International standard for the volume density of firebrick

China refractory brick is divided into ordinary clay refractory bricks, dense clay refractory bricks, high-density clay refractory bricks, silica bricks, magnesia carbon bricks, aluminum-magnesium carbon brick, the bulk density of different, some soft, and some hard.

According to the different types of raw materials used in the production of refractory bricks, the density of the refractory bricks china is different. The general refractory is measured at the factory before the bulk density and bulk density: the ratio of the mass of the dried product to its total volume, expressed in g / cm3 , The bulk density index is the main indicator of the degree of product density, high density, you can reduce the external slag and other invasive.

Ordinary clay refractory bricks are generally 1.8 ~ 2.0g / cm3, dense clay refractory bricks are generally 2.05 ~ 2.20g / cm3, high dense clay refractory bricks are generally 2.25 ~ 2.30g / cm3, silica bricks are generally 1.80 ~ 1.95g / cm3 , Magnesium bricks are generally 2.60 ~ 2.70g / cm3, aluminum and magnesium.
Carbon brick is generally 2.90 ~ 3.00g / cm3, the product of the bulk density index is the product volume and the composition of the comprehensive reflection of the composition of minerals, because it is easier to measure, in production is usually used as a means to determine the degree of sintering products.

We are mainly engaged in the production of refractory bricks, high alumina bricks, high alumina refractory bricks, alkali-resistant bricks, clay tiles, insulation bricks, light high alumina bricks, low creep high alumina bricks, Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please call our service hotline.

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Prevention and elimination of forging cracks (2)

Ultrasonic testing showed that the existence of cracks and pore defect of large forgings is an important cause of waste, most of which is due to internal blank there are loose, coarse grained inclusions, and cracks. They are due to the local inhomogeneous deformation, under great stress concentration and shear stress, which leads to the closure, compaction and the generation of deformation damage. Therefore, smelting of refractory raw materials, hot forging comprehensive control, cracks and eliminate the cause and condition is the effective measures to improve forging quality. However, for large forgings with inner crack defects have the healing repair, reopening to prevent scrap also has important economic significance.

The principleof crack repair: any structure and composition of heterogeneous refractory materials (including micro cracks), in the permit conditions, will tend to homogenization. Its essence is in force (diffusion concentration, electric field, stress field gradient) under the effect of diffusion and migration of metal atoms, the orientation of inner crack healing.

Now the application of high temperature diffusion treatment, pressure diffusion, diffusion and plastic deformation of the combination of healing methods. It have get obvious effect in the large tube plate, large module inclusion crack repair achieved remarkable results, and in the rolling steel tube, crack control.
The crack initiation and propagation in the forging process can be prevented and eliminated by using the internal crack repair mechanism effectively by means of the study and test method of hot forging crack, and combined with the microstructure and thermodynamic analysis of the forging cracks.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
Article Source:Prevention and elimination of forging cracks (2)
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Prevention and elimination of forging cracks (1)

The principle of preventing crack

1. There have many kinds of refractory products in our factory, such as fire brick china, refractory products, calcium silicate products, castable, etc. Chemical components of material should strictly comply with the standards of harmful elements,such as S, P, O, N, CU, AL and other easy to form inclusion elements and An, Sb and other trace elements should be controlled. For example: 1Cr18Ni9Ti austenitic stainless steel, because Ti content exceed the standard will lead to steel ferrite’s increases that caused by forging crack.
2. To strictly control the smelting and casting process. This is to improve the purity of steel, eliminate the metallurgical defects, an important link to prevent crack will occur. Practice has proved that the inclusions in steel and presents lumpy aggregation, coarse grain and grain boundary fragility and blank with micro crack and subcutaneous bubbles, cracks easily damaged.
3. When forging, it is necessary to maintain a good stress state, such as changing the free forging punching into die extrusion forming to improve the stress state, so as to prevent the formation of cracks.
4. Strictly control the deformation temperature. Low temperature hardening, serious plastic decrease; the temperature is too high, overheated, burning, plastic will fall, will be?likely to produce cracks. Only fully of recrystallization interval in softening, is generally a single organization, less possibility of forging crack.
5. Deformation rate has a great impact on the low plasticity material, should be based on the specific material selection of suitable forging equipment, in order to prevent the fracture, such as forged MB5 magnesium alloy in the hammer is easy to crack, and in the press forging is not cracked, the reason is the recrystallization of magnesium alloy under high speed slow, easy deformation and easily broken. Changxing refractory provides refractory products, calcium silicate products, castable & mortar, refractory fire brick, ladle & tundish nozzle, ceramic fiber with high quality for you.

Article Source:Prevention and elimination of forging cracks(1)
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The classification of complicated shape brick

Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory brick manufacturers suggest that special-shaped refractory bricks according to the preparation process can be divided into firing bricks, not burning bricks, fused brick (cast brick), fire-resistant insulation bricks; specific type of refractory bricks by shape and size can be divided into standard Brick, ordinary brick, and so on. Shaped refractory bricks can be used as high-temperature building materials and structural materials for building furnaces and various thermal equipment. Shaped refractory bricks can withstand various physical and chemical changes and mechanical effects at high temperatures. Such as refractory clay brick, high alumina brick, silica brick, magnesia carbon bricks and so on.

