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NOREM
NOREM is a hardfacing material developed by Electric Power Research Institute (EPRI) to deal with radiation safety issues associated with the use of cobalt alloys in nuclear power station coolant systems (see stellite for a discussion of the problem). It is a solid-solution strengthened austenitic matrix with a continuous network of eutectic and non-eutectic carbides at the grain boundaries. It is intended to be deposited by various welding processes.
==Characteristics==
There are eight variants of NOREM currently available, depending on application and designated 02, 02A, 03A, 03B, 04A, 04B, 05A, 05B. A typical elemental composition is 60% iron, 25% chromium, 4.5% manganese, 4.0% nickel, 3.3% silicon, 2.0% molybdenum, 1.2% carbon. Earlier compositions included either significantly more manganese (12% in alloy 04) or significantly more nickel (8% in alloy M2).
These are extremely hard alloys. NOREM 02 is ten times as resistant as 308 stainless steel to cavitation erosion. They are essentially corrosion-immune under the conditions inside CANDU reactors and erode at about 200 micrograms per square centimetre per year under pressurized water reactor conditions. Due to the high hardness, the strength is relatively low: approximately yield strength and it fails at 0.6% elongation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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