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Production method of austenitic stainless steel

A technology for austenitic stainless steel and production methods, applied in the direction of improvement of process efficiency, electric furnace, furnace, etc., can solve the problems of reduced ferronickel usage, increased production cost, and large amount of slag in electric furnace, so as to reduce smelting cost and improve Productivity and effects of improving chromium yield

Inactive Publication Date: 2010-12-29
ZHENSHI GROUP EASTERN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, this production process for smelting stainless steel has the following disadvantages: First, the electric furnace mixes the chromium and nickel of the stainless steel mother liquor to the upper and middle limits of the finished product at one time, resulting in low-grade ferronickel in the electric furnace smelting process. Reduced usage increases production costs
The second is that a large amount of nickel-iron, high-carbon ferrochromium and other alloy materials are melted in the electric furnace, resulting in high alloy loss
At the same time, power consumption also increases. Third, a large amount of ferronickel and high-carbon ferrochromium contain high silicon content, resulting in a large amount of electric furnace slag, which is unfavorable to operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method smelting 304 is implemented as follows:

[0018] Chemical composition required by the standard:

[0019] chemical composition%

C

Si

mn

P

S

Cr

Ni

N

internal control

≤0.060

0.30~0.50

1.20~1.50

≤0.045

≤0.009

17.90~18.10

7.95~8.05

0.03~0.06

[0020] Chemical composition of the mother liquor in the electric furnace

[0021] chemical composition%

C

Si

P

Cr

Ni

temperature

internal control

1.5~2.5

0.1~1.5

≤0.045

1~18

4~12

1500~1560

[0022] AOD smelting process:

[0023] 1) Early slag flow

[0024] The temperature of the stainless steel mother liquor blended into the AOD furnace is greater than 1500 degrees. Before AOD slag flow, the basicity is controlled at about 1.4, and a certain amount of high-carbon ferrochrome is added in the early stage. After blowing silicon to 0.5% in the early stage, blow a certain amount of nitrogen ...

Embodiment 2

[0037] This method smelting 316L implements as follows:

[0038] Chemical composition required by the standard:

[0039] chemical composition%

C

Si

mn

P

S

Cr

Ni

Mo

N

internal control

≤0.03

0.40~0.60

1.10~1.30

≤0.035

≤0.005

16.0~16.2

10.0~10.1

2.0~2.1

≤0.06

[0040] Chemical composition of the mother liquor in the electric furnace

[0041] chemical composition%

C

Si

P

Cr

Ni

temperature °C

internal control

1.5~2.5

0.1~1.5

≤0.031

1~18

4~12

1500~1560

[0042] AOD smelting process:

[0043] 1) Early slag flow

[0044] The temperature of the stainless steel mother liquor blended into the AOD furnace is greater than 1500 degrees. Before AOD slag flow, the basicity is controlled at about 1.4, and a certain amount of high-carbon ferrochrome is added in the early stage. After blowing silicon to 0.5% in the early stage, blow a certain amount ...

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Abstract

The invention relates to a production method of austenitic stainless steel, which comprises the following steps of: a, mixing different low-grade nickel-chromium pig iron in an electric furnace, blowing, desiliconizing and decarbonizing to obtain a stainless steel mother liquor; preparing Cr to be about half of a finished product according to the content requirement of a stainless steel finished product, and properly preparing Ni in the stainless steel mother liquor in the electric furnace by using a grade high-carbon ferrochrome; b, adding the stainless steel mother liquor obtained in the step a to an AOD furnace, adding the high-carbon ferrochrome, laterally blasting air, oxidizing by using a gun and flowing out slag; c, adding metallurgical lime, high-carbon ferrochrome, ferronickel and waste steel to carry out primary decarbonization and secondary decarbonization, adjusting carbon content to the level required by the finished product; and e, finely adjusting components and adjusting temperature in an LF furnace to obtain the austenitic stainless steel. The invention has the advantages of low energy consumption, low cost and stable product quality.

Description

technical field [0001] The invention relates to a production method of austenitic stainless steel, belonging to the technical field of metal smelting. Background technique [0002] At present, the smelting process of stainless steel is mainly electric furnace + AOD furnace. The electric furnace is melted into stainless steel mother liquor in the electric furnace according to different grades of high-carbon ferrochromium, ferronickel, scrap stainless steel and tundish bottom produced in steelmaking production. Decarburization, desulfurization and alloy fine-tuning are carried out through the AOD furnace to produce stainless steel products. [0003] In the prior art, this production process for smelting stainless steel has the following disadvantages: one is that the electric furnace mixes the chromium and nickel of the stainless steel mother liquor to the upper and middle limits of the finished product at one time, resulting in low-grade ferronickel in the electric furnace sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/068
CPCY02P10/20
Inventor 张迎春吴国忠王开
Owner ZHENSHI GROUP EASTERN SPECIAL STEEL
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