T-1 High Speed Tool Steel


T-1 is an air or oil hardening tool steel that is an excellent cutting tool material. It has a good combination of toughness and red hardness and is relatively easy to harden.

Analysis:

C CO CR MN MO NI P S SI V W
0.65 - 0.80 3.75 - 4.500.10 - 0.40 0.20 - 0.400.90 - 1.3017.25 - 18.75

Size Availability:

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

Applications:

BroachesDrillsHobs
Knurling ToolsLathe ToolsMilling Cutters
Nut PiercersPlaner ToolsReamers
Shaving ToolsTapsThread Cutting Tools

Designations:

AISI T1 High Speed Tool Steel-US
AFNOR 18-04-01-France
DIN 1.3355-Germany
UNI X 75 W 18 KU-Italy
JIS SKH2-Japan
B.S. BT 1-United Kingdom
ASTM A600-US
FED QQ-T-590-US
SAE J437-US
SAE J438-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging1700-2100° FSlow.Cool slowly in dry sand or in other insulating media.
Annealing1600-1650° FCool slowly at a rate of 35° F per hour to 1000° F.For best results, insulating media is desirable. Hold at temperature for 2 hours.
Stress Relieving1100-1300° FCool slowlyStress relieve after rough machining
Preheating1500-1550° FPreheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible.
Hardening2325-2375° F (furnace) 2275-2350° F (salt bath)Quench in air or warm oil. To minimize quenching strains, quench in salt at 1000° FFor maximum wear resistance, harden at 2375° F. For maximum toughness and high hardness, harden at 2275° F.
Tempering(See Chart)Double tempering is recommended. The usual tempering time is 2+2 hours. Recommended temperature is 1000-1075° F for cutting tools. 1100-1200° F for shock tools
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.