I thought that the disc on the circular saws metal. And the son said no

Where did he get that the disc can cut metal, all because of one case. I used the tool to create the formwork for the foundation, the walls of the old furniture were at hand, and I dismissed them, before that I removed all the metal fasteners. One missed how he was cut, did not even notice, accidentally discovered, so a thought arose.

Exploring the disc

I decided to see what marks are on the disk, everything is erased in front, but what is there on the back side?

Disassembled and found the marking "HW", And just then the son came up and asked what I was doing, and told him about his assumption. He immediately doubted, went online and found information, and he was right.

It turns out Tungsten Carbide Sintered Disc, the thing is cool and durable, but for cutting metal you need a disc with a polycrystalline diamond coating marked "DP».

Marking

By the way, I started looking at discs in online stores, but did not find any visible markings there, because they are all photographed from the front, and this mark, apparently, is on the back of everyone.

In the characteristic, this parameter is also not specified, but only information for cutting what material the disc is intended for. Such is the case, but I just wanted to work without fear of running into a nail.