Item Sponsored by National High Technology Research and Development Program of China(2007AA03Z509);National Science Foundation for Distinguished Young Scholars of China(50925522)
A 25CrMo48V steel for ultra-deep oil/gas well casings was quenched at 900-1 200 ℃ and tempered at 650 ℃. The lath martensitic structures were characterized by optical microscope (OM), field emission scanning elect...