I have a forging cylinder block from a nonstandard PH/ martensitic grade. PMI results show 15Cr-5Ni-1Mo-0.8Mn-0.2V with 35-39 HRC. I plan to do the spark test or take out a core sample to decipher whether this is a PH SS or fully martensite. The bores in the block are washed out due to sand erosion at ambient temperature and high pressure. Based on the block geometry, I would like to avoid PWHT and use a bore welder (i.e. boretech) to build up the bores and machine afterwards. ER630 would be good option but with no PWHT, I am not sure it will have enough hardness for wear resistance. Considering that bore welder likes to use solid wire 0.035" GMAW any suggestion on the welding wire to meet 35-40 HRC? I know that 625, 617 or 307 will get work harden during machining but not sure to what hardness level and what extent they are going to be wear resistant?
Your input would be much appreciated! Thanks.
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