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Smelting method for producing medium-thickness plate through RH single-linkage process

A smelting method and process technology, applied in the field of steelmaking, to achieve the effect of excellent internal quality and stable production

Inactive Publication Date: 2016-10-12
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a smelting method for producing medium and heavy plates using the RH single process, which solves the problem of stable control of the pass rate of low alloy medium and heavy plates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The steel type Q345DH adopts the following process route: hot metal desulfurization pretreatment—converter smelting—RH vacuum refining—calcium treatment—slab continuous casting.

[0018] 1. Desulfurization pretreatment of molten iron: the sulfur content after desulfurization pretreatment of molten iron is 40ppm;

[0019] 2. Converter smelting: All raw and auxiliary materials are required to be kept dry during the smelting process, and the moisture content is 0.30wt%.

[0020] Tapping adopts strong deoxidation and stirring to ensure the removal of large particle deoxidation products.

[0021] 3. RH vacuum smelting: hydrogen content control: RH vacuum treatment increases the flow rate of argon to 12NL / min per ton of steel, the vacuum treatment time is controlled at 20min, the vacuum degree is controlled at 10Pa, and the hydrogen content in the steel at the end of vacuum is controlled at 1.5ppm.

[0022] RH vacuum treatment is adopted to ensure the vacuum treatment time t...

Embodiment 2

[0027] Steel type Q345BH adopts the following process route: hot metal desulfurization pretreatment—converter smelting—RH vacuum refining—calcium treatment—slab continuous casting.

[0028] 1. Desulfurization pretreatment of molten iron: the sulfur content after desulfurization pretreatment of molten iron is 30ppm;

[0029] 2. Converter smelting: All raw and auxiliary materials are required to be kept dry during the smelting process, and their moisture content is 0.50wt%.

[0030] Tapping adopts strong deoxidation and stirring to ensure the removal of large particle deoxidation products.

[0031] 3. RH vacuum smelting: RH vacuum treatment lifts the flow rate of argon to 8NL / min per ton of steel, the vacuum treatment time is controlled at 15min, the vacuum degree is controlled at 100Pa, and the hydrogen content in the steel is controlled at 2.0ppm at the end of vacuum.

[0032] RH vacuum treatment is adopted to ensure the vacuum treatment time to ensure the removal of fine deo...

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Abstract

The invention discloses a smelting method for producing medium and thick plates by adopting an RH single process, belonging to the technical field of steelmaking. Desulfurization pretreatment of molten iron; converter smelting: the moisture content of all raw and auxiliary materials is controlled at ≤0.50wt%, and the steel is deoxidized and stirred; RH vacuum treatment: argon is 6-12NL / min per ton of steel, and the hydrogen content in the steel is ≤2.0 at the end of vacuum ppm; Calcium treatment: use calcium treatment to denature the non-metallic inclusions and control the calcium content in the steel at 15-20ppm; continuous casting for plate failure: constant casting speed, superheat ≤ 25°C, reduction 5.5-6.5mm, etc. The craft is complete. The advantages are: the quality of the finished product is excellent, the pass rate of flaw detection is controlled above 99.6%, and the industrialized, batch and stable production of this type of steel is realized.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a smelting method for producing medium-thick plates by adopting an RH single-pass process. In particular, it relates to a smelting method for producing low-alloy medium-thick plates with flaw detection by adopting the RH single-pass process. Background technique [0002] In order to ensure the internal quality of steel plates, medium and heavy plate products need to be tested by non-destructive flaw detection. There are two factors that affect the results of steel plate flaw detection. The internal quality leads to unqualified flaw detection; the second is that there are large-grained brittle non-metallic inclusions in the steel, which are deformed during the rolling process, and there is a gap between the non-metallic inclusions and the steel matrix, resulting in unqualified flaw detection. In order to ensure that the low-alloy medium-thick plate is qualified fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/10C21C7/00
CPCC22C33/04C21C7/0006C21C7/10
Inventor 李战军刘金刚初仁生史志强王东柱郝宁陈霞
Owner SHOUGANG CORPORATION
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