A method for controlling surface cracks of welding wire steel continuous casting slab

A surface crack and welding wire steel technology, which is applied in the field of iron and steel metallurgy, can solve problems such as micro-cracks, and achieve the effects of avoiding surface micro-cracks, reducing the amount of grinding, and optimizing the amount of cooling water

Active Publication Date: 2021-07-20
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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  • A method for controlling surface cracks of welding wire steel continuous casting slab
  • A method for controlling surface cracks of welding wire steel continuous casting slab
  • A method for controlling surface cracks of welding wire steel continuous casting slab

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 iron and steel metallurgy, in particular to a method for controlling surface cracks of welding wire steel continuous casting slabs. It specifically includes the following key process steps: 1) Pretreatment of molten iron, 2) Converter treatment has two operation modes, 3) Special ferrosilicon 10kg / ton steel is used for the alloy, 8kg / ton steel of low-phosphorus manganese ferroalloy is used with metal manganese, 4) Refining Treatment process: The temperature of the LF furnace is required to be above 1560°C. The LF furnace adjusts the addition of lime and ferro-titanium according to the S and Ti content of the furnace, and raises the temperature to 1580-1600°C at one time, and the basicity of the top slag is controlled at 1.8-2.4 ;5) Ensure that the treatment period is ≥ 30min, and the stirring period is at least 2-3min; 6) After the refining treatment is completed, the machine is poured after weak blowing for 3‑5min; 7) The amount of secondary cooling water is optimized. The shell of the invention effectively controls TiN inclusions, avoids flocculation of molten steel, and controls microcracks on the surface of casting slabs.

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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Patent Type & Authority Patents(China)
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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