US2012156085A1PendingUtilityA1
Blast Resistant, Non-Magnetic, Stainless Steel Armor
Individually held — no corporate assignee on recordPriority: Dec 14, 2010Filed: Dec 14, 2010Published: Jun 21, 2012
Est. expiryDec 14, 2030(~4.4 yrs left)· nominal 20-yr term from priority
C21D 8/02C21D 9/42C21D 6/002C21D 6/005C21D 8/0226C21D 8/0231C21D 8/0273C22C 38/58F41H 5/045C22C 38/001C22C 38/02C22C 38/42C22C 38/44C22C 38/54
22
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Claims
Abstract
An article of manufacture formed of an alloy having the following weight percent composition is described. Carbon 0.25 max. Manganese 14-20 Silicon up to 2.0 Phosphorus 0.05 max. Sulfur 0.5 max. Chromium 12-22 Nickel 3.5 max. Molybdenum 0.5-4 Copper 2.0 max. Nitrogen 0.2-0.8 Boron 0.06 max. The balance of the alloy is iron and the usual, inevitable impurities found in commercial grades of stainless steel alloys. Optionally, the alloy may contain niobium, titanium, vanadium, zirconium, hafnium, and tungsten in a combined amount of up to about 0.5%. An intermediate form of the article is armor plate made from the alloy. In accordance with another aspect of the present invention, the plate is shaped to form an armor part that is attached to a larger structure to provide resistance to an explosion fragments or a ballistic projectile.
Claims
exact text as granted — not AI-modified1 . A blast resistant armor article formed of a high strength, high toughness, stainless steel alloy having the following composition in weight percent, about
Carbon
0.25 max.
Manganese
14-20
Silicon
up to 2.0
Phosphorus
0.05 max.
Sulfur
0.5 max.
Chromium
12-22
Nickel
3.5 max.
Molybdenum
0.5-4
Copper
2.0 max.
Nitrogen
0.2-0.8
Boron
0.06 max.
said alloy optionally containing niobium, titanium, vanadium, zirconium, hafnium, and tungsten in a combined amount of up to about 0.5%; and the balance of the alloy is iron and usual impurities.
2 . An armor article as claimed in claim 1 wherein the article comprises plate made from the alloy.
3 . An armor article as claimed in claim 1 wherein the article comprises plate made from the alloy and said plate is shaped to form an armor part for attachment to a larger structure to provide resistance to damage from an explosion blast, an explosion fragment, or a ballistic projectile.
4 . (canceled)
5 . An armor article as claimed in claim 1 wherein the alloy comprises the following elements in weight percent,
Carbon
0.08 max.
Manganese
14-19
Silicon
1 max.
Phosphorus
0.05 max.
Sulfur
0.03 max.
Chromium
12-21
Nickel
3.5 max.
Molybdenum
0.5-4
Copper
2.0 max.
Nitrogen
0.2-0.8
Boron
0.06 max.
6 . An armor article as claimed in claim 1 wherein the alloy comprises the following elements in weight percent,
Carbon
0.05 max.
Manganese
15-18
Silicon
1 max.
Phosphorus
0.05 max.
Sulfur
0.03 max.
Chromium
14-19.5
Nickel
2.5 max.
Molybdenum
0.75-2.5
Copper
1.5 max.
Nitrogen
0.3-0.7
Boron
0.005 max.
7 . An armor article as claimed in claim 1 wherein the alloy comprises the following elements in weight percent,
Carbon
0.035 max.
Manganese
16-18
Silicon
0.75 max.
Phosphorus
0.05 max.
Sulfur
0.03 max.
Chromium
16-18
Nickel
1.5 max.
Molybdenum
1.0-2.0
Copper
1.0 max.
Nitrogen
0.4-0.6
Boron
0.005 max.
8 . An improved armor plate formed of a high strength steel alloy, wherein the improvement comprises the steel alloy consisting essentially of, about
Carbon
0.25 max.
Manganese
14-20
Silicon
up to 2.0
Phosphorus
0.05 max.
Sulfur
0.5 max.
Chromium
12-22
Nickel
3.5 max.
Molybdenum
0.5-4
Copper
2.0 max.
Nitrogen
0.2-0.8
Boron
0.06 max.
said steel alloy optionally containing niobium, titanium, vanadium, zirconium, hafnium, and tungsten in a combined amount of up to about 0.5%, and the balance of the alloy is iron and usual impurities.
