Medium-carbon steel slab continuous casting special slag

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Medium-carbon steel slab continuous casting special slag
Product description
Medium-carbon steel is in BaoJing reaction ingredients area, casting billet is easy to appear longitudinal crack defects, by choosing appropriate control protective slag crystallizing temperature, and crystal chromatography rate and viscosity, get proper heat flux, ensure slab even slow cold, realize the continuous casting slab of good medium-carbon steel surface quality.
The product model: LF-BRK-Z

Applicable kinds: 0.08 to 0.35% of the carbon content of carbon steel, low alloy steel, etc
Applicable section: (150 ~ 250) mm... (800 ~ 1600) mm
Applicable drawing speed: 0.7 ~ 1.5 m/min
Main physical and chemical indexes are as follows:

water

<0.5%

Particle size

0.15~1mm>90%

Cao/Sio2

0.95~ 1.35

Hemisphere point

950~1150℃

1300 ℃ melting speed

15~35S

1300 ℃ viscosity

0.08~0.25Pa.s

容重

0.5~0.9g/c㎡



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Q:Who knows about the fire endurance of A grade fireproofing glass doors?
Fire doors and windows are divided into grade A, B and C according to the real national situation, also the minimum fire endurance has been stipulated, namely, the minimum fire endurance of grade A is 1.50 h, that of grade B and C are 1.00 h and 0.50 h respectively. There are wooden fire doors and steel fire doors. The main purpose of it is to reach the time that fire resistance should last. But door closers are required to install. The fire endurance of A grade wooden fire doors should be no less than 90 min, and that of B grade fire doors should be no less than 60 min, that of C grade fire doors should be no less than 30 min! ! !
Q:What kind of fireproof material is used for steel structure?
Brushing or spraying the coating on the surface of steel structure to prevent burning and insulate heat. It also prevents undermining the rolled steel from rapid temperature elevation and avoid collapse of building for lose of supporting capacities. Agglutination material are classified as fireproof coatings for steel structures which is solvent based and Water-based steel structure fire retardant coatings. Fireproof coatings for steel structures which is solvent based are subdivided into fireproof coatings for steel structures which is solvent based with low benzene content and fireproof coatings for steel structures which is solvent based with high benzene content (TVOC≤600g / L, benzene ≤5g / kg). It can be divided by thickness. ultra-thin (CB) fireproof coatings (coating thickness ≤3mm), thin (B) fireproof coatings (3mm & amp; lt; coating thickness ≤7mm) and thick (H) steel structure fire retardant coating (7 mm & amp; lt; coating thickness ≤45㎜). The coating can be divided into non-intumescent fire retardant coating and intumescent fire retardant coating according to the the expansion properties. Slim (CB) and fire-resistant coating for steel structure and thin(B) fireproof coatings is intumescent fire retardant coating, thick (H) fire-resistant coating for steel structure is intumescent fire retardant coating. Unprotected steel structure has fire endurance of 0.25 hours.
Q:What refractories are resistant to fluorine gas?
It is recommended to use fused-quartz brick, which will produce hydrofluoric acid fluorine (an acidic gas) when water vapors. It is cheap. While it is recommended to use silica brick if it exceeds 1,200 degrees. So acidic refractory is an advisable refractory for using. It works well if the temperature is below 1200 degrees.
Q:Current development status of qualitative refractory materials.
Q:How to use fireclay?
Fire-resistant adhesive material is needed, its effect equals to the cement. Cement will certainly do.
Q:Can polystyrene foam color steel plate be used as decorative fireproofing material ?
As far as I am concerned, polystyrene foam color steel plate cannot be used as decorative fireproofing material. Because polystyrene flame retardant and non-flame retardant of the points, from the fire retardant is generally self-extinguishing. Polystyrene is the polymer synthesized by styrene monomer through free radicals polycondensation reaction. It is a transparent thermoplastic plastic. With above 100 ℃ glass transfering temperature,it is often used to make a variety of disposable container and disposable foam lunch box which have to withstand the boiling water temperature.
Q:What is the the best ratio of mortar in refractory cement?
The ratio of refractory cement are: M10 the ratio of cement and mortar: cement: Sand= 346kg: 1631kg M7.5 ratio of cement and mortar: cement: Sand =274kg: 1631kg M5 The mix proportion of cement and mortar: cement: Sand = 209kg: 1631kg M10 mix proportion of composite mortar: cement: Sand: Lime =306kg: 1600kg: 29kg M7.5 mix proportion of composite mortar: cement: Sand: Lime =216kg: 1600kg: 64kg M5 The mix proportion of composite mortar: cement: Sand: Lime =205kg: 1600kg: 100kg
Q:Who can tell me what is neutral refractory?
It is a material that can resist acidic and basic slag, flux and chemical erosion form other refractories at high temperatures. The main components include carbon, silicon carbide, aluminum oxide, chromium oxide and other trivalent oxides, such as carbon refractories and chrome refractories, etc. Strictly speaking, neutral refractories refer only to the carbonaceous refractories, including carbon brick and graphite silicon carbide products, etc. Sometimes, high alumina refractories with high Al2O3 content also belong to this material, such as some materials that are acidic but tend to be basic refractories, like sillimanite, mullite bricks and corundum bricks. Recently developed aluminum carbon bricks, zirconium carbon bricks alumina - silicon carbide - carbon bricks, silicon nitride bonded silicon carbide brick and so on are also neutral refractories. This material can be used in the bottom of blast furnace, the lining of hearth and bosh, and the lining of aluminum electrolytic cell, calcium carbide furnace, ferroalloy furnace, molten steel ladle, plating tank, reaction tank, and autoclave and so on.
Q:Who know about the knowledge of acid refractory material? Please explain in detail.
Abrasion resistance of fire resistance material depends on the material group and structural material. The abrasion resistance of dense single crystal materials depends on the hardness of mineral crystal. The higher the hardness, the more resistance the material is to abrasion. non mineral crystals with fine grain material has a high wear resistance. The abrasion resistance of materials is related to bulk density or porosity. Aluminium refractory material can resist a temperature as high as 700~900 degree within the elastic range. The higher the temperature, the lower the resistance. Abrasion resistance will be increased with elastic modulus as temperature increase. In many cases, refractory material will often cause a lot of harm due to mechanical abrasion.
Q:What are the fireproofing materials of the external wall included?
According to the external wall thermal insulation materials, the external insulation materials is in general divided into Class A and Class B. The A class is non-combustible material. The B class is combustible materials. The fire disasters of the CCTV building and Shenyang hotel are both caused by the B level materials. Generally, the A level material will be used, and some prices are even cheaper than the B-grade material. A level is roughly divided into thermal mortar, phenolic foam Board, rock wool board, foam cement board, and so on. I hope my answer will help you!

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