High strength alloy steel compositions and process of producing high strength steel including hot-cold working

Claim 2

AN ALLOY STEEL CONSISTING ESSENTIALLY OF ABOUT 3 TO 12% OF METAL OF THE GROUP CONSISTING OF NICKEL AND COPPER, COPPER WHEN PERSENT NOT EXCEEDING ONE-HALF THE NICKEL CONTENT, 0.2 TO 7% COBALT, UP TO 2% EACH OF MANGANESE, CHROMIUM AND ALUMINUM, UP TO 1.5% SILICON, UP TO 3.5% MOLYBDENUM, UP TO 0.5% VANADIUM, UP TO 0.4% COLUMBIUM, UP TO 0.25% TANTALUM, UP TO 0.75% TUNGSTEN, UP TO 0.1% BORON, ( UP ) 0.1 TO 0.3% CARBON, AND THE BALANCE SUBSTANTIALLY ALL IRON.

Claim 3

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of at least one metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3% (.) , at least one of the elements nickel and cobalt being present on the high side of its range when at least one of the elements carbon, chromium and silicon is present on the high side of its range, and said steel as austenitized, quenched and tempered at about 400-1000*F. having yield and ultimate strengths of at least 150 and 180 k.s.i. respectively, a tensile elongation of at least 5%, and a Charpy V-notch impact strength at 70*F of at least 20 ft-lbs.

Claim 4

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of at least one metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3% (.) , at least one of the elements nickel and cobalt being present on the high side of its range when at least one of the elements carbon, chromium and silicon is present on the high side of its range, and said steel as austenitized, quenched and tempered at about 400-1000*F. having yield and ultimate strengths of at least 150 and 180 k.s.i. respectively, a tensile elongation of at least 5%, and a Charpy V-notch impact strength at 70*F of at least 20 ft-lbs.

Claim 5

(An alloy) A wrought alloy steel having a worked microstructure of transformed austenite selected from the group consisting of martensite and bainite, said steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum and columbium for carbon contents thereof over about 0.3%, and said steel having (a tempered martensItic microstructure,) yield and ultimate strengths of at least 150 and 175 k.s.i. respectively, (and) a tensile elongation of at least 5% (.) , a Charpy V-notch impact strength at 70*F of at least 20 ft-lbs.

Claim 6

(An alloy) A wrought alloy steel having a worked microstructure of transformed austenite selected from the group consisting of martensite and bainite, said steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum and columbium for carbon contents thereof over about 0.3%, and said steel having (a tempered martensItic microstructure,) yield and ultimate strengths of at least 150 and 175 k.s.i. respectively, (and) a tensile elongation of at least 5% (.) , a Charpy V-notch impact strength at 70*F of at least 20 ft-lbs.

Claim 7

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, (3) 6.5 to (12%) 9.5% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and said steel (having a martensitic microstructure, a tensile elongation of at least 5%, and yield and ultimate strengths of at least 150 and 175 k.s.i., respectively) as austenitized, quenched and tempered at about 400-1000*F having yield and ultimate strengths of at least 150 and 180 k.s.i. respectively, a tensile elongation of at least 5%, a Charpy V-notch impact strength at 70*F of at least 20 ft-lbs.

Claim 8

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, (3) 6.5 to (12%) 9.5% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and said steel (having a martensitic microstructure, a tensile elongation of at least 5%, and yield and ultimate strengths of at least 150 and 175 k.s.i., respectively) as austenitized, quenched and tempered at about 400-1000*F having yield and ultimate strengths of at least 150 and 180 k.s.i. respectively, a tensile elongation of at least 5%, a Charpy V-notch impact strength at 70*F of at least 20 ft-lbs.

Claim 9

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium, and columbium for carbon contents thereof over about 0.3%, and said steel having a bainitic microstructure, a tensile elongation of at least 5%, yield and ultimate strengths of at least 150 and 175 k.s.i., respectively, and a Charpy V-notch impact energy of at least (30) 20 ft/lbs. at 70*F.

Claim 10

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium, and columbium for carbon contents thereof over about 0.3%, and said steel having a bainitic microstructure, a tensile elongation of at least 5%, yield and ultimate strengths of at least 150 and 175 k.s.i., respectively, and a Charpy V-notch impact energy of at least (30) 20 ft/lbs. at 70*F.

Claim 11

An alloy steel consisting essentially of about: 0.2 to 0.65% carbon, (3) 6.5 to (12%) 9.5% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and said steel having a tempered martensitic microstructure, a tensile elongation of at least 5%, and yield and ultimate strengths of at least 195 and 230 k.s.i., respectively (.) , and a Charpy V-notch impact strength of at least 20 ft-lbs. at 70*F.

