Wear-Arc 40 is a coated electrode with a special core wire and the proper amount of alloys in the coating to produce a deposit of highly abrasive resistant chrome carbides in a matrix of iron and chromium. The use of a special core wire gives much better arc action and also allows the electrode to operate at higher current settings. Deposits resist galling and seizing, and take a high polish when subject to sliding abrasive action. The hardness and wear-resistant properties of this alloy are retained at temperatures up to 1000°F (538°C) which makes it suitable for many applications where intermittent high temperature service is involved. Wear-Arc 40 is designed for use on steel mill twist guides, steel mill entry guides, wire guides, conveyor chain, and agricultural tools. This electrode also gives excellent service on certain crushing and quarrying equipment where high abrasive wear is the primary wear factor. On many applications where heat and abrasion are the prime wear factors, Wear-Arc 40 alloy may be the most economical alloy. As illustrated in the temperature hardness chart, this alloy has excellent hardness at constant temperatures up to about 1000°F (538°C). In considering this alloy for a heat and abrasion application, a constant operating temperature must be estimated. For example, a steel mill guide block surface with Wear-Arc 40 withstands exposure to intermittent contact with hot billets of bars at temperatures of 1800-2000°F (982-1093°C). This is possible because sufficient time elapses between contacts to prevent a high temperature build-up. In this example, the constant operating temperature is only about 500°F (260°C)