... International Approval: ISO9001 3.Alloy steel ,with heat treatment. Lumber conveyor chain with kinds of sizes up to your order .Our type ... market is USA,Europe,Middle-East,Asia and Africa etc. Conveyor chain is one of our main products.It's strictly produced ... by ISO/ANSI/DIN standard. Silent chain,leaf chain,roller chain,special chain,sprocket,couplingare also our main products.