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Production method for reducing titanium content in high-carbon chromium bearing steel

A technology of high carbon chromium bearing steel and production method, which is applied in the field of production of low-alloy and high-strength steel plates, can solve the problems of low titaniumization without specific operation methods, etc., and achieve the effects of high Ti removal efficiency and simple operation.

Active Publication Date: 2012-03-21
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is only proposed that "the ladle refining furnace performs low-oxygen and low-titanium refining molten steel", but there is no specific operation method for low-titanium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) First, blow oxygen to molten steel in the 70t electric furnace EAF, impurity elements such as carbon C, phosphorus P, titanium Ti and other impurity elements brought into the molten iron oxide and scrap steel, when tapping steel: [C]0.32%, [P]0.005% , [Ti]0.0007%;

[0024] 2) Estimated steel output of electric furnace EAF is 70 tons. Calculated on the basis of 1.50% chromium element content required for bearing steel GCr15, the high-carbon ferrochromium alloy required for 60% Cr content is pre-loaded in the ladle, that is, 70000×1.50%×60 %÷55%=1145Kg, high carbon ferrochrome alloy contains 55% Cr element, 0.35% Ti element, baked at 1000℃ for 30min with the ladle;

[0025] 3) When the electric furnace eccentric furnace EBT is tapping, 20t of molten steel and all Ti-containing oxidized slag are left at the bottom of the furnace. When the molten steel is controlled to enter the ladle at 47t, 100KgSi-Fe, 300Kg high C-Mn-Fe, 56KgAl aluminum ingots are added, and then Add...

Embodiment 2

[0031] 1) First, oxygen is blown to molten steel in the 70t electric furnace EAF, impurity elements such as carbon C, phosphorus P, titanium Ti and other impurity elements brought into the oxidized iron and scrap steel, in the steel when tapping: [C]0.48%, [P]0.004% , [Ti]0.0003%;

[0032] 2) Estimated steel output of electric furnace EAF is 70 tons. Based on the calculation of 1.50% chromium element content required for bearing steel GCr15, the high-carbon ferrochrome alloy required for 75% Cr content is pre-loaded in the ladle, that is, 70000×1.50%×75 %÷60%=1310Kg, the high-carbon ferrochrome alloy contains 60% Cr element and 0.30% Ti element, baked at 1100℃ for 35min with the ladle;

[0033] 3) When the electric furnace eccentric furnace EBT is tapping, 20t of molten steel and all Ti-containing oxidized slag are left at the bottom of the furnace. When the molten steel is controlled to enter the ladle at 52t, 100KgSi-Fe, 300Kg high C-Mn-Fe, and 70KgAl aluminum ingots are ini...

Embodiment 3

[0039] 1) First, blow oxygen to molten steel in the 70t electric furnace EAF, impurity elements such as carbon C, phosphorus P, titanium Ti and other impurity elements brought into the molten iron oxide and scrap steel, when tapping the steel: [C]0.035%, [P]0.006% , [Ti]0.0002%;

[0040] 2) Estimated steel output of electric furnace EAF is 70 tons. Based on the calculation of 1.50% chromium element content required for bearing steel GCr15, the high-carbon ferrochromium alloy required for 65% Cr content is pre-loaded in the ladle, that is, 70000×1.50%×65 %÷60%=1240Kg, the high-carbon ferrochrome alloy contains 55% Cr element and 0.35% Ti element, baked with the ladle at 1070°C for 32min;

[0041] 3) 30t of molten steel and all Ti-containing oxidized slag are left at the bottom of the electric furnace eccentric furnace EBT. When the molten steel is controlled to enter the ladle at 52t, 100KgSi-Fe, 300Kg high C-Mn-Fe, 56KgAl ingots are added at the beginning, and then 700KgCaO, ...

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Abstract

The invention relates to a production method for reducing the titanium (Ti) content in high-carbon chromium (Cr) bearing steel. The production method comprises the following steps of: firstly, blowing oxygen into steel liquid in an electric furnace or a converter to remove Ti, pre-putting ferrochrome with Cr of 60 to 75 percent for smelting steel GCr15 into a steel ladle, and baking the steel ladle with the ferrochrome at the temperature of between 1,000 and 1,100 DEG C for 30 to 35 minutes; secondly, adding Si, Mn and Al for deoxygenation when the steel liquid enters 2 / 3 to 3 / 4 part of the steel ladle by using the characteristic of eccentric eriochrome black T (EBT) of the electric furnace, and then adding low-Ti and high-carbon ferrochrome; thirdly, blowing Ar and stirring during steel discharging, refining the steel liquid in a ladle furnace (LF) by adding the low-Ti ferrochrome, wherein the Ti content in the low-Ti ferrochrome is less than 0.12 percent; and finally, adjusting components of refined slag and adsorbing the Ti element in the steel liquid in a strengthening manner. The Ti content in the high-carbon Cr bearing steel prepared by using the method is 0.0016 to 0.0027 percent. The method is easy to operate, secure and high in Ti removing efficiency.

Description

technical field [0001] The invention belongs to the technical field of production of low-alloy high-strength steel plates, and mainly relates to a production method capable of reducing the content of titanium and Ti elements in high-carbon chromium bearing steel. Background technique [0002] High-carbon chromium bearing steel GCr15 is mainly used as an important material for manufacturing bearing rings and rolling elements. Now users have strict requirements on the internal metallurgical quality of bearing steel produced by metallurgical plants, such as inclusions and carbides, especially for large and medium-sized steel. The size, quantity and distribution of granular titanium nitride TiN are strictly required, because ①TiN inclusions destroy the continuity of the steel, and stress concentration is easy to occur under the condition of external deformation force; ②When the steel is deformed or heat treated, due to The thermal expansion coefficients of the metal matrix and T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C33/04
Inventor 陈庆丰钟成桢张贤忠杨凡熊玉彰邱文涛杜方许竹桃汪菊华余爱华陈华强张渊普黄海林张青山
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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