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Control method for contents of gas elements in 9Ni steel ingot of 40 t or above

A technology of element content and control method, which is applied in the field of steel ingot production, can solve problems such as high gas element content and cannot meet the use requirements, and achieve a reasonable design effect

Active Publication Date: 2020-06-12
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 9Ni steel ingot is one of them. For the needs of some projects, 9Ni steel ingot needs to be manufactured to be more than 40 tons. The largest existing 9Ni steel ingot is only 15 tons, and the content of gas elements in the finished product is relatively high: H content 3ppm, O content 30ppm, The N content is 0.009%, which is basically at the upper limit, which cannot meet the use requirements

Method used

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  • Control method for contents of gas elements in 9Ni steel ingot of 40 t or above

Examples

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Effect test

Embodiment 1

[0022] A method for controlling the content of gas elements in 9Ni steel ingots of more than 40 tons, the specific steps are as follows:

[0023] Step 1: Produce the consumable electrode 1 in the form of vacuum induction, so that the content of gas elements in the consumable electrode 1 is at a low level, and lay a crystallizer and a water-cooled bottom plate in the electroslag furnace to ensure that the entire remelting process For strong cooling, the inert gas is passed into the crystallizer through the air inlet 2 of the furnace cover before the electroslag furnace is energized to minimize the influence of the atmosphere, and the consumable electrode 1 is preheated before use to prevent the consumable electrode 1 The end burst due to immediate overheating, and the metal block fell into the molten pool, causing the steel ingot to be scrapped. Multiple self-consumable electrodes 1 were electroslag remelted into steel ingots of the required weight. The smelting slag for electro...

Embodiment 2

[0027] A method for controlling the content of gas elements in 9Ni steel ingots of more than 40 tons, the specific steps are as follows:

[0028] Step 1, the consumable electrode 1 is smelted by vacuum induction, and the gas element content of the consumable electrode 1 satisfies Table 1;

[0029] Table 1

[0030] element H N content(%) ≤1ppm ≤0.002％

[0031] Step 2, after the consumable electrode 1 is polished, apply a special protective paint, and then bake it;

[0032] Step 3, using compressed air as the protective gas, dry air preparation: the air passes through the air compressor, enters the freezer for drying treatment, and then passes through the oil and gas separator for oil and gas separation, and finally enters the air bag for storage, and the dry air Pour into the crystallizer through the furnace cover;

[0033] Step 4, pass dry air into the crystallizer 10 minutes before power on;

[0034] Step 5, adjust the dry air flow in the crystalli...

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Abstract

The invention discloses a control method for contents of gas elements in a 9Ni steel ingot of 40 t or above. The problem that gas elements in an existing heavy 9Ni steel ingot exceed standards is solved. The control method comprises the following specific steps that firstly, a crystallizer and a water cooling bottom plate are paved in an electric slag furnace, before the electric slag furnace is powered on, protection gas is input into the crystallizer, and a phi AH-8 slag system is adopted by melting slag of electric slag remelting; secondly, during slagging, the flow of the protection gas nthe crystallizer is adjusted, a part of phi AH-8 slag system is added into the bottom of the crystallizer, the interior of the crystallizer is powered on for arc striking, after slagging is finished,the gas inlet quantity of a furnace cover is adjusted, and then a consumable electrode is replaced for remelting; and thirdly, slag H content analysis is carried out every other two hours, and the flow of the protection gas is adjusted according to the analysis result. By means of the control method, the contents of the gas elements in the 9Ni steel ingot of 40 t or above and with the diameter ranging from 1,500 mm to 2,000 mm can be controlled, and in the contents of the gas elements in steel, H is not larger than 2 ppm, O is not larger than 15 ppm, and N is not larger than 0.0040%.

Description

technical field [0001] The invention relates to the field of steel ingot production, in particular to a method for controlling the content of gas elements in 9Ni steel ingots of more than 40 tons. Background technique [0002] The molten steel is poured into the mold through the ladle and solidified to form a steel ingot. After the molten steel is smelted in the steelmaking furnace, it must be cast into an ingot or billet of a certain shape before it can be processed. The process of casting steel ingots with molds is referred to as ingot casting. Steel ingots are still the main raw material for rolling steel production. The quality of the steel ingot, the condition of the ingot shape and its weight play a very important role in the production of steel rolling. [0003] 9Ni steel ingot is one of them. For the needs of some projects, 9Ni steel ingot needs to be manufactured to more than 40 tons. The largest existing 9Ni steel ingot is only 15 tons, and the content of gas el...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C33/04
CPCC22B9/18C22C33/04Y02P10/25
Inventor 陈文君王长军刘振宝陈万华杨志勇聂徐庆
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD