Abstract: A composite armor plate is disclosed. The composite armor plate includes a first layer made from an ultra-high hardness, high strength alloy that is bonded to a second layer made from a high fracture toughness alloy that also may have high strength. The composite armor plate according to the present provides a gradient of strength, hardness, and toughness. The composite armor plate according to the invention may also include third and fourth layers of different alloys that provide combinations of hardness, strength, and fracture toughness that are intermediate of the hardness, strength, and fracture toughness provided by the first and second steel layers. A method of making the composite armor plate is also disclosed.

Abstract: A steel alloy is disclosed that provides a unique combination of strength, toughness, and fatigue life. The steel alloy has the following composition in weight percent: C about 0.15 to about 0.30 Mn about 1.7 to about 2.3 Si about 0.7 to about 1.1 Cr about 1.85 to about 2.35 Ni about 0.5 to about 0.9 Mo + ½W about 0.1 to about 0.3 Cu about 0.3 to about 0.7 V + 5/9 × Nb about 0.2 to about 0.5 The balance of the alloy is iron, usual impurities, and residual amounts of other elements added during melting for deoxidizing and/or desulfurizing the alloy. A hardened and tempered steel article made from the alloy is also disclosed.

Abstract: A steel alloy having very high strength in combination with good ductility, impact toughness, and fracture toughness is disclosed. The alloy has the following weight percent composition. C 0.30-0.46 Mn 0.04 max. Si 0.03 max. P 0.003 max S 0.0010 max. Cr 1.65-2.90 Ni 10.5-13.0 Mo 1.2-3.4 Co 15.4-18.6 Al 0.01 max Ti 0.02 max. O 0.0010 max. N 0.0010 max. The balance is iron and usual impurities.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following broad weight percent composition. Element Broad C 0.35-0.55 Mn 0.6-1.2 Si 0.9-2.5 P 0.01 max. S 0.001 max. Cr 0.75-2.0? Ni 3.5-7.0 Mo + ½ W 0.4-1.3 Cu 0.5-0.6 Co 0.01 max. V + (5/9) × Nb 0.2-1.0 Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: An exemplary welding consumable according to the invention is provided and includes up to about 0.13 wt % carbon, about 0.3 wt % to about 1.4 wt % manganese, about 7.25 wt % to about 11.5 wt % nickel, about 0.6 wt % to about 1.2 wt % molybdenum, about 0.2 wt % to about 0.7 wt % silicon, up to about 0.3 wt % vanadium, up to about 0.05 wt % titanium, up to about 0.08 wt % zirconium, up to about 2.0 wt % chromium, and a balance of iron and incidental impurities.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following broad weight percent composition. Element Broad C 0.35-0.55 Mn 0.6-1.2 Si 0.9-2.5 P 0.01 max. S 0.001 max. Cr 0.75-2.0? Ni 3.5-7.0 Mo + ½ W 0.4-1.3 Cu 0.5-0.6 Co 0.01 max. V + (5/9) × Nb 0.2-1.0 Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: A steel alloy is disclosed that provides a unique combination of strength, toughness, and fatigue life. The steel alloy has the following composition in weight percent: C about 0.15 to about 0.30 Mn about 1.7 to about 2.3 Si about 0.7 to about 1.1 Cr about 1.85 to about 2.35 Ni about 0.5 to about 0.9 Mo + ½W about 0.1 to about 0.3 Cu about 0.3 to about 0.7 V + 5/9 × Nb about 0.2 to about 0.5 The balance of the alloy is iron, usual impurities, and residual amounts of other elements added during melting for deoxidizing and/or desulfurizing the alloy. A hardened and tempered steel article made from the alloy is also disclosed.

Abstract: A steel alloy is disclosed that provides a unique combination of strength, toughness, and fatigue life. The steel alloy has the following composition in weight percent: C about 0.15 to about 0.30 Mn about 1.7 to about 2.3 Si about 0.7 to about 1.1 Cr about 1.85 to about 2.35 Ni about 0.5 to about 0.9 Mo+½W about 0.1 to about 0.3 Cu about 0.3 to about 0.7 V+ 5/9×Nb about 0.2 to about 0.5. The balance of the alloy is iron, usual impurities, and residual amounts of other elements added during melting for deoxidizing and/or desulfurizing the alloy. A hardened and tempered steel article made from the alloy is also disclosed.

