Based on long years of experience in manufacturing, in order to prolong the service life of the liner or barrel liner, we developed our special new material OS02H, a kind of Nickel-Chromium-Tungsten alloy.

Nickel-Chromium-Tungsten alloy has excellent abrasion resistance and corrosion resistance. The increase of Cr content in the nickel-chromium alloy matrix contributes to the oxidation resistance, high-temperature resistance, and corrosion resistance of the alloy. At the same time, the addition of CrB is better than WC. The microhardness of CrB is as high as 4000-4200DPH, which is close to diamond. It is more conducive to improving the overall strength of the alloy. Due to the high density of WC (about 15.7g/cm3), while the matrix of nickel-chromium alloy is only about 8g/cm3, melting issues are caused by the uneven surface and depth of the alloy due to the easy segregation of WC. Therefore, the content and particle size of WC must be controlled.

For the Nickel-Chromium-Tungsten alloy (which we call OS02H), the hard phase increased to about 50%, whereas OS02 is only ten to thirty. Moreover, if the fusion is not sufficient, microscopic pores are relatively obvious, reflected by a Rockwell hardness (HRC) of only 52-55. In contrast, the Rockwell hardness of our OS02H alloy is HRC56-64 (conventional control is HRC58-60). The service life is 3-5 times longer than WR5 or CPM10V. The OS02H alloy, based on Ni60 and in accordance with foreign twin-screw working conditions, greatly improved hard phase carbides (containing tungsten carbide, chromium carbide, and other carbides), ensuring the nickel pool fully dissolves. Our Ni-Cr-W alloy layer reaching HRC64 is the best proof.