10Lb Welding Electrodes for hard-surfacing applications with a target Rockwell C hardness of 45

10Lb Welding Electrodes for hard-surfacing applications with a target Rockwell C hardness of 45

Based on the limited information available, it’s possible that these welding rods were designed for hard-surfacing applications with a target Rockwell C hardness of 45

“hard-sur.” likely refers to “hard-surfacing,” which is a type of welding used to build up wear-resistant surfaces on metal components.
“45RC” could be a reference to the Rockwell C hardness scale, indicating the desired hardness of the welded material.

Packaging:
“MIL-B-131F” suggests that these rods were manufactured to meet certain military specifications. MIL-B-131F is an old military specification for welding electrodes.
“Class I” could indicate a specific category or classification within the MIL-B-131F specification.
“Champion Packages Co” is likely the manufacturer or packaging company.
“Columbus, Georgia” could be the location of the manufacturer or distributor.
“FH2176” and “Lot No 1 May 1979” indicate the batch or lot number and the manufacturing date.