Abstract: An alloy is disclosed that provides a unique combination of very high strength, toughness, and ductility. The alloy can be characterized by the following weight percent composition. C 0.3-0.6 Mn 3.0-4.5 Si 1.0-2.0 Cr 0.6-2.5 Ni 0.6-5.0 Mo + ½W Up to 0.5 Cu 0.3-1.0 Co ?0.01 max. V + 5/9Nb 0.1-0.5 Ti 0.025 max. Al 0.025 max. Ca 0.005 max. N ?0.02 max. The balance is iron and the usual impurities, wherein the impurities include not more than about 0.03% phosphorus and not more than about 0.003% sulfur. The alloy is further defined by containing Si, Cu, V, and optionally Nb such that 2?(% Si+% Cu)/(% V+( 5/9)×% Nb)?34.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following weight percent composition. Element C 0.30-0.55 Mn ?0.6-1.75 Si 0.9-2.8 Cr 0.6-2.5 Ni 2.70-7.0? Mo + ½ W 0.25-1.3? Cu 0.30-1.25 Co ?0.01 max. V + ( 5/9) × Nb 0.10-1.0? Ti ?0.01 max. Al 0.015 max. Ca 0.005 max. The alloy further includes a grain refining element selected from the group consisting of 0.0001-0.01% Mg, 0.001-0.025% Y, and a combination thereof. The balance of the alloy is iron and the usual impurities found in commercial grades of steel alloys produced for similar use and properties. In this regard phosphorus is limited to not more than about 0.01% and sulfur is limited to not more than about 0.001%. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the weight percent composition set forth above.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following broad weight percent composition. Element Broad C 0.35-0.55 Mn 0.6-1.2 Si 0.9-2.5 P ?0.01 max. S 0.001 max. Cr 0.75-2.0? Ni 3.5-7.0 Mo + ½ W 0.4-1.3 Cu 0.5-0.6 Co ?0.01 max. V + (5/9) × Nb 0.2-1.0 Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: An exemplary welding consumable according to the invention is provided and includes up to about 0.13 wt % carbon, about 0.3 wt % to about 1.4 wt % manganese, about 7.25 wt % to about 11.5 wt % nickel, about 0.6 wt % to about 1.2 wt % molybdenum, about 0.2 wt % to about 0.7 wt % silicon, up to about 0.3 wt % vanadium, up to about 0.05 wt % titanium, up to about 0.08 wt % zirconium, up to about 2.0 wt % chromium, and a balance of iron and incidental impurities.

Abstract: A steel alloy is disclosed that provides a unique combination of strength, toughness, and fatigue life. The steel alloy has the following composition in weight percent. C about 0.15 to about 0.30 Mn about 1.7 to about 2.3 Si about 0.7 to about 1.1 Cr about 1.85 to about 2.35 Ni about 0.5 to about 0.9 Mo+½W about 0.1 to about 0.3 Cu about 0.3 to about 0.7 V+ 5/9×Nb about 0.2 to about 0.5 The balance of the alloy is iron, usual impurities, and residual amounts of other elements added during melting for deoxidizing and/or desulfurizing the alloy. A hardened and tempered steel article made from the alloy is also disclosed.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following weight percent composition. Element C 0.30-0.47 Mn 0.8-1.3 Si 1.5-2.5 Cr 1.5-2.5 Ni 3.0-5.0 Mo + ½ W 0.7-0.9 Cu 0.70-0.90 Co ?0.01 max. V + ( 5/9) × Nb 0.10-0.25 Ti 0.005 max. Al 0.015 max. Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties including not more than about 0.01% phosphorus and not more than about 0.001% sulfur. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following weight percent composition. Element C 0.30-0.55 Mn ?0.6-1.75 Si 0.9-2.8 Cr 0.6-2.5 Ni 2.70-7.0? Mo + ½ W 0.25-1.3? Cu 0.30-1.25 Co ?0.01 max. V + ( 5/9) × Nb 0.10-1.0? Ti ?0.01 max. Al 0.015 max. Ca 0.005 max. The alloy further includes a grain refining element selected from the group consisting of 0.0001-0.01% Mg, 0.001-0.025% Y, and a combination thereof. The balance of the alloy is iron and the usual impurities found in commercial grades of steel alloys produced for similar use and properties. In this regard phosphorus is limited to not more than about 0.01% and sulfur is limited to not more than about 0.001%. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the weight percent composition set forth above.

