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Method and cooling system for improving comprehensive mechanical property of normalized steel plate

A technology that integrates mechanics and cooling systems, applied in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of not considering the influence of heating on the performance of steel plates, easy adhesion of iron oxide scale to the surface of steel plates, uneven cooling of steel plates, etc. Improve comprehensive mechanical properties, increase yield strength, and stabilize pressure

Active Publication Date: 2014-12-10
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A stable water-air ratio can ensure uniform cooling, and the cooling range is narrow, which requires high surface quality of the steel plate after normalizing. If the steel plate produces scale in the furnace, it is easy to cause uneven cooling of the steel plate when cooling in this way, and Iron oxide scale is easily bonded to the surface of the steel plate
[0011] At the same time, the above two methods only consider the accelerated cooling process of the steel plate after it comes out of the furnace, and do not consider the influence of heating on the properties of the steel plate, which has certain limitations.
[0012] To sum up, accelerated cooling after normalizing has become a main means to improve the strength of normalized steel plates, but the current technology still has some limitations

Method used

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  • Method and cooling system for improving comprehensive mechanical property of normalized steel plate
  • Method and cooling system for improving comprehensive mechanical property of normalized steel plate
  • Method and cooling system for improving comprehensive mechanical property of normalized steel plate

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Embodiment 1

[0040] Taking the steel grade Q370qE as an example, the method of improving the comprehensive mechanical properties of the normalized steel plate is described in detail. The specification of the steel grade Q370qE: thickness 60mm×width 2500mm×length 12000mm.

[0041] The first step: use the empirical formula to calculate the Ac3 temperature point of the steel plate, Andrews formula:

[0042] Ac3=910-203C 1 / 2 -15.2Ni+44.7Si+104V+31.5Mo+13.1W,

[0043] Applicable to C≤0.6wt%, Mn≤4.9wt%, Cr≤5wt%, Ni≤5wt%, Mo≤5.4wt%, (wt% mass percentage), determined according to the calculated value of Ac3 to obtain the steel type Q370qE heating The target temperature is 880±10°C.

[0044] Step 2: The thickness of the steel plate calculates the heating time required for the steel plate to reach the target temperature of normalizing heating. The formula is 1.3~1.6min / mm×steel plate thickness, and the heating time is the running time of the heating zone;

[0045]Comprehensively considering the t...

Embodiment 2

[0063] like Figure 1~6 As shown, a cooling system for improving the comprehensive mechanical properties of normalized steel plates includes a roller table 1, and a water mist cooling device 2 is arranged on the upper and lower sides of the roller table 1, and the sides of the roller table 1 located before and after the water mist cooling device 2 are equipped with The compressed gas purging device 3 with air outlet toward the inner side of the roller table 1, the water mist cooling device 2 includes multiple groups of nozzles 4 arranged above and below the roller table 1, and each group of nozzles 4 is arranged axially along the roller table 1, and from the roller From the edge of the track 1 to the center of the roller track 1, the distance between the nozzles 4 decreases gradually. The steel plate 7 running on the roller table 1 is the steel plate to be cooled through normalizing treatment in the normalizing furnace.

[0064] like Figure 4 , The nozzle 4 used in this emb...

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Abstract

The invention discloses a method for improving the comprehensive mechanical property of a normalized steel plate. The running time of the steel plate in a heating region in a normalizing furnace is reasonably prolonged and the running time of the steel plate in a thermal insulation region in the normalizing furnace is reasonably shortened, so that the austenite grain growth is avoided to provide favorable conditions for subsequent accelerated cooling. The steel plate is quickly cooled to be 600-700 DEG C from the normalizing temperature in a way of normalizing, atomizing and cooling, so that the mist cooling with higher heat exchange efficiency increases the supercooling degree of the structural transformation of the steel plate and effectively prevents the austenite grain growth; and grains are refined, so that the effect of improving the strength by structure refinement in the heat treatment process of the steel plate is given full play. The invention further provides a cooling system for improving the comprehensive mechanical property of the normalized steel plate. Therefore, the equipment is simple, the investment is low, the surface quality of the steel plate can be improved, and the practicality is better.

Description

technical field [0001] The invention relates to a method for improving the comprehensive mechanical properties of a steel plate, in particular to a method for improving the comprehensive mechanical properties of a normalized steel plate and a cooling system thereof. Background technique [0002] The normalizing process is a heat treatment process in which the steel is heated to 30-50 °C above the Ac3 (or Acm) point, kept for a certain period of time, and then cooled in the air. Due to the slow cooling rate of air cooling, the crystal grains will aggregate and grow during the air cooling process, resulting in a decrease in the strength of the steel plate. Therefore, the performance of the steel plate obtained by using the method of air cooling after normalizing will not meet the needs of actual production. If the cooling rate is faster than that of air cooling, a finer structure can be obtained, and the comprehensive mechanical properties of the steel plate will be further im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/28C21D1/00C21D9/00C21D11/00
Inventor 王明亮张俊峰杨波刘贵刚卜勇王成欧阳坤宋晓亮郭晓飞徐印根许友云周维杨斌李永生
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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