Smelting method of non-quenched and tempered steel

A smelting method and technology for non-quenched and tempered steel, applied in the field of metallurgy, can solve the problems of secondary oxidation of molten steel, affecting the fluidity of molten steel in the continuous casting process, and the purity of molten steel, achieving stable nitrogen content control, ensuring fluidity of molten steel, and improving solubility. Effect

Active Publication Date: 2019-07-26
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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  • Smelting method of non-quenched and tempered steel
  • Smelting method of non-quenched and tempered steel
  • 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 smelting method of non-quenched and tempered steel. The smelting method comprises the working procedures of converter smelting, LF refining, VD vacuum treatment and continuous casting, and comprises the specific technological steps that (1) nitrogen is blown at the bottom in the whole converter smelting process, and converter high-carbon drawing and tapping is carried out; (2) diffusion deoxidation is carried out in the LF refining process, good deoxidation and desulfurization effects are guaranteed, and the N content of molten steel after LF finishing is 75-90ppm; (3) VD vacuum treatment is carried out, wherein the content of N in the molten steel after hollow breaking is 50-60 ppm, after hollow breaking, soft blowing time is larger than or equal to 30 min, and argon flow is smaller than or equal to 25 L/min; and (4) continuous casting adopts crystallizer stirring and tail-end stirring, medium-high carbon tundish covering agent and medium-carbon crystallizercovering slag are used, and continuous casting billets are cooled slowly in an off-line mode. According to the smelting method of the non-quenched and tempered steel, the nitrogen content yield is stable, the performance of the non-quenched and tempered steel is good, calcium cyanamide (CaCN2) is not adopted, environmental pollution is small, the feeding amount of the manganese nitride wire is small, and the production cost is low.

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 Applications(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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