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Method for controlling surface cracks of welding wire steel continuous casting blank

A technology for surface cracks and continuous casting slabs, which is applied in the field of controlling the surface cracks of welding wire steel continuous casting slabs. It can solve the problems of micro-cracks and other problems, and achieve the effects of avoiding surface micro-cracks, avoiding flocculation, and optimizing cooling water volume.

Active Publication Date: 2019-11-12
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the slab is prone to micro-cracks, and the reason for the cracks is the slag entrainment caused by the fluctuation of the liquid level caused by the flocculation through sampling and analysis of the cracks after rolling

Method used

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  • Method for controlling surface cracks of welding wire steel continuous casting blank
  • Method for controlling surface cracks of welding wire steel continuous casting blank
  • Method for controlling surface cracks of welding wire steel continuous casting blank

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Taking AER70S-G high-titanium welding wire steel as an example, the present invention takes the following measures to realize the control of cracks on the surface of continuous casting slabs of high-titanium welding wire steel. In this embodiment, a high-titanium welding wire steel, its constituent elements and their element quality The percentage content is shown in Table 1 below. This embodiment contains C, Si, Mn, P, S, Ti and N, and the balance is iron and unavoidable impurities.

[0033] Table 1. Main chemical composition control of high titanium welding wire steel in embodiment 1

[0034]

[0035]A method for controlling surface cracks of welding wire steel continuous casting slabs, comprising the following steps:

[0036] 1. Process route: hot metal pretreatment → converter smelting → furnace refining (LF) → billet continuous casting (electromagnetic stirring) → inspection → large-scale factory.

[0037] 2. Pretreatment of molten iron: S selection of 0.0289% ...

Embodiment 2

[0049] This embodiment is basically the same as the previous embodiment, and the special feature is that refining and adding wollastonite to control the sulfur in the molten steel. The present invention takes the following measures to realize the control of surface cracks of the high-titanium welding wire steel continuous casting slab,

[0050] In this embodiment, a high-titanium welding wire steel, its constituent elements and their element mass percentage content are shown in Table 1 below. This embodiment contains C, Si, Mn, P, S, Ti and N, and the balance is iron and unavoidable impurities.

[0051] Table 2. Control of Main Chemical Composition of High Titanium Welding Wire Steel in Example 2

[0052]

[0053] A method for controlling surface cracks of welding wire steel continuous casting slabs, comprising the following steps:

[0054] 1. Process route: hot metal pretreatment → converter smelting → furnace refining (LF) → billet continuous casting (electromagnetic sti...

Embodiment 3

[0067] This embodiment is basically the same as the previous embodiment. The special feature is that the converter is smelted by double slag method, which not only ensures the carbon content, but also avoids high nitrogen in molten steel caused by long-term point blowing. The present invention adopts the following measures to achieve high control. Titanium welding wire steel continuous casting slab surface cracks,

[0068] In this embodiment, a high-titanium welding wire steel, its constituent elements and their element mass percentage content are shown in Table 1 below. This embodiment contains C, Si, Mn, P, S, Ti and N, and the balance is iron and unavoidable impurities.

[0069] Table 3. Control of Main Chemical Composition of High Titanium Welding Wire Steel in Example 3

[0070]

[0071] A method for controlling surface cracks of welding wire steel continuous casting slabs, comprising the following steps:

[0072] 1. Process route: hot metal pretreatment → converter ...

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Abstract

The invention relates to the technical field of ferrous metallurgy, particular to a method for controlling surface cracks of a welding wire steel continuous casting blank. The method specifically comprises the following key process steps that (1) molten iron pretreatment is carried out; (2) converter treatment has two operation manners; (3) special silicon iron of 10 kg / ton of steel is used by analloy, and a low-phosphorous manganese iron alloy of 8 kg / ton of steel is used in cooperation with metal manganese; (4) the refining treatment process is carried out, the temperature of entering an LFfurnace is required to be 1560 DEG C or above, the LF furnace adjusts the adding quantity of lime and the adding quantity of ferrotitanium according to the contents of S and Ti entering the furnace,the temperature is increased to 1580-1600 DEG C at a time, and the top slag ferrotitanium is controlled to range from 1.8 to 2.4; (5) it is guaranteed that the treatment period is larger than or equalto 30 min, and the stirring period is at least 2-3 min; (6) after refining treatment is finished, feed casting is carried out after weak blowing is carried out for 3-5 min; and (7) the secondary cooling water quantity is optimized. According to the method, TiN inclusions are effectively controlled, molten steel flocculant flow is avoided, and surface micocracks of the casting blank are controlled.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for controlling surface cracks of welding wire steel continuous casting slabs. Background technique [0002] Welding wire is used as a filler metal or as a wire welding material for electrical conductivity. In gas welding and gas tungsten arc welding, the welding wire is used as filler metal; in submerged arc welding, electroslag welding and other MIG arc welding, the welding wire is both filler metal and conductive electrode. [0003] Alloy welding wire steel ER70S-G is low-carbon, high-silicon, high-manganese, and high-titanium gas-shielded welding wire steel. It has strict requirements on P, residual components, and nitrogen content. floc. The surface of the slab is prone to micro-cracks, and the reason for the cracks is the slag entrapment caused by the fluctuation of the liquid level caused by the flocculation through sampling and analysis of the...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/30C21C7/00B22D11/22C22C38/14C22C38/06C22C38/04C22C38/02C22C33/06
CPCB22D11/225C21C5/28C21C5/30C21C7/00C21C7/0037C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 李旭赵帅李泽林潘瑞宝陶功捷李泊王宁
Owner ANGANG STEEL CO LTD
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