Why are kitchen knives, sickles and hammers made of iron instead of aluminum?

First of all, the landlord should understand that casting kitchen knives, sickles, hammers and other substances is not

pure iron

There are many alloys, such as steel, pig iron and ferrous iron.

Ion pair

It is beneficial to human body, so using iron as a kitchen knife can supplement human body.

iron

Amount (iron is a semi-trace element), aluminum is slightly toxic, which will affect the intellectual development of the human brain, so it is generally not necessary to make kitchen utensils such as kitchen knives. In addition, the amount of iron on the market is relatively large, and the alloy smelting technology of iron is relatively mature, so iron is relatively cheaper than aluminum, and

ferroalloy

It is more wear-resistant than aluminum alloy, and because aluminum has strong activity, it is easy to be oxidized, while iron does not have this problem, and the alloy is safer.