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Preparation method of ferritic stainless steel for stopper rod

A ferritic and stainless steel technology, applied in the field of preparation of ferritic stainless steel for stoppers, to achieve the effect of microstructure, excellent performance and high purity

Inactive Publication Date: 2021-08-20
AVIC SHANGDA METAL REGENERATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, traditional continuous casting uses aluminum-carbon or magnesium-carbon refractory stoppers. Due to the good fluidity of copper liquid and high purity requirements (purity 99.995%), traditional refractory stoppers cannot be used for casting; Therefore, the present invention proposes a method for preparing ferritic stainless steel for stopper rods

Method used

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  • Preparation method of ferritic stainless steel for stopper rod
  • Preparation method of ferritic stainless steel for stopper rod
  • Preparation method of ferritic stainless steel for stopper rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a technical solution: a ferritic stainless steel for a stopper, the formula of the ferritic stainless steel for a stopper includes the following components: Cr 24.0%, C 0.1%, N 0.10%, and the rest are trace elements.

[0028] Among them, trace elements are Cu and Ni.

[0029] A method for preparing a ferritic stainless steel for a stopper as described above, the preparation method comprises the following steps:

[0030] S1: Quantitative weighing, all raw materials are weighed according to the above components;

[0031] S2: Smelting: Vacuum induction + electroslag process is used to smelt, and the purity and chemical composition of molten steel are strictly controlled;

[0032] S3: Forging / rolling: Through the comparison of different forging process tests, the billet heating temperature is controlled at 900°C, and the final forging / rolling temperature is 750°C.

Embodiment 2

[0034] The invention provides a technical solution: a ferritic stainless steel for a stopper, the formula of the ferritic stainless steel for a stopper includes the following components: Cr 25.0%, C 0.15%, N 0.15%, and the rest are trace elements.

[0035] Among them, trace elements are Cu and Ni.

[0036] A method for preparing a ferritic stainless steel for a stopper as described above, the preparation method comprises the following steps:

[0037] S1: Quantitative weighing, all raw materials are weighed according to the above components;

[0038] S2: Smelting: Vacuum induction + electroslag process is used to smelt, and the purity and chemical composition of molten steel are strictly controlled;

[0039] S3: Forging / rolling: Through the comparison of different forging process tests, the billet heating temperature is controlled at 1100°C, and the final forging / rolling temperature is 650°C.

Embodiment 3

[0041] The invention provides a technical solution: a ferritic stainless steel for a stopper, the formula of the ferritic stainless steel for a stopper includes the following components: Cr 24.40%, C 0.12%, N 0.11%, and the rest are trace elements.

[0042] Among them, trace elements are Cu and Ni.

[0043] A method for preparing a ferritic stainless steel for a stopper as described above, the preparation method comprises the following steps:

[0044] S1: Quantitative weighing, all raw materials are weighed according to the above components;

[0045] S2: Smelting: Vacuum induction + electroslag process is used to smelt, and the purity and chemical composition of molten steel are strictly controlled;

[0046] S3: Forging / rolling: Through the comparison of different forging process tests, the billet heating temperature is controlled at 980°C, and the final forging / rolling temperature is 680°C.

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Abstract

The invention discloses ferritic stainless steel for a stopper rod. A formula of the ferritic stainless steel for the stopper rod comprises the following components of 24.0-25.0% of Cr, 0.1-0.15% of C, 0.10-0.15% of N and the balance of microelements. The invention further discloses a preparation method of the ferritic stainless steel for the stopper rod. The preparation method comprises the following steps of quantitative weighing, smelting and forging / rolling. The material provided by the invention is designed to be high-Cr stainless steel, the content of precious elements such as Ni and Mo is low, the material belongs to a nickel-saving environment-friendly material, and the cost is low. According to the technical scheme, a vacuum induction and electroslag process is adopted for smelting, so that the chemical components can be accurately controlled, and the purity of the steel is high. A product with refined structure and excellent performance can be obtained after forging and rolling.

Description

technical field [0001] The invention relates to the technical field of preparing ferritic stainless steel for stopper rods, in particular to a method for preparing ferritic stainless steel for stopper rods. Background technique [0002] At present, the research and development of stopper rods for copper liquid pouring, the product use environment is copper liquid pouring at 1100 ℃ ~ 1130 ℃, and the flow rate of copper liquid is controlled by stopper rods, half of which are submerged in copper liquid and half of which are exposed in high temperature environment. The product requires continuous service life of more than 7 days, and needs to have excellent high temperature corrosion resistance, high temperature oxidation resistance, and good comprehensive performance. [0003] In the prior art, traditional continuous casting uses aluminum-carbon or magnesium-carbon refractory stoppers. Due to the good fluidity of copper liquid and high purity requirements (purity 99.995%), trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/42B22D29/04B22C9/22B21J5/00
CPCB21J5/002B22C9/22B22D29/04C22C33/04C22C38/001C22C38/42
Inventor 叶强栾吉哲李青史咏鑫
Owner AVIC SHANGDA METAL REGENERATION TECH
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