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STRESS RELIEF
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The CA6NM is a cast martensitic stainless steel. Typically, the casting is furnished in a heat treated condition prior to use. If any welding is performed on this material, it should be tempered after weld repairs, which the 590 deg C thermal treatment indicates, as such. The deg C/hr are heat up and cool down rates for the tempering heat treatment to minimize thermal stresses.
Is the turbine a used one ? Normally extensive welding is done to these used turbines to extend their useful life.Besides casting new runer blades and turbines, I have also done some rebuilding. The tempering cycle is carried out after welding as nicely explained by metengr.
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