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Method for improving secondary skin inclusion of titanium-containing stainless steel billet

A stainless steel and billet technology, applied in the field of improving the sub-skin inclusions of titanium-containing stainless steel billets, can solve problems such as affecting product quality, increasing billet hot grinding, surface peeling, etc., to reduce processing costs and material losses, and reduce the generation of TiN inclusions. , The effect of reducing the inclusion of the sub-skin of the billet

Pending Publication Date: 2021-10-15
鞍钢联众(广州)不锈钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of titanium-containing stainless steel is difficult, and the problem of sub-skin inclusions easily occurs, resulting in peeling defects on the surface after pickling, which seriously affects product quality
At present, the production of titanium-containing stainless steel products at home and abroad needs to increase thermal grinding of steel billets, resulting in increased production costs

Method used

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  • Method for improving secondary skin inclusion of titanium-containing stainless steel billet
  • Method for improving secondary skin inclusion of titanium-containing stainless steel billet
  • Method for improving secondary skin inclusion of titanium-containing stainless steel billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Chemical composition: After steelmaking and continuous casting, the composition of 409L stainless steel is controlled as shown in Table 1:

[0021] Table 1 embodiment 1 chemical composition (by mass percentage, all the other are Fe and unavoidable impurity)

[0022] steel type C Si mn P S Cr N Ti [Ti%]·[N%] 409L 0.008 0.3 0.35 0.025 0.0007 11.35 0.008 0.17 0.00136

[0023] In Table 1, [Ti%]·[N%] is the product of Ti and N contents in molten steel.

[0024] (2) Process control conditions, see Table 2:

[0025] Table 2 embodiment 1 process control

[0026]

[0027] Through the above control means, the test billet of this heat is not ground, and then the finished product is produced by hot rolling and cold rolling. The surface condition is shown in figure 1 .

Embodiment 2

[0029] (1) Chemical composition: After steelmaking and continuous casting, the composition of 409L stainless steel is controlled as shown in Table 3:

[0030] Table 3 embodiment 2 chemical composition (by mass percentage, all the other are Fe and unavoidable impurity)

[0031]

[0032]

[0033] In Table 3, [Ti%]·[N%] is the product of the contents of Ti and N in molten steel.

[0034] (2) Process control conditions, see Table 4:

[0035] Table 4 embodiment 2 process control

[0036]

[0037] Through the above control means, the test billet of this heat is not ground, and then the finished product is produced by hot rolling and cold rolling. The surface condition is shown in figure 2 .

[0038] In the above embodiments, the free carbon content of the casting powder is detected before use, and the free carbon content of the continuous casting casting powder is controlled to be ≤0.5%, so as to effectively reduce the carbon attached to the surface of the billet. Thro...

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Abstract

The invention relates to a method for improving a secondary skin inclusion of a titanium-containing stainless steel billet. The method comprises the following steps that: during VOD smelting, the vacuum degree is within 3 mbar, and the basicity of slag is controlled to 1.6-2.5; when molten steel enters a VOD furnace, a temperature of the molten steel is controlled to be 1630-1650 DEG C, the content of C in the molten steel is controlled to be 0.28%-0.35%, and the content of Si is controlled to be 0.1% or below; in the VOD deep decarburization process, the stirring amount in an oxygen blowing last stage is controlled to be 300-500 NL / min; after the VOD deep decarburization is finished, the product of the content of Ti and the content of N in the molten steel is 0.003 or below; the continuous casting pulling speed is controlled to be 1.0-1.5 m / min, and the superheat degree is controlled to be 35 + / -5 DEG C; and strong electromagnetic stirring is applied in a secondary cooling stage, and the isometric crystal proportion in a casting blank is not lower than 50%. The method has the advantages of effectively reducing the secondary surface inclusion of the steel billet, realizing no grinding of the steel billet, and reducing the grinding processing cost and material loss.

Description

technical field [0001] The invention relates to a method for improving inclusions in the sub-skin of titanium-containing stainless steel slabs. Background technique [0002] As an important branch of stainless steel, 400 series titanium-containing stainless steel is more and more popular in the market because of its good resistance to intergranular corrosion and excellent welding performance. Among them, 409L, as a representative steel grade of titanium-containing stainless steel, is widely used in automobile exhaust Pipe, stamping products and other industries. However, the production of titanium-containing stainless steel is difficult, and the problem of sub-skin inclusions easily occurs, resulting in peeling defects on the surface after pickling, which seriously affects product quality. At present, the production of titanium-containing stainless steel products both at home and abroad needs to increase hot grinding of steel billets, resulting in increased production costs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/068C21C7/10C21C7/00C22C38/28C22C38/04C22C38/02
CPCC21C7/0685C21C7/10C21C7/0056C21C7/0006C22C38/28C22C38/04C22C38/02C22C38/004
Inventor 文健徐向东方剑锋梁锦明
Owner 鞍钢联众(广州)不锈钢有限公司
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