Chromium hot work steel
AssigneeLatrobe Steel Company
InventorsJames L. Maloney, William P. Edwards, Mark S. Rodney
Life of this patent
Estimating the term…
Abstract
A modified H-13 hot work die steel in which impact toughness and thermal fatigue resistance is greatly improved. The steel consists of in weight %: ______________________________________ Carbon (C): 0.34-0.40, Manganese (Mn): 0.25-0.45, Silicon (Si): 0.85-1.15, Chromium (Cr): 5.00-5.40, Nickel (Ni): 0.30 max, Molybdenum (Mo): 1.20-1.50, Vanadium (V): 0.31-0.52, Niobium (Nb): 0.02-0.09, Iron (Fe) and Incidental impurities: Balance ______________________________________ The steel also preferably includes about 0.01-0.20 weight % titanium (Ti) and is preferably subjected to premium quality treatment, including remelting and homogenization, either thermal or mechanical (by hot working).
Claims11
A heat resistant steel having improved high temperature impact toughness and thermal fatigue resistance consisting of, in weight %:
- ______________________________________ Carbon (C):
- 0.32-0.45, Manganese (Mn):
- 0.20-0.50, Silicon (Si):
- 0.80-1.20, Chromium (Cr):
- 4.75-5.50, Molybdenum (Mo):
- 1.10-1.75, Vanadium (V):
- 0.30-0.55, Niobium (Nb):
- 0.02-0.09, Titanium (Ti):
- an effective amount up to 0.2, Iron (Fe) and Incidental impurities:
- Balance. ______________________________________
A heat resistant steel having improved high temperature impact toughness and thermal fatigue resistance consisting essentially of, in weight %:
- ______________________________________ Carbon (C):
- 0.32-0.45, Manganese (Mn):
- 0.20-0.50, Silicon (Si):
- 0.80-1.20, Chromium (Cr):
- 4.75-5.50, Molybdenum (Mo):
- 1.10-1.75, Vanadium (V):
- 0.30-0.55, Niobium (Nb):
- 0.02-0.09, Titanium (Ti):
- 0.01-0.20, Iron (Fe) and Balance;
- Incidental impurities:
- ______________________________________
- said steel being subject to a remelting and homogenization treatment.
A process for producing a heat resistant steel having improved high temperature impact toughness and thermal fatigue resistance comprising the steps of:
- providing a steel consisting of, in weight %:
- ______________________________________ Carbon (C):
- 0.34-0.40, Manganese (Mn):
- 0.25-0.45, Silicon (Si):
- 0.85-1.15, Chromium (Cr):
- 5.00-5.40, Molybdenum (Mo):
- 1.20-1.50, Vanadium (V):
- 0.30-0.52, Titanium (Ti):
- an effective amount up to 0.2, Niobium (Nb):
- 0.02-0.09, Titanium (Ti):
- an effective amount up to 0.2, Iron (Fe) and Balance;
- Incidental impurities:
- ______________________________________
- remelting said steel;
- homogenizing said remelted steel;
- and
- hot working said remelted and homogenized steel.
A heat resistant steel having improved high temperature impact toughness and thermal fatigue resistance consisting of, in weight %:
- ______________________________________ Carbon (C):
- 0.37, Manganese (Mn):
- 0.4, Silicon (Si):
- 1.0, Chromium (Cr):
- 5.3, Molybdenum (Mo):
- 1.35, Vanadium (V):
- 0.38, Niobium (Nb):
- 0.035, Titanium (Ti):
- 0.03, Iron (Fe) and Balance. Incidental impurities:
- ______________________________________
A process for producing a heat resistant steel having improved high temperature impact toughness and thermal fatigue resistance comprising the steps of:
- providing a steel consisting of, in weight %:
- ______________________________________ Carbon (C):
- 0.34-0.40, Manganese (Mn):
- 0.25-0.45, Silicon (Si):
- 0.85-1.15, Chromium (Cr):
- 5.00-5.40, Molybdenum (Mo):
- 1.20-1.50, Vanadium (V):
- 0.30-0.52, Niobium (Nb):
- 0.02-0.09, Titanium (Ti):
- 0.01-0.20, Iron (Fe) and Balance;
- Incidental impurities:
- ______________________________________
- remelting said steel;
- homogenizing said remelted steel;
- and
- hot working said remelted and homogenized steel.
Dependencies are inferred from the claim text.