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Production method for controlling head and tail performance differences of TMCP-type steel plates

A production method and technology for steel plates, applied in the field of metallurgy, can solve the problems of increasing the sampling and inspection frequency of the head and tail, reducing the length allowance of the steel plate, and unstable performance of the steel plate, so as to improve the performance difference, the equipment investment is less, and the design requirements are low. Effect

Inactive Publication Date: 2019-05-17
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of such "blackheads" causes unstable performance of the steel plate, increases the frequency of head and tail sampling and inspection, and reduces the length margin of the steel plate. Simply cutting off the head and tail not only causes waste of resources, but also increases production costs. Not advisable

Method used

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  • Production method for controlling head and tail performance differences of TMCP-type steel plates
  • Production method for controlling head and tail performance differences of TMCP-type steel plates
  • Production method for controlling head and tail performance differences of TMCP-type steel plates

Examples

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Effect test

Embodiment 1

[0016] This embodiment is the production method of TMCP type Q345qD steel plate, the rolling specification is 8*2450*10000mm, and the continuous casting slab of 200*1500 type is adopted.

[0017] The production method of the present embodiment TMCP type Q345qD steel plate comprises billet heating process, rolling process, post-rolling cooling process, and concrete process step is as follows:

[0018] (1) Heating process: the temperature of the billet heating section is 1210°C, the temperature of the soaking section is 1200°C; the distance between the two sides of the billet is 1.1m, and the distance between the head and tail of the billet is 1.5m;

[0019] (2) Rolling process: during rolling, the steel is aired with natural repeated swings, and the roll speed is 2.5m / s; before the finishing rolling stage, a water descaling is performed, and the high-pressure dephosphorization water pressure is 20MPa, and the dephosphorization nozzle and the steel surface are inclined at an angl...

Embodiment 2

[0023] This embodiment is the production method of TMCP type X52MS steel plate, the rolling specification is 24*2750*9000 mm, and the continuous casting slab of 200*1500 type is used.

[0024] The production method of the TMCP type X52MS steel plate of this embodiment comprises a billet heating process, a rolling process, and a post-rolling cooling process, and the specific process steps are as follows:

[0025] (1) Heating process: the temperature of the billet heating section is 1215°C, the temperature of the soaking section is 1210°C; the distance between the two sides of the billet is 1.0m, and the distance between the head and tail of the billet is 1.6m;

[0026] (2) Rolling process: during rolling, the steel is aired with natural repeated swings, and the roll speed is 2.0m / s; before the finishing rolling stage, a water descaling is performed, and the high pressure dephosphorization water pressure is 21MPa, and the dephosphorization nozzle and the steel surface are incline...

Embodiment 3

[0030] This embodiment is the production method of TMCP type Q390GJE steel plate, the rolling specification is 80*3100*7500mm, and the continuous casting slab of 300*1800 type is adopted.

[0031] The production method of the TMCP type Q390GJE steel plate of this embodiment comprises a steel billet heating process, a rolling process, and a post-rolling cooling process, and the specific process steps are as follows:

[0032] (1) Heating process: the temperature of the billet heating section is 1230°C, the temperature of the soaking section is 1215°C; the distance between the two sides of the billet is 1.4m, and the distance between the head and tail of the billet is 2.0m;

[0033] (2) Rolling process: during rolling, the steel is aired with natural repeated swings, and the roll speed is 1.7m / s; before the finishing rolling stage, a line of water is used for descaling, and the high pressure dephosphorization water pressure is 25MPa, and the angle of inclination between the dephos...

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Abstract

The invention discloses a production method for controlling head and tail performance differences of TMCP type steel plates. The production method comprises the steps of heating process, rolling process and cooling process after rolling. According to the production method, the problem of the large difference in performance of the same plates in the production process of the TMCP steel plates is effectively solved, and the mechanical performance difference between the heads and the tails of the steel plates and between the heads and the tails of the steel plates and plate bodies is that the yield strength Re is less than or equal to 30 MPa, the tensile strength Rm is less than or equal to 40 MPa, and the impact power KV2 is less than or equal to 20 J. The production method has a wide application range and is suitable for all low alloy (high strength) steel, bridge steel, high performance building structural steel, pipeline steel, marine structure and offshore platform steel with the thickness of 8-150 mm and the strength grade lower than 490 MPa produced by TMCP.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for controlling the head-to-tail performance difference of a TMCP steel plate. Background technique [0002] TMCP technology is a comprehensive project guided by technology, integrating technology, equipment development and steel material development, involving materials, machinery, electrical, automation control and other disciplines. Since the TMCP process can produce high-strength, high-toughness steel without adding too many alloying elements and without complicated subsequent heat treatment, this technology is considered to be an alloy and energy-saving and environmentally friendly. craft. As the market's requirements for TMCP steel continue to increase, the TMCP process itself is also developing in application, and has now become an indispensable technology for the production of low-alloy, high-strength wide and thick plates. [0003] Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/76B21B45/08
Inventor 邓建军李杰王晓书龙杰张朋谷盟森张志军程海林徐腾飞
Owner WUYANG IRON & STEEL
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