Columbia Alloys are matched to the temperature reached by the drag chain in service. For lower temperature service, where the chain is heated to no more than 550° F, we recommend our H39 high strength alloy steel. This alloy is especially effective with our Xtend Process® overlay, in which a layer of high chromium white iron is applied to high wear areas. The Xtend Process overlay achieves a hardness of 700 HB, making it extremely abrasion resistant.
For higher temperatures, where the chain reaches between 550° F and 1100° F, experience has shown that our manganese steel is the best alloy choice. A layer of our high chromium carbide hardfacing can be applied to high wear areas of the manganese chain to increase wear life.