Abstract:By adopting the alloy wire of Ni80Cr20as the welding core and adding the alloy elements of B, Si, Mo and W into the outer-plating covering, a new type of wear-resistant overlay welding rod of Ni-Cr-B-Si was developed. This overlay welding rod has several properties such as low melting point and good fluidity. With low content of W and Mo, the wearability and crack resistance of the overlay welding rod can be increased, and the hardness can be increased to about HRC64. This kind of overlay rod has been applied to the overlay of wearable workpieces, such as the valves of high temperature, high pressure and the side plates of floor-boarding brick-die.

Key words: Ni-Cr-B-Si; wear resistant alloys; overlay; welding rod