High strength, high toughness steel welding compositions

Claim 2

A weld wire or filler metal composition for the welding of steels having high strength and high fracture toughness in the range of ultimate tensile strength of 220-270 Ksi, a tensile yeidl strength of 210-245 Ksi and a fracture toughness (K IC ) greater than 115 Ksi √inch, the steels having a composition that is compatibly weldable with the weld wire or filler metal composition, which consists essentially of respective concentrations in percents by weight of constituents as follows: 0.14-0.17 carbon, 1.8-2.2 chromium, 0.9-1.1 molybdenum, 12.0-14.5 cobalt, 9.0-10.5 nickel, and a deoxidizer selected from the class consisting of: (a) 0.015-0.035 aluminum, (b) 0.10-0.20 silicon, (c) a combination selected from among (a), (b) and 0.05-0.20 manganese, and (d) a combination selected from among 0.02-0.10 vanadium, 0.05-0.20 manganese, 0.010-0.035 aluminum, 0.01-0.20 silicon, and the remainder iron; said composition having its concentration of respective constitutents adjusted to produce in the weldment fusion zone an ultimate tensile strength of 210-240 Ksi, a tensile yield strength of 200-230 Ksi and a Charpy V-Notch absorbed energy of at least 35 foot pounds.

Claim 3

The composition of claim 1 wherein said deoxidizer consists essentially of: 0.05-0.15 percent by weight manganese; 0.015-0.025 percent by weight aluminum; and 0.1-0.20 percent by weight silicon.

Claim 4

The composition of claim 1 wherein said deoxidizer consists essentially of 0.015-0.035 percent by weight of aluminum.

Claim 5

The composition of claim 3 wherein said aluminum is present in a concentration within the range of 0.015-0.030 percent by weight.

Claim 6

The composition of claim 1 wherein said deoxidizer consists essentially of about 0.03 percent by weight aluminum and about 0.16 percent by weight of silicon.

Claim 7

The composition of claim 1 wherein said deoxidizer consists essentially of manganese, aluminum and silicon and the concentration is no more than about 0.10 percent by weight manganese, 0.015 percent by weight aluminum and 0.1 percent by weight silicon.

Claim 8

The composition of claim 1 wherein said deoxidizer includes 0.02-0.1 percent by weight vanadium and an additional deoxidizer selected from the class consisting of: (a) 0.010-0.020 percent by weight aluminum, (b) 0.1-0.2 percent by weight silicon, and (c) 0.05-0.15 percent by weight manganese, and (d) combinations thereof.

Claim 9

The composition of claim 7 wherein said concentration and said additional deoxidizer is selected from the class consisting of: (a) about 0.015 percent by weight aluminum, (b) about 0.15 percent by weight silicon, and (c) about 0.10 percent by weight manganese, and (d) combinations thereof.

Claim 10

The composition of claim 1 wherein said composition does not have either before or after welding any concentration of the following impurities in excess of the following concentrations: ______________________________________ Maximum Allowable Concentration (Percent by Weight unless Impurities otherwise noted) ______________________________________ titanium 0.01 sulfur 0.005 phosphorous 0.008 tin 0.002 lead 0.002 zirconium 0.002 boron 0.0005 rare earths 0.01 total nitrogen 30ppm* oxygen 50ppm* hydrogen 3ppm* ______________________________________ *ppm designating parts per million.

Claim 11

The composition of claim 1 in the form of a weldment that has respective concentrations of respective constituents within the ranges recited in claim 1.

Claim 12

The composition of claim 1 wherein said deoxidizer is selected from the class consisting of a combination of a plurality of the deoxidizers manganese, aluminum and silicon and the total concentration thereof does not exceed 0.3.

Claim 13

A weld wire or filler metal composition for the welding of steels having high strength and high fracture toughness in the ranges of ultimate tensile strength of 220-270 Ksi, a tensile yield strength of 210-245 Ksi and a fracture toughness (K IC ) greather than 115 Ksi √inch, the steels having a composition that is compatibly weldable with the weld wire or filler metal composition, which consists essentially of respective concentrations in percents by weight of consitutents as follows: 0.12-0.20 carbon, 1.8-2.2 chromium, 0.9-1.1 molybdenum, 12.0-14.5 cobalt, 9.0-10.5 nickel, and a deoxidizer selected from the class consisting of: (a) 0.015-0.035 aluminum, (b) 0.10-0.20 silicon, (c) a combination selected from among (a), (b), and 0.05-0.20 manganese, and (d) a combination selected from among 0.02-0.10 vanadium, 0.05-0.20 manganese, 0.010-0.035 aluminum, and 0.01-0.20 silicon, and the remainder iron; said composition having its concentration of respective constituents adjusted to produce in the weldment fusion zone an ultimate tensile strength of 210-250 Ksi, a tensile yield of 200-230 Ksi and a Charpy V-Notch absorbed energy of at least 30 foot pounds.

Claim 14

A weld wire or filler metal composition for the welding of steels having high strength and high fracture toughness in the ranges of ultimate tensile strength of 220-270 Ksi, a tensile yield strength of 210-245 Ksi and a fracture toughness (K IC ) greather than 115 Ksi √inch, the steels having a composition that is compatibly weldable with the weld wire or filler metal composition, which consists essentially of respective concentrations in percents by weight of consitutents as follows: 0.12-0.20 carbon, 1.8-2.2 chromium, 0.9-1.1 molybdenum, 12.0-14.5 cobalt, 9.0-10.5 nickel, and a deoxidizer selected from the class consisting of: (a) 0.015-0.035 aluminum, (b) 0.10-0.20 silicon, (c) a combination selected from among (a), (b), and 0.05-0.20 manganese, and (d) a combination selected from among 0.02-0.10 vanadium, 0.05-0.20 manganese, 0.010-0.035 aluminum, and 0.01-0.20 silicon, and the remainder iron; said composition having its concentration of respective constituents adjusted to produce in the weldment fusion zone an ultimate tensile strength of 210-250 Ksi, a tensile yield of 200-230 Ksi and a Charpy V-Notch absorbed energy of at least 30 foot pounds.