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| U.S Caliber .30 Carbine M-1 metalurgy http://www.yesterdaysweapons.com/phpBB3/viewtopic.php?f=20&t=6756 |
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| Author: | Gun Nut [ Sun Nov 16, 2008 7:17 pm ] |
| Post subject: | U.S Caliber .30 Carbine M-1 metalurgy |
From the same source as my Garand information, George Leonard Herter and Jaques P Herter circa 1963. Receiver and Bolt made of WD steel No.4140. Carbon .50% to .60% Manganese .70% to .45% (Note: thats the way its printed, the numbers may be juxaposed, or one may be inncorrect. Probably should read .45% to .70%) Phosphorus not over .40% Sulphur .04% to .09% Chromium .80% to 1.10% Molybdenum .15% to .25% Treatment for bolt. Normalize for machining. Preheat 700 degrees F. Oil Quench from 1550 degrees F. Temmper two hours at not less tha 375 degrees F. and not more than 450 degrees F. Rockwell Hardness must be C-48-54. Treatment for the receiver is the same as for the bolt; but temper for one hour at 350 dgrees F. to 450 degrees F. Rockwell Hardness must be C-38-45. Barrel steel WD No. 1350 special. Carbon .50% to .60% Manganese 1.35% to 1.65% Silicon .15% to .35% Resulphurized .04% to .10% Phosphorus not over .045% Treatment normalize before machining if needed. Oil quench 1350 degrees F. to 1375 degrees F. Temper not less than 2 hours at heat to physical properties specified in US Army Spec. 57-107-25. Tensile strength 110,000 pounds per square inch. Elongation in two inches. 18% minimum reductions in area 45% minimum. Brinell hardness 229-227. |
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