Sniper Country Duty Roster collective wisdom


Technical - Steel and receivers:


some comments about steel and receivers;

1) concerning forged vs. billet machined vs. cast;
if all else is equal (steel alloy choice, alloy purity,
reciever dimensions, heat treatment, etc) then forging,
if done right, has a strength and possibly a stiffness
advantage. if designed and implemented properly, the
anisotropy obtained via forging can substantially improve
performance. however, for consumer-grade stuff, the
aforementioned issues loom larger than forging vs. whatever.
people frequently get worked up over academic issues
when there are more important things to worry about
(like did that steel batch get contaminated with
somebodies lunch).

2) with a proper heat treatment process, any existing
stresses in the steel due to forging and/or machining
should be minimized by an annealling period before
the hardening cycle. and the casting process causes
stresses as well; due to uneven cooling, differing
temperatures result in differing thermal stresses in the
steel as it cools. again, annealing may be needed.
the main drive gears for large ships require anywhere
from weeks to months to cool when they are cast; otherwise,
the thermal stresses will crack them. just imagine the
stresses required to crack 1 or 2 tons of steel!

3) good performance requires a good design, good materials,
good processes, good tooling, and good workmanship. Murphy
always finds the weak link...

Ivanhoe <ivanhoe@mindspring.com>
USA - Friday, February 12, 1999 at 07:43:39 (ZULU) 


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