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Method for producing high-quality special steel through electric furnace all-molten-iron melting technique

An all-hot metal and electric furnace technology, applied in the field of steelmaking production, can solve the problems of unsatisfactory steel purity, strong oxidation of tapping slag and molten steel, unbearable production cost, etc., achieving the final composition level is simple and controllable, reducing molten steel Original oxidizing properties, reducing the possible effect of entering the ladle

Inactive Publication Date: 2015-09-23
SHOUGANG CORPORATION
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AI Technical Summary

Problems solved by technology

That is, the two production processes of converter and electric furnace. The production of high-quality special steel scrap by traditional electric furnace process has high price, high energy consumption, long cycle and high residual elements, and the production cost is unbearable. Although the electric furnace production plant has improved its technology, it also adds part of molten iron for Smelting production, but there is a certain limit to the proportion of molten iron added; using the converter process to produce high-quality special steel, the end point carbon is generally difficult to control, the tapping slag and molten steel are highly oxidizable, and the purity of the steel is not ideal

Method used

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  • Method for producing high-quality special steel through electric furnace all-molten-iron melting technique
  • Method for producing high-quality special steel through electric furnace all-molten-iron melting technique
  • Method for producing high-quality special steel through electric furnace all-molten-iron melting technique

Examples

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Effect test

example 1

[0026] Example 1: Production of high carbon steel bearing steel GCr15

[0027] Adopt 100% full molten iron loading system, molten iron S≤0.050%, total loading capacity is 75 tons, and the furnace wall oxygen lance blows oxygen operation. The final carbon content is 0.56%, and the phosphorus content is 0.008%. Aluminum alloy is used for final deoxidation. The electric furnace uses Si-Mn alloy with Mn. The part that is insufficient for Si is filled with ferrosilicon, and high-carbon ferrochrome is used with chromium. The steel is tapped from the eccentric bottom, and 300kg of slagging material is added for tapping.

[0028] Table 1. Physical quality inspection results

[0029]

example 2

[0030] Example 2: Production of gear steel 20CrMnTi

[0031] Adopt 100% full molten iron loading system, molten iron S≤0.050%, total loading capacity is 75 tons, and the furnace wall oxygen lance blows oxygen operation. The carbon content at the end point is 0.08%, and the phosphorus content is 0.007%. Aluminum alloy is used for final deoxidation. The electric furnace uses Si-Mn alloy with Mn. The eccentric bottom is tapped, and 200kg of slagging material is added for tapping.

[0032] Table 2 Chemical composition of 20CrMnTi object

[0033]

[0034] Table 3 Metallographic results of 20CrMnTi objects

[0035]

[0036] technical effect

[0037] (1) By using the electric furnace full iron molten iron smelting process, the amount of molten iron charged can reach 100%, and the carbon content at the end point can be controlled, which reduces power consumption and the consumption of raw and auxiliary materials such as scrap steel and carbon powder, and saves production cost...

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Abstract

The invention provides a method for producing high-quality special steel through an electric furnace all-molten-iron melting technique and belongs to the technical field of steelmaking. The technological process of production comprises the steps of Consteel furnace all-molten-iron melting, eccentric bottom tapping, LF-VD refining, casting, rolling and product storage. Through the improvement on a Consteel furnace and a technology, an original heating electrode is removed, three oxygen lances are additionally arranged on the wall of the furnace, so that the oxygen supply intensity of the Consteel furnace is increased, and a converter-mode all-molten-iron smelting is adopted; according to required components of the types of smelted steel, the content of an end point component can be controlled, and the original oxidability of molten steel is lowered; the eccentric bottom tapping mode of the Consteel furnace is utilized, high-oxidability slag is prevented from entering a steel ladle, so that the advantages of a converter and an electric furnace are both considered, and all kinds of carbon structural steel, structural alloy steel, alloy steel and other high-quality special steel, such as 45# steel, 40Cr steel, 20-42 CrMo steel, 20CrMnTi steel, 37Mn5 steel and T10 steel, can be produced at a low cost.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, and in particular provides a method for producing high-quality special steel by an electric furnace full iron smelting process, which is suitable for traditional electric furnaces through production equipment transformation and technical upgrading, and can carry out 100% full iron smelting and optimize LF at the same time Furnace refining process to produce all kinds of high-quality special steel grades. Background technique [0002] Premium special steel mainly refers to alloy steel represented by carbon structural steel, alloy structural steel steel, spring steel, gear steel, bearing steel, non-adjusted steel, etc., and generally has low sulfur and phosphorus content requirements, and has a wide range of uses. [0003] Before the present invention, the domestic traditional high-quality special steel production process is mainly divided into two types: scrap steel→electric furnace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 张慧峰关春立孙齐松毕洪志柳洋波崔京玉邓素怀齐晓峰张立志秦绪华
Owner SHOUGANG CORPORATION
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