Nichrome steel alloy for smelting stainless steel and producing method thereof

A production method and technology for alloy steel, applied in the field of alloy steel, can solve the problems of high consumption of refractory materials, low production efficiency and high phosphorus content, and achieve the effects of high production efficiency, good quality and low impurity content

Inactive Publication Date: 2009-08-26
河南昌泰不锈钢板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of submerged arc furnace and electric furnace smelting are low production efficiency, high energy consumption, high phosphorus content in steel, and high consumption of refractory materials

Method used

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  • Nichrome steel alloy for smelting stainless steel and producing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one, the production method of nickel-chromium alloy steel

[0031] (1) Charge preparation:

[0032] Furnace charges are nickel-containing molten iron and nickel-containing iron block, expressed in weight percentage, nickel-containing molten iron is 84.4%, nickel-containing iron block is 15.6%, the charging amount of nickel-containing molten iron is 34.1 tons, nickel-containing iron block, that is, pig iron block, is 6.3 Ton.

[0033] The composition of molten iron is as follows:

[0034] Element C Si mn P S Cr Ni Cu content% 5.25 2.3 0.56 0.086 0.036 3.5 3.77 0.07

[0035] The composition of the nickel-containing iron block is the same as that of the nickel-containing molten iron.

[0036] (2) Oxygen supply: Oxygen top-blown converter is used for smelting, the oxygen pressure used is 0.8-0.9MPa, the oxygen pressure is controlled at 0.85MPa during oxygen supply, and the oxygen flow rate is 8700Nm 3 / h.

[0037] Gun p...

Embodiment 2

[0053] Embodiment two, basically the same as embodiment one, the difference is:

[0054] (1) charge: the nickel-containing molten iron is 80%, the nickel-containing iron block is 20%, the charging amount of the nickel-containing molten iron is 32 tons, and the nickel-containing iron block, that is, the pig iron block, is 8 tons.

[0055] The composition of molten iron is as follows:

[0056] Element C Si mn P S Cr Ni Cu content% 4.13 2.79 0.60 0.092 0.074 3..02 3.64 0.07

[0057] (2) Smelting

[0058] After blowing, the oxygen pressure is 0.80MPa, and the oxygen flow rate is 8600Nm 3 / h, the gun position is 1.2-2.4m, the first time is 7 minutes and 27 seconds, the temperature is 1419℃; the second time is 14 minutes and 10 seconds, the temperature is 1670℃; the third time is 18 minutes and 20 seconds, the temperature is 1710 ℃, the oxygen supply of the whole furnace is 2800m 3 .

[0059]The first batch of lime 3900kg (total 110kg / ton ...

Embodiment 3

[0066] Embodiment three, is basically the same as embodiment one, the difference is:

[0067] (1) Furnace charge: 78% of nickel-containing molten iron, 22% of nickel-containing iron block, the composition of molten iron is as follows:

[0068] Element C Si mn P S Cr Ni Cu content% 3.8 2.0 0.45 0.12 0.05 4.0 4.2 0.15

[0069] The composition of nickel-iron block is:

[0070] Element C Si mn P S Cr Ni Cu content% 4.3 2.6 0.34 0.15 0.06 3.7 4.6 0.10

[0071] (2) Smelting

[0072] After blowing, the oxygen pressure is 0.87MPa, and the oxygen flow rate is 8900Nm 3 / h, the gun position is 1.4m, the first time is 9 minutes and 30 seconds, the temperature is 1510°C; the second time is 15 minutes and 10 seconds, the temperature is 1700°C; the third time is 19 minutes and 10 seconds, the temperature is 1700°C, The oxygen supply of the whole furnace is 2900m 3 .

[0073] The first batch of lime 120kg / ton ...

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Abstract

The invention discloses nickel-chrome alloy steel used for smelting stainless steel, and the production method thereof. The nickel-chrome alloy steel comprises the following components: carbon is 0.3to 2.0, silicon is lower than or equal to 1.0, manganese is lower than or equal to 0.5, phosphorus is lower than or equal to 0.03, sulfur is lower than or equal to 0.04, chromium is 0.6 to 2.5, nickel is 3.5 to 7.0, copper is lower than or equal to 0.2, and the residual is iron. The production process comprises charging material preparation, oxygen supply, slag forming, end point control, deoxidization alloying and nitrogen flush processing, etc., charging material comprises nickel including molten iron and nickel including iron blocks, being expressed according the weight percentage, nickel including molten iron occupies 75 to 90 percent, the nickel including iron blocks occupy 10 to 25 percent; an oxygen top-blow converter is adopted to smelt, the double slag method is used to form the slag, the end point alkalinity is larger than 2.5, the carbon content C is larger than or equal to 0.30. The nickel-chrome alloy steel of the invention includes lower phosphorus and sulfur which can be directly used as raw materials for smelting the stainless steel, the output and the quality of the stainless steel can be improved, and the production cost is reduced.

Description

1. Technical field: [0001] The invention relates to an alloy steel, in particular to a nickel-chromium alloy steel used for smelting stainless steel and a production method thereof. 2. Background technology: [0002] With the increase of stainless steel market demand, in order to increase production and reduce costs, stainless steel manufacturers need a raw material for smelting stainless steel, which can be used for direct smelting stainless steel. This raw material is nickel-chromium alloy steel. The characteristic of nickel-chromium alloy steel is that the molten iron for smelting nickel-chromium alloy steel contains high metal nickel and chromium, and contains low phosphorus and sulfur. Therefore, nickel-chromium alloy steel is a very good raw material for smelting stainless steel, with high quality and low price , Low energy consumption during production. [0003] In the past, submerged arc furnaces were mainly used in the smelting of nickel-chromium alloys. Since 20...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/40C22C38/42C22C38/56C22C33/04C21C7/00B22D11/16C21C7/06
Inventor 马和平李振立
Owner 河南昌泰不锈钢板有限公司
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