Yes about 30 rounds.....
There some issues 20-25 years ago with one of the gunbarrel makers using stressproof in smokeless powder rifle barrels. Barrels were bursting. But I don't know that stress proof is 1144.
I also could not find anything to support the sudden brittleness of 1144 as one person alleged. He made the statemne t but offered no proof. But then I am no metallurgist and the numbers could be right in front of my nose. I have yet to see anything that tells me that we shouldn't be using 1144 for our golf ball mortars. Charges are small, pressure is low, metal walls are thick. I'm shooting mine!
Here is the Data from
La Salle Steel.
Carbon Steels 1144
Related Metals:
HR-Penn(tm)
Clean Cut 45(tm)
Fremax 45(tm)
Specifications:
ASTM A29
ASTM A311
ASTM A510
SAE J1397
SAE J403
SAE J412
UNS G11440
Chemistry Data
Carbon
0.4 - 0.48
Manganese
1.35 - 1.65
Phosphorus
0.04 max
Sulphur
0.24 - 0.33
General Information
Physical Data
Density (lb / cu. in.)
0.283
Mechanical Data
Form
Bar-Round
Condition
Cold Drawn
Temper
68
Tensile Strength
125
Yield Strength
100
Elongation
12
Reduction of Area
34
Brinnell
269
Compare with 12L14 a common steel used in Muzzleloading gun barrels used with black powder
Carbon Steels 12L14
Related Metals:
Penn-Lead(tm)
Tull-Led(tm)
Xtrocut 300(tm)
Specifications:
ASTM A576 (12L14)
SAE J1397 (12L14)
SAE J403 (12L14)
SAE J412 (12L14)
UNS G12144
Chemistry Data
Carbon
0.15 max
Iron
Balance
Manganese
0.85 - 1.15
Phosphorus
0.04 - 0.09
Sulphur
0.26 - 0.35
General Information
Principal Design Features
12L14 is considered to be one of the fastest machining bar products produced today
Machinability
12L14 is rated at 190% of 1112. Its machinability is a direct result of a fine dispersion of lead particles throughout the alloy.
Physical Data
Density (lb / cu. in.)
0.283
Mechanical Data
Form
Bar-Round
Condition
Cold Drawn
Temper
68
Tensile Strength
78
Yield Strength
60
Elongation
10
Reduction of Area
35
Brinnell
163
...and 4140 the traditional Gun steel.
Yes about 30 rounds.....
There some issues 20-25 years ago with one of the gunbarrel makers using stressproof in smokeless powder rifle barrels. Barrels were bursting. But I don't know that stress proof is 1144.
I also could not find anything to support the sudden brittleness of 1144 as one person alleged. But then I am no metallurgist and the numbers could be right in front of my nose. I have yet to see anything that tells me that we shouldn't be using 1144 for our golf ball mortars. Charges are small, pressure is low, metal walls are thick. I'm shooting mine!
Here is the Data from
La Salle Steel.
Carbon Steels 1144
Related Metals:
HR-Penn(tm)
Clean Cut 45(tm)
Fremax 45(tm)
Specifications:
ASTM A29
ASTM A311
ASTM A510
SAE J1397
SAE J403
SAE J412
UNS G11440
Chemistry Data
Carbon
0.4 - 0.48
Manganese
1.35 - 1.65
Phosphorus
0.04 max
Sulphur
0.24 - 0.33
General Information
Physical Data
Density (lb / cu. in.)
0.283
Mechanical Data
Form
Bar-Round
Condition
Cold Drawn
Temper
68
Tensile Strength
125
Yield Strength
100
Elongation
12
Reduction of Area
34
Brinnell
269
Compare with 12L14 a common steel used in Muzzleloading gun barrels used with black powder
Carbon Steels 12L14
Related Metals:
Penn-Lead(tm)
Tull-Led(tm)
Xtrocut 300(tm)
Specifications:
ASTM A576 (12L14)
SAE J1397 (12L14)
SAE J403 (12L14)
SAE J412 (12L14)
UNS G12144
Chemistry Data
Carbon
0.15 max
Iron
Balance
Manganese
0.85 - 1.15
Phosphorus
0.04 - 0.09
Sulphur
0.26 - 0.35
General Information
Principal Design Features
12L14 is considered to be one of the fastest machining bar products produced today
Machinability
12L14 is rated at 190% of 1112. Its machinability is a direct result of a fine dispersion of lead particles throughout the alloy.
