What are the factors that determine the quality of aluminum?

by:Zeyi     2021-09-19
1. Alloying element   6063 alloy is an alloy prepared with aluminum, magnesium and silicon as the main elements. Each element has a certain range of content and the price of magnesium is high. In order to reduce costs, some manufacturers reduce the amount of magnesium to the minimum allowable content. Even worse, the magnesium content is lower than the minimum allowable content. Some factories add waste wires and waste aluminum pots to the alloy, basically not talking about 6063 alloy. As a result, the mechanical strength of the aluminum profile is very low, it can be so low that it can be easily bent with both hands, and it is commonly known as soft as noodles. This is one of the reasons why aluminum can be thousands of dollars cheaper. Regular aluminum manufacturers have internal standards when formulating alloy components, that is, within the range of various element content, each factory has its own smaller range of changes, and the ratio of aluminum, magnesium, and silicon is very strict. Each factory has its own data and keeps each other confidential. Only the alloy made with qualified formula can guarantee the quality, otherwise the quality will not be improved on how to process it in the future. 2. How to melt the 6063 alloy equipped with aluminum alloy melting furnace and what kind of furnace to use is also very important. Now domestic furnaces are used in the 1940s and 90s. The worst manufacturers use the original crucibles. boiler. There are coal-burning, oil-burning, gas-burning and electric heating smelting furnaces. Some stoves have chimneys, and some have no chimneys. Generally, square furnaces (rectangular furnaces) are generally used, and the advanced ones are round furnaces. Some round furnaces can be tilted to pour molten aluminum. In terms of tonnage, there are one, two, five, ten, twenty-five, and fifty-ton aluminum melting furnaces. More advanced, add a static furnace below the aluminum melting furnace, which is mainly used for preparing 6063 alloy, which can be used for slagging and degassing in this furnace, standing, and then casting aluminum rods for extrusion use. The quality of the alloy prepared in the original coal-fired furnace and the modern round furnace is absolutely different. Generally, furnaces should have a chimney no matter what fuel is burned. Most of the waste gas and slag produced during the combustion of the fuel can be discharged from the chimney. If all the flue gas and waste slag are melted in the aluminum water, so that the aluminum rod for extrusion is cast, there are serious slag bubbles inside, which is one of the reasons for the poor quality of aluminum and one of the reasons for the cheap aluminum price.  3, alloy casting  , the level of domestic casting equipment is also very different. The oldest domestic casting equipment is iron mold casting at the level of the 1940s, and the advanced one is hydraulic semi-continuous casting. The crystalline structure of iron mold casting rods is very poor, and there are a lot of slag and bubbles in the rods. The quality of the rods is very poor. Nowadays, horizontal casting (also known as continuous casting) and semi-continuous casting are commonly used in general factories. , Semi-continuous casting most of the wire rope transmission, the best hydraulic transmission. The length of semi-continuous casting rods varies, generally from 3 meters, 4 meters to 8 meters. Semi-continuous casting is a pit type. It is lowered while casting, and is cooled with cold water on all sides. Due to the uniform water cooling, the crystal structure of the casting rod is uniform and fine. However, the downward transmission of the steel wire rope is not as stable as the hydraulic transmission. The surface of the hydraulic casting rod is smoother than other casting rods. The smooth surface of the cast rod is one of the prerequisites for extruding a good profile. 4. Profile extrusion   There are many types of profile extrusion machines in my country, and the grades are very different. They are also the best in the world. There are the factory's own simple extruders, modified by plastic extrusion machines, and a small number of domestic ones, followed by most of them from Japan, the United States and Germany, with hydraulic and oil pressure. In short, hundreds of domestic extrusion presses are diverse. It is generally believed that Japanese, American, and German extruders are better. Good and bad extruders, the same cast rods, the quality of extruded profiles is never different. We often see 6063T5 used for building aluminum doors and windows, which is an American brand internationally used.   The Chinese brand is LD31RCS. Both T5 and RCS indicate the state, which means the air-cooled quenching artificial aging state. The quenching of metals is quenching when the high temperature suddenly drops to a low temperature. For example, the blade of a steel knife needs to be quenched in water to be hard and sharp. The quenching of aluminum also includes water-cooled quenching and air-cooled quenching. The 6063 profile used in construction is quenched by air cooling. The quenched aluminum is placed in an aging furnace for a certain period of time, the internal crystals of the aluminum are rearranged, and the mechanical strength is significantly improved. Among all the metal alloys, only aluminum alloy has a aging state.   The above are the four factors that determine the quality of aluminum materials collected by the editor, I hope it will be helpful to everyone.
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