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Method for reducing center segregation of low-alloy steel continuous casting billet

A technology for low alloy steel and continuous casting slabs, which is applied in the field of reducing central segregation of low alloy steel continuous casting slabs

Active Publication Date: 2021-08-03
ANSTEEL BEIJING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The method for reducing central segregation of low-alloy steel continuous casting slabs provided according to the embodiments of the present invention aims at improving the internal segregation quality of low-alloy steel continuous casting slabs for the problem of low pass rate of internal segregation of low-alloy high-strength steel slabs

Method used

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  • Method for reducing center segregation of low-alloy steel continuous casting billet
  • Method for reducing center segregation of low-alloy steel continuous casting billet
  • Method for reducing center segregation of low-alloy steel continuous casting billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The original specific control process of the continuous casting machine production is as follows:

[0052] (1) AH36 steel production composition control range

[0053] The continuous casting machine controls the composition according to Table 1 when producing high-strength ship plate steel AH36.

[0054] Table 1 Composition / wt% of high-strength ship plate steel AH36

[0055]

[0056] (2) AH36 steel molten steel pouring temperature and casting speed of continuous casting machine

[0057] When the continuous casting machine produces high-strength ship plate steel AH36, the pouring temperature and casting speed of the continuous casting machine are shown in Table 2.

[0058] Table 2 Continuous casting parameters of original high-strength ship plate steel AH36

[0059] target carbon equivalent range Test molten steel pouring temperature / ℃ Pulling speed of test casting machine / m / min [Ceq]=0.3-0.4 1525-1550 1.3-1.6

[0060] (3) Production opera...

Embodiment 2

[0063] In the present embodiment, when this continuous casting machine produces AH36 slab, take and comprise the following production control steps:

[0064] (1) According to the center segregation detection results of the AH36 slab in the historical production data, find out the target continuous casting slab;

[0065] (2) Calculate the carbon equivalent of the target continuous casting slab according to the formula (1), and according to the statistical analysis of the carbon equivalent of the target continuous casting slab, when [Ceq]<0.35, the slab center segregation is satisfied under certain conditions Able to achieve 100% pass rate of B0.5 grade, that is, the target carbon equivalent range includes [Ceq]<0.35;

[0066] (3) According to the target carbon equivalent range of [Ceq]<0.35, based on the formula (2), determine the optimal content range of the composition of AH36 steel, that is, to obtain the composition content range of the target molten steel. The composition ...

Embodiment 3

[0074] In the present embodiment, when this continuous casting machine produces AH36 slab, take and comprise the following production control steps:

[0075] (1) According to the center segregation detection results of the AH36 slab in the historical production data, find out the target continuous casting slab;

[0076] (2) Calculate the carbon equivalent of the target continuous casting slab according to the formula (1), and according to the statistical analysis of the carbon equivalent of the target continuous casting slab, when [Ceq]>0.37, the slab center segregation is satisfied under certain conditions It can also achieve 100% pass rate of B0.5 grade, that is, the target carbon equivalent range also includes [Ceq]>0.37;

[0077] (3) According to the target carbon equivalent range of [Ceq]>0.37, based on the formula (2), determine the optimal content range of the components of AH36 steel, that is, the target molten steel component content range, the target molten steel com...

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Abstract

The invention provides a method for reducing center segregation of a low-alloy steel continuous casting billet. The method aims at solving the problem that the qualification rate of internal segregation of the low-alloy high-strength steel casting billet is low. The method comprises the following steps that firstly, according to continuous casting billet production data of a target continuous casting machine, a carbon equivalent range of a target steel type continuous casting billet with qualified center segregation of the target steel type continuous casting billet is obtained through analysis, the component content of the target steel type continuous casting billet is subjected to back calculation, and the optimal molten steel component content range corresponding to the carbon equivalent range of the target steel type in production and the optimal pouring parameter range of the target molten steel are optimized; and therefore, according to the optimal component content range and the optimal pouring parameter range, the low-alloy target steel type continuous casting billet with qualified center segregation can be produced. The molten steel components and the pouring parameters are optimized according to the carbon equivalent range, the production conditions for preparing the target steel type continuous casting billet with qualified internal segregation quality can be found out more accurately, and therefore the center segregation of the low-alloy steel continuous casting billet can be effectively improved, and the internal segregation quality of the low-alloy steel continuous casting billet is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a method for reducing central segregation of low alloy steel continuous casting slabs. Background technique [0002] Continuous casting is an important process in the modern metallurgical production process. The central solidification segregation phenomenon often occurs during the solidification process of the continuous casting slab, resulting in the formation of brittle structures such as martensite or bainite in the central part of the continuous casting slab during rolling. The mechanical properties of steel deteriorate. And the central segregation is often accompanied by the generation of central porosity and central cracks, which further reduces the internal density of the continuous casting slab and the mechanical properties of the steel. [0003] Low-alloy high-strength steel is the most widely used engineering structural steel among steel mate...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/18B22D11/20
CPCB22D11/16B22D11/181B22D11/182B22D11/20
Inventor 于赋志陈志威许孟春
Owner ANSTEEL BEIJING RES INST
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