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Method for producing medium-thickness steel for engineering machinery by single-stand steckel mill

A technology of steckel rolling mill and construction machinery, which is applied in metal rolling, manufacturing tools, metal rolling, etc., and can solve problems such as slow overall rolling rhythm, long waiting time for heating, thick oxide skin on the surface of steel plates, etc.

Pending Publication Date: 2021-04-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to stabilize the mechanical properties of the steel plate, the controlled rolling and controlled cooling process is generally used for production at present. The controlled rolling and controlled cooling process rolling has the characteristics of high initial rolling temperature, long waiting time before the second stage rolling, and slow overall rolling rhythm. etc., the high heating temperature of the steel billet is likely to cause pitting on the surface of the steel plate, and the steel plate is completely exposed to the air during the temperature control period before the second stage of rolling, which will lead to thicker oxide skin on the surface of the steel plate, and will appear if the scale is not completely removed. Occurrence of scale intrusion phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for producing medium-thickness steel for construction machinery with a single-stand steckel rolling mill in this embodiment, taking Q345B steel with a billet specification of 150×2850×8680 mm and a finished product thickness of 10 mm as an example, through heating, descaling, Optimize the rolling process, formulate a complete production process of low-temperature steel burning + normalizing rolling, and improve the surface quality of medium-thickness mechanical steel produced by a single-stand steckel rolling mill. The specific optimization scheme is as follows:

[0016] (1) The Q345B billet is heated by a walking heating furnace, the heating temperature is 1120°C, the total time in the furnace is 150min, the temperature uniformity is ±10°C, and the soaking time is 30min.

[0017] (2) Roughly descale the blank with a descaling box after it is released from the furnace, and the descaling pressure is 24.5 MPa.

[0018] (3) The rolling pass is 9 passes, the 6th, ...

Embodiment 2

[0021] A method for producing medium-thick steel for construction machinery with a single-stand steckel rolling mill in this embodiment, taking the SS400 steel with a billet specification of 150×2695×8702 mm and a finished product thickness of 11 mm as an example, through heating, descaling, rolling Process optimization of manufacturing, formulate a complete production process of low-temperature steel burning + normalizing rolling, and improve the surface quality of medium-thickness mechanical steel produced by a single-stand steckel rolling mill. The specific optimization scheme is as follows:

[0022] (1) The SS400 billet is heated by a walking heating furnace, the heating temperature is 1110 °C, the total time in the furnace is 125 min, the temperature uniformity is ±8 °C, and the soaking time is 35 min.

[0023] (2) Roughly descale the blank with a descaling box after it is released from the furnace, and the descaling pressure is 25MPa.

[0024] (3) The rolling pass is 9 ...

Embodiment 3

[0027] A method for producing medium-thickness steel for construction machinery with a single-stand steckel rolling mill in this embodiment, taking Q420 steel with a rolled product thickness of 150×3102×3902 mm as an example and a rolled product with a thickness of 8 mm as an example, through heating, descaling , Optimize the rolling process, formulate a complete low-temperature steel-sintering + normalizing rolling production process, and improve the surface quality of medium-thickness mechanical steel produced by a single-stand furnace coil rolling mill. The specific optimization scheme is as follows:

[0028] (1) The Q420 steel billet is heated by a walking heating furnace, the heating temperature is 1125°C, the total time in the furnace is 125min, the temperature uniformity is ±10°C, and the soaking time is 30min.

[0029] (2) Roughly descale the blank with a descaling box after it is released from the furnace, and the descaling pressure is 25MPa.

[0030] (3) There are 1...

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Abstract

The invention discloses a method for producing medium-thickness steel for engineering machinery by a single-stand steckel mill. The surface quality of a steel plate is improved by improving heating, rolling and descaling processes, and a low-temperature heating mode is adopted to heat a steel billet, reduces the occurrence rate of pitted surface defects of the steel plate in a heating link, reduces defects caused by the fact that oxide scales are pressed into the surface of the steel plate in the rolling process, reduces the heating furnace energy consumption and the production cost, and improves the production efficiency.

Description

technical field [0001] The invention relates to a method for controlling the surface quality of a hot-rolled steel plate, in particular to a method for producing a medium-thick steel plate with a high surface quality requirement by using a single-stand furnace coil mill, and belongs to the technical field of steel rolling technology. [0002] A method for producing medium-thickness steel for engineering machinery with a single-stand steckel rolling mill of the present invention is mainly through improving the heating, rolling and descaling processes when rolling medium-thickness engineering machinery steel with a single-stand steckel rolling mill Optimization, using the production method of lowering the steel burning temperature and normalizing rolling to improve the surface quality of the steel plate. The surface color of the steel plate produced after the process improvement is uniform, the water marks caused by laminar flow cooling are significantly reduced, the thickness o...

Claims

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Application Information

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IPC IPC(8): B21B1/30B21B45/00B21B45/04
Inventor 宋思宇刘清华李睿鑫王寅李宏斌范伟杰
Owner NANJING IRON & STEEL CO LTD
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