O-1 Annealed
PACIFIC O1 is a general purpose, relatively non-performing grade which hardens from low temperatures (smaller tools and dies can be heated with a torch). When greater stability in heat treatment and/or wear resistance is required, consider PACIFIC A2. If machinability is of prime importance, consider Graph-Mo® (06).
Chemical Composition
Heat Analysis - ranges and limits %
C
.90
Mn
1.00
Cr
.50
W
.50
Forging:
Heat to 1800/1950°F, do not forge below 1550°F.
Annealing:
Heat to 1400/1450°F and hold 1 to 4 hours depending on part size, cool at a maximum rate of 40°F per hour to 1000°F (cooling rate below 1000°F is not critical). Typical annealed hardness is 183/212 HB.
Stress Relieving:
Heat to 1200/1250°F for 1 hour minimum at temperature and cool in air.
Hardening:
Preheat at 1200°F. Austenitize at 1450/1500°F for 10 to 30 minutes. Quench in oil to an expected hardness of 63/65 HRC.
Temperting (Drawing):
Temper at 350/500°F for an hour at temperature to approximate hardness of 62 to 57 HRC. Usually, when greater toughness is required than can be obtained by tempering above 500°F, it is customary to use a shock resisting tool steel such as PACIFIC S7.
Tempering Temperature °F
Approximate Hardness, HRC
300
63/65
350
62/64
400
61/63
450
60/62
500
58/60
600
55/57
700
51/53
800
48/40
900
44/47
1000
40/44
Shapes and Conditions Available
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Annealed Rounds through 12" Diameter
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SE® Flats & Squares from 1/2" through 1-1/2" Thickness