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Low-cost smelting silicon-controlling method for hydro-chrome-molybdenum steel

A chromium-molybdenum steel, low-cost technology, applied in the field of low-cost hydrogen chromium-molybdenum steel smelting silicon control, can solve the problems of high silicon sampling at the end of vacuum, affecting contract delivery time, weakening market advantages, etc., to achieve silicon increase Reduce, shorten the effect of strong reduction time, good slag fluidity and reduction

Inactive Publication Date: 2014-05-21
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor stability of the reducing atmosphere control in the smelting process, resulting in high silicon samples after vacuuming, the smelting plan was forced to be changed or the silicon reduction was re-oxidized, which restricted the fulfillment rate of the planned steel grade of this steel type and affected the delivery date of the contract. , at the same time, the production cost has risen sharply, and the market advantage has been weakened

Method used

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  • Low-cost smelting silicon-controlling method for hydro-chrome-molybdenum steel
  • Low-cost smelting silicon-controlling method for hydro-chrome-molybdenum steel

Examples

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Embodiment 1

[0018] The silicon-control technology method for smelting low-cost hydrogen-prone chromium-molybdenum steel (100 tons of molten steel / furnace) in this embodiment, the specific steps are as follows:

[0019] (1) Electric furnace smelting: the proportion of pig iron and iron is not less than 70wt%, and the amount of scrap steel added is less than 30% of the total material; It is strictly forbidden to add any deoxidizer and alloy during the process, and the large package sample [P] ≤ 0.005% of the electric furnace;

[0020] (2) LF refining: 200m of aluminum wire is fed into the refining seat for the first time to strengthen the deoxidation effect of LF in the early stage. After refining and power transmission for 13 minutes, 500kg of carbon powder, 300kg of calcium carbide, and 250kg of aluminum particles are used as diffusion deoxidizers. Yellowish white, to prevent raw materials from increasing silicon in molten steel; add 3000kg of lime and fluorite to make slag during the ref...

Embodiment 2

[0024] The silicon-control technology method for smelting low-cost hydrogen-prone chromium-molybdenum steel (100 tons of molten steel / furnace) in this embodiment, the specific steps are as follows:

[0025] (1) Electric furnace smelting: the proportion of pig iron and iron is not less than 70wt%, and the amount of scrap steel added is less than 30% of the total material; the temperature in the electric furnace for tapping is controlled at 1580°C to ensure that there is no cold material in the furnace, and the steel is tapped It is strictly forbidden to add any deoxidizer and alloy during the process, and the large package sample [P] ≤ 0.005% of the electric furnace;

[0026] (2) LF refining: 200m of aluminum wire is fed into the refining seat for the first time to strengthen the deoxidation effect of LF in the early stage. After refining and power transmission for 15 minutes, 500kg of carbon powder, 300kg of calcium carbide, and 250kg of aluminum particles are used as diffusion...

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Abstract

The invention discloses a low-cost smelting silicon-controlling method for hydro-chrome-molybdenum steel. According to the invention, a smelting process for hydro-chrome-molybdenum steel is adjusted, an aluminum wire is selected as a strong oxidizing agent, carbon powder, calcium carbide and aluminum granules are used as diffusion deoxidizers, so considerable increase of silicon in molten steel caused by raw materials is avoided; slag amount is increased in the process of refining, and good fluidity and reductibility of slag are maintained; strong inert gas is used for protection to avoid secondary oxidation of the molten steel, a reducing atmosphere is controlled and aluminum-controlled is fed in stages to realize deoxidation, so aluminum in the molten steel is enabled to accord with internal control objects on the premise of low silicon; and low-cost low-carbon ferrochromium is used to substitute metallic chromium, so cost is reduced while a same refining effect is obtained.

Description

technical field [0001] The invention belongs to the technical field of alloy steel smelting, and in particular relates to a silicon-controlled method for smelting hydrogen-prone chromium-molybdenum steel at low cost. Background technique [0002] Linhydro 12Cr2Mo1R, Linhydro 12Cr2Mo1VR and other steel plates for pressure vessels are the main varieties that implement the national policy of "progressing through production". They have a relatively high market share in China and enjoy a good market reputation. With the further enlargement of petrochemical equipment and the diversification of exploitable crude oil, the level of flaw detection and the thickness of steel plates of this type of steel plate are required to increase continuously, so the requirements for the physical quality of steel plate products are also further improved. [0003] Compared with general steel grades, the technical difficulty of this steel smelting is reflected in the low requirement of harmful elemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C33/04C21C7/00
CPCY02P10/20
Inventor 赵向政
Owner WUYANG IRON & STEEL
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