Continuous casting method capable of preventing head upwarp of casting blank
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A billet and continuous casting technology, which is applied in the field of casting, can solve the problems that affect the stability of continuous casting production, top damage, billet head is easy to warp, etc.
Active Publication Date: 2015-09-09
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology
[0002] The yield strength and hardness of high-nitrogen stainless steel are relatively high in stainless steel. It is very difficult to cast this type of steel with a curved continuous casting machine according to the normal continuous casting method. , leading to the early disengagement of the head of the billet from the dummy chain hook, the failure of the roller or the cutting gun, resulting in the continuous casting of frozen steel, which directly affects the stability of continuous casting production
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Embodiment 1
[0018] The steel type 10Cr21Mn16NiN of this embodiment is carried out on a three-strand round billet arc continuous casting machine. The secondary cooling of the casting machine is divided into five cooling water circuits. The steps are:
[0019] Ⅰ The third-flow round billet has a diameter of 30cm and a section of 706.5cm 2 ; The weight of molten steel out of the LF furnace is 79t, and the temperature is 1495°C.
[0020] Ⅱ When the ladle is poured, when the molten steel in the tundish is 8t, the temperature of the tundish is 1453°C; The covering agent is 160kg; the depth of the immersion nozzle into the molten steel is 140mm; after the casting machine starts, the casting speed is increased to 0.75m / min according to the gradient of 0.1m / min every 10 seconds.
[0021] Ⅲ When the slab enters the secondary cooling zone, the cooling water in the fourth and fifth circuits of the secondary cooling zone is closed.
[0022] Ⅳ When the billet head passes through the tension leveler, ...
Embodiment 2
[0036] The steel type 03Cr18Mn18NiMoN of this embodiment is carried out on a four-strand billet arc continuous casting machine. The secondary cooling of the casting machine is divided into four cooling water circuits. The steps are:
[0037] Ⅰ The four-strand is 20×20mm square billet, the section is 400cm 2 ; The weight of molten steel out of the LF furnace is 75t, and the temperature is 1500°C.
[0038] Ⅱ When the ladle is poured, when the molten steel in the tundish is 8t, the temperature of the tundish is 1455°C; 180Kg of covering agent is added inside; the immersion nozzle is inserted into the molten steel to a depth of 120mm; after the casting machine starts, the casting speed is increased to 0.95m / min according to the gradient of 0.1m / min every 10 seconds.
[0039] Ⅲ When the slab enters the secondary cooling zone, the third and fourth circuit cooling water in the secondary cooling zone are closed.
[0040] Ⅳ When the billet head passes through the tension leveler, set...
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Abstract
The invention discloses a continuous casting method capable of preventing head upwarp of a casting blank and belongs to the technical field of casting. The continuous casting method capable of preventing the head upwarp of the casting blank includes that using a curved spray continuous casting machine with 325-710 square centimeters square section or a curved spray continuous casting machine with 325-710 square centimeters round section; after starting the continuous casting machine, increasing a casting blank pull speed to a target pull speed according to the gradient of 0.1 m/min per 10 seconds; when the casting blank enters a secondary cooling region, closing the last two cooling water loops of the secondary cooling region; when the head of the casting blank passes through a withdrawal and straightening machine, controlling the pressure of a withdrawal and straightening roller at 70 to 100bar; after the head of the casting blank comes out of the withdrawal and straightening machine, opening the last two cooling water loops of the secondary cooling region, and controlling the water amount of the secondary cooling region at 0.28-0.32 L/kg. The continuous casting method capable of preventing the head upwarp of the casting blank avoids various accidents of high-nitrogen stainless steel due to the head upwarp of the casting blank in the continuous casting steel pouring process and enables the continuous casting production stability to be guaranteed.
Description
technical field [0001] The invention relates to a continuous casting method for preventing billet warping, and belongs to the technical field of casting. Background technique [0002] The yield strength and hardness of high-nitrogen stainless steel are relatively high in stainless steel. It is very difficult to cast this type of steel with a curved continuous casting machine according to the normal continuous casting method. , leading to the early disengagement of the head of the billet and the hook of the dummy chain, the failure of the roller or the cutting gun, resulting in the continuous casting of frozen steel, which directly affects the stability of continuous casting production. Contents of the invention [0003] The present invention aims to provide a continuous casting method for preventing billet warping, avoiding various accidents caused by billet warping during continuous casting of high-nitrogen stainless steel, and ensuring the stability of continuous casting...
Claims
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Application Information
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