Claim 12

An alloy steel consisting essentially of about: 0.2 to 0.65% carbon, (3) 6.5 to (12%) 9.5% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and said steel having a tempered martensitic microstructure, a tensile elongation of at least 5%, and yield and ultimate strengths of at least 195 and 230 k.s.i., respectively (.) , and a Charpy V-notch impact strength of at least 20 ft-lbs. at 70*F.

Claim 13

An alloy steel consisting of about: (0.2) 0.1 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half thE nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and said steel having a substantially bainitic microstructure, a tensile elongation of at least 5%, an ultimate strength of at least 200 k.s.i., and a Charpy V-notch impact energy of at least 50 ft/lbs.

Claim 14

An alloy steel consisting of about: (0.2) 0.1 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half thE nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and said steel having a substantially bainitic microstructure, a tensile elongation of at least 5%, an ultimate strength of at least 200 k.s.i., and a Charpy V-notch impact energy of at least 50 ft/lbs.

Claim 15

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3% to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and wherein there may be substituted for part or all of any of the elements vanadium, aluminum and silicon, at least one element selected from the group consisting of titanium, zirconium and the rare earth metals (.) , said steel having as austenitized, quenched and tempered at about 400-600*F., yield and ultimate strengths of at least 235 and 280 k.s.i., respectively, and a tensile elongation of at least 5%.

Claim 16

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3% to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, up to 2% each of manganese, chromium and aluminum, up to 1.5% silicon, up to 3.5% molybdenum, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron, said steel containing at least 0.1% of at least one element selected from the group consisting of chromium, molybdenum, vanadium and columbium for carbon contents thereof over about 0.3%, and wherein there may be substituted for part or all of any of the elements vanadium, aluminum and silicon, at least one element selected from the group consisting of titanium, zirconium and the rare earth metals (.) , said steel having as austenitized, quenched and tempered at about 400-600*F., yield and ultimate strengths of at least 235 and 280 k.s.i., respectively, and a tensile elongation of at least 5%.

Claim 17

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of (the) metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, (0.25) 0 to 2% chromium, (0.25) 0 to 3.5% molybdenum, up to 2% each of manganese and aluminum, up to 1.5% silicon, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron (.) , said steel as austenitized, quenched and tempered at about 400-1000*F, having yield and ultimate strengths of at least 150 and 170 k.s.i., respectively, a Charpy V-notch impact strength at 70* of at least 30 ft-lbs, and a tensile elongation of at least 10%.

Claim 18

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 3 to 12% of (the) metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, (0.25) 0 to 2% chromium, (0.25) 0 to 3.5% molybdenum, up to 2% each of manganese and aluminum, up to 1.5% silicon, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron (.) , said steel as austenitized, quenched and tempered at about 400-1000*F, having yield and ultimate strengths of at least 150 and 170 k.s.i., respectively, a Charpy V-notch impact strength at 70* of at least 30 ft-lbs, and a tensile elongation of at least 10%.

Claim 19

An alloy steel consisting essentially of about: 0.1 to 0.3% carbon, 3 to 12% of (the) metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, 0.5 to 1.5% each of chromium and molybdenum, up to 2% each of manganese and aluminum, up to 1.5% silicon, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron.

Claim 20

An alloy steel consisting essentially of about: 0.1 to 0.3% carbon, 3 to 12% of (the) metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, 0.5 to 1.5% each of chromium and molybdenum, up to 2% each of manganese and aluminum, up to 1.5% silicon, up to 0.5% vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron.

Claim 21

All alloy steel consisting essentially of about: 0.3 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, 0.25 to 0.5% each of chromium and molybdenum, up to 2% each of manganese and aluminum, up to 1.5% silicon, up to 0.5 % vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron.

Claim 22

All alloy steel consisting essentially of about: 0.3 to 0.65% carbon, 3 to 12% of metal of the group consisting of nickel and copper, copper when present not exceeding one-half the nickel content, 0.2 to 7% cobalt, 0.25 to 0.5% each of chromium and molybdenum, up to 2% each of manganese and aluminum, up to 1.5% silicon, up to 0.5 % vanadium, up to 0.4% columbium, up to 0.25% tantalum, up to 0.75% tungsten, up to 0.1% boron, and the balance substantially all iron.

Claim 23

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 6.5 to 9.5% nickel, 1 to 4% cobalt, 0.25 to 1.5% each of chromium and molybdenum, up to 1% each of manganese and silicon, up to 0.5% vanadium, and the balance substantially all iron.

Claim 24

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 6.5 to 9.5% nickel, 1 to 4% cobalt, 0.25 to 1.5% each of chromium and molybdenum, up to 1% each of manganese and silicon, up to 0.5% vanadium, and the balance substantially all iron.

