A kind of extra thick electroslag slab production method
A production method and slab technology, which are applied in the field of extra-thick electroslag slab production, can solve the problems of short service life, low yield, and unsatisfactory product internal quality requirements.
Active Publication Date: 2021-04-20
ANSTEEL CAST STEEL CO LTD
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Problems solved by technology
[0004] 1. Defects such as irregular local surface cracks, surface slag grooves, and surface shunt holes are likely to exist in the production of slabs;
[0005] 2. The use of liquid slag to start the arc has the disadvantages of carbon increase at the bottom, low yield, and high cost.
[0006] 3. The melting speed fluctuates greatly, and the internal quality of the product cannot meet the requirements
[0007] 4. The crystallizer has disadvantages such as water leakage, inconvenient disassembly, short service life and high cost
Method used
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[0027] A method for producing extra-thick electroslag slabs, comprising the following steps:
[0028] 1) Select crystallizer: 820×2060×4130mm; consumable electrode specification: 550×1680×5400mm;
[0029] 2) Cooling water system: the initial cooling water volume of the crystallizer is 130m 3 / h, opening 80%;
[0030] Crystallizer inlet water temperature ≤ 35°C, outlet water temperature ≤ 55°C;
[0031] 3) Slag system: binary pre-melted slag; slag amount: 1250-1350kg;
[0032] 4) Deoxygenation and argon blowing system
[0033] a Argon gas flow rate 20-30m 3 / h.
[0034] b Add 5kg of aluminum grains and 5kg of silicon-calcium powder along with the slag, add according to Table 1 after raising the current, and add each item every 20 minutes;
[0035] Table 1
[0036] join time Amount of aluminum pellets added kg / h Calcium silicon powder addition amount kg / h 1-10 hours 2.3 0.5 11-20 hours 2.3 0.5 21 hours later 2.5 After feeding 0.5 ...
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Abstract
The invention relates to a method for producing extra-thick electroslag slabs, comprising the following steps: 1) adopting a crystallizer and consumable electrodes; 2) gradually opening the crystallizer cooling water valve from 80% to 100%; cooling the crystallizer Water inlet temperature ≤ 35°C, outlet water temperature ≤ 55°C; binary pre-melted slag is used; 3) deoxidation and argon blowing: the flow rate of argon gas is controlled at 20-30m 3 / h, add aluminum grains or calcium silicon powder along with the slag for deoxidation; slag: arc start, the current is gradually increased from 6000A, 86V to 28000A, 95V; the ingot is cooled in the crystallizer for more than 5 hours before demoulding, and enters slow cooling Pit; the slow cooling pit is pre-heated to above 400°C, the slab enters the slow cooling pit, and the pit is cooled to below 200°C to exit the pit. The advantage is that the ultra-thick electroslag slab produced by the method of the invention can meet all subsequent quality requirements for electroslag slab production. The component content of the finished electroslag slab meets the technical requirements of the corresponding material.
Description
technical field [0001] The invention relates to a method for producing electroslag ingots, in particular to a method for producing extra-thick electroslag slabs. Background technique [0002] Electroslag metallurgy technology can be considered as a composite technology of metal or alloy refining purification and solidification control. Electroslag remelting (ESR) products have a series of characteristics such as high purity, compact structure, uniform composition and small segregation, and smooth surface. Advantages, electroslag metallurgy technology has developed very rapidly in recent years. Electroslag metallurgy has become the necessary process route for high-end products and special products. The electroslag slab is usually used as the raw material of the rolling process, and the electroslag slab corresponding to the thickness of the rolled steel plate is more than 120mm is usually an extra-thick electroslag slab. [0003] At present, there are very few manufacturers ...
Claims
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IPC IPC(8): B22D23/10
Inventor 李佳东裴兰科葛春钰李海强刘海燕顾鸿飞
Owner ANSTEEL CAST STEEL CO LTD