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Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron

A technology of high-phosphorus nickel and stainless steel, applied in the field of manufacturing stainless steel, can solve problems such as increasing costs, achieve the effect of reducing manufacturing costs and expanding the field of use

Inactive Publication Date: 2010-05-12
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical solution disclosed in this patent application needs to add more dephosphorization agents, which will increase the cost of smelting high-phosphorus nickel-chromium pig iron to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1, the production process of dephosphorizing high-phosphorus nickel-chromium pig iron and smelting stainless steel by using an electric furnace

[0034] 1. The main components of the high-phosphorus nickel-chromium pig iron loaded into the electric furnace are shown in Table 1.

[0035] Table 1: (percentage by weight)

[0036] Element

C

Si

Cr

Ni

S

P

content

3.22％

2.65％

2.85％

5.09％

0.082％

0.078％

[0037] 2. One charge of the electric furnace: 60 tons of high-phosphorus nickel-chromium pig iron, 9 tons of general carbon steel; at the same time, 7146Kg of quicklime is put into the furnace through the high-level silo in batches.

[0038] 3. In order to dephosphorize, the primary material of the electric furnace is energized from the low gear 7 to 3987KWh, and then switched to the high gear 15 to energize to 7986KWh, then back to the 7th gear to energize to 18677KWh, and then stop energ...

Embodiment 2

[0050] Example 2, the production process of dephosphorizing high-phosphorus nickel-chromium pig iron and smelting stainless steel by using an electric furnace

[0051] 1. The main components of the high-phosphorus nickel-chromium pig iron loaded into the electric furnace are shown in Table 3.

[0052] Table 3: (percentage by weight)

[0053] Element

C

Si

Cr

Ni

S

P

content

3.15％

2.32％

2.22％

7.55％

0.172％

0.062％

[0054] 2. One charge of the electric furnace: 60 tons of high-phosphorus nickel-chromium pig iron, 8.5 tons of general carbon steel, and 5533Kg of quicklime into the furnace through the high-level silo in batches.

[0055] 3. In order to dephosphorize, the primary material of the electric furnace is energized from the low gear 7 to energize 5463KWh, then switch to the high gear 15 gear to energize to 18930KWh, and then return to the 7th gear to energize to 18554KWh, and then stop the power...

Embodiment 3

[0067] Example 3, the production process of dephosphorizing high-phosphorus nickel-chromium pig iron and smelting stainless steel by using an electric furnace

[0068] 1. The main components of the high-phosphorus nickel-chromium pig iron loaded into the electric furnace are shown in Table 5.

[0069] Table 5: (percentage by weight)

[0070] Element

C

Si

Cr

Ni

S

P

content

2.62％

2.93％

2.11％

8.84％

0.103％

0.057％

[0071] 2. One charge of electric furnace: 60 tons of high-phosphorus nickel-chromium pig iron, 8 tons of general carbon steel.

[0072] 3. In order to dephosphorize, the primary material of the electric furnace is energized from the low gear 7 to energize 5802KWh, then switch to the high gear 15 gear to energize to 17943KWh, and then return to the 7th gear to energize to 18019KWh and stop energizing.

[0073] 4. When the energization reaches about 11000KWh, start to use the furnace door o...

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PUM

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Abstract

The invention relates to a process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron, which comprises the steps of charging, electrification, oxygen blowing, flushing, refining and the like. By the process provided by the invention, high-phosphorus nickel-chromium pig iron is dephosphorized in an electric furnace, stainless steel is produced by smelting, the high-phosphorus nickel-chromium pig iron with low cost is adopted as a raw material, the manufacturing cost of each ton of stainless steel can be lowered by about 200 dollars, the use field of the raw material of the stainless steel can also be further expanded, and the nickel-chromium pig iron with high phosphorus content can be applied to the smelting production of the stainless steel in a large scale.

Description

technical field [0001] The invention relates to a process method for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron as raw material and utilizing dephosphorization technology to reduce phosphorus content. Background technique [0002] The traditional stainless steel manufacturing process is to use stainless steel scrap, Ni alloy, Cr alloy, etc. to melt into molten steel in the electric furnace to remove impurities and adjust the composition in the refining furnace, or to use the raw material mode of blast furnace molten iron plus alloy for smelting. [0003] However, as the price of Ni continues to rise, a new smelting raw material nickel-chromium pig iron has appeared in the Chinese market, which can partially replace pure nickel, ferronickel or scrap stainless steel as the source of nickel for nickel-containing stainless steel, so as to reduce the cost of raw materials for making stainless steel. However, due to the high phosphorus content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C22C37/10
CPCY02P10/20
Inventor 徐钟显金容焕申忠容黄锦锋金将杰金雄杰
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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