... : B,Si,C,Al,P,S Ferro boron is applied to iron making, foundry and used as boron element additive in ... we just need ultra low volume of boron to improve hardenability obviously to replace a great deal of alloy element. In addition, it ... bagDelivery Detail:25days from reiveing L/C or TT deposit A grade Ferro Boron SIZE:5-100MM 90%MIN