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Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese

A technology of molten steel and content, applied in the field of metallurgy, can solve the problems of difficult composition adjustment, long continuous casting pouring cycle, affecting slab quality, etc., and achieve the effects of shortening smelting time, improving production efficiency, and improving slab quality

Active Publication Date: 2014-12-03
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The current process generally used in the production of IF steel is: converter ~ RH ~ continuous casting. Usually, alloys (such as P, Si, Mn) are added to the molten steel in the RH furnace at one time and the composition is adjusted. Due to the limited capacity of the equipment, and A large amount of alloy needs to be added at one time, which makes the composition adjustment difficult and the cycle is long. The processing time in RH often exceeds 40 minutes, causing the refining process to become a restrictive link that restricts the entire production rhythm. The continuous casting pouring cycle is too long, which affects the slab quality

Method used

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  • Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese
  • Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese

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preparation example Construction

[0017] see figure 1 , the embodiment of the present invention provides a method for preparing IF steel containing phosphorus, silicon and manganese, comprising:

[0018] Step 10, performing pre-desulfurization and slagging treatment on the molten iron in sequence to obtain the first molten iron with a sulfur content≤0.001%. It specifically includes: Step 101, pre-desulfurize the iron ladle containing molten iron at the desulfurization station through KR stirring; molten iron, and prevent the sulfur in the slag from returning to the first molten iron.

[0019] Step 20, smelting the first molten iron through a dephosphorization converter to obtain semi-liquid steel with a C content ≥ 3.0% and a temperature T ≥ 1300°C. It specifically includes: step 201, mixing the first molten iron after pre-desulfurization treatment into the dephosphorization converter, and adding scrap steel accounting for 5% to 15% of the weight of the first molten iron into the dephosphorization converter;...

Embodiment 1

[0027] Bake-hardening steel CR180BH is produced by using the preparation method of phosphorus-containing silicon-manganese-containing IF steel provided in the embodiment of the present invention. The conditions of molten steel entering the RH furnace are C content 0.031%; Si content 0.005%; S content 0.007%; P content 0.031%; Mn content 0.02%; temperature 1625°C; oxygen content 650ppm.

[0028] The temperature and oxygen content are suitable, and no oxygen blowing or scrap addition is required. After treatment for 3 minutes, add ferrophosphorus and ferromanganese according to the target P content of 0.036% and target Mn content of 0.35%. 4 minutes after the alloy was adjusted, samples were taken to analyze the P and Mn content; the P content was 0.037% and the Mn content was 0.31%; RH was treated for 15 minutes, and the oxygen value was 425ppm; Add aluminum grains, and finally transfer 13Kg of boron-iron alloy. 21 minutes when the adjustment is completed.

[0029] After the...

Embodiment 2

[0035] Production of bake-hardening steel CR180BH by using the preparation method of phosphorus-containing, silicon-, and manganese-containing IF steel provided by the embodiment of the present invention: the conditions for entering the molten steel in the RH furnace are: C content 0.028%; Si content 0.004%; S content 0.009%; P content 0.073% ; Mn content 0.02%; temperature 1634 ° C; oxygen content 681ppm.

[0036] The temperature and oxygen content are suitable, and no oxygen blowing or scrap addition is required. After 3 minutes of treatment, ferrophosphorus and ferromanganese were added according to the target P content of 0.081% and target Mn content of 0.35%. 4 minutes after the alloy was adjusted, samples were taken to analyze the P and Mn content; the P content was 0.080% and the Mn content was 0.28%; the RH treatment was 15 minutes, and the oxygen value was 463ppm; Add aluminum particles, and finally transfer 13Kg of ferroboron alloy and 3.0t of ferrosilicon alloy. 2...

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Abstract

The invention relates to the technical field of metallurgy, and in particular relates to a preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese. The preparation method comprises the following steps: sequentially performing predesulfurization and slagging-off treatment on molten iron to obtain first molten iron; performing dephosphorization converter smelting on the first molten iron to obtain semi molten steel; performing decarbonization furnace smelting on the semi molten steel to obtain first molten steel, or, performing conventional converter smelting on the first molten iron to obtain the first molten steel; performing temperature adjustment and decarbonization on the first molten steel by virtue of an RH (Ruhrstahl-Heraus) furnace, and introducing ferrophosphorus and micro carbon ferromanganese; then supplementing ferrophosphorus and micro carbon ferromanganese into the first molten steel, adding a ferro-silicon alloy at the same time, and adjusting components of the first molten steel to obtain second molten steel with qualified carbon content and silicon-manganese-phosphorus content; transferring the second molten steel to a continuous casting process and pouring into a middle ladle, and casting the second molten steel to obtain an IF steel plate slab. The preparation method of the IF steel containing phosphorus, silicon and manganese, disclosed by the invention, can be used for reducing the time and load for adjusting the components, shortening the smelting time in the RH furnace and increasing the production efficiency and the plate slab quality.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing IF steel containing phosphorus, silicon and manganese. Background technique [0002] With the trend of high-strength automotive panels, more and more IF steels require the addition of P, Si, Mn and other elements for strengthening. Most of these alloying elements need to be adjusted in the RH furnace. The current process generally used in the production of IF steel is: converter ~ RH ~ continuous casting. Usually, alloys (such as P, Si, Mn) are added to the molten steel in the RH furnace at one time and the composition is adjusted. Due to the limited capacity of the equipment, and A large amount of alloy needs to be added at one time, which makes the composition adjustment difficult and the cycle is long. The processing time in RH often exceeds 40 minutes, causing the refining process to become a restrictive link that restricts the entire production rhyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/04
Inventor 陈玉鑫刘建华王莉赵长亮乔焕山许东利王保生黄俊王朝斌黄财德罗磊宋佳友周伟
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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