Physical Data
Density (lb / cu. in.)
0.283
Mechanical Data
Form
Bar-Round
Condition
Cold Drawn
Temper
68
Tensile Strength
78
Yield Strength
60
Elongation
10
Reduction of Area
35
Brinnell
163
...and 4140 the traditional Gun steel.
Alloy Steels 4140
Related Metals:
Folder
Finkl 4140(tm)
Maxell Tooling Alloy(tm)
Specifications:
AISI 4140
AMS 6349
AMS 6381
AMS 6382
AMS 6390
AMS 6395
AMS 6529
ASTM A193 (B7, B7M)
ASTM A194 (7, 7M)
ASTM A29 (4140)
ASTM A320 (L7, L7M, L7D)
ASTM A322 (4140)
ASTM A331 (4140)
ASTM A506 (4140)
ASTM A513
ASTM A513 (4140)
ASTM A519 (4140)
ASTM A646 (4140)
ASTM A711
ASTM A752 (4140)
ASTM A829
SAE J1397 (4140)
SAE J404 (4140)
SAE J412 (4140)
UNS G41400
Chemistry Data
Carbon
0.38 - 0.43
Chromium
0.8 - 1.1
Iron
Balance
Manganese
0.75 - 1
Molybdenum
0.15 - 0.25
Phosphorus
0.035 max
Silicon
0.15 - 0.35
Sulphur
0.04 max
General Information
Principal Design Features
This is one of the chromium, molybdenum, manganese low alloy steels noted for toughness, good torsional strength and good fatigue strength.
Applications
4140 is used in a tremendous variety of applications, too numerous to mention here.
Machinability
Machinability of this alloy is good in the annealed condition. In the heat treated and quenched condition machining is best limited to finish grinding.
Forming
As with all the low alloy steels forming may be done by conventional methods with the alloy in the annealed condition. These alloys have good ductility, but are tougher than plain carbon steel and thus usually require more force, or pressure, for forming
Corrosion Resistance
This alloy is a steel and is not corrosion resistant. Protective coating must be used in corrosive, or water, environments.
Welding
Weldable by all of the conventional methods. Note that welding with the alloy in the heat treated condition will affect the mechanical properties and a post weld heat treatment may be needed.
Heat Treatment
This alloy is hardened by heating to 1550 F and quenching in oil. It is best to normalize the alloy by heating at 1675 F for a long enough time to permit thorough heating, followed by air cooling, prior to the hardening treatment.
Forging
4140 may be forged at 2200 F down to 1700 F.
Hot Working
Hot working, if required, may be done in the range of 1900 F to 1500 F.
Cold Working
The alloy readily cold works in the annealed condition by conventional methods.
Annealing
Annealing is done at 1600 F followed by slow furnace cooling.
Aging
Not applicable to this alloy.
Tempering
Tempering temperatures range from 400 F to 1200 F depending upon the hardness level desired. The lower the tempering temperature the greater the hardness of the alloy. For example tempering at 600 F gives a tensile strength of 225 ksi while tempering at
Hardening
Hardens by cold working, or heating and quenching - also see "Heat Treatment" and "Tempering".
Physical Data
Density (lb / cu. in.)
0.28
Specific Gravity
7.83
Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
0.114
Melting Point (Deg F)
2580
Thermal Conductivity
23
Mean Coeff Thermal Expansion
7
Modulus of Elasticity Tension
33
Mechanical Data
MSO currently has no data available for this grade