| 摘要 |
<p>Martensitic steel contains (in wt.%) 0.02-0.075 carbon, 0.1-0.6 silicon, 0.5-0.95 manganese, 0.08-0.25 sulfur, maximum 0.04 phosphorus, 12.4-15.2 chromium, 0.05-1.0 molybdenum, 0.2-1.8 nickel, maximum 0.15 vanadium, 0.1-0.45 copper, maximum 0.03 aluminum, 0.02-0.08 nitrogen, optionally up to maximum 2.0 further alloying elements, and a balance of iron. The steel has a ferrite content of less than 28 vol.% in the microstructure. An Independent claim is also included for a process for the heat treatment of the martensitic steel comprising annealing a steel block having the above composition to form and adjust the ferrite content in the microstructure, hot deforming four times, and soft annealing. Preferred Features: The steel contains (in wt.%) 0.80-0.95 manganese, 0.10-0.16 sulfur, 13.8-15.0 chromium, 0.8-1.0 nickel and 0.25-0.35 copper.</p> |
