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Long-term laboratory exposure tests for various Cr and Ni content steels and Ni-base alloys were conducted at 650°C in a 60vol.%CO–26%H 2 –11.5%CO 2 –2.5%H 2 O gas mixture simulating syngas environments. Upon isothermal heating, alloys with 15% and 20% Cr had many pits on the surface after a brief exposure, while no pit was found on alloys containing of 60% Ni and more than...
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