A look at the materials used, the aluminum profiles used for high-quality aluminum alloy doors and windows, thickness, strength and oxide film, etc., should comply with the relevant national standards, the wall thickness should be above 1.2 mm, and the tensile strength reaches 155 per square meter. Newton, the yield strength should reach 108 Newtons per square millimeter, and the thickness of the oxide film should reach 10 microns. If the above standards are not met, it is inferior aluminum alloy doors and windows, which cannot be used.
Second, the processing, high-quality aluminum alloy doors and windows, fine processing, installation, stress, good sealing performance, switch freely. Inferior aluminum alloy doors and windows, blindly selected aluminum profiles and specifications, processing rough and shoddy, sawing instead of milling, not installed according to requirements, poor sealing performance, switch is not free, not only leaking wind and rain and glass burst phenomenon, but also encountered When it comes to strong winds and external forces, it is easy to scrape or knock down the push-pull parts or the glass, causing damage to people.
Third, look at the price, under normal circumstances, high-quality aluminum alloy doors and windows due to high production costs, the price is about 30% higher than inferior aluminum alloy doors and windows. Some aluminum alloy doors and windows with a wall thickness of only 0. 6-0. 8 mm aluminum profiles, tensile strength and yield strength are much lower than the national standards, and the use is very unsafe.
Carburetant
Using the carburetant can make the most of the scrap steel and reduce using the pig iron. The content of carbon is very high. Its color is black.When the carburant is used in casting, the consumption of scrap steel can be greatly increased, and the consumption of pig iron can be reduced or pig iron is not needed. At present, most of the carburant is suitable for electric furnace smelting, and a small part of the carburant with particularly fast absorption speed is used for cupola. Charging method of electric furnace smelting, should be the carburant with waste steel and other materials into the casting, small dosage can choose to add on the surface of molten iron. But to avoid mass feeding into molten iron, in order to prevent excessive oxidation and carbon effect is not obvious and casting carbon content is not enough. The addition amount of the carburizing agent is determined according to the proportion of other raw materials and the carbon content. Different types of cast iron, according to the need to choose different types of carburant. The characteristics of carburant itself choose pure carbonaceous graphitizing substances, reduce excessive impurities in pig iron, the selection of carburant can reduce casting production costs.
Carburetant
Carburant As Friction Material,Coal Additives For Brake Pads,Anthracite Based Carbon Additive,Carburant For Cast Iron
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