In the sense that everything is chemicals, yes. But you typically wouldn't describe a butterfly growing a wing or a welder making a blue weld from metals that are normally very much not blue as "growing from chemicals". I guess you could argue about the butterfly, but I think few people would say that chemicals are involved in welding steel, despite iron, carbon and tungsten being chemical elements

The few people that would say that chemistry is part of welding "steel" (what type of steel? what type of metal? how about aluminium? etc) includes welders.

eg: https://youtu.be/nfNvuTMDXNg?t=1420

In which a good machinist from Queensland, Australia discovers a crack and states he'll have to get the metal tested before he can repair the crack.

You know, to match the chemical composition, expansion rates, etc.