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Production method for rapidly cooling medium plate after rolling

A technology of rapid cooling and production method, applied in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of reducing rolling efficiency, unable to fully exert the control of fine-grained strengthening carbonitride precipitation, and unable to obtain hardening, etc.

Active Publication Date: 2012-02-08
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low cooling rate, the hardened austenite structure cannot be obtained when the steel plate is cooled after rolling at a higher temperature. If controlled rolling is used, the rolling efficiency will be reduced. Due to the limitation, the effect of fine-grain strengthening and the precipitation control of carbonitrides cannot be fully exerted, and the comprehensive performance of the material is limited to a certain extent.

Method used

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  • Production method for rapidly cooling medium plate after rolling
  • Production method for rapidly cooling medium plate after rolling
  • Production method for rapidly cooling medium plate after rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、25

[0010] Embodiment 1, 25mm hydropower steel (07MnCrMoVR)

[0011] The ingredients are designed as follows:

[0012] C

Si

mn

P

S

Ni

Cr

0.06

0.25

1.45

≤0.012

≤0.006

0.2

0.25

Mo

V

Ti

Nb

Alt

Ceq

0.2

0.05

0.015

0.025

0.04

≤0.44

[0013] The balance is Fe

[0014] The UFC parameters are set as follows:

[0015]

[0016] The target final rolling temperature is 830°C, the start cooling temperature is 780°C, the ultra-fast cooling final cooling temperature is 450°C, the red return temperature is 510°C, and the cooling rate is 35°C / s. In comparison, the average strength is 40MPa higher than that of conventional ACC steel plates, the entire plate is cooled evenly, and the difference between the head, middle and tail of the steel plate is less than 30MPa; the impact energy at low temperature is excellent, and the average i...

Embodiment 2、17

[0018] Embodiment 2, 17.5mm pipeline steel (X70)

[0019] Use ultra-fast cooling to reduce the cost of 17.5mm pipeline steel X70, cancel the addition of 0.045% V alloy, and the composition design is as follows:

[0020] C

Si

mn

P

S

Alt

0.07

0.2

1.6

≤0.015

≤0.003

0.04

Nb

Ti

Cr

Ceq

0.055

0.015

0.25

≤0.43

[0021] The balance is Fe

[0022] The UFC parameters are set as follows:

[0023]

[0024] The rolling process adopts the ultra-fast cooling process, the target final rolling temperature is 830°C, the starting cooling temperature is 790°C, the final cooling temperature is 550°C, and the cooling rate is 40°C / s. After mass production, the ultra-fast cooling process is adopted after removing the alloying element V The comprehensive performance of the production steel plate is stable, and the cost per ton of steel is reduced by 100 yuan.

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Abstract

The invention discloses production method for rapidly cooling a medium plate after rolling, belonging to the technical field of production of medium plates. The method comprises the following process steps of: adjusting an ultrafast cooling (UFC) frame to 300mm+h till the cross point between extension lines of upper and lower nozzles of equipment is positioned on the central line of a steel plate; during ultrafast cooling, setting cooling rules and parameters according to the steel kind, specification as well as required final cooling temperature and cooling speed of the steel plate; startingmiddle spraying, side spraying and air blowing to remove residual water from the surface of steel plate to increase the cooling uniformity, starting UFC equipment, and spraying water onto the steel plate with a gap nozzle and a ganged nozzle for cooling; and controlling the cooling speed and cooling termination point according to the CCT (Continuous Cooling Transformation) curve of steel, whereinthe cooling speeds of steel plates of different thicknesses are 5-80 DEG C / s, and the final cooling temperature is controlled at 450-800 DEG C. The method has the advantages: by controlling the cooling process of the steel plate after rolling, control over phase change and organization is realized, and the aim of enhancing the roughness of the steel plate is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate production, and in particular provides a production method for rapid cooling of medium and heavy plates after rolling. The purpose of toughness. Background technique [0002] At present, laminar flow cooling is mainly used for plate rolling after rolling. Due to the low cooling rate, the hardened austenite structure cannot be obtained when the steel plate is cooled after rolling at a higher temperature. If controlled rolling is used, the rolling efficiency will be reduced. The limitation is that the effect of fine-grain strengthening and the precipitation control of carbonitrides cannot be fully exerted, and the comprehensive performance of the material is limited to a certain extent. Contents of the invention [0003] The purpose of the present invention is to provide a production method for rapid cooling after rolling of medium and heavy plates, mainly to fully exert the capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
Inventor 李鑫磊王普田士平马长文董占斌王立坚田鹏
Owner SHOUGANG CORPORATION
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