is to provide the hot-rolled low-carbon mild steel of which the elongation percentage A50 is more than or equal to 45 percent, and the production method thereof. The low-carbon mild steel comprises the following chemical compositions in percentage by weight: 0.02 to 0.07 percent of carbon, 0.15 to 0.30 percent of manganese, 0.015 to 0.08 percent of aluminum, 0.004 to 0.020 percent of titanium, less than or equal to 0.0040 percent of nitrogen, less than or equal to 3.43 of titanium / nitrogen, and the balance of iron and inevitable impurities. The low-carbon mild steel has the superior performances of low yield strength, high elongation percentage, no generation of coarse grains on the surface of strip steel, and the like, and is suitable for preparing various components requiring stamping forming.

Description

technical field [0001] The invention relates to hot-rolled low-carbon mild steel and a production method thereof, belonging to the field of metallurgy. Background technique [0002] In recent years, with the wide application of hot-rolled low-carbon steel in construction, automobile and other industries, the research on the chemical composition and hot-rolling process of hot-rolled low-carbon steel has also made great progress. There are related reports about changing the properties of hot-rolled low-carbon steel by changing the chemical composition or hot-rolling process of hot-rolled low-carbon steel. [0003] For example, the patent application with application number 200510012895.1 discloses a low-carbon steel rolled by ferrite process. The chemical composition of the steel is: C: 0.01~0.06%, Mn≤0.40%, S≤0.01%, P ≤0.03%, Si≤0.04%, Al: 0.01-0.05%, the balance is Fe and unavoidable impurities. At the same time, the steel can also contain Cr, B, Nb or Ti. The hot rolling...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02B21B37/74
Inventor 李军王平利刘勇尤秀妆李正荣
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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