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Method for smelting tire cord steel and method for continuously casting tire cord steel

A technology of cord steel and molten steel, applied in the field of smelting cord steel, which can solve the problems of increased content of inclusions and reduction of alloy yield, and achieve the effect of strong deformability of inclusions

Active Publication Date: 2013-04-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of the present invention, carrying out RH vacuum refining and then carrying out ladle furnace refining can solve the slag-gold reaction balance problem; meanwhile, adopting the operation of vacuum refining first, the oxygen in the steel reacts with carbon to generate CO gas, and The deoxidation of the LF refining process is mainly the alloy in the steel. The disadvantage is that it not only reduces the yield of the alloy, but also increases the content of inclusions in the steel due to the oxides generated by deoxidation; in addition, the vacuum refining is also conducive to deoxidation hydrogen

Method used

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  • Method for smelting tire cord steel and method for continuously casting tire cord steel
  • Method for smelting tire cord steel and method for continuously casting tire cord steel
  • Method for smelting tire cord steel and method for continuously casting tire cord steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This example is used to illustrate the smelting and continuous casting method of cord steel (P72LX steel).

[0072](1) Converter blowing

[0073] Add 120 tons of molten iron into the converter for top-bottom double-blowing converter blowing (top blowing oxygen 210 standard cubic meters per hour per ton of molten steel, bottom blowing protective gas with an intensity of 1.5 standard cubic meters per hour per ton of molten steel), blowing time For 20 minutes, the temperature of the molten steel at the end of blowing was 1640°C. Sampling was carried out for elemental composition analysis. The C content of the molten steel at the end of blowing was 0.08% by weight, the content of P was 0.003% by weight, and the content of S was 0.004% by weight. Content is 4×10 -4 weight%. After blowing in the converter, high magnesium lime with a magnesium oxide content of 35% by weight is added into the converter, and the dosage of the high magnesium lime is 6 kg / ton of molten steel.

...

Embodiment 2

[0084] This example is used to illustrate the smelting and continuous casting method of cord steel (P72LX steel).

[0085] Smelting cord steel and continuous casting cord steel according to the method of embodiment 1, the difference is:

[0086] In step (1), the main technological parameters of the primary refining of the converter are as shown in Table 1;

[0087] In step (2), in the tapping process, add anthracite recarburizer according to 5 kg / ton molten steel, then add ferrosilicon alloy (silicon content is 75% by weight, balance is iron) and 4.2 kg according to 2.2 kg / ton molten steel / ton of molten steel ferromanganese alloy (manganese content is 72% by weight, and the balance is iron) is alloyed with Si and Mn. Sampling was carried out for element composition analysis. After tapping, based on the total weight of molten steel, the contents of each component were [C]: 0.65% by weight, [Si]: 0.13% by weight, [Mn]: 0.43% by weight, [Al] : 0.004% by weight, the active oxy...

Embodiment 3

[0093] This example is used to illustrate the smelting and continuous casting method of cord steel (P72LX steel).

[0094] Smelting cord steel and continuous casting cord steel according to the method of embodiment 1, the difference is:

[0095] In step (1), the main technological parameters of the primary refining of the converter are as shown in Table 1;

[0096] In step (2), in the tapping process, add anthracite recarburizer according to 8 kg / ton molten steel, then add ferrosilicon alloy (silicon content is 75% by weight, balance is iron) and 4.5 kg according to 2.3 kg / ton molten steel / ton of molten steel ferromanganese alloy (manganese content is 72% by weight, and the balance is iron) is alloyed with Si and Mn. Sampling was carried out for element composition analysis. After tapping, based on the total weight of molten steel, the contents of each component were [C]: 0.67% by weight, [Si]: 0.14% by weight, [Mn]: 0.44% by weight, [Al] : 0.003% by weight, the active oxy...

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Abstract

The invention discloses a method for smelting tire cord steel and a method for continuously casting tire cord steel; the methods comprise the following steps of: (1), carrying out primary smelting on molten iron or semi-steel by converter top-bottom blowing, and tapping into a steel ladle without deoxidization; (2), carrying out recarburization and pre-alloying on the molten steel in the tapping process, so on the basis of the total weight of the molten steel, the activity oxygen content in the molten steel is 0.004-0.008wt%, the C content is 0.64-0.68wt% and the Al content is less than 0.4wt%; (3), blowing argon to the molten steel in the steel ladle after tapping, and carrying out vacuum refining and alloy fine adjustment; and (4), carrying out ladle furnace refining on the molten steel which is subjected to the vacuum refining by using the manner of bottom blowing argon, adding refining slags batch by batch and adding deoxidizing agents batch by batch, so the total content of FeO and MnO in the steel ladle top slag is less than or equal to 10wt%. In the methods, the tire cord steel is produced by using the technological process consisting of converter primary smelting, vacuum refining and steel ladle furnace refining and cogged ingot continuous casting pouring, and thus the clean production of tire cord steels is achieved.

Description

technical field [0001] The invention relates to a method for smelting cord steel and a method for continuously casting cord steel. Background technique [0002] As a reinforcing material, cord steel can greatly improve the strength and elasticity of rubber products, so it is widely used in industrial fields such as automobile tires and transmission belts. In recent years, domestic radial tires, especially all-steel radial tires, have experienced rapid growth, driving the rapid growth of steel cord production. At present, only a small number of domestic manufacturers can produce cord steel, and some joint venture factories that produce cord steel still rely heavily on imports for billets. Cord steel has very strict requirements on inclusions, especially oxide inclusions, and the nitrogen content should be as low as possible. It also puts forward higher requirements on the size and shape variability of inclusions. It is required that Al in the slab 2 o 3 Inclusions and non-...

Claims

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Application Information

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IPC IPC(8): C21C5/35C21C7/10C21C7/06B22D11/00
Inventor 张敏曾建华陈永王新华吴国荣李清春杨森祥曾耀先姜敏陈怀杰
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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