Tinplate boxes are tin-wrapped iron. Due to the stability of tin, tinplate can be used in various packaging. Due to metallic texture, fashion and convenience, more and more people choose canned packaging. Tin has stable chemical properties and is not easy to corrode, so it can be tin plated. Only in this way can we ensure that some products in the package will not be affected and can be properly stored.

But tin is afraid of cold and hot, its melting point is very low, and it will soon become liquid in the fire. Therefore, tinplate packaging usually cannot burn at high temperature, because high temperature combustion will melt the outer tin coating, while the inner iron sheet has no protective effect, so the usually burned tin box will quickly rust and corrode. Tin is afraid of cold and begins to lose its ductility around 13 degrees. When the temperature drops again to about minus 30 degrees, the tin will become powder. You heard correctly, it will turn into powder. Moreover, this property of tin is easily contagious, and when good tin encounters tin that has formed a powder, good tin will become a powder. There is also the small hardness of tin, which can be easily broken. If the knife cuts through the tinplate skin, the patch inside will slowly be eroded away. Therefore, protecting tin can well protect tinplate from corrosion. That's why tinplate needs to be tinned. The tin plating solution used for tinplate tin plating now determines the degree of protection of tinplate.

Many steel major students have learned gray iron, one of pig iron, also known as cast pig iron, in the course of "Metal Science and Heat Treatment", with a carbon content of about 3% and a silicon content of about 2%. The section is dark gray, usually called gray iron.

What is the tinplate? What is the fracture like a horse? Is it also a kind of cast iron?

In fact, tinplate and gray iron are not the same thing at all. tinplate is not iron, but tinplate. If you don't mix in this circle, you may be brought into the ditch by gray iron.

Legend of the origin of the two tinplate

Tinplate is a tin-plated iron sheet on the surface. It is not easy to rust and is also called tin-plated iron. This kind of coated steel plate has been called "tinplate" for a long time in China. There are three legends about its name:

Legend 1: Introduced from Macau (MACAO), it is homophonic, hence the name tinplate, also known as Yangtie.

Legend 2: It is also rumored to be entered by the horse mouth of the Ali Department of Tibet, hence the name.

Legend 3: China used to use this tin-plated sheet to make the lamp cap of kerosene lamps, which is shaped like a horse's mouth, so it is called "tinplate".

Characteristics of 3 tinplate

(1) Environmental protection: tinplate cans are easy to oxidize and decompose, and are conducive to garbage classification and disposal, and can be recycled and reused.

(2) Safety: Good sealing and long product shelf life.

(3) Consumption: The iron can has good thermal conductivity, is easy to heat, and meets the needs of consumers. It has sufficient strength and hardness, is not easy to deform, and is more convenient to handle and store. The product has multi-level color and exquisite appearance to meet the visual enjoyment of consumers.

(4) Economy: suitable for mass continuous production, low investment cost, so that consumers can enjoy high-quality and inexpensive products.

Basic structure of 4 tinplate

Tinplate is the common name of electroplated tin sheet. The English abbreviation is SPTE ( SPTE : Steel Plate Tin Electrolytic ), which refers to a cold-rolled low-carbon sheet or steel strip plated with commercial pure tin on both sides. Tin mainly plays a role in preventing corrosion and rust. It combines the strength and formability of steel with the corrosion resistance, solderability and beautiful appearance of tin in one material, and has the characteristics of corrosion resistance, non-toxicity, high strength and good ductility.