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A production method of austenitic stainless steel for controlling cobalt content

A technology of austenitic stainless steel and a production method, which is applied in the production field of austenitic stainless steel for controlling cobalt content and can solve problems such as the inability to meet the use requirements of austenitic stainless steel for nuclear

Active Publication Date: 2021-06-08
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional smelting method of austenitic stainless steel is the production process of EAF+AOD+LF+CCM. The smelting analysis of austenitic stainless steel smelted by this method generally has Co>0.20%, which cannot meet the requirements of nuclear austenitic stainless steel.

Method used

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  • A production method of austenitic stainless steel for controlling cobalt content
  • A production method of austenitic stainless steel for controlling cobalt content
  • A production method of austenitic stainless steel for controlling cobalt content

Examples

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Effect test

Embodiment 1

[0049] Step 1, raw material preparation: 114t of nuclear austenitic stainless steel molten steel smelted in this embodiment requires 70t of dephosphorized molten iron, 38t of ferrochrome, and 9.1t of electrolytic nickel, wherein the chemical compositions of dephosphorized molten iron, ferrochrome and electrolytic nickel are as follows Table 1 shows.

[0050] Table 1 Chemical composition of dephosphorized hot metal, ferrochrome and electrolytic nickel in Example 1

[0051]

[0052] Step 2. AOD process control: smelting in a furnace with a furnace age of 50, AOD reduction slag alkalinity 2.0, desulfurization stage alkalinity 3.0, slag dumping after reduction, ladle slag amount 250mm.

[0053] Step 3, LF treatment process: After the slag is pulled into the station, the temperature is measured at 1578°C, and after 5 minutes of power transmission, 85kg of electrolytic nickel and 210kg of ferrochrome are added, and the temperature is measured again at 1582°C. Blow for 12 minutes...

Embodiment 2

[0056] Step 1, raw material preparation: 110t of nuclear austenitic stainless steel molten steel smelted in this embodiment requires 68t of dephosphorized molten iron, 37t of ferrochrome, and 8.9t of electrolytic nickel, wherein the chemical compositions of dephosphorized molten iron, ferrochrome and electrolytic nickel are as follows Table 2 shows.

[0057] Chemical composition of dephosphorized hot metal, ferrochrome and electrolytic nickel in Table 2 Example 2

[0058]

[0059] Step 2, AOD process control: smelting with a furnace age of 20 furnaces, AOD reduction slag alkalinity 1.9, desulfurization stage alkalinity 2.5, slag dumping after reduction, ladle with slag 200mm.

[0060] Step 3, LF treatment process: After removing slag, enter the station to measure the temperature at 1568°C, add 108kg of electrolytic nickel after 8 minutes of power transmission and temperature rise, measure the temperature again at 1586°C, start weak blowing for 15 minutes, and calm down for ...

Embodiment 3

[0063]Step 1. Raw material preparation: 112t of nuclear austenitic stainless steel molten steel smelted in this embodiment requires 67t of dephosphorized molten iron, 42t of ferrochrome, and 9.25t of electrolytic nickel, wherein the chemical compositions of dephosphorized molten iron, ferrochrome and electrolytic nickel are as follows Table 3 shows.

[0064] Chemical composition of dephosphorized hot metal, ferrochrome and electrolytic nickel in Table 3 Example 3

[0065]

[0066] Step 2, AOD process control: smelting with a furnace age of 80, AOD reduction slag alkalinity 1.8, desulfurization stage alkalinity 2.0, slag pouring after reduction, ladle slag amount 150mm.

[0067] Step 3, LF treatment process: After the slag is pulled into the station, the temperature is measured at 1583°C, and after 3 minutes of power transmission, 72kg of electrolytic nickel and 164kg of ferrochrome are added, and the temperature is measured again at 1582°C. Blow for 12 minutes, and cool do...

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Abstract

The invention discloses a production method of austenitic stainless steel for nuclear use with controlled cobalt content, comprising the following steps of raw material preparation, AOD process control, refining furnace treatment and continuous casting. The austenitic stainless steel smelted in the present invention is smelted with pure molten iron, without adding 300 series scrap steel, and the nickel alloy uses electrolytic nickel. The austenitic stainless steel smelted by this method has a Co content of ≤0.10%, which meets the requirements for the use of nuclear austenitic stainless steel; blast furnace After the molten iron enters the plant, it is firstly treated with slag removal, and then into the DDD for desiliconization and dephosphorization. The pretreated molten iron is mixed into the AOD converter, and then electrolytic nickel and high-carbon ferrochrome are added for production. The treatment process of dephosphorized molten iron ensures the purity of molten steel. At the same time, since the electric arc furnace does not participate in the production, the energy consumption cost of this scheme is effectively reduced, and the cost of steel per ton is reduced by 120 yuan / ton.

Description

technical field [0001] The invention belongs to the field of production and manufacture of austenitic stainless steel for nuclear use, and in particular relates to a production method of austenitic stainless steel for nuclear use with controlled cobalt content. Background technique [0002] The radiation sensitivity of austenitic stainless steel is relatively low, generally after 10 21 n.cm -2 The irradiation effect is obvious only after irradiation, so austenitic stainless steel is the main material for pressurized water reactor core vessel lining, heat shield, pipes, valves, etc. The radiation effect of Co element content in austenitic stainless steel is relatively large, which tends to increase the radiation embrittlement of steel. Therefore, the smelting analysis of Co requires ≤0.20%, and strives to ≤0.10%. At present, the conventional smelting method of austenitic stainless steel is the production process of EAF+AOD+LF+CCM. The smelting analysis of austenitic stainle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/00B22D11/18C22C38/02C22C38/04C22C38/52
CPCB22D11/18C21C7/00C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/52
Inventor 高仁强陈安忠任培东李树民胡桓彰李玉峰
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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