Nickel 201 is the low carbon version of Nickel 200 suitable for forming by deep drawing and spinning into combustion boats and the continuous stamping of strip into electronic components. The material is selected for caustic salt evaporators above 315 deg C ( 600 deg F) as the extended exposure of Nickel 200 above this temperature can lead to the formation of graphite. Nickel 201 will not form graphite after extended exposure to temperature providing carbonaceous materials are not in contact with it. The material is however subject to intergranular embrittlement by sulphur compounds above 315 deg C ( 600 deg F) such that machining fluids and external sources of sulphur need to be eliminated to prevent damage during fabrication and subsequent service. Nickel 201 is approved for pressure vessel service ( ASME VIII Div 1) to 1250 deg F.