9 . An improved armor plate as claimed in claim 8 wherein the steel alloy consists essentially of, in weight percent, about
Carbon
0.08 max.
Manganese
14-19
Silicon
1 max.
Phosphorus
0.05 max.
Sulfur
0.03 max.
Chromium
12-21
Nickel
3.5 max.
Molybdenum
0.5-4
Copper
2.0 max.
Nitrogen
0.2-0.8
Boron
0.06 max.
10 . An improved armor plate as claimed in claim 8 wherein the steel alloy consists essentially of, in weight percent, about
Carbon
0.05 max.
Manganese
15-18
Silicon
1 max.
Phosphorus
0.05 max.
Sulfur
0.03 max.
Chromium
14-19.5
Nickel
2.5 max.
Molybdenum
0.75-2.5
Copper
1.5 max.
Nitrogen
0.3-0.7
Boron
0.005 max.
11 . An improved armor plate as claimed in claim 8 wherein the steel alloy consists essentially of, in weight percent, about
Carbon
0.035 max.
Manganese
16-18
Silicon
0.75 max.
Phosphorus
0.05 max.
Sulfur
0.03 max.
Chromium
16-18
Nickel
1.5 max.
Molybdenum
1.0-2.0
Copper
1.0 max.
Nitrogen
0.4-0.6
Boron
0.005 max.
12 . A process for making armor plate comprising the steps of:
melting an alloy having the following weight percent composition, about
Carbon
0.25 max.
Manganese
14-20
Silicon
up to 2.0
Phosphorus
0.05 max.
Sulfur
0.5 max.
Chromium
12-22
Nickel
3.5 max.
Molybdenum
0.5-4
Copper
2.0 max.
Nitrogen
0.2-0.8
Boron
0.06 max.
said alloy optionally containing niobium, titanium, vanadium, zirconium, hafnium, and tungsten in a combined amount of up to about 0.5%, and the balance of the alloy is iron and usual impurities;
casting the alloy into a mold to form an ingot; and then
mechanically working said alloy ingot to form plate.
13 . The process claimed in claim 12 wherein the step of mechanically working the alloy ingot comprises the steps of:
hot working the ingot to form a slab;
hot working the slab to form the plate; and then
cooling the as-formed plate at a cooling rate that is fast enough to avoid substantial sensitization of the alloy; and
wherein the step of hot working the slab is performed such that the alloy receives a reduction in thickness selected to provide a combination of strength, hardness, and toughness in said plate after said cooling step sufficient to resist damage from an explosion blast, an explosion fragment, or a ballistic projectile, when tested in accordance with MIL-STD-662F.
14 . The process claimed in claim 13 wherein the step of hot working the slab comprises the steps of:
heating the slab to a starting temperature of about 1500-2000° F.; and then
reducing the thickness of the slab from the starting temperature down to a finish temperature of about 1100-1400° F.
15 . The process claimed in claim 12 wherein the step of hot working the alloy ingot comprises the steps of:
hot working the ingot to form a slab;
hot working the slab to form an intermediate thickness plate;
warm working the intermediate thickness plate to provide a final thickness plate; and then cooling the warm-worked plate;
wherein the step of warm working the intermediate thickness plate is performed such that the alloy receives a reduction in thickness selected to provide a combination of strength, hardness, and toughness in said final thickness plate after said cooling step sufficient to resist damage from an explosion blast, explosion fragment, or a ballistic projectile, when tested in accordance with MIL-STD-662F.
16 . The process claimed in claim 15 wherein the step of hot working the slab to intermediate thickness plate comprises the steps of
heating the slab to a start temperature of about 1700-2200° F.;
reducing the thickness of the slab from the starting temperature down to a finish temperature of about 1600-1900° F.; and then
cooling the intermediate thickness plate at a cooling rate that is fast enough to avoid sensitization of the alloy.
17 . The process claimed in claim 16 wherein after said cooling step, the alloy is annealed at about 1600-2350° F.
18 . The process claimed in claim 15 wherein the warm working step is carried out at a temperature of about 800-1200° F.
19 . The process claimed in claim 18 wherein after said warm working step, the final thickness plate is cooled at a cooling rate that is fast enough to avoid substantial sensitization of the alloy.Join the waitlist — get patent alerts
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