heating {TAIL ~ the steel sheet} 7 to a temperature range from {HEAD ~ an Ac3 transformation point} to 1000° C.; and 
heating { TAIL ~ the steel sheet } 7 to a temperature range from { HEAD ~ an Ac3 transformation point } to 1000 ° C. ; and
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH