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Method for improving mechanical property of low-carbon silicomanganese series cold rolling dual-phase steel

A carbon-silicon-manganese-based, dual-phase steel technology, applied in the field of steel rolling, can solve problems such as high equipment capacity requirements and too strict requirements, and achieve the effects of excellent mechanical properties, increased strength, and improved work hardening index.

Active Publication Date: 2013-07-03
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN102943205A discloses a kind of dual phase steel, its alloy design composition is simple, only need to add appropriate amount of C﹑Si﹑Mn﹑Ti, but in the process of TMCP process control, the requirement to the temperature parameter of two controlled cooling after finish rolling is too strict , and can only produce dual-phase steel products with a tensile strength of 580MPa
However, this invention has high requirements on equipment capacity, and 0.5% to 0.7% of precious metal chromium must be added in the alloy composition design, and the highest tensile strength can only reach about 650MPa

Method used

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  • Method for improving mechanical property of low-carbon silicomanganese series cold rolling dual-phase steel
  • Method for improving mechanical property of low-carbon silicomanganese series cold rolling dual-phase steel
  • Method for improving mechanical property of low-carbon silicomanganese series cold rolling dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The chemical composition of the low-carbon silicon-manganese cold-rolled dual-phase steel used is C: 0.06%, Si: 0.25%, Mn: 1.71%, P: 0.003%, S: 0.016%, and the balance is Fe. Its A is measured from the thermal expansion curve c1 and A c3 759 and 890°C, respectively.

[0044] Using the above-mentioned low-carbon silicomanganese dual-phase steel, slabs with a thickness of 70 mm are made by smelting and forging, heated to 1100 ° C, kept for 1 h, and rough rolled. The rough rolling process is 4 passes, and the rough rolling start temperature is 1050 °C to obtain an intermediate billet with a thickness of 20 mm.

[0045] The intermediate billet is subjected to finish rolling, the finish rolling process is 5 passes, the finish rolling start temperature is 980°C, the finish rolling finish temperature is 840°C, and the thickness of the hot rolled plate after finish rolling is 6mm.

[0046] Process 1-I is directly air-cooled to room temperature according to the conventional p...

Embodiment 2

[0055] The chemical composition of the low-carbon silicon-manganese cold-rolled dual-phase steel used is C: 0.11%, Si: 0.14%, Mn: 1.81%, P: 0.015%, S: 0.01%, and the balance is Fe. Its A is measured from the thermal expansion curve c1 and A c3 746 and 854°C, respectively.

[0056] Using the above-mentioned low-carbon silicon-manganese dual-phase steel, slabs with a thickness of 60 mm are made by smelting and forging, heated to 1200 ° C, kept for 1 hour, and rough rolled. The rough rolling process is 4 passes, and the rough rolling start temperature is 1100 °C to obtain an intermediate billet with a thickness of 20 mm.

[0057] The intermediate billet is subjected to finish rolling, the finish rolling process is 5 passes, the finish rolling start temperature is 1000°C, the finish rolling finish temperature is 880°C, and the thickness of the hot rolled plate after finish rolling is 6mm.

[0058] Process 2-I after hot rolling and finishing rolling is directly air-cooled to roo...

Embodiment 3

[0067]The chemical composition of the low-carbon silicon-manganese cold-rolled dual-phase steel used is C: 0.16%, Si: 0.5%, Mn: 1.54%, V: 0.05%, P: 0.019%, S: 0.016%, and the rest The amount is Fe. Its A is measured from the thermal expansion curve c1 and A c3 728 and 865°C, respectively.

[0068] Using the above-mentioned low-carbon silicon-manganese dual-phase steel, slabs with a thickness of 60 mm are made by smelting and forging, heated to 1200 ° C, kept for 1 hour, and rough rolled. The rough rolling process is 4 passes, and the rough rolling start temperature is 1100 °C to obtain an intermediate billet with a thickness of 20 mm.

[0069] The intermediate billet is subjected to finish rolling, the finish rolling process is 5 passes, the finish rolling start temperature is 990°C, the finish rolling finish temperature is 876°C, and the thickness of the hot rolled plate after finish rolling is 6mm.

[0070] Process 3-I after hot rolling and finishing rolling is directly ...

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Abstract

The invention belongs to the technical field of roll steel and relates to a method for improving the mechanical property of low-carbon silicomanganese series cold rolling dual-phase steel. The method comprises the following steps of: smelting and forging the low-carbon silicomanganese series cold rolling dual-phase steel to manufacture a plate blank, heating to 1100-1250 DEG C, carrying out heat preservation, carrying out rough rolling and finish rolling at 820-1100 DEG C, wherein the hot rolling and finish rolling temperature is (Ar3+30) DEG C-(Ar3+100) DEG C, then carrying out laminar cooling to (Ar3-50) DEG C-(Ar3-100) DEG C at cooling rate of 20 DEG C, and carrying out air cooling to room temperature; pickling, heating to (Ac3-50 DEG C)-(Ac3+100 DEG C) after cold rolling by adopting higher than or equal to 80% of rolling reduction, carrying out annealing treatment for 10-20s, carrying out slow cooling to 600-720 DEG C at rate of 5-8 DEG C / s, cooling to 250-300 DEG C at rate of higher than or equal to 30 DEG C / s for isothermal treatment, and carrying out air cooling and water-cooling or naturally cooling to room temperature. A cold rolling dual-phase steel plate with excellent mechanical property can be obtained by adopting the preparation method; the strength, the total percentage elongation after fracture and the work-hardening index of the cold rolling dual-phase steel plate are improved; and the strength of the cold rolling dual-phase steel plate is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for improving the mechanical properties of low-carbon silicon-manganese series cold-rolled dual-phase steel. Background technique [0002] In recent years, issues such as climate change and energy shortage have had an increasingly serious impact on the development of modern industry and people's daily lives. Energy saving, emission reduction, low-carbon environmental protection have become urgent problems to be solved in the industrial development of various countries today. As the symbol and symbol of modern industry, the automobile industry is not only a pillar industry that stimulates the development of the national economy, but also a key industry that consumes a lot of energy, emits high emissions, and causes environmental pollution. The primary problem to be solved. [0003] Safety, comfort, energy saving and environmental protection are the new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02
Inventor 侯晓英王业勤许荣昌
Owner LAIWU IRON & STEEL GRP
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