How to control the drawing speed in continuous casting production? 10

Modern continuous casters have a device to automatically control the water surface height of the tundish steel, and when the pouring parameters fluctuate, it can automatically control the opening degree of the ladle sliding nozzle, so that the amount of tundish steel is always unchanged, creating conditions for stable pulling speed.

In addition, the control of the drawing speed is also closely related to the tundish steel flow control device. There are three ways to control the tundish steel flow.

1) Plug rod type.

The plug rod control is to control the size of the steel flow through the lifting, and the structure has two types: combined and integral. Its advantages are that it is easy to control when pouring, has a high success rate of pouring, and can effectively prevent the vortex of molten steel at the nozzle. However, the plug stick type is not conducive to automatic control.

2) Sliding nozzle type.

The sliding spout controls the size of the steel flow by sliding the slide of the slide plate. The advantages are the long stroke, the precise adjustment of the molten steel flow, and the ease of automatic control.

3) Nozzle type.

Mainly used for billets. Due to the high tensile speed of pouring small-section casting billets, the control of steel flow with plug rods is easy to cause large fluctuations in the liquid level in the mold, and the flow rate of the fixed-diameter nozzle is relatively stable.

It should be noted that in production practice, the injection flow should be small when the drawing speed is controlled, so that the molten steel can solidify on the ingot head and facilitate the smooth drawing. The starting time is generally about 20s for small billets, about 40s for large billets, and about IMLN for slabs. If the steel flow is too large and the starting time is insufficient, it is easy to disconnect the casting billet from the ingot rod, resulting in the opening and pouring leakage accident.

If the opening and pouring steel flow is too small, it will also cause the molten steel to freeze in the nozzle. Generally, the starting drawing speed during pouring should be lower than the working drawing speed, the small billet is about 60% 80% of the working drawing speed, and the large section casting billet is about 50% 60%. When the molten steel in the ladle has been filled, the pulling speed gradually decreases with the reduction of the liquid level of the tundish, and the starting pulling speed is still maintained after the molten steel in the tundish is filled, so as to ensure the capping and solidification of the tail of the casting billet.

Hehe: Very learned

According to the size of the billet section, the size of the second cold water, and the temperature of the molten steel, the drawing speed is controlled.

The size of the section and the temperature of the molten steel are inversely proportional to the drawing speed, the larger the section, the slower the drawing speed, and the similar, the higher the temperature.

The higher, the lower the pulling speed. Second, the water distribution of cold water directly affects the quality of the casting billet, to be appropriate, not the bigger (smaller) the better!

Depending on the temperature of the water and the size of the product.

Caster pulling speed refers to the speed at which the casting billet is pulled out of the mold by the ingot rod. Generally, it is 1m min and 4m min.

The pulling speed determines the production efficiency of the caster. However, high drawing speed and high billet quality are often contradictory. Therefore, it is necessary to unify the drawing speed and quality according to the quality requirements of the variety.

If you don't do continuous casting, you only need to know the length of the casting billet drawn in 1 minute, and if you do this line, the reference refers to the speed at which the casting billet is pulled out of the mold by the ingot rod.

Summary. A major problem with continuous casting is the breakage of the continuous casting billet. If the solidified metal shell is too thin, there is a risk that the metal below the billet will break the metal that is condensing above after a certain length is pulled out, causing the molten steel to leak and then destroy other machines and cause accidents.

Normally, the fracture is due to the excessive pull-out speed, which makes the solidification, and the above is mine.

I'm sorry I don't understand, but can you elaborate on that?

A major problem with continuous casting is the breakage of the continuous casting billet. If the solidified metal shell of the steel billet is too thin, it may cause the metal that is condensing above the billet to break after being pulled out to a certain length, resulting in the leakage of molten steel, and then the accident will occur due to the destruction of other machines. Normally, the fracture is due to the excessive pull-out speed, which makes the solidification, and the above is mine.

Summary. Do you mean how to set the pulling speed in the continuous casting process?

This is mainly based on the drawing speed and cross-section, but at the same time the casting machine conditions (e.g. metallurgical length or mold cooling strength) determine the maximum drawing speed.

How to calculate the drawing speed of continuous casting?

Hello, I have seen your question, and I am sorting out the answer, please wait for a while Oh Dear, I am glad to answer for you for Jane Do you mean how to set the speed of the continuous casting process, right? It is mainly based on the drawing speed and cross-section, but at the same time, the casting machine conditions (such as metallurgical length or mold cooling strength) determine the maximum drawing speed.

I'm talking about how to calculate the pulling speed.

If the speedometer is broken during production, how can we calculate what the current speed is?

If the speedometer is broken, the speed of the billet can be calculated in seconds, or it can be calculated by formula. The second Kai repentance quickly multiplied the length of the steel billet of the banquet branch. Divide by 60 to know how much Sun Min is!

I hope these contents can help you, and I wish you a happy life and a happy family<> "Bixin".

