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Production technology of Q420qD bridge plate

A production process and bridge plate technology, applied in the direction of manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve the problems of difficult production of low-alloy high-strength plates, backward equipment, high cost, saving money, ensuring fineness, The effect of refining the steel structure

Inactive Publication Date: 2008-05-28
CHONGQING IRON & STEEL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many iron and steel enterprises are relatively difficult to produce low-alloy high-strength plates due to the relatively backward equipment and the influence of hand-made equipment.
If the production device is simply modified, the cost will be relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment produces Q420qD bridge plate 1T, and the thickness of the steel plate is 16mm.

[0016] The Q420qD bridge plate production process in this embodiment includes composition control and controlled rolling process, wherein the controlled rolling process is divided into two stages, the first stage is all the passes of rough rolling and the first rolling process of finish rolling, and the second stage includes The second rolling pass and final rolling of finish rolling are characterized in that the following components are controlled in composition control: C 0.11%, Si 0.20%, Mn 1.3%, Alt 0.02.5%, Nb 0.02%, Ti 0.01%, Ceq 0.4 %, V 0.03%, N 0.014%;

[0017] All passes of the rough rolling and the first rolling process of the finish rolling adopt the conventional steel plate rolling process, the starting rolling temperature of the second rolling process is 890°C, and the cumulative deformation of the second rolling process is 45%; the final rolling temperature is...

Embodiment 2

[0020] The present embodiment produces Q420qD bridge plate 1T, and the steel plate thickness is 26.

[0021] The Q420qD bridge plate production process in this embodiment includes composition control and controlled rolling process, wherein the controlled rolling process is divided into two stages, the first stage is all the passes of rough rolling and the first rolling process of finish rolling, and the second stage includes The second rolling pass and final rolling of finish rolling are characterized in that the following components are controlled in composition control: C0.15%, Si0.3%, Mn 1.5%, Alt 0.03%, Nb0.03%, Ti 0.015%, Ceq 0.42%, V0.05%, N0.015%;

[0022] All the passes of the rough rolling and the first rolling process of the finish rolling adopt the conventional steel plate rolling process, the starting rolling temperature of the second rolling process is 920°C, and the cumulative deformation of the second rolling process is 55%; the final rolling temperature is 870...

Embodiment 3

[0025] The present embodiment produces Q420qD bridge plate 1T, and the steel plate thickness is 27mm.

[0026] The Q420qD bridge plate production process in this embodiment includes composition control and controlled rolling process, wherein the controlled rolling process is divided into two stages, the first stage is all the passes of rough rolling and the first rolling process of finish rolling, and the second stage includes The second rolling pass and final rolling of finish rolling are characterized in that the following components are controlled in composition control: C 0.165%, Si 0.55%, Mn 1.65%, Alt 0.04%, Nb 0.04%, Ti 0.019%, Ceq 0.44%, V 0.075%, N 0.017%;

[0027] All passes of the rough rolling and the first rolling process of the finish rolling adopt the conventional steel plate rolling process, the starting rolling temperature of the second rolling process is 900°C, and the cumulative deformation of the second rolling process is 50%; the final rolling temperature ...

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Abstract

The invention discloses a production technique of Q420qD bridge plate, which comprises component control and controlled rolling process, wherein, the controlled rolling process is divided into two phases: the first phase comprises all the gates of the rough rolling and a first rolling length of the precision rolling, and the second phase comprises a second rolling length of the precision rolling and the finish rolling. The component control controls the following components: 0.11-0.17 percent of C, 0.20-0.55 percent of Si, 1.3-1.7 percent of Mn, 0.02-0.07 percent of Alt, 0.02-0.045 percent of Ti, 0.4-0.45 percent of Ceq; the initial rolling temperature of the second rolling length is 890 DEG C to 920 DEG C, the cumulative deformation of the second rolling length is 45 percent to 55 percent; the finish rolling temperature is 800 DEG C to 870 DEG C; the invention uses the existing equipment of the old steel enterprise to produce qualified and market competitive Q420qD bridge plate without reforming the equipment, thus saving the fund.

Description

technical field [0001] The invention relates to a steel plate production process, in particular to a Q420qD bridge plate production process. Background technique [0002] Low-alloy high-strength steel plates have the advantages of high strength, light weight, short processing cycle, and good seismic performance, and are used more and more widely. Many domestic iron and steel enterprises, due to their late development and relatively advanced equipment, have developed rapidly in the production of low-alloy high-strength steel. However, due to the relatively backward equipment and the influence of hand equipment, many iron and steel enterprises are relatively difficult to produce low-alloy high-strength plates. If the production device is simply modified, the cost is relatively high. At the current stage when the market economy is becoming more and more developed, old steel companies must develop low-alloy high-strength steel plates. With the rapid development of bridge cons...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/74B21B37/58C22C38/14C21D1/28C21D11/00
Inventor 曾兢王鑫郑建华肖亚魏凡杰曹开宸
Owner CHONGQING IRON & STEEL (GRP) CO LTD
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