The iron contains alloying elements that enhance the high temperature thermal fatigue and {HEAD ~ hot oxidation resistance} in {TAIL ~ service} 
in
The iron contains alloying elements that enhance the high temperature thermal fatigue and { HEAD ~ hot oxidation resistance } in { TAIL ~ service }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL