... : B,Si,C,Al,P,S Ferro boron is applied to iron making, foundry and used as boron element additive in ... is 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