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Method for improving high plasticity of low-carbon silicomanganese cold-rolling transformation induced plasticity steels

A technology of phase change induced plasticity and carbon silicon manganese system, which is applied in the field of steel rolling, can solve the problems not mentioned and achieve the effect of improving strength

Active Publication Date: 2013-07-10
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mention of how to obtain high-strength and high-plasticity low-carbon steel series preparation technology with a carbon content of ≤0.3%.

Method used

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  • Method for improving high plasticity of low-carbon silicomanganese cold-rolling transformation induced plasticity steels
  • Method for improving high plasticity of low-carbon silicomanganese cold-rolling transformation induced plasticity steels
  • Method for improving high plasticity of low-carbon silicomanganese cold-rolling transformation induced plasticity steels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The chemical composition of the low-carbon silicon-manganese cold-rolled phase transformation-induced plasticity steel is C: 0.16%, Si: 1.35%, Mn: 1.51%, P: 0.005%, S: 0.007%, and the balance is Fe . Its A is measured from the thermal expansion curve c1 and A c3 735 and 870°C, respectively.

[0046] The above-mentioned low-carbon silicomanganese-based phase-change-induced plasticity steel is used to produce a 60mm thick slab through smelting and forging, heated to 1100°C, kept for 1 hour, and rough rolled. The rough rolling process is 4 passes, and the rough rolling start temperature at 1050°C, and an intermediate billet with a thickness of 20mm was obtained.

[0047] 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 845°C, and the thickness of the hot rolled plate after finish rolling is 6mm.

[0048] After finishing rolling, air-coo...

Embodiment 2

[0056] The chemical composition of the low-carbon silicon-manganese cold-rolled phase transformation-induced plasticity steel is C: 0.20%, Si: 1.23%, Mn: 1.32%, Nb: 0.0298%, Ti: 0.031%, P: 0.001% , S: 0.004%, the balance is Fe. Its A is measured from the thermal expansion curve c1 and A c3 755 and 880°C, respectively.

[0057] The above-mentioned low-carbon silicomanganese-based phase-change-induced plasticity steel is used to produce a 70mm thick slab through smelting and forging, heated to 1250°C, kept for 1 hour, and rough rolled. The rough rolling process is 4 passes, and the rough rolling start temperature at 1100°C, and an intermediate billet with a thickness of 20mm was obtained.

[0058] 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 6.5mm.

[0059] After fi...

Embodiment 3

[0068] The chemical composition of the low-carbon silicon-manganese cold-rolled phase transformation-induced plasticity steel is C: 0.184%, Si: 1.00%, Mn: 1.87%, P: 0.006%, S: 0.003%, and the balance is Fe . Its A is measured from the thermal expansion curve c1 and A c3 730 and 850°C, respectively.

[0069] The above-mentioned low-carbon silicomanganese-based phase transformation-induced plasticity steel is used to produce a 70mm thick slab through smelting and forging, heated to 1100°C, kept for 1 hour, and rough rolled. The rough rolling process is 4 passes, and the rough rolling start temperature At 1020°C, an intermediate billet with a thickness of 25mm was obtained.

[0070] The intermediate billet is subjected to finish rolling, the finish rolling process is 5 passes, the finish rolling start temperature is 960°C, the finish rolling finish temperature is 840°C, and the thickness of the hot rolled plate after finish rolling is 6.5mm.

[0071] After finishing rolling, ...

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Abstract

The invention belongs to the technical field of rolled steel, and in particular relates to a method for improving high plasticity of low-carbon silicomanganese cold-rolling phase-change induced plasticity steel. The method comprises the following steps of: selecting the low-carbon silicomanganese cold-rolling transformation induced plasticity steels, smelting and forging so as to manufacture plate blanks, heating the plate blanks to be 1100-1250 DEG C, keeping the temperature, rough-rolling and finish-rolling the plate blanks and air-cooling the hot rolled plates to be 600-750 DEGC, coiling, and subsequently pickling so as to obtain steel plates for cold rolling; cold-rolling in a rolling reduction greater than or equal to 80%; heating the cold-rolled steel plates to be (Ac3-40 DEG C) to (Ac3+30 DEG C) at a heating velocity of at least 80 DEG C / s, carrying out annealing treatment for 5-15 seconds, subsequently cooling to a bainite area of 380-450 DEG C at a velocity of 40-80 DEG C / s, carrying out isothermal treatment for 10-50 seconds, and finally cooling to the room temperature. By utilizing the preparation method, cold-rolling transformation induced plasticity steels with high and strong plasticity is obtained, and the strength of the low-carbon silicomanganese cold-rolling transformation induced plasticity steels is greatly improved on the premise that the plasticity is not lost.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for improving the strong plasticity of low-carbon silicon-manganese cold-rolled plastic steel induced by phase transformation. 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 a 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. great challenge. [0003] Safety, comfort, energy saving and environmental protection are the new ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/12C22C38/14C21D8/02
Inventor 侯晓英王业勤许荣昌
Owner LAIWU IRON & STEEL GRP
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