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28ft diameter ring for tank head and rotating at 90sec/rev. We've seen this pitting condition in the past with lesser quality materials. We've polished many heads in the past starting with the 24-36 grit abrasives. The polishing started with very little pressure.

We've used this grit for many years with no problems. We are not doing it wet. Could there be an issue with the metal?

When polishing 304 stainless with a 24 grit belt grinder, what could cause the stainless steel to flake off and produce divets and pits in the material? Any advice will be greatly appreciated.

Thank you.

Could 1" thick Nickel 200 in the hot rolled/ hot rolled condition cause problems with welding, such as an increased possibility of weld solidification cracking or HAZ liquation cracking? Thank you.

Thanks for all the help...

Filler metals SAW - electrod-flux combo F7A2-EM14K-H8 SMAW - E7018 FCAW - E71T-1C GTAW - ER70S-2 This is a customer spec requirement. CE for the base metal is .41 It is a customer requirement

I need to qualify a WPS and the PQR coupon needs to be 1" thick SA516 gr 70 material. The processes to be qualified are FCAW, SMAW, GTAW, SAW. The welds need to obtain Vickers hardness of 200HV or less without performing a PWHT. We have done tests in the past but we had hardness levels over...