How to choose tundish nozzles

For more information, please visit tundish refractories.

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Hi, do you know about tundish nozzles I think the answer is yes, let&#;s do a quiz, which one do you think is better? Please write your choice in the comment, then go through the following to see if your choice is bingo.

Factors Influence the Tundish Nozzle Campaign Life
(1)Weight

When the molding pressure is about 300MPa, the bulk density of the zirconium sizing nozzle is large, the porosity is low, and the zirconium sizing nozzle has no crack after molding, and the molding effect is good. The additive can promote the zirconium sizing nozzle. Sintering is beneficial to the increase of density and the decrease of apparent porosity, and the improvement of thermal shock resistance is obvious.?
In a nutshell, that is, with the same drawing, heavier the weight is, the longer service life the tundish nozzle is.

For more graphite electrode priceinformation, please contact us. We will provide professional answers.

(2)Zirconia Core

a) The content of zirconia of the inner core, we can say that the higher content of zirconia , the better performance will be achieved.
b) Length of zirconia core, with the longer zirconia core, the tundish metering nozzle is better.

(3)The smooth appearance means superior production process and stable quality.

Category of Tundish Nozzle
(1)Fully homogeneous sizing nozzle
The nozzle is composed of ZrO2 (60%~95%). The higher the content of ZrO2, the stronger the erosion resistance of the nozzle, the longer the service life and the higher the cost.
Advantage
Uniform chemical composition, good integrity, high strength, corrosion resistance, long service life, safe and reliable.
Disadvantage
High production cost.
(2)Compound sizing nozzle
The body is a low zirconium material, mostly zircon material, and the composite is a high zirconia material. The two are directly combined together, molded once and fired together.
Advantage
The amount of ZrO2 is greatly reduced compared with the homogenizatio type, the production cost is low, the strength is high, and the corrosion resistance is good.?
Disadvantage
Due to the zirconia content of the inner and outer layers is different, the linear expansion coefficient of the material is different, during use, there will be crackage.?
(3)Inlaid sizing nozzle
The inlaid sizing nozzle is divided into two parts: the outer casing and the inner core. They are respectively made of refractory mud and bonded together; the nozzle body is generally made of high-aluminum material; the inner core is made of zirconia.?
Advantage
low production cost and good thermal shock resistance.
Zirconia? content can be produced according to different requirements.
Economic and good performance.
So what&#;s your answer now? Yes, A is the better choice and that is the one manufactured by CX refractories. Hope that the share is helpful for you to make the right choice in the future.?

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:How to choose tundish nozzles
Company name: Henan Changxing Refractory Materials Co.,Ltd
More refractory products:https://www.cxrefractories.com/en-product-solution
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Website:https://www.cxrefractories.com

Refractories

Refractories are ceramic materials designed to withstand the very high temperatures (in excess of 1,000°F [538°C]) encountered in modern manufacturing. More heat-resistant than metals, they are used to line the hot surfaces found inside many industrial processes.

In addition to being resistant to thermal stress and other physical phenomena induced by heat, refractories can withstand physical wear and corrosion caused by chemical agents. Thus, they are essential to the manufacture of petrochemical products and the refining of gasoline.

Refractory products generally fall into one of two broad categories: preformed shapes or unformed compositions, often called specialty or monolithic refractories. Then, there are refractory ceramic fibers, which resemble residential insulation, but insulate at much higher temperatures. Bricks and shapes are the more traditional form of refractories and historically have accounted for the majority of refractory production.

Refractories come in all shapes and sizes. They can be pressed or molded for use in floors and walls, produced in interlocking shapes and wedges, or curved to fit the insides of boilers and ladles. Some refractory parts are small and possess a complex and delicate geometry; others, in the form of precast or fusion-cast blocks, are massive and may weigh several tons.

Benefits from material property enhancement

Regardless of how complex or sophisticated the refractory castable is that is selected for an application, the physical properties of the material can be drastically reduced if care is not taken during the mixing, pouring, and curing processes. Particularly with the use of more complex refractory castables to solve specific wear issues, installation variables become even more critical to the performance of a lining. Unfortunately, lining quality is often compromised by field conditions during material placement. Project schedules, crew skill levels, equipment availability, job cost pressures, or other demands can sometimes influence proper refractory installation. Improper water addition, mix time variations, over- or under-vibration, and improper curing can drastically affect material quality. With precast shapes, cast in a controlled shop environment, the physical properties of a castable can be more fully optimized.

Initial drying and firing of a refractory castable is a critical installation variable that can influence lining performance. Precast shapes are typically fired in a digitally-controlled furnace prior to shipment, ensuring that the refractory manufacturer & recommended bake-out schedule is closely followed. Since the shapes are fired slowly from all sides, the moisture is removed through the entire thickness of the shape in a controlled manner. Depending on the temperature to which the shape is fired, this can optimize the physical properties of the material through the entire thickness of the shape, not just the hot face surface. This results in a truly homogeneous lining. Micro-cracks within the shape, which are often introduced during field bake-out but may go unnoticed, may also be reduced since the initial firing is more controlled.

In service, linings composed of precast shapes often see less stress and cracking, due to the independent, & floating nature of the lining. The performance of the lining can also be more predictable, resulting in better opportunities to plan for maintenance and repairs.