So I have a T16, and the previous owner removed (cut) all the track pins out and I got a pile of links.

I was wondering if there was anything special about the pins construction? Are they made out of mild steel or more unlikely tempered/ hardened steel. As I said I have none so now need to make about 360 of them. Any suggestions on sourcing data on length, thickness and grade of steel would be appreciated. I have a few from a universal but they are in terribly worn shape. This makes me think they are probably made the same, simple mild steel?