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Method for manufacturing 9Ni large steel ingot with 40 tons or more

A manufacturing method and technology for steel ingots, applied in the field of steel ingot manufacturing, can solve the problems of difficult manufacturing, long smelting time, easy to produce quality problems, etc., and achieve the effect of reasonable design and meeting the needs of use.

Inactive Publication Date: 2020-05-12
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. It is difficult to manufacture and takes a long time to smelt, which is prone to quality problems.

Method used

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  • Method for manufacturing 9Ni large steel ingot with 40 tons or more
  • Method for manufacturing 9Ni large steel ingot with 40 tons or more
  • Method for manufacturing 9Ni large steel ingot with 40 tons or more

Examples

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Embodiment 1

[0020] A kind of manufacture method of more than 40 tons 9Ni large steel ingot, concrete steps are as follows:

[0021] Step 1: Produce consumable electrodes in the form of vacuum induction, so that the quality of raw materials for electroslag remelting can be further improved, and the chemical composition of consumable electrodes is retested, especially for P elements, which should be controlled within one The extremely low level ensures the performance requirements of 9Ni products in low temperature environment;

[0022] Step 2: Use consumable electrodes with a diameter of 580mm as the raw material for electroslag remelting, and remelt multiple consumable electrodes into steel ingots with the required weight. The smelting slag for electroslag remelting is φAH-8 Slag system, φAH-8 slag system includes a mixture of fluorite, white corundum, lime, quartz sand and fused magnesia in a weight ratio of 62:18:10.2:4.5:3.8, and dry air is used for electroslag remelting. Protection, ...

Embodiment 2

[0025] A kind of manufacture method of more than 40 tons 9Ni large steel ingot, concrete steps are as follows:

[0026] Step 1. Adopt the single-phase bipolar series working mode of the 450t electroslag furnace to maintain ultra-high power during the electroslag remelting process. Use a copper-walled water-cooled crystallizer and a water-cooled bottom plate with an inner diameter of 1500mm. The copper-walled water-cooled crystallizer and the crystallizer The water intake of the water-cooled bottom plate is kept at 1000m 3 / hour, to ensure that the temperature difference between the inlet and outlet water during smelting is not higher than 5 degrees Celsius, the entire electroslag remelting process is strong cooling, and the vacuum induction method is used to smelt the consumable electrode, and the gas element content of the consumable electrode meets the requirements in Table 1. Consumable electrodes are assembled, and every four consumable electrodes are paired into a group....

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Abstract

The invention discloses a method for manufacturing a 9Ni large steel ingot with 40 tons or more, and aims to solve the problem that in the prior art, a manufacturing method of the 9Ni steel ingot withthe large weight does not exist. The method comprises the following specific steps that step 1, consumable electrodes are produced in a vacuum induction mode, and chemical composition rechecking is carried out on the consumable electrodes; step 2, the consumable electrodes are used as raw materials for electroslag remelting, the plurality of consumable electrodes are subjected to the electroslagremelting to become the steel ingot with the required weight, smelting slag of the electroslag remelting adopts a phi AH-8 slag system, atmosphere protection is carried out by adopting dry air duringthe electroslag remelting, the content of H elements in the remelting process is controlled, a deoxidizing agent is added quantitatively in a timing mode, and during the electroslag remelting, slag sample analysis and slag H analysis are carried out; and step 3, the ingot is stripped in 5-8 h after the electroslag remelting is finished, forging is carried out within 2 h, and a thermal insulation cover is adopted for protection during the period of forging. According to the method, the steel ingot is smelted in a manner of vacuum induction production of the consumable electrodes and the electroslag remelting, and the 9Ni steel ingot with 40 tons or above can be produced.

Description

technical field [0001] The invention relates to the field of steel ingot manufacturing, in particular to a method for manufacturing a 9Ni large steel ingot 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 be more than 40 tons. The largest existing 9Ni steel ingot is only 15 tons. It is difficult to manufacture and takes ...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22B9/193C22C38/46C22C38/44C22C38/42C22C38/04C22C38/02
CPCC22B9/18C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46Y02P10/25
Inventor 朱孝渭杨志勇陈万华王长军周恩民王太江
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD