Titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging

A continuous casting nozzle and production method technology, applied in the field of steelmaking, can solve the problems that the spatter of the finished welding wire is difficult to control, cannot be significantly reduced, the titanium alloying process and the actual production control technology are unknown, and other problems, so as to reduce the nozzle nodule The effect of increasing the number of continuous pouring furnaces and reducing production costs

Inactive Publication Date: 2015-01-07
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When Shougang (200910076071.9) trial-manufactured Ti=0.08-0.17% welding wire steel, it used measures such as controlling the N and Al content in the steel to reduce the blockage of the nozzle. The content reaches 0.020-0.030%. Although a high-titanium alloy is used, it cannot significantly reduce the Al 2 o 3 type nodulation; secondly, it uses calcium treatment inclusion denaturation process, and the spatter of finished welding wire is difficult to control
In addition, Shougang (converter capacity 80 tons) adopts a large-capacity tundish, which is conducive to the floating and removal of inclusions containing titanium or aluminum. The control method has certain limitations for small-capacity converter and tundish production plants
Qinggang (Li Wenying, etc.) used low Al auxiliary materials and increased casting temperature to solve the Al problem of ER55-G titanium-containing welding wire steel. 2 o 3 Nodulation, but the relationship between Al, Ti, O, titanium alloying process and actual production control technology is not described in detail

Method used

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  • Titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging
  • Titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging
  • Titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging

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Experimental program
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Effect test

Embodiment 1

[0028] The method for producing titanium-containing welding wire steel for reducing nodule at a continuous casting nozzle comprises the following steps:

[0029] (1) Top-bottom double blowing converter smelting: low-sulfur molten iron and high-quality scrap steel are selected for blowing, and the sulfur content is S ≤ 0.030wt%. The control target of the converter end point is shown in Table 1. tail;

[0030] The tapping is made of low carbon and low phosphorus raw materials for alloying, and the deoxidizers are silicon aluminum barium and aluminum manganese titanium magnesium, which are added to the ladle along with the steel flow. The amount of deoxidizer added is shown in Table 1; Oxide and nitride inclusions are fully floated and excluded.

[0031] The top slag was pre-deoxidized with an aluminum-free deoxidizer, and the FeO+MnO content in the slag is shown in Table 1.

[0032] (2) LF furnace refining: the process control parameters are shown in Table 2, the LF refining s...

Embodiment 2-4

[0039] In Example 2-4, the steps are the same as in Example 1, and the process parameters are controlled as shown in Table 1-8.

[0040]

[0041] Table 1 End point of converter and deamination alloying control parameters (weight percentage, the same below)

[0042]

[0043] Table 2 LF refining process control parameters

[0044]

[0045] Table 3 LF furnace titanium alloying route

[0046]

[0047] Table 4 Technical parameters of low-aluminum and low-nitrogen 70Ti iron-clad wire

[0048]

[0049] Table 5 Control of refining slag composition

[0050]

[0051] Table 6 Continuous casting process control parameters and slab yield

[0052]

[0053] Note: The liquidus temperature is about 1512°C.

[0054] Covering agent chemical composition in Table 7, %

[0055]

[0056] Table 8 Composition of finished welding wire steel, %

[0057]

[0058] In Examples 1-5, there is basically no nodule formation on the nozzle of the tundish, and the thi...

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Abstract

The invention discloses a titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging and belongs to the technical field of steel making. The titanium-containing solder wire steel production method capable of alleviating the continuous casting nozzle clogging includes processing steps that (1) smelting in a top-bottom combined blowing converter, to be specific, using low-sulfur molten iron and high-quality waste steel to blow; (2) refining in an LF furnace; (3) performing titanium alloying in an LF furnace, to be specific, softly blowing molten steel for 10 minutes, and feeding low-aluminum low-nitrogen 70Ti iron-packaged core to the molten steel to perform the titanium alloying after finishing soft blowing; (4) protecting casting in the whole process. The titanium-containing solder wire steel production method capable of alleviating the continuous casting nozzle clogging is aimed to solve the continuous casting water feed nozzle and submerged nozzle clogging problem for the titanium-containing solder wire steel production; the titanium-containing solder wire steel production method capable of alleviating the continuous casting nozzle clogging alleviates the nozzle clogging degree through optimizing the steel making, refining and continuous casting techniques, improves the continuous casting furnace number and cast blank yield and effectively lowers the production cost.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for producing steel for titanium-containing welding wire that reduces nodules in continuous casting nozzles. Background technique [0002] Titanium-containing welding wire steel has excellent deposition and low spatter properties, and can meet the technical requirements of high-energy and high-efficiency welding. Compared with the same level of products alloyed with a large amount of nickel, molybdenum and other elements, titanium-containing alloy wire steel has obvious cost advantages, so it has been widely promoted and applied in the field of gas shielded welding of high-strength steel. However, due to factors such as poor castability of titanium-containing molten steel continuous casting, a large number of non-metallic inclusions with high melting points inside, and unstable product performance, the main products still rely on imports. [0003] Japan and other co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18C21C7/00C21C5/35C21C7/06
CPCB22D11/18C21C5/35C21C7/00C21C7/06Y02P10/20
Inventor 马德刚李双武么洪勇郝华强刘善喜项有兵高华军王强王欣
Owner HEBEI IRON AND STEEL
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