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Low-phosphorus low-sulfur high-alloy thick plate blank smelting process

A technology for thick slabs and alloys, which is applied in the smelting process of producing low-phosphorus, low-sulfur, high-alloy thick slabs, and the smelting process of low-phosphorus, low-sulfur, high-alloy thick slabs, achieving high yield, excellent quality, and high investment. less effect

Inactive Publication Date: 2018-08-10
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a low-phosphorus, low-sulfur, high-alloy thick slab smelting process, which solves the technical problems in the production of high-alloy content thick slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Steel type high-alloy die steel 738H, the process route adopted is: hot metal desulfurization pretreatment - converter smelting - tapping alloying - LF furnace refining and alloying - RH vacuum refining - thick slab continuous casting, the specific steps and parameters are as follows, The ingredients involved are mass percentages:

[0017] (1) Phosphorus content control: the converter is smelted by double slag method, the carbon drawing temperature is controlled at 1620°C, and the phosphorus content at the end of the converter is controlled at 0.0080%; the subsequent alloying phosphorus increase is controlled at 0.005%; the phosphorus content of the finished steel is controlled at 0.013%.

[0018] (2) Sulfur content control: [S] in hot metal after pretreatment of molten iron = 0.0050%; high-quality steel scrap and auxiliary materials are used for converter smelting, and the sulfur content of scrap steel is controlled to 0.0050%; sulfur content at the end of the converte...

Embodiment 2

[0023] Steel type high-alloy medium manganese steel, the process route adopted is: hot metal desulfurization pretreatment-converter smelting-tapping alloying-LF furnace refining and alloying-RH vacuum refining-thick slab continuous casting, the specific steps and parameters are as follows, The ingredients involved are mass percentages:

[0024] (1) Phosphorus content control: The converter is smelted by double slag method, the carbon pulling temperature is controlled at 1600°C, and the phosphorus content at the end of the converter is controlled at 0.0070%; the subsequent alloying phosphorus increase is controlled at 0.0075%; the phosphorus content of the finished steel is controlled at 0.0145%.

[0025] (2) Sulfur content control: [S] in molten iron after pretreatment of molten iron = 0.0040%; high-quality steel scrap and auxiliary materials are used for converter smelting, and the sulfur content of scrap steel is controlled to 0.0050%; sulfur content at the end of the conver...

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Abstract

The invention provides a low-phosphorus low-sulfur high-alloy thick plate blank smelting process, and belongs to the technical field of steel making. As for the steps and parameter control, a double slag method is adopted in a converter, the catch carbon temperature is controlled to be 1600-1620 DEG C, and the phosphorus content at the endpoint is controlled to be no more than 0.008 wt%; the content of [S] in pretreated molten iron is no more than 0.0050 wt%; as for slag oxidation controlled by LF refining control, the sum of FeO and MnO is equal to 1.0-1.5 wt%, and the slag adding amount is 8-12 kg per ton of steel; a thick plate blank is adopted for production, and the maximum thickness specification is 400 mm; and the superheat degree is controlled to be 15-25 DEG C in the continuous casting process. The low-phosphorus low-sulfur high-alloy thick plate blank smelting process has the advantages that a production method of a high-alloy steel blank with the alloy amount being 5-12 wt%,the content of finished phosphorus is controlled to be no more than 0.015 wt%, the content of sulfur is controlled to be no more than 0.0025 wt%, and the maximum alloy amount of high-alloy steel canreach to 12 wt%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a low-phosphorus, low-sulfur, high-alloy thick slab smelting process. In particular, it relates to a smelting process for producing low-phosphorus, low-sulfur and high-alloy thick slabs using the "converter + LF furnace" process, wherein the alloy content is controlled at 5%-12%. Background technique [0002] For high-alloy steel with alloy content ≥ 5%, it is mainly produced in special steel plants in China at present. The production process is mainly electric furnace or converter smelting. It is equipped with medium-frequency induction furnace for alloy melting and then blended into molten steel for high-alloy steel. Production, this method can produce alloy steel with high alloy content, the disadvantage is that special equipment is required, the investment is large, and it is only suitable for special steel production, without thick slabs; in addition, some ir...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/064C21C7/10C21C5/28B22D11/16
CPCB22D11/16C21C5/28C21C7/00C21C7/064C21C7/10Y02P10/20
Inventor 李战军初仁生刘金刚王东柱郝宁关春阳谢翠红张建师陈霞王卫华曹磊秦登平
Owner SHOUGANG CORPORATION
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