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AISI 4150R Q&T SR<br />
HR<br />
(RESULPHURIZED, HOT ROLLED, QUENCHED AND TEMPERED,<br />
STRESS RELIEVED)<br />
4150R HR Q&T SR is a free-machining alloy steel that provides an outstanding com bination<br />
of heat treated properties and superior machinability. This alloy steel is manufactured under<br />
close quality control for uniformity to an ASTM grain size of 5 to 8. It is especially suitable<br />
for service applications where substantial strength, toughness and hardness are required.<br />
TYPICAL ANALYSIS AISI 4150<br />
Carbon (C) .47/.55<br />
Manganese (Mn) .75/1.35<br />
Silicon (Si) .15/.30<br />
Molybdenum (Mo) .15/.25<br />
Chromium (Cr) .70/1.10<br />
Sulphur (S) .06/.10<br />
Phosphorus (P)<br />
.035 MAX<br />
TENSILE STRENGTH<br />
approx. 110,000 lbs psi<br />
YIELD POINT<br />
approx. 85,000 lbs psi<br />
BRINELL HARDNESS 269-321<br />
ROCKWELL C 28-34<br />
ELONGATlON IN 2" 16%<br />
REDUCTION IN AREA 51%<br />
ROUNDS 1/2" - 10-1/2" Hot rolled, heat treated, stress relieved. BHN 262/311<br />
ROUNDS 11" - 20" Forged, heat treated, stress relieved. BHN 262/311<br />
ROUNDS 12" and up are not resulphurized.<br />
FLATS AND SQUARES Hot rolled, heat treated, machine straightened,<br />
stress relieved. BHN 269/321<br />
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