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Production method for improving yield of low-Si alloy steel plate

A production method and yield technology, which is applied in the production field of improving the yield of low-Si alloy steel sheets, and can solve the problems of low yield of low-Si alloy steel sheets, loss of yield of low-Si alloy steel, difficulty in floating slag and inclusions, etc. , to achieve the effect of reducing the amount of steel passing, improving the quality and reducing the tail delamination defects

Pending Publication Date: 2021-09-21
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield loss of low-Si alloy steel mainly comes from the following aspects: firstly, due to the steel ingot itself, the riser shrinkage cavity segregation is serious, and the riser needs to be removed after the steel plate is rolled; secondly, due to the high alloy content of low-Si alloy steel, the low Si composition causes steel The fluidity of the liquid is poor, and it is difficult for the slag and inclusions to float up during the pouring process, and it is easy to have delamination defects if they remain at the tail of the ingot body, and the delamination defects must be removed; finally, the single weight of the steel ingot is thick, so in order to ensure the heating quality of the steel ingot, it takes a long time Heating time, serious burning loss during heating
The above reasons lead to low yield of low-Si alloy steel plate, which in turn causes greater economic losses.

Method used

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  • Production method for improving yield of low-Si alloy steel plate
  • Production method for improving yield of low-Si alloy steel plate
  • Production method for improving yield of low-Si alloy steel plate

Examples

Experimental program
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Effect test

Embodiment 1－8

[0017] Examples 1-8 The molten steel is refined in the LF furnace, using the deoxidation method of weak deoxidation first, and then strong deoxidation. The deoxidizer in the weak deoxidation process uses carbon powder and calcium carbide, and the strong deoxidation process uses Al deoxidation, and then in the VD furnace Vacuum treatment is carried out, and the composition and content of the obtained molten steel are shown in Table 1, and then the molten steel is mold-cast, and then the obtained steel ingot is heated in a heating furnace. The amount of deoxidizer added to the LF furnace, the vacuum degree of the VD furnace and the holding time under this vacuum degree are shown in Table 2. 0 , at each time t, the increase value of steel flow is △Q, and the maximum steel flow is Q 1 , Die casting pass steel parameters and mold flux parameters are shown in Table 3. During the heating process of the steel ingot in the heating furnace, a slight positive pressure is maintained. The...

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Abstract

The invention provides a production method for improving a yield of low-Si alloy steel plate, wherein in a steel ingot pouring process, die casting protection slag has a thickness of 20 mm to 40 mm; in an initial stage of pouring, a steel feeding speed is 2.5 t / min to 2.8 t / min, then the steel feeding speed is gradually increased, and a maximum steel feeding speed is 3.5 t / min to 4 t / min. Each produced steel plate has a weight of 20 t to 39 t, the loss caused by a layering defect of the tail of the steel plate is smaller than or equal to 3 t, and the yield is increased by 5-10%.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a production method for improving the yield of a low-Si alloy steel plate. Background technique [0002] Low-Si alloy steel plate is the main steel used in the manufacture of hydrogenation chemical equipment. The steel plate contains more high-temperature resistant alloy elements such as Cr, Mo, V, etc., coupled with the design of low-Si composition, in order to ensure that the low-Si composition of molten steel meets the requirements, the smelting In the process, multiple slag avoidance and slag making operations are required, which increases the smelting cycle, and the production cost in the steel ingot smelting stage is high. [0003] In the iron and steel industry, the ratio of the weight of the finished steel plate to the weight of the input material is the yield of the steel plate. The yield loss of low-Si alloy steel mainly comes from the fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00C21C7/06C21C7/10C21D9/70C22C38/02C22C38/04C22C38/22C22C38/24
CPCB22D7/00C21C7/06C21C7/0025C21C7/0006C21C7/10C22C38/02C22C38/04C22C38/22C22C38/24C21D9/70
Inventor 李建朝赵国昌李杰侯敬超龙杰袁锦程吴艳阳庞辉勇牛红星尹卫江李样兵王东阳顾自有赵紫娟岳欣欣
Owner WUYANG IRON & STEEL
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