1,materila:20CrNiSi 2,high quarlity,long life service 3,pass ISO9001:2008 certification 4,manufacture to customer's request 1,materila:20CrNiSi2,high quarlity,long life service3,pass ISO9001:2008 certification4,manufacture to customer's request We provide machinery parts processing services.we undertake the manufacture of fittings and complete equipments of mining, metallurgy, construction and ...