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A kind of smelting method of non-quenched and tempered steel

A smelting method and technology of non-quenched and tempered steel, which is applied in the field of metallurgy, and can solve problems such as secondary oxidation of molten steel, affecting the fluidity of molten steel in the continuous casting process, and the purity of molten steel

Active Publication Date: 2021-04-20
石钢京诚装备技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not properly controlled, it will easily lead to serious secondary oxidation of molten steel and generate a large amount of Al 2 o 3 , which seriously affects the fluidity and purity of molten steel in the continuous casting process

Method used

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  • A kind of smelting method of non-quenched and tempered steel
  • A kind of smelting method of non-quenched and tempered steel
  • A kind of smelting method of non-quenched and tempered steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition and mass percentage of the non-quenched and tempered steel in this example are shown in Table 1. The smelting method includes converter smelting, LF refining, VD vacuum treatment, and continuous casting process. The specific process steps are as follows:

[0025] (1) Converter smelting: Nitrogen is blown at the bottom during the whole process of converter smelting, and the nitrogen consumption is 25Nm 3 / t steel; converter high-draw carbon tapping, tapping C: 0.10%, to avoid molten steel over-oxidation, steel core aluminum 2.7kg / t steel, silicon-manganese alloy 17kg / t steel, ferrosilicon 2.5kg / t steel are added in sequence during the tapping process / t steel, white ash 5.4㎏ / t steel, refining slag 4.3㎏ / t steel, slag is strictly prohibited during the tapping process, and aluminum wire is fed 0.56㎏ / t steel after tapping;

[0026] Lime is high-quality refined lime, its composition and performance indicators are: CaO: 92%, MgO: 4.7%, SiO 2 : 1.6%, S...

Embodiment 2

[0033] The chemical composition and mass percentage of the non-quenched and tempered steel in this example are shown in Table 1. The smelting method includes converter smelting, LF refining, VD vacuum treatment, and continuous casting process. The specific process steps are as follows:

[0034] (1) Converter smelting: Nitrogen is blown at the bottom during the whole process of converter smelting, and the nitrogen consumption is 27Nm 3 / t steel; converter high-draw carbon tapping, tapping C: 0.09%, to avoid molten steel peroxidation, steel core aluminum 2.2㎏ / t steel, silicon-manganese alloy 16.5㎏ / t steel, ferrosilicon 1.8㎏ are added in sequence during the tapping process / t steel, white ash 5.7㎏ / t steel, refining slag 4.7㎏ / t steel, slag is strictly prohibited during the tapping process, and aluminum wire is fed 0.63㎏ / t steel after tapping;

[0035] The lime is high-quality refined lime, and its composition and performance indicators are: CaO: 91%, MgO: 4.2%, SiO 2 : 1.9%, S: 0...

Embodiment 3

[0042] The chemical composition and mass percentage of the non-quenched and tempered steel in this example are shown in Table 1. The smelting method includes converter smelting, LF refining, VD vacuum treatment, and continuous casting process. The specific process steps are as follows:

[0043] (1) Converter smelting: Nitrogen is blown at the bottom during the whole process of converter smelting, and the nitrogen consumption is 24Nm 3 / t steel; converter high-draw carbon tapping, tapping C: 0.085%, to avoid molten steel overoxidation, steel core aluminum 2.4kg / t steel, silicon-manganese alloy 17.5kg / t steel, ferrosilicon 1.2kg are added in sequence during tapping / t steel, white ash 5.9㎏ / t steel, refining slag 4.8㎏ / t steel, slag is strictly prohibited during the tapping process, and aluminum wire is fed 0.65㎏ / t steel after tapping;

[0044] The lime is high-quality refined lime, its composition and performance indicators are: CaO: 91.5%, MgO: 4.4%, SiO 2 : 1.5%, S: 0.026%, ig...

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Abstract

The invention discloses a non-quenched and tempered steel smelting method. The smelting method includes converter smelting, LF refining, VD vacuum treatment and continuous casting process. The specific process steps are as follows: (1) Bottom blowing nitrogen in the whole process of converter smelting (2) Diffusion deoxidation is carried out in the LF refining process to ensure good deoxidation and desulfurization effects. The N content of molten steel at the end of LF is 75-90ppm; (3) VD vacuum treatment, and the N content of molten steel after breaking the void is 50 ‑60ppm, soft blowing time ≥ 30min after air breaking, argon flow ≤ 25L / min; (4) Continuous casting adopts mold stirring and end stirring, using medium-high carbon tundish covering agent and medium-carbon mold slag, continuous casting The blank is slowly cooled off the assembly line. The smelting method of the non-quenched and tempered steel of the present invention has a stable nitrogen content yield, and the performance of the non-quenched and tempered steel is good; no calcium cyanamide (CaCN 2 ), less environmental pollution; less manganese nitride line feed, low production costs.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting non-quenched and tempered steel. Background technique [0002] In the 1970s, Thyssen Special Steel Company of Germany successfully developed non-quenched and tempered steel, and the typical steel grade is 49MnVS3. Non-quenched and tempered steel is to add a small amount of microalloying elements (mainly V, Nb, Ti, mainly V) to medium carbon steel, and rely on the precipitation of fine carbonitrides to strengthen the ferrite-pearlite structure, thereby Reach the strength level required by traditional quenched and tempered steel. [0003] Non-quenched and tempered steel has good cutting performance, and at the same time cancels the adjustment heat treatment, which can simplify the technological process of material processing, reduce energy consumption and improve material utilization. Compared with quenched and tempered steel, non-quenched and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/00C21C7/06C21C7/064C21C7/10C22C22/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C22C38/58B22D11/111B22D11/114C21C5/34
CPCB22D11/111B22D11/114C21C5/34C21C7/0006C21C7/06C21C7/064C21C7/10C22C22/00C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C22C38/58Y02P10/20
Inventor 魏巍杨锋功刘宪民宋平
Owner 石钢京诚装备技术有限公司
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