00Cr21Ni57Mo13W3 alloy came out in 1982, which is an improvement and development of the above-mentioned high-molybdenum Ni-Cr-Mo alloys. Considering that the chromium content of the above two (Hastelloy C-276 and C-4) Ni-Cr-Mo corrosion-resistant alloys is low (about 16%), and the HastelloyC-4 alloy does not contain tungsten, and the corrosion resistance in some media is reduced, the newly developed 00Cr21Ni57Mo13W3 alloy series increases the chromium content to about 21%, reduces the molybdenum content to about 13%, and adds an appropriate amount of tungsten (about 3%), so that the amount of alloy chromium, molybdenum and tungsten reaches a balance.
It is precisely because of these characteristics that the corrosion resistance of 00Cr21Ni57Mo13W3 alloy is better than that of the above-mentioned Ni-Cr-Mo(-W) alloys in many media. It is especially obvious in oxidizing media such as FeCl3 and CuCl2, wet chlorine, and oxidative-reducing acids. At the same time, the alloy still has excellent resistance to pitting, crevice corrosion and stress corrosion. Due to its low carbon and sulfur content, it is ideal for corrosion-resistant welding equipment, vessels, and pipelines in the chemical industry without the risk of sensitization.
00Cr21Ni57Mo13W3 chemical composition and tissue characteristics
The corrosion resistance of 00Cr21Ni57Mo13W3 alloy and the results compared with other alloys
Pitting resistance of 00Cr21Ni57Mo13W3 alloy
Stress corrosion resistance of 00Cr21Ni57Mo13W3 alloy
00Cr21Ni57Mo13W3 Mechanical properties of alloy sheet and plate weldments
Hardness of 00Cr21Ni57Mo13W3 alloy
00Cr21Ni57Mo13W3 heat treatment
After cold and hot processing of 00Cr21Ni57Mo13W3 alloy, the solution treatment process is quenching after heating and heat preservation at 1120C.
00Cr21Ni57Mo13W3 application
00Cr21Ni57Mo13W3 is a relatively new corrosion-resistant alloy. It is mainly used in seawater, acetic acid, acetic anhydride, chlorination and hydrogen fluoride systems, pickling equipment for phosphoric acid and mixed acid production, plate heat exchangers, SO2 cooling towers and other applications to solve the problems of comprehensive corrosion, pitting corrosion, crevice corrosion and so on. It is especially suitable for media containing both large amounts of chloride ions and large amounts of oxidants.