Claim 25

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 6.5 to 9.5% nickel, 1 to 4% cobalt, up to 1% each of manganese and silicon, up to 1.5% each of chromium and molybdenum, up to 0.5% vanadium and the balance substantially all iron (.) , said alloy containing at least 0.1% of at least one element selected from the group consisting of Cr, Mo, V and Cb for carbon content over about 0.3%.

Claim 26

An alloy steel consisting essentially of about: 0.1 to 0.65% carbon, 6.5 to 9.5% nickel, 1 to 4% cobalt, up to 1% each of manganese and silicon, up to 1.5% each of chromium and molybdenum, up to 0.5% vanadium and the balance substantially all iron (.) , said alloy containing at least 0.1% of at least one element selected from the group consisting of Cr, Mo, V and Cb for carbon content over about 0.3%.

Claim 27

An alloy steel consisting essentially of about: 0.1 to 0.5% carbon, 8 to 10% nickel, 3.5 to 4.5% cobalt, up to 1% each of manganese and silicon, up to 0.5% vanadium, up to 1.5% each of chromium and molybdenum, the balance substantially all iron (.) , said alloy containing at least 0.1% of at least one element selected from the group consisting of Cr, Mo, V and Cb for carbon content over about 0.3%.

Claim 28

An alloy steel consisting essentially of about: 0.1 to 0.5% carbon, 8 to 10% nickel, 3.5 to 4.5% cobalt, up to 1% each of manganese and silicon, up to 0.5% vanadium, up to 1.5% each of chromium and molybdenum, the balance substantially all iron (.) , said alloy containing at least 0.1% of at least one element selected from the group consisting of Cr, Mo, V and Cb for carbon content over about 0.3%.

Claim 29

An alloy steel consisting essentially of about 0.1 to 0.5% carbon, 7 to 9% nickel, 2 to 4% cobalt, up to 1.5% each of chromium and molybdenum and the balance substantially all iron (.) , said alloy containing at least 0.1% of at least one element selected from the group consisting of Cr, Mo, V and Cb for carbon content over about 0.3%.

Claim 30

An alloy steel consisting essentially of about 0.1 to 0.5% carbon, 7 to 9% nickel, 2 to 4% cobalt, up to 1.5% each of chromium and molybdenum and the balance substantially all iron (.) , said alloy containing at least 0.1% of at least one element selected from the group consisting of Cr, Mo, V and Cb for carbon content over about 0.3%.

Claim 31

A steel having high yield strength and good notch toughness consisting essentially of .1-.3% carbon, .2-7.% cobalt, 3.-12.% nickel, .5-1.5% molybdenum and .5-1.5% chromium and the balance substantially iron except for residual and incidental impurities.

Claim 32

A steel having high yield strength and good notch toughness consisting essentially of .1-.3% carbon, .2-7.% cobalt, 3.-12.% nickel, .5-1.5% molybdenum and .5-1.5% chromium and the balance substantially iron except for residual and incidental impurities.

Claim 33

Low carbon age hardenable steel consisting essentially of in percentage by weight: carbon .1-.3, nickel 6.5-9.5, molybdenum .1-3.5, cobalt 1-4., manganese 2. max., phosphorous .04 max., sulfur 0.4 max., silicon 1.5 max., aluminum 2. max., with the balance iron and other elements which do not adversely effect the properties.

Claim 34

Low carbon age hardenable steel consisting essentially of in percentage by weight: carbon .1-.3, nickel 6.5-9.5, molybdenum .1-3.5, cobalt 1-4., manganese 2. max., phosphorous .04 max., sulfur 0.4 max., silicon 1.5 max., aluminum 2. max., with the balance iron and other elements which do not adversely effect the properties.

Claim 35

An alloy steel consisting essentially of about: 6.5 to 9.5% metal from the group consisting of nickel and copper, with copper not exceeding one half the nickel content, 1 to 4% cobalt, 0.5 to 1.5% each of chromium and molybdenum, 0.1% to under 0.3% carbon, balance iron.

Claim 36

An alloy steel consisting essentially of about: 6.5 to 9.5% metal from the group consisting of nickel and copper, with copper not exceeding one half the nickel content, 1 to 4% cobalt, 0.5 to 1.5% each of chromium and molybdenum, 0.1% to under 0.3% carbon, balance iron.

Claim 37

An alloy steel consisting essentially of about: 6.5 to 9.5% metal from the group consisting of nickel and copper, with copper not exceeding one half the nickel content, 1 to 4% cobalt, 0.25 to 0.5% each of chromium and molybdenum, 0.3 to 0.65% carbon, balance iron.

Claim 38

An alloy steel consisting essentially of about: 6.5 to 9.5% metal from the group consisting of nickel and copper, with copper not exceeding one half the nickel content, 1 to 4% cobalt, 0.25 to 0.5% each of chromium and molybdenum, 0.3 to 0.65% carbon, balance iron.