Summary. This does not need to be calculated, the speed is determined by the size of the spout itself. That is, there is a general range, and the nozzle pulling speed may be in between. It is mainly determined by the speed at which molten steel flows out of the nozzle.

This does not need to be calculated, and the speed is determined by the size of the spout. That is, there is a rough range of nuclear pants, and the nozzle pull speed may be in between. Next to the main change, there is a brief determination of the speed of molten steel flowing out of the nozzle.

If the time is 86 seconds, the billet length is what the pulling speed should be.

How to calculate. This does not need to be calculated, and the speed is determined by the size of the spout. That is, there is a rough range of nuclear pants, and the nozzle pull speed may be in between. Next to the main change, there is a brief determination of the speed of molten steel flowing out of the nozzle.

The speedometer is broken.

I'd like to know what the current pull speed is.

Determined by the outflow rate.

I just want to know what the current pull speed is.

I'm going to do the formula.

Summary. Hello, what is the wear and tear speed of the continuous casting tension leveler you consulted, one of the important signs of modern continuous casting technology is high drawing speed, especially in the production of carbon steel continuous casting machine, a higher drawing speed production mode is generally used, taking 150mm continuous casting billet as an example, the current domestic general drawing speed is about 3 4m min.

Prevention of longitudinal cracks on the surface of rectangular billets.

Continuous casting rectangular billet brother slip crystallization dust simple water, how to calculate the water flow rate of each section of these three auspicious pants (400mm * 165mm 450mm * 165mm 500mm * 165mm) these three.

Hello, what is the wear and tear speed of the continuous casting tension leveler you consulted, one of the important signs of modern continuous casting technology is the high drawing speed, especially the dust is commonly used in the production of carbon steel continuous casting machine, the production mode of higher drawing speed is generally used in the production of carbon steel continuous casting machine, taking the 150mm continuous casting loss of the square billet as an example, the current domestic general drawing speed is about 3 4m min.

The precautions for longitudinal cracks on the surface of the rectangular billet you consult (1) Increase the endpoint C content, avoid the crack sensitive area within the range, and keep the C content as. 2) Reduce the S content in molten steel, avoid the reaction between FeS and Fe to form hot brittle co-crystals, and increase Mn S (generally greater than 30), which can reduce the probability of longitudinal cracking. (3) Improve the temperature system to ensure that the superheat of the tundish molten steel is 15 25, and ensure that the casting machine draws the billet at a constant speed.

(4) Optimize the performance of the protective slag to ensure the stability of the thickness of the liquid slag layer (10 15mm) and consumption. 5) The immersion depth of the immersion nozzle is kept between 120 and 150mm to ensure the stability of the flow field in the crystallizer. (6) Adhere to the automatic control system of the liquid level of the crystallizer, and when the automatic control of the liquid level is unstable, it should be changed to manual pouring in time to ensure that the fluctuation of the liquid level is in the minimum range, and the target value of the fluctuation is controlled at the small size of (3 5) mm.

The calculation of the water flow rate you consult, you need to determine the specific water volume of the smart brigade according to the steel grade, the drawing speed and the temperature of each section of the casting billet, and the temperature of the tension leveler" refers to the amount of cooling water used per unit weight of molten steel, expressed in l kg, when the cooling water distribution ratio of each section of the secondary cooling is determined, and the rate of pouring steel is known, you can calculate the cooling water amount next to each cold filial piety stool but the grinding area. Different casters have different specific water values. I hope mine can help you.

2. How to calculate the specific water volume of cold water, and the water distribution ratio of each section (10 meter arc, 4 sections).

Hello, "specific water" refers to the amount of cooling water used per unit weight of molten steel, expressed in l kg, when the proportion of cooling water distribution in each section of secondary cooling is determined, and the scale rate of pouring steel is known, the cooling water amount of each cooling zone can be calculated. Different casters have different values for different water gears.

During the continuous casting operation, try to ensure the "three constants", namely: "constant liquid level, constant temperature, and constant drawing speed", in which the benefits of constant drawing speed are as follows:

1. The secondary cold water distribution generally changes with the drawing speed, and the water volume fluctuates with the pulling speed, which affects the solidification process of the billet

2. No matter how good the automatic liquid level control is, when the pulling speed fluctuates, the liquid level will also fluctuate, which will affect the surface quality of the billet, such as: vibration mark depth, surface slag inclusion, etc.;

3. The drawing speed fluctuates too much, and the thickness of the mold billet shell is uneven in the direction of the drawing steel, which is easy to break the steel leakage

4. When the drawing speed fluctuates too much, it will also affect the contact between the billet shell and the copper pipe of the mold, affect the lubrication of the protective slag, and easily produce bonding and leakage.

However, the premise of constant drawing speed is the stability of the tundish temperature, if the temperature is too high or too low, one-sided emphasis on the drawing speed temperature will also be unfavorable to the quality of the billet.

The constant drawing speed of continuous casting is conducive to the stability of the internal quality (central segregation) of the slab and the purity of the epidermis.