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Smelting method of nitrogen-containing high-strength steel 32AB5

A 32AB5, smelting method technology, applied in the field of iron and steel metallurgy, can solve the problems of not being able to accurately control the smelting method of nitrogen-containing high-strength steel, narrow, and high production difficulty, and achieve the effects of low production cost, simple production process, and guaranteed quality and performance.

Active Publication Date: 2020-02-21
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the narrow range and high production difficulty, there is no smelting method that can accurately control the nitrogen content of nitrogen-containing high-strength steel 32AB5

Method used

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  • Smelting method of nitrogen-containing high-strength steel 32AB5
  • Smelting method of nitrogen-containing high-strength steel 32AB5

Examples

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Embodiment 1

[0043] In the embodiment of the present invention, the nitrogen-containing high-strength steel 32AB5 is produced by using semi-steel after vanadium-containing titanium hot metal extracting vanadium and desulfurization as raw material, wherein, the semi-steel contains 3.51% C, 0.040% Mn, 0.063% by mass percentage. % of P, 0.007% of S, 0.03% of V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0044] Specific steps:

[0045] (1) Converter primary smelting process: Add 235 tons of the above-mentioned semi-steel into a 200-ton (nominal capacity) top-bottom double-blowing converter, and use the function of the top-bottom double-blowing converter to decarburize the above-mentioned semi-steel into molten steel. During the initial smelting process of the converter, argon gas is blown to the breathable bricks at the bottom of the converter throughout the whole process to ensure that the gas supply flow rate of a single brick reaches 50m 3 / h, the argo...

Embodiment 2

[0051] Embodiment 2 is the same as Embodiment 1 except that the tapping time of the converter primary smelting process is 5 minutes.

[0052] The chemical composition of the finished product of this embodiment is: C content is 0.055wt%, Si content is 0.03wt%, Mn content is 0.20wt%, P content is 0.009wt%, S content is 0.008wt%, Als content is 0.015wt%, The N content is 0.0025 wt%, and the Ti content is 0.005 wt%.

[0053] The properties of the rolled material obtained in this embodiment are as follows: yield strength 293MPa, tensile strength 389MPa, BH2 37.

Embodiment 3

[0055] Example 3 is the same as Example 1 except that the LF refining time is 30 minutes.

[0056] The chemical composition of the finished product in this embodiment is: C content is 0.065wt%, Si content is 0.045wt%, Mn content is 0.23wt%, P content is 0.012wt%, S content is 0.012wt%, Als content is 0.030wt%, The N content is 0.0032 wt%, and the Ti content is 0.010 wt%.

[0057] The properties of the rolled material obtained in this embodiment are as follows: yield strength 294MPa, tensile strength 386MPa, BH2 37.

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Abstract

The invention provides a smelting method of nitrogen-containing high-strength steel 32AB5. The smelting method comprises a converter primary smelting process, an LF refining process and a continuous casting process. In the converter primary smelting process, the converter tapping nitrogen increase is controlled to be 0.0006-0.0010% by blowing argon in the whole process and controlling the oxygen lance position and the tapping time during and after carbon drawing. In the LF refining process, the refining process nitrogen increase is controlled to be 0.0001-0.0005% by controlling the refining time. In the continuous casting process, the continuous casting process nitrogen increase is controlled to be 0-0.0005% by protecting pouring and controlling the superheat degree of molten steel in a continuous casting tundish. According to the smelting method, the nitrogen component of the finished nitrogen-containing high-strength steel 32AB5 can be strictly controlled within the range of 0.0025-0.0040% by weight, the control precision is high, and the quality and performance of finished steel are guaranteed. Meanwhile, the smelting method is simple in production process and low in productioncost.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for smelting nitrogen-containing high-strength steel 32AB5. Background technique [0002] Compared with traditional high-strength steel, nitrogen-containing high-strength steel 32AB5 has the characteristics of high strength, high work hardening rate and low alloy cost. This is mainly because: traditional high-strength steel usually uses higher content of alloy components such as Mn, Nb, V, Ti, etc., so the alloy cost is high, and 32AB5 adopts Ti nitride by reasonably controlling the composition of titanium and nitrogen in the steel. Precipitation enhances the performance of the steel and avoids the use of excessive high-cost components. [0003] For nitrogen-containing high-strength steel 32AB5, the nitrogen content is very important. If the nitrogen content is too small, the strength of the steel will be affected. If the nitrogen content is too high, ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/00C21C7/068C22C38/02C22C38/04C22C38/06C22C38/14
CPCC21C7/00C21C7/068C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 周伟彭友全张彦恒汪盼吴国荣陈刚王建
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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