I don't know what steel they use, but they are soft. One time I decided to make the supreme horseshoes of all time. Forged them out of 5160, hardened and tempered them. My horse rapidly developed a supreme fear of walking on sandstone. The hard shoes provided very little traction and it was like he was walking on ice. The soft shoes have much better grip. This is a long way from your question, but had to chip in. He got over it in a couple of years, but still took that first step real careful.