Special strength refractories bricks, its main feature is the early high strength, 3-7 days maximum room temperature compressive strength of up to 30MPa or more, the disadvantage is poor in the temperature volumetric stability, reduced strength, the maximum decline of up to 40%, so require room temperature Strength must meet the design and national standards requirements. The main factors that reduce the temperature strength are: low-calcium high-alumina cement of special-shaped refractory brick in the heating furnace oven heating process to a certain temperature (350 ℃ or so), the hydrate began to dehydrate, the hydration of cement stone structure, dense Degree and strength decreased, castable volume changes, then castable body strength dropped to the lowest point, then stabilized.

With the heating temperature rose to 1100 ℃, the cement stone gradually sintered, shaped refractory brick crystal began to convert mullite crystals. With the rising temperature, mullite crystals continue to grow, castable in the matrix glass phase was liquid state, the formation of high temperature ceramic sintered, the strength significantly improved. At about 1300 ℃, the strength of the special-shaped refractory brick body can reach more than 60MPa, which is a special characteristic of the special-shaped refractory bricks at high temperature.

Xinmi Changxing furnace refractory Tips: You may also on the refractory fire brick, magnesia carbon brick, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.

There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.

Article Source: Thermal conductivity of refractory bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Thermal conductivity of refractory fire bricks

Chinafirebrick provides refractory products, magnesia carbon brick， calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory fire bricks rely on convection and steady state heat transfer, in the middle of the high temperature furnace if there are two refractory bricks, and there are two different temperatures there is a temperature difference. There will be heat transfer process we call heat transfer.

Refractory tiles convection heat is due to the movement of the internal particles of the fluid, the heat of the refractory brick from one to another. In the furnace refractory tiles heat transfer often encountered, when the fluid and refractory brick wall contact with the heat to the refractory wall or heat from the wall to the phenomenon of fluid.

Conduction heat transfer, also known as thermal conductivity, thermal conductivity is dependent on the thermal movement of micro-particles and the heat from the refractory high temperature zone to the low temperature area, or from the high temperature refractory brick to contact with the low temperature refractory brick process. In the hot environment, the temperature field of the temperature distribution in the interior of the refractory bricks is changed from time to time to the steady state temperature field.

Heat transfer rate: refers to the unit time through the heat transfer surface heat transfer.Heat flux: refers to the unit time through the unit heat transfer surface heat. Heat flux, also known as heat density.

Steady state heat transfer
The heat transfer process at which the temperature of the points in the heat transfer system varies only with the position and does not change with time. The process of steady state heat transfer is characterized by a constant heat transfer rate through the heat transfer surface.

Non - steady state heat transfer
In the non-steady state heat transfer system, the temperature along the points not only changes with the position, but also changes with time. In general, the heat transfer process of the intermittent production operation is non-steady state heat transfer.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
Article Source: Thermal conductivity of refractory bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Castables for reheating furnace

Heating furnace is used for rolling steel or forging steel billet or small steel ingot thermal equipment, the operating temperature below 1400 degrees. With the rapid development of refractory castables, more and more castables are used for reheating furnace, the most common used of them are as follows:.
(1) Self-flow castable
Applicable to the furnace structure is more complex, artificial can not vibrate the site. The maximum temperature of 1500 ℃, which is characterized by good thermal shock resistance, high refractoriness, construction is simple, almost no vibration.
(2) Refractory plastic
For the furnace roof, furnace wall face.
(3) Low cement castable
Applicable to the high temperature furnace, the temperature zone, the use of temperature between 1400 ~ 1500 ℃.
(4) Phosphate castables
It is suitable for the bottom of the furnace and other parts which are subject to friction and hot air scouring. The mixing degree is between 1000 and 1600 ℃. It is made of phosphoric acid or phosphate as the binder, aluminum cement and magnesite. A castable of a gelling agent.
(5) Mullite castable
High thermal shock resistance, erosion resistance, good corrosion resistance, good volume stability, high temperature, it is generally used in the furnace wall, roof and pressure beam and other key parts, or used to prefabricated burner brick.
(6) Anti-dry slag castable
It is suitable for the bottom of the furnace and the site where the iron oxide slag is deposited. The maximum temperature of up to 1600 ℃. Its main features are: high refractoriness, thermal shock resistance, and can be a good resistance to heating furnace iron oxide slag erosion.
(7) Light castable
Light castable for furnace wall, roof, flue and other parts of the insulation layer. High-strength lightweight castables can also be used as a working lining for smoke and hot air ducts.
Article Source:Castables for reheating furnace
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The application and requirements of refractory brick masonry

China refractory brick masonry construction, first of all, clear the construction tasks; secondly, do the "three check", that check personnel, check the material, check the scene; then, ready, remove the hidden dangers, reduce the problem; finally, In order to cope with possible accidents.

1. Careful analysis of drawings, a clear construction tasks, understand the design intent, to clarify the design requirements of each part and the main points.

2. Visit the design side, the supply side, the construction side, the application side of the leadership, to clarify the parties, the parties within the working relationship and organizational relations, the implementation of their respective responsibilities, clear what problems, who should solve. Changxing refractory to provide you with technical solutions.

3. Check the refractory raw materials, construction tools and auxiliary facilities into the site to confirm whether the varieties, specifications, quantity and quality meet the construction requirements. Whether the personnel and organizations involved in the construction meet the intended requirements.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick China, ladle & tundish nozzle, ceramic fiber with high quality for you.There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.
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Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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