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Production of low-phosphor electroslag melt steel

A technology of electroslag remelting steel and a production method, which is applied in the field of iron and steel smelting technology, can solve the problems of high liquid slag temperature, poor dephosphorization effect, and poor dephosphorization ability, so as to reduce the content of silicomanganese and improve the purity , The effect of SiMn reduction

Active Publication Date: 2013-03-13
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Production practice shows that the above-mentioned slag system usually adopts high-temperature slag liquid, which has a good desulfurization effect; but it can only desulfurize and purify molten steel, but cannot dephosphorize; (2) Poor dephosphorization ability of slag system
[0005] The electroslag redissolution dephosphorization method of steel mostly uses CaO-CaF 2 -FeO or add BaO or BaCO to the above binary and ternary slag systems 3 , BaCl 2 , FeO, etc., but the dephosphorization effect is not good

Method used

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  • Production of low-phosphor electroslag melt steel

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0063] Example 1. De-[P] process test of pure iron

[0064] 1. Raw materials: electric furnace or electric furnace + metal electrode rod refined and poured outside the furnace.

[0065] 1.1 Electrode Rod Chemical Composition (%)

[0066] C 0.287, Mn 0.02, Si 0.01, S 0.007, P 0.003

[0067] 1.2 Electrode size: Φ200 mm, weight 600 kg, 2 pieces.

[0068] 1.3 Bottom pad: use the same steel type bottom pad, the size of the bottom pad is Φ300×20mm.

[0069] 1.4 Arc starter: carbon electrode 300g.

[0070] 2. Electroslag remelting process

[0071] 2.1 Slag system

[0072] CaO:CaF 2 =15%:85%

[0073] Slag amount: 50 kg

[0074] Current: 6000~6500A, Voltage: 58V

[0075] 2.2 Crystallizer size: Φ400mm

[0076] 3. Electroslag steel ingot

[0077] 3.1 Chemical composition of electroslag steel ingot (%)

[0078] C 0.095, Mn 0.015, Si 0.01, S 0.003, P 0.001

[0079] 3.2 Ingot size: Φ400mm×1.2m; Weight: 1200kg

[0080] 4. Remove [P] effect:

[0081] Remove [P] rate = ([P] befo...

example 2

[0083] Example 2. De-[P] process test of low carbon steel

[0084] 1. Raw materials: electrode rods poured in vacuum induction furnace.

[0085] 1.1 Electrode Rod Chemical Composition (%)

[0086] C 0.17, Mn 0.03, Si 0.03, S 0.007, P 0.003

[0087] 1.2 Size: Φ80 mm, weight 70 kg, 3 pieces.

[0088] 1.3 Bottom pad: use the same steel type bottom pad, the size of the bottom pad is Φ130×15 mm.

[0089] 1.4 Arc starter: carbon electrode 100g.

[0090] 2 Electroslag remelting process

[0091] 2.1 Slag system

[0092] CaO:CaF 2 =20%:80%

[0093] Slag amount: 10 kg

[0094] Current: 2500~3000A, Voltage: 54-56V

[0095] 2.2 Crystallizer size: Φ165 mm

[0096] 3 electroslag steel ingot

[0097] 3.1 Chemical composition of electroslag steel ingot (%)

[0098] C 0.135, Mn 0.03, Si 0.01, S 0.001, P 0.001

[0099] 3.2 Ingot size: Φ165mm×1.2m; weight: 200kg

[0100] 4 off [P] effect

[0101] Remove [P] rate = ([P] before - [P] after) / [P] before × 100%

[0102] =(0.003%-0.0...

example 3

[0103] Example 3. De-[P] process test of ultra-low carbon high-purity iron

[0104] 1. Raw materials: electric furnace or electric furnace + metal electrode rod refined and poured outside the furnace.

[0105] 1.1 Electrode Rod Chemical Composition (%)

[0106] C 0.008, Mn 0.06, Si 0.04, S 0.002, P 0.006

[0107] 1.2 Size: Φ250 mm, weight 560 kg, 2 pieces.

[0108] 1.3 Bottom pad: use the same steel type bottom pad, the size of the bottom pad is Φ300×20 mm.

[0109] 1.4 Arc starter: carbon electrode 300g.

[0110] 2. Electroslag remelting process

[0111] 2.1 Slag system

[0112] CaO:CaF 2 =25%:75%

[0113] Slag volume: 52 kg

[0114] Current: 5500~6000A, Voltage: 57~60V

[0115] 2.2 Crystallizer size: Φ400 mm

[0116] 3. Electroslag steel ingot

[0117] 3.1 Chemical composition of electroslag steel ingot (%)

[0118] C 0.006, Mn 0.02, Si 0.02, S<0.001, P 0.002

[0119] 3.2 Ingot size: Φ400mm×1.3m; weight: 1100kg

[0120] 4. Remove [P] effect

[0121] Remove [P]...

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Abstract

Production of low-phosphorus electro-slag re-melting steel is carried out by preparing for metal electrode, false electrode, slag containing fluorite, activated lime and arc-striking agent in proportion of CaF2:TiO2=1:1-2 or carbon electrode, striking while slagging by metal electrode, raising current for 5-15mins, re-melting, proportioning with CaO:CaF2=15-25%:75-85%, smelting, controlling current and voltage and slow-cooling. It has less harmful element contents and ferro-silico content, better steel-liquid purity and performance.

Description

technical field [0001] The invention belongs to iron and steel smelting technology, in particular to a production method of electroslag remelting slag steel. Background technique [0002] We all know that to make "good steel", you must make "good slag". Slag is an important link in the steelmaking process, which is used to reduce the content of harmful elements such as S and P in steel, purify molten steel, and improve the quality of steel. Electroslag remelting is a common iron and steel smelting technology, which is used for the production of high-standard (high-performance) steel. (crude steel), undergo electroslag remelting, and smelt into electroslag (electroslag remelting) steel ingots. [0003] As cutting-edge technology has higher and higher requirements on the performance of steel, the control of harmful elements [S] and [P] in steel is becoming more and more stringent. At present, the slag commonly used in the electroslag remelting technology in the metallurgical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/54C22B9/18
Inventor 张景海王华童英豪郝锡秀赵肃武陈新建王治政张莹
Owner 宝武特种冶金有限公司