Physical properties of high carbon steel and aluminum alloy
High carbon steel has high strength and hardness, high elastic limit and fatigue limit (especially notch fatigue limit) after proper heat treatment or cold drawing hardening, and its cutting performance is acceptable, however, the welding performance and cold plastic deformation ability are poor. Due to the high carbon content, cracks are easy to occur during water quenching, so double-Liquid Quenching (water quenching + oil cooling) is mostly used, and oil quenching is mostly used for small section parts. This kind of steel is generally used in the state of medium temperature tempering or normalizing or surface quenching After quenching.
Aluminum Alloy has low density, but high strength, close to or over high quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and anticorrosion, and is widely used in industry, use is second only to steel. Some aluminum alloys can use heat treatment to obtain good mechanical properties, physical properties and corrosion resistance.
Aluminum Alloy to carbon steel is comfortable to ride. I don't know which consideration is based on? You are riding on the seat, and the material under the seat is not very good! !
In other words, the difference between the two materials mainly lies in the fact that the frame made of aluminum will be heavier in order to provide the same mechanical strength. Or make another view, for example, if the weight of the frame is similar, the mechanical strength of the frame made of aluminum will be weaker. But if it is only used for general transportation, there are more than aluminum ones.
Carbon steel has strong fatigue resistance. Aluminum Alloy is light and suitable for walking. There are both expensive and cheap ones. It has different uses.
There is no need to come to cross-country mountain, just riding on gentle roads and cities, aluminum alloy is enough.
Advantages and disadvantages of aluminum alloy frame bicycle and high carbon steel frame bicycle respectively:
1. Aluminum alloy frame has the advantages of light weight, good elasticity and good moisture resistance oxidizability. It is currently the mainstream material of a bicycle stand. Disadvantages: The cost is higher than that of high carbon steel, and the strength is not as good as that of high carbon steel.
2. High carbon steel frame has the advantages of high strength and low price. Due to the large weight, it is gradually replaced by aluminum alloy materials. Currently, only lower-end bicycles can adopt high carbon steel frames. Disadvantages: heavy weight, easy to rust in humid environment.
If we only compare carbon steel frame with aluminum alloy holder,
Carbon steel frame:
Advantages: good toughness, slightly strong shock absorption ability, good comfort
Disadvantages: it is the heaviest of all materials
Aluminum Alloy holder:
Advantages: lighter, good repairability, better strength
Disadvantages: the vibration is passed to people, and the comfort is not as good as carbon steel
Generally, the nominal high carbon ones are basically vegetable car now, almost no more than 1K. The entry-level steel frame is all chromium molybdenum steel. The common 4130, Renault 520 or pigeon tube (the model is not very well understood, so I won't give an example) is at least 853,953 grade steel frame cars.
Single material is actually meaningless, because generally high carbon steel is only used on vegetable car, just say the cheaper vegetable car finished product, aluminum alloy is generally better than high carbon steel. Lighter, not easy to rust. High carbon steel can be said to be the cheapest material for the frame.
Compared with high carbon steel frame and aluminum alloy frame, aluminum alloy frame is much better.
The high carbon steel frame is heavy and easy to oxidize and rust. The aluminum alloy frame is light in weight and flexible, and is not easily oxidized in the air.
At present, aluminum alloy has become the mainstream material of a bicycle stand and is widely used in the manufacture and use of various bicycles.
Aluminum Alloy hard
Light aluminum alloy does not mean that it has low strength. The weight reduction of the frame mainly depends on reasonable design, adopting materials with high hardness and toughness, and appropriately reducing materials to reduce weight, after that, we have to go through multiple tests to ensure that although the safety steel is hard, it lacks toughness, that is, it will be relatively brittle, and the shock absorption effect on the road surface is not good, unless it is a relatively high-end steel frame that is comparable to aluminum alloy. Aluminum Alloy has rigidity and toughness, and its shock absorption effect is of course better than steel.
Expanded content:
I. Aluminum alloy
1. Introduction
Aluminum Alloy is the most widely used non-ferrous metal structural material in industry and has been widely used in aviation, aerospace, automobile, machinery manufacturing, ships and chemical industry. With the rapid development of industrial economy, the demand for aluminum alloy welded structural parts is increasing day by day, which makes the research on the weldability of aluminum alloy further.
II. Steel
1. Introduction
Steel is a general term for iron-carbon alloy whose carbon content is between 0.02% and 2.11%. The chemical composition of steel can vary greatly. Steel containing only carbon elements is called carbon steel (carbon steel) or ordinary steel; In actual production, steel often contains different alloy elements according to different uses, for example, manganese, nickel, vanadium, etc. Human beings have a long history of application and research on steel, but until the invention of steel-making method berz in the 19th century, steel production was a work with high cost and low efficiency. Nowadays, steel has become one of the most used materials in the world with its low price and reliable performance, and is an indispensable component in construction industry, manufacturing industry and people's daily life. It can be said that steel is the material basis of modern society.
