Steel ingot heating energy-saving method
A technology for steel ingots and heating furnaces, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of high energy consumption, long heating time, and inadaptability to efficient and fast production in factories, so as to increase furnace charging temperature, increase productivity, shorten Effect of time and soak time
Active Publication Date: 2012-07-25
INNER MONGOLIA NORTH HEAVY INDS GROUP
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Problems solved by technology
[0002] The 10-17.5t PCrNi3MoV steel ingots in the factory need to be preheated for more than 45 hours to be heated to the forging temperature. Long heating time consumes a lot of energy, which is not suitable for efficient and fast production in the factory.
Method used
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Experimental program
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Effect test
Embodiment Construction
[0009] The present invention heats 10t of PCrNi3MoV blanks in a trolley-type heating furnace heated by natural gas: put the cold steel ingot into the heating furnace at a temperature of 650°C, and keep the temperature for 8h; ℃, the holding time is 10 hours, so that the steel ingot can complete the preheating process and the whole process of austenite transformation in the preheating stage, shorten the preheating heating time, and then heat it to the forging temperature of 1220±20℃ at a heating rate of 100℃ / h , keep warm for 3h. Finally out of the furnace for forging.
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The invention relates to a steel ingot heating energy-saving method which belongs to the field of machinery manufacture and comprises the following steps of: loading 10-17.5 tons of cold steel ingots into a heating furnace the temperature of which is 620-650 DEG C, and preserving the heat for 8-12 hours; then rapidly heating to 830-860 DEG C at the temperature rise speed of 50-70 DEG C / h, and preserving the heat for 10-18 hours; then heating to the forging temperature of 1200-1240 DEG C; carrying out heat preservation and then discharging and forging. In the invention, the temperature rise speed is accelerated through increasing the charging temperature and the preheating temperature to lead the cold steel ingots to complete the preheating process and the whole process of austenite transformation at the preheating stage, and thereby, the preheating time of the steel ingots can be shortened by about 25 percent, and the energy saving and consumption reduction effects are remarkable and at the leading domestic level.
Description
technical field [0001] The invention relates to an energy-saving method for heating a steel ingot, which belongs to the field of machinery manufacturing. Background technique [0002] The 10-17.5t PCrNi3MoV steel ingots in the factory need to be preheated for more than 45 hours to be heated to the forging temperature. Long heating time consumes a lot of energy, which is not suitable for efficient and fast production in the factory. Natural gas has high fuel calorific value efficiency, the use of advanced refining equipment and the improvement of smelting technology, and the purity of steel has been continuously improved, creating conditions for increasing the heating rate and researching and formulating new energy-saving heating processes for steel ingots. Contents of the invention [0003] The object of the present invention is to provide an energy-saving method for heating steel ingots, which can shorten the preheating heating time of steel ingot forging temperature, has...
Claims
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IPC IPC(8): C21D9/70
Inventor 张奇志胡永平任胜利田君石宝凤李连贵青格勒图高军
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP