Ultra-high-strength and high-toughness alloy structural steel and its smelting process
A technology of alloy structural steel and ultra-high strength, which is applied in the direction of improving process efficiency, furnaces, electric furnaces, etc., and can solve problems such as polluting the environment, difficulty in organizing production, and oil temperature that cannot meet process requirements.
Active Publication Date: 2022-05-03
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology
In view of the above characteristics, oil cooling can only be used in actual production, which not only pollutes the environment, especially in hot summer, it is difficult to organize production because the oil temperature cannot meet the process requirements; at the same time, the tensile strength of traditional ultra-high-strength and high-toughness alloy structural steel is only It can reach 1600Mp, and the impact toughness AKU can only be around 60J, which cannot better meet the current market demand for ultra-high-strength and high-toughness steel
Method used
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Embodiment
[0030] Embodiment: electric arc furnace smelting + ladle refining + vacuum degassing + vacuum self-consumption. The development of an ultra-high-strength and high-toughness new material product includes the following steps:
[0031] Step 1), select high-quality steel scrap or steel shavings, high-quality pig iron with low five harmful elements, and sponge iron, and control the five harmful elements of raw materials As≤0.006%; Sn≤0.006%; Pb≤0.001%; Sb≤0.006%; Bi≤0.001 %, As+Sn+Pb+Sb+Bi≤0.05%. Ferromolybdenum is put into the electric furnace together with the charge to remove harmful P elements as soon as possible;
[0032] Step 2), heat up the ladle furnace during refining, adjust the temperature to ≥1550°C, add lime and fluorite to adjust the amount of slag, adjust the slag basicity (R) to 2.0-3.0, fine-tune the alloy to make the composition reach the target composition, and vacuum degassing time ≥20min, the temperature is 1500℃~1550℃, pouring into electrode blanks or forgin...
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Abstract
The invention relates to an ultra-high-strength and high-toughness alloy structural steel with a more economical and environmentally friendly smelting method and higher production efficiency and its smelting process. It adopts electric arc furnace smelting + ladle refining + vacuum degassing + vacuum self-consumption, and selects high-quality scrap steel or steel. Shavings, high-quality pig iron with low five harmful elements, sponge iron, control the five harmful elements of raw materials, ferromolybdenum is put into the electric furnace together with the charge; when the ladle furnace is refined, the temperature is raised, and the temperature is adjusted to ≥ 1550 ° C, and lime and fluorite are added to adjust the amount of slag. Adjust the basicity of the slag, fine-tune the alloy to make the composition reach the target composition, vacuum degassing and pouring into an electrode billet or forging a steel ingot into a self-consumable billet, the surface of the electrode billet or forged middle billet before vacuum self-consumption speed control to achieve the purpose of removing inclusions and gases; the chemical composition meets the design requirements; after heat treatment, the strength level is above 1700Mpa, and the impact toughness AKU is not less than 64J. It is used in the field of ultra-high-strength and high-toughness materials, such as aerospace.
Description
technical field [0001] The invention belongs to the field of new material development and its smelting technology, and in particular relates to an ultra-high-strength and high-toughness alloy structural steel with a more economical and environmentally friendly smelting method and higher production efficiency and a smelting process thereof. Background technique [0002] At present, the traditional smelting method of ultra-high-strength and high-toughness alloy structural steel in China adopts vacuum induction + vacuum self-consumption. Due to the shortcomings of vacuum induction furnaces such as high requirements for raw materials, small furnace tonnage, and low production efficiency, there are problems such as tight supply of materials, long delivery time, and high prices. As scientific research products become more mass-produced, the market supply and demand tend to be more tense; while the Mf transformation point of traditional ultra-high-strength and high-toughness alloy ...
Claims
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IPC IPC(8): C22C38/58C22C38/48C22C33/04C21C5/52C21C7/076
CPCC22C38/58C22C38/48C22C38/46C22C38/44C22C38/02C22C33/04C21C5/52C21C7/076Y02P10/20
Inventor 曹鹏敏王怡群许婷婷胡建成赵东崔晓宁赵光全徐宁赵林伟李军普赵彩艳
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD