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Method for AOD whole melted iron directly smelting austenitic stainless steel

A technology of austenitic stainless steel and full molten iron, which is applied in the field of stainless steel smelting technology, can solve the problems of high content of trace impurity elements in stainless steel, large area occupied by production equipment, high power consumption of stainless steel mother liquor, etc., achieve cost advantages, reduce difficulty, electrode Wait for the effect of considerable consumption

Inactive Publication Date: 2009-07-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 1) Due to the high power consumption of smelting stainless steel mother liquor with electric furnace, the power consumption per ton of steel is 320-360kwh, which increases the production cost accordingly;
[0017] 2) After 7-10 days of production, the electric furnace must be shut down for maintenance of refractory materials, and production needs to be shut down for 10-24 hours, so that the entire stainless steel production line has to be shut down for 10-24 hours, and the production capacity is greatly affected;
[0018] 3) Due to the need to use scrap steel in the initial smelting process, the content of trace impurity elements in the smelted stainless steel is relatively high;
[0019] 4) The process route is long and the production equipment occupies a large area

Method used

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  • Method for AOD whole melted iron directly smelting austenitic stainless steel
  • Method for AOD whole melted iron directly smelting austenitic stainless steel
  • Method for AOD whole melted iron directly smelting austenitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Hot metal conditions:

[0049] Hot metal composition: C 2.98%, Mn 0.03%, Si 0.00%, S 0.028%, P 0.010%;

[0050] Hot metal temperature: 1224°C, hot metal weight: 91 tons;

[0051] blowing process:

[0052] At the beginning of blowing, add Si-Fe 15kg / t, graphite (coke) 40kg / t and heat up;

[0053] In the first stage, 90% of the total amount of nickel, about 70kg / t of metallic nickel, is added.

[0054] When the cumulative oxygen supply reaches 4500Nm 3 When , the first stage ends; the measured temperature is 1600°C.

[0055] The composition of molten steel at the end of the first stage is shown in Table 1-1:

[0056] Table 1-1

[0057]

[0058] From the second stage, 34,000 kg of ferrochromium alloy is continuously added at a rate of 2 tons / minute, and the starting temperature of the input is 1680°C.

[0059] At the end of the main blowing of stage 2, C was measured to be 0.45 wt%.

[0060] The composition of molten steel at the end of dynamic 3 in the second s...

Embodiment 2

[0075] Hot metal conditions:

[0076] Hot metal composition: C 2.91%, Mn 0.03%, Si 0.00%, S 0.0321%, P 0.006%;

[0077] Hot metal temperature: 1243°C, hot metal weight: 86.6 tons;

[0078] blowing process:

[0079] At the beginning of blowing, add Si-Fe 30kg / t, graphite (coke) 20kg / t and heat up;

[0080] In the first stage, 95% of the total amount of nickel, about 76kg / t of metallic nickel, is added.

[0081] Cumulative oxygen supply up to 5000Nm 3 Phase 1 ended; temperature 1700°C.

[0082] At the end of the main blowing of the second stage, C was measured to be 0.56 wt%.

[0083] The composition of molten steel at the end of dynamic 3 in the second stage is shown in Table 2-1:

[0084] table 2-1

[0085]

[0086] From the second stage, 31,000 kg of ferrochrome alloy was continuously added at a rate of 2.3 tons / minute, and the starting temperature of the input was 1700°C.

[0087] The composition of molten steel at the end of the second stage of decarburization is...

Embodiment 3

[0103] Hot metal conditions:

[0104] Composition of molten iron: Composition of molten iron: C 2.83%, Mn 0.03%, Si 0.00%, S 0.010%, P0.007%;

[0105] Hot metal temperature: 1154°C, hot metal weight: 85 tons

[0106] Embodiment 3 blowing process:

[0107] At the beginning of blowing, add Si-Fe 20kg / t, graphite (coke) 30kg / t and heat up;

[0108] In the first stage, 100% of the total amount of nickel, about 85kg / t of metallic nickel, is added.

[0109] Cumulative oxygen supply up to 5500Nm 3 Phase 1 ended; temperature 1668°C.

[0110] At the end of the main blowing of stage 2, C was measured to be 0.65 wt%.

[0111] The composition of molten steel at the end of dynamic 3 in the second stage is shown in Table 3-1:

[0112] Table 3-1

[0113]

[0114] From the second stage, 32,400 kg of ferrochrome alloy was continuously added at a rate of 3 tons / minute, and the input temperature was 1720°C.

[0115] The composition of molten steel at the end of the second stage of dec...

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Abstract

The invention discloses a smelting method of austenite stainless steel through AOD full-molten iron directly, which comprises the following steps: putting 15-30Kg / t steel ferrosilicon and 20-40Kg / t steel graphite or char into the furnace at the beginning of converting; heating the molten pool temperature to 1600-1700 deg. c; using top-blowing oxygen gun and side blow vent to supply oxygen; controlling the oxygen flow and inert gas flow over 10: 1; adding the nickel over 90% in the stage; finishing the course when the [C] is 1.5-2.5wt%; entering the decarburizing chromine-keeping stage and reducing desulfurizing stage.

Description

technical field [0001] The invention relates to the field of stainless steel smelting technology, more specifically, relates to a method for directly smelting austenitic stainless steel with AOD full molten iron. Background technique [0002] At present, the process steps of the common AOD furnace (argon oxygen decarburization furnace) stainless steel smelting process in the world are: [0003] Smelting of dephosphorized hot metal and steel scrap in electric furnace → stainless steel refining in AOD furnace → vacuum decarburization in VOD (vacuum decarburization furnace) furnace, or in LF / LTS (ladle furnace / ladle treatment station) Process → continuous casting. [0004] In the above process, the existing AOD furnace is mainly used for stainless steel refining. The raw material is stainless steel mother liquor smelted by melting scrap steel and alloy in an electric furnace, and argon is used as a dilution gas to reduce Pco and decarburize and preserve chromium in molten stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072
Inventor 池和冰江庆元邵世杰李冬刚蒋兴元
Owner BAOSHAN IRON & STEEL CO LTD