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General discussion => Gun Building => Topic started by: jerrywh on February 18, 2017, 02:04:26 AM

Title: 12L14 interesting facts.
Post by: jerrywh on February 18, 2017, 02:04:26 AM

 Eric's question about gun barrel steels got me curious. Here is an interesting set of specs on 12L14 steel that is being used commonly today for muzzle loading barrels.
As you can see there is a vast difference in hot rolled and cold rolled. What is of greatest interest to me is the elongation figures.
HOT ROLLED 12L14
Tensile Strength, Ultimate    395 MPa   57300 psi   
Tensile Strength, Yield    235 MPa   34100 psi   
Elongation at Break    22 %   22 %   
Reduction of Area    45 %   45 %   
Modulus of Elasticity    200 GPa   29000 ksi   Typical for steel
Bulk Modulus    160 GPa   23200 ksi   Typical for steel.
Poissons Ratio    0.29   0.29   Typical For Steel
Shear Modulus    80.0 GPa   11600 ksi   Typical for steel.
 
COLD ROLLED 12L14
Tensile strength    540 MPa    78300 psi
Yield strength    415 MPa    60200 psi
Bulk modulus (typical for steel)    140 GPa    20300 ksi
Shear modulus (typical for steel)    80.0 GPa    11600 ksi
Elastic modulus    190-210 GPa    27557-30458 ksi
Poisson's ratio    0.27-0.30    0.27-0.30
Elongation at break    10%    10%
Reduction of area    35%    35%
Hardness, Brinell

Title: Re: 12L14 interesting facts.
Post by: Scota4570 on February 18, 2017, 02:18:00 AM

I would guess the hot rolled would be better because it would make a ring instead of fragmenting? 

Title: Re: 12L14 interesting facts.
Post by: jerrywh on February 18, 2017, 02:23:04 AM

That would seem correct but it takes about 20,000psi more for it to give way. I haven't formed an opinion as yet.  I'm waiting for the smart guys to chime in.

Title: Re: 12L14 interesting facts.
Post by: Daryl on February 18, 2017, 07:42:25 AM

I'm going to go get another beer, thus I am waiting as well.

Title: Re: 12L14 interesting facts.
Post by: JCKelly on February 19, 2017, 12:24:34 AM

 Gentlemen, might I ask that you read my post  this afternoon, on  "So...Barrel Discussion Here?

Tensile strength is not the issue.