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O-1

O-1 Oil Hardening Tool Steel

O-1 is a general purpose oil-hardening tool steel. It has good abrasion resistance and toughness for a wide variety of applications.

Analysis:


C

CO

CR

MN

MO

NI

P

S

SI

V

W
0.85 – 1.000.40 – 0.701.00 – 1.400.10 – 0.500.30 Max.0.40 – 0.60

Size Availability:

Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard

Applications:

Blanking DiesDrawing DiesExtrusion Dies
Form CuttersForming DiesGauges – Special
Lamination DiesMaster ToolsMolding Dies
Paper KnivesPrecision ToolsPunches
ReamersRoll Threading DiesScrew Dies
Sub-Press DiesTapsTrimming Dies

Designations:

DIN 1.2510-Germany
B.S. BO 1-United Kingdom
ASTM A681-US
FED QQ-T-570-US
SAE J437-US
SAE J438-US
UNS T31501-US
AISI O1 Tool Steel-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging1825-1925° FLime or ashes.Heavy sizes should be left to cool in vermiculite or in other insulating media.
Annealing1425-1475° FCool slowly in the furnace at a maximum rate of 35° F per hour to approximately 1110° F.Protect against surface decarburization using controlled atmosphere or by pack-annealing.
Stress Relieving1200-1250° FStress relieve after rough machining
Preheating1200-1250° FPreheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible.
Hardening1450-1500° FIn oil.Remove all forging or rolling skin prior to hardening. Temper immediately after hardening. Allow to cool to 125-150° F before tempering.
TemperingComplete equalization of temperature throughout the tools is essential for good results. Recommended temperature is 350-500° F.
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.

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