Soft steel projectile

• US 5,686,693 A
• Filed: 02/12/1996
• Issued: 11/11/1997
• Est. Priority Date: 06/25/1992
• Status: Expired due to Fees

• Current Assignee: Bo Jakobsson
• Original Assignee: Bo Jakobsson
• Inventors: Jakobsson, Bo
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US08/600,301
• Time in Patent Office: 638 Days
• Field of Search: 102/501, 102/511, 102/514-518, 102/529, 102/524, 102/526, 102/527, 420/84
• US Class Current: 102/501
• CPC Class Codes: F42B 12/72 characterised by the material heat treatment for explosive shells C21D9/16
• CPC Class Codes: F42B 14/02 Driving bands; Rotating bands F42B14/04 takes precedence

Abstract

The projectile is made of a virtually lead free steel alloy containing tellurium. This projectile is more environmentally safe compared to conventional lead bullets. The tellurium in combination with a small amount of lead provides a steel alloy having a high machinability and good lubrication properties, thus reducing frictional wear inside a rifle bore when the bullet is passed therethrough. Additionally, a thin anticorrosive coating may be applied on the bullet. The coating may comprise a metal selected from the group consisting of copper, zinc and nickel. An additional lubricating coating comprising polytetrafluoroethylene may also be applied on the projectile. The projectile has a grooved guide section that is permitted to be deformed by the rifle bore without destroying the rifle bore when the projectile is fired in a rifle.

Claims

1. A small arms projectile comprising:

an elongate solid body made of a steel alloy;

the steel alloy containing from about 0.02 to about 0.04 percent by weight of tellurium and less than about 0.14 percent by weight of carbon;

the elongate solid body comprising;

a nose section, and

a guide section attached to the nose section, the guide section having circumferential rectangular grooves defined therein and circumferential rectangular lands disposed therebetween, the guide section having an anticorrosive coating applied thereon, the anticorrosive coating having a thickness from about 0.005 to about 0.1 millimeter, the circumferential rectangular lands having a first width and the circumferential rectangular grooves including a bottom surface having a second width, the first width being substantially equal to the second width.

2. A projectile according to claim 1 wherein the steel alloy contains lead and the lead content is from about 0.15 to about 0.35 percent by weight.

3. A projectile according to claim 1 wherein the anticorrosive coating comprises a metal selected from the group consisting of copper, zinc and nickel.

4. A projectile according to claim 1 wherein the anticorrosive coating comprises polytetrafluoroethylene.

5. A projectile according to claim 1 wherein an intermediate section is disposed between the nose section and the guide section, the intermediate section having a slanting front face, the front face forming an angle α

relative to a vertical axis of the solid body, the vertical axis being perpendicular to a longitudinal axis of the solid body, the angle α

ranging from about 25°

to about 35°

.

6. A projectile according to claim 5 wherein the angle α

is about 30°

.

7. A projectile according to claim 1 wherein the nose section has a dull outer nose portion.

8. A projectile according to claim 1 wherein the steel body has a hardness value of about 110 Brinell.

9. A projectile according to claim 1 wherein the thickness of the anticorrosive coating is from about 0.010 to about 0.015 millimeter.

10. A small arms projectile comprising:

a solid body made of a steel alloy;

the steel alloy containing from about 0.02 to about 0.04 percent by weight of tellurium and less than about 0.14 percent by weight of carbon;

the solid body comprising;

a nose section, and

a guide section attached to the nose section, the guide section having circumferential rectangular grooves defined therein and circumferential rectangular lands disposed therebetween, the solid body being insertable into a barrel defining a barrel bore, the solid body having a first diameter, the barrel having a helical land extending therethrough and defining a second inner diameter, the first diameter being greater than the second diameter, the circumferential rectangular grooves including a bottom surface having a first width and the circumferential rectangular lands having a second width, the first width being substantially equal to the second width,

an anticorrosive coating on the solid body, the anticorrosive coating having a thickness of between about 0.005 millimeter and about 0.1 millimeter, and

the land of the barrel having a hardness value that is greater than the hardness value of the solid body so that the land of the barrel is permitted to penetrate through the anticorrosive coating to shift a portion of the lands of the solid body into the grooves when the solid body is passed through the barrel bore and guided by the land of the barrel.

11. A small arm projectile comprising:

a solid body made of a steel alloy;

the steel alloy containing from about 0.02 to about 0.04 percent by weight of tellurium, from about 0.15 to about 0.35 percent by weight of lead and less than about 0.14 percent by weight of carbon, the solid body having a hardness value of about 110 Brinell;

the solid body being insertable into a barrel defining a barrel bore, the solid body having a first diameter, the barrel having a helical land extending therethrough so that the barrel bore has a second inner diameter, the first diameter being greater than the second diameter;

the solid body comprising;

a pointed nose section having a diameter;

a guide section attached to the nose section, the guide section having circumferential rectangular grooves defined therein and circumferential rectangular lands disposed therebetween, the guide section having a diameter that is greater than the diameter of the nose section, the grooves being adapted to engage the land disposed in the barrel bore, the circumferential rectangular grooves including a bottom surface having a first width and the circumferential rectangular lands having a second width, the first width being substantially equal to the second width;

an intermediate section disposed between the nose section and the guide section, the intermediate section having a slanting front face, the front face forming an angle α

relative to a vertical axis of the solid body, the vertical axis being perpendicular to a longitudinal axis of the solid body, the angle α

ranging from about 25°

to about 35°

; and

an anticorrosive coating applied on the solid body, the coating having a thickness of between about 0.010 millimeter and about 0.015 millimeter, the solid body having a hardness value that is greater than a hardness value of the anticorrosive coating, the land of the barrel having a hardness that is greater than the hardness value of the solid body and the anticorrosive coating so that the land of the barrel is permitted to penetrate through the anticorrosive coating to shift a portion of the lands of the solid body into the grooves when the solid body is passed through the barrel bore and guided by the land of the barrel.