D512                        

According with GB EDCr-B-03

Introduction: D512 is a kind of 2Cr13 valve surfacing electrode with lime-titania type coating. AC/DC. It has excellent welding performance. The weld metal is 2Cr13 martensitic high-chrome steel. The surfacing layer can be hardened in the air. Generally it does not need heat treatment. It has uniform hardness. It can also be softened under 750-800℃. When heated to 900-1000℃, it can be hardened again by air cooling or oil quenching.

Applications: D512 is a kind of universal electrode used for surface overlaying. The surfacing layer is harder, more wearable and rigider than D502. Used for surfacing carbon steel or low-alloy steel axles, valves for overheated steam, blades of mixers, blades of screw conveyers, etc.

Chemical Composition of Deposited Metal (%)

Hardness of Surfacing Layer: （Cooled in the Air after Welding）HRC≥45（Softening-resistant to500℃）

Reference Current (AC, DC)

Instructions:
1.The electrodes must be baked under about 150℃ for an hour before welding.
2.The work pieces should be preheated to over 300℃ before welding, and different heat treatment after welding may produce corresponding hardness.