Abstract: An alloy is disclosed that provides a unique combination of very high strength, toughness, and ductility. The alloy can be characterized by the following weight percent composition. C 0.3-0.6 Mn 3.0-4.5 Si 1.0-2.0 Cr 0.6-2.5 Ni 0.6-5.0 Mo + ½W Up to 0.5 Cu 0.3-1.0 Co 0.01 max. V + 5/9Nb 0.1-0.5 Ti 0.025 max. Al 0.025 max. Ca 0.005 max. N ?0.02 max. The balance is iron and the usual impurities, wherein the impurities include not more than about 0.03% phosphorus and not more than about 0.003% sulfur. The alloy is further defined by containing Si, Cu, V, and optionally Nb such that 2?(% Si+% Cu)/(% V+(5/9)×% Nb)?34.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following weight percent composition. Element C 0.30-0.55 Mn ?0.6-1.75 Si ?0.9-2.8 Cr ?0.6-2.5 Ni 2.70-7.0? Mo + ½ W 0.25-1.3? Cu 0.30-1.25 Co ?0.01 max. V + (5/9) × Nb 0.10-1.0? Ti ?0.01 max. Al 0.015 max. Ca 0.005 max. The alloy further includes a grain refining element selected from the group consisting of 0.0001-0.01% Mg, 0.001-0.025% Y, and a combination thereof. The balance of the alloy is iron and usual impurities. Also disclosed is a hardened and tempered steel article having very high strength and fracture toughness and formed from the alloy set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following weight percent composition. Element C 0.30-0.47 Mn 0.8-1.3 Si 1.5-2.5 Cr 1.5-2.5 Ni 3.0-5.0 Mo + ½ W 0.7-0.9 Cu 0.70-0.90 Co ?0.01 max. V + ( 5/9) × Nb 0.10-0.25 Ti 0.005 max. Al 0.015 max. Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties including not more than about 0.01% phosphorus and not more than about 0.001% sulfur. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: A high strength, high toughness steel alloy is disclosed. The alloy has the following broad weight percent composition. Element Broad C 0.35-0.55 Mn 0.6-1.2 Si 0.9-2.5 P 0.01 max. S 0.001 max.? Cr 0.75-2.0? Ni 3.5-7.0 Mo + ½ W 0.4-1.3 Cu 0.5-0.6 Co 0.01 max. V + ( 5/9) × Nb 0.2-1.0 Fe Balance Included in the balance are the usual impurities found in commercial grades of steel alloys produced for similar use and properties. Also disclosed is a hardened and tempered article that has very high strength and fracture toughness. The article is formed from the alloy having the broad weight percent composition set forth above. The alloy article according to this aspect of the invention is further characterized by being tempered at a temperature of about 500° F. to 600° F.

Abstract: An age hardenable martensitic steel alloy is disclosed. The alloy has the following composition in weight percent. C 0.30-0.36 Mn 0.05 max. Si 0.05 max. P 0.01 max. S 0.0010 max. Cr 1.30-3.2? Ni 10.0-13.0 Mo ?1.0-2.70 Co 13.8-17.4 Ti 0.02 max. Al 0.005 max. Ce 0.030 max. La 0.010 max. The balance is iron and the usual impurities. The composition of this alloy is balanced to provide a unique combination of very high strength, together with good toughness, ductility, and resistance to fatigue.