RQTSi5 Heat-resistant Material Boiler Grate Bar
Recently, many users have wanted to find better boiler grate bars. The material used for the ordinary boiler grate vice bar is HT150, which is gray cast iron and is a casting.
Today we share a material RQTSi5 boiler grate bar with a better quality and a more suitable price than HT150.
It can be used for Class II bituminous coal, ordinary coal, etc. If the fuel standard is specified, the boiler can replace the grate once every 1-2 years. Some customers do not want to replace the grate frequently because it will cause the boiler to stop, affect production, and bring certain economic losses.
The full name of RQTSi5 is ductile iron with 5% silicon content. The silicon content mainly plays a role in improving heat resistance and corrosion resistance. Its performance improvement is reflected primarily on the following aspects.
RQTSi5 Chemical Element Composition Content (%)
RQTSi5 Chemical Element Composition Content (%)
| Component | C | Si | Mn | P | S |
| Minimum Value | 2.4 | 4.5 | – | – | – |
| Maximum Value | 3.2 | 5.5 | 0.7 | 0.1 | 0.03 |
RQTSi5 Mechanical Properties
| Form | Test Temperature | Tensile Strength σb Mpa |
Hardness HBW |
| Casting | Room Temperature | ≥370 | 228~302 |
| Casting | High temperature short-term tensile strength: 67 | ||
| Casting | High temperature short-term tensile strength: 30 |
Follow is RQTSi5 used materials heat heat-resistant temperatures
|
RQTSi5 |
The heat-resistant temperature in the air furnace gas reaches 800°C. The silicon upper limit reaches 900°C. | Used for coal powder burner, furnace strip, radiation pipe, flue gate, heating furnace intermediate pipe frame |
Good Heat Resistance:
High silicon content contributes to the high heat resistance of the grate. RQTSi5 boiler grate bar contains a higher silicon (Si) element. Under high temperature conditions, silicon reacts with oxygen to form a dense silicon dioxide (SiO₂) protective film on the surface of the material. This protective film has excellent antioxidant properties and can effectively prevent oxygen from diffusing into the material, thereby significantly improving the material’s antioxidant capacity. In the incinerator, this chain grate is in the high-temperature combustion area for a long time.
The protective film can prevent the grate from being rapidly oxidized, avoid the decrease in material strength and structural damage caused by oxidation, and ensure that the grate can continue to work stably at high temperatures.
RQTSi5 Boiler Grate Bar Has Good Thermal Fatigue Resistance
When the chain grate boiler is burning in the furnace, the surface of the ordinary grate will experience frequent heating and cooling cycles, which are prone to thermal fatigue.
However, RQTSi5 has good thermal fatigue resistance, and its internal organizational structure can better adapt to changes in thermal stress when the temperature changes, and it is less prone to cracking.
The presence of silicon helps to reduce the thermal expansion coefficient of the material and reduce the thermal stress caused by temperature fluctuations, thereby reducing the initiation and expansion of cracks and extending the service life of the grate.
High Temperature Strength Maintenance:
The surface of RQTSi5 grate sheet can withstand a combustion temperature of about 900-950 degrees, and the furnace temperature of the boiler can accept about 1000℃. Some garbage combustion will also use grate sheets made of RQTSi5.
Under this high temperature conditions, the grate needs to have sufficient strength to support the weight of the garbage and maintain its own structural integrity. Here, RQTSi5 can still maintain a certain strength at high temperatures.
The alloy elements it contains interact with each other, enhancing the lattice structure of the material, making it less likely to soften and deform at high temperatures, and can stably bear the load of garbage to ensure the normal progress of the incineration process.
Good Corrosion Resistance
During the incineration process of the incinerator, acid will be produced. This requires the grate sheet to have acid and corrosion resistance. During the incineration process of garbage, various acidic and alkaline gases and substances will be produced, such as sulfur dioxide (SO₂), hydrogen chloride (HCl) and other acidic gases, as well as some alkaline ash. The alloy elements in RQTSi5 give it a certain acid and alkali corrosion resistance. Silicon can improve the passivation ability of the material. The oxide film formed on the surface can not only resist oxidation, but also resist the erosion of acid and alkali substances to a certain extent.
In addition, other alloy elements also work synergistically to enhance the material’s tolerance to different corrosive media and reduce the risk of grate corrosion. If you want to further improve the material, you can add MO elements to further improve the corrosion resistance and acid resistance of the grate.
If customers want better materials for garbage incinerator grate bars, we have more recommendations, such as alloy steel. We will describe and update in detail in the blog.
Chlorine Corrosion Resistance:
Garbage usually contains a certain amount of chlorine, which will produce highly corrosive chloride HCI during the incineration process. RQTSi5 has good resistance to chlorine corrosion. The protective film on its surface can prevent direct contact between chloride and the material matrix. At the same time, the chemical composition and organizational structure of the material itself enable it to remain relatively stable in a chlorine-containing environment, and it is not easy to suffer from serious corrosion damage, thereby ensuring the service life of the grate and the normal operation of the incinerator.
RQTSi5’s good heat resistance and corrosion resistance enable it to adapt to the harsh working environment in the incinerator, effectively withstand the dual test of garbage combustion and corrosion, and provide a reliable guarantee for the stable and efficient operation of the incinerator.
Many users said that after replacing the RQTSi5 material boiler grate bar that the RQTSi5 grate sheet is not only the savior of the incinerator, but it also performs well in the annealing furnace and heating furnace, and has first-class high-temperature strength and stability, so it is worth replacing.
We have our own foundry and foundry workshop, and we can add different chemical elements according to customer needs to meet the needs of users. Whether you are a new grate assembly or an old grate sheet replacement, we can meet your needs.
Please feel free to contact us for specific details regarding the replacement.
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