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An Artificial Accelerated Simulation Method for Natural Aging of Rapidly Cooled Steel Plates

A natural aging and rapid cooling technology, applied in the field of steel rolling, can solve the problems of less attention and lack of research on the natural aging of steel plates, and achieve the effect of shortening the time for aging performance changes, low equipment requirements, and conducive to production rhythm.

Active Publication Date: 2017-05-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low-cost production requires reduced production of alloying elements, which requires rapid cooling to refine grains to compensate for the loss of strength index caused by the reduction of alloying elements, but this will make the aging problem more prominent, and the steel plate after rolling Less attention has been paid to the issue of natural aging, and there is a lack of systematic research, and there are few reports on the control method of accelerating the simulation of natural aging

Method used

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  • An Artificial Accelerated Simulation Method for Natural Aging of Rapidly Cooled Steel Plates
  • An Artificial Accelerated Simulation Method for Natural Aging of Rapidly Cooled Steel Plates
  • An Artificial Accelerated Simulation Method for Natural Aging of Rapidly Cooled Steel Plates

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Effect test

Embodiment 1

[0033] A kind of artificial acceleration simulation method of natural aging of fast cooling steel plate provided by the present invention comprises the following steps:

[0034] (1) The selected steel plate is plain carbon steel, and its chemical composition (mass percentage) is C: 0.13% to 0.25%; Si: 0.10% to 0.40%; Mn: ≤1.10%; P: ≤0.015%; S: ≤ 0.010%; Als: 0.01% ~ 0.05%; N: 0.002% ~ 0.01%; the balance is Fe and unavoidable impurities;

[0035] (2) The thickness of the selected steel plate is 10-50mm;

[0036] (3) Carry out the controlled rolling and controlled cooling process. The parameters in the controlled rolling and controlled cooling process are: heating temperature is 1150-1250°C; final rolling temperature is 810-870°C; cooling rate is 10-30°C / s; 540-600°C; straightening temperature is 520-580°C;

[0037] (4) Adopt an orthogonal control process that artificially accelerates to simulate natural aging, specifically: the heating temperature is 150-200°C, the holding ti...

Embodiment 2

[0050] Embodiment 2: a method for artificially accelerating simulated natural aging control of a rapidly cooled steel plate, comprising the following steps:

[0051] (1) The mass percentage of the chemical composition of the selected steel plate is: C: 0.17%, Mn: 0.92%, P: 0.010%, S: 0.008%, Si: 0.25%, Als: 0.030%, N: 0.0050%, and the balance It is Fe and unavoidable impurities.

[0052] (2) The thickness of the steel used is 14mm.

[0053] (3) Carry out the controlled rolling and controlled cooling process. The parameters in the controlled rolling and controlled cooling process are: heating temperature: 1205°C, final rolling temperature: 862°C, cooling rate: 18°C / s, reddening temperature 597°C, straightening temperature : 585°C.

[0054] (4) Orthogonal control process using artificial acceleration to simulate natural aging: temperature selection 150, 200 ℃, holding time selection 0.5, 1h, 2h, 3h, 4h, test the yield strength, tensile strength and elongation of the steel plat...

Embodiment 3

[0060] Embodiment 3: A method for artificially accelerating and simulating natural aging control of rapidly cooled steel plates, comprising the following steps: (1) The mass percentages of the chemical components of the selected steel plates are: C: 0.162%, Mn: 0.95%, P: 0.011%, S: 0.007%, Si: 0.26%, Als: 0.033%, N: 0.0055%, and the balance is Fe and unavoidable impurities.

[0061] (2) The thickness of the steel used is 20mm.

[0062] (3) Carry out the controlled rolling and controlled cooling process. The parameters in the controlled rolling and controlled cooling process are: heating temperature: 1215°C, final rolling temperature: 852°C, cooling rate: 22°C / s, reddening temperature 585°C, straightening temperature : 580°C.

[0063] (4) Orthogonal control process using artificial acceleration to simulate natural aging: temperature selection 150, 200 ℃, holding time selection 0.5, 1h, 2h, 3h, 4h, test the yield strength, tensile strength and elongation of the steel plate.

...

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Abstract

The invention discloses a method of manual accelerated simulation of natural aging of a rapid cooling steel plate. The method comprises a controlled rolling and controlled cooling process, wherein in the controlled rolling and controlled cooling process, the heating temperature is 1150-1250 DEG C, the finish rolling temperature is 810-870 DEG C, the cooling speed is 10-30 DEG C / s, the red-returning temperature is 540-600 DEG C, and the straightening temperature is 520-580 DEG C. The method further comprises an orthogonal control process of manual accelerated simulation of natural aging. The orthogonal control process specifically comprises the following steps: setting the heating temperature at 150-200 DEG C, setting the insulating time of 0.5-5 hours and controlling the cooling speed at less than or equal to 1 DEG C / s. The control method disclosed by the invention can simulate the performance change of the steel plate after natural aging. The trend obtained after implementation is consistent with the change trend of the natural aging performance, so that the method can be used for quickly detecting the aging performance change of the steel plate without affecting the rhythm of production, but also facilitates smoothness of supply of materials.

Description

technical field [0001] The invention relates to an artificial accelerated simulation method for the natural aging of a rapidly cooled steel plate, which belongs to the technical field of steel rolling. Background technique [0002] In the current steel rolling technology, the steel plates are stacked in the lower cooling bed after the controlled rolling and controlled cooling process, and undergo natural aging. After rolling, the strength of the steel plate often decreases. Through specific analysis, it is found that the reasons for the decrease in strength may be: strength fluctuation caused by chemical composition segregation; strength decrease caused by steel defects; strength decrease caused by unstable production process, performance fluctuation caused by inspection factors; The performance of the steel plate has changed during the placement process, that is, the phenomenon of natural aging. [0003] The main process of natural aging is: the rolled steel plate is place...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D11/00
Inventor 王从道党军吴年春尹雨群曾周燏
Owner NANJING IRON & STEEL CO LTD
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