What is T1 High Speed tool steel ?

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AISI/ASTM T1 tool steel is one of the original tungsten high speed steels, although all tungsten steel grades are used to a limited extent because of the cost and questionable availability of tungsten. Of the T group steels, the general purpose T1 tool steels and the high-vanadium-cobalt T15 are most commonly used.
T1 high speed steel is an air or oil hardening tool steel which has good comprehensive performance. HSS T1 tool steel has a high hardness (HRC62~66), strength, toughness and heat resistance, which is an excellent cutting tool material. T-1 tool steel grade is on the whole used for turning, planning & slotting instruments, tapes, twist drill, threading dies, profile slicing instruments, broaching instruments & reamers.

Generally, high speed steels are divided into three groups:
  • Those bearing the symbol T where tungsten is the major alloying element;
  • Those bearing the symbol M indicating that molybdenum are the principal alloying element;
  • A group of more highly alloyed steels that is capable of attaining unusually high hardness values.
Here we have tool steel type T-1 with the chemical composition, physical, mechanical and thermal properties and other equivalents of T1 tool steels. Except T1 hss tool steel, we are also able to supply T2, T10, T-15 high speed steel etc.
1.High Speed T1 Tool Steel Supply Range
T1 Steel Round Bar:  diameter 2mm – 200mm
T1 Steel Flat: thickness 2-20mm x width 10-100mm
T1 Steel Plate: thickness 2-200mm x width 200-610mm
Surface Finish: Black, Rough Machined, Turned or as per given requirements.
2.Relevant Steel Specification of AISI T1 High Speed Tool Steels
CountryUSAGermanJapan
StandardASTM A600DIN EN ISO 4957JIS G4403
GradesT1HS18-0-1/1.3355SKH2
3.AISI T1 Tool Steel and Equivalents’ Chemical Composition Properties
ASTM A600CMnPSSiCrVMoWCo
T10.620.800.100.400.030.030.200.403.754.500.901.30……17.2518.75……
DIN ISO 4957CMnPSSiCrVMoWCo
HS18-0-1/1.33550.730.85……………0.653.604.501.001.20……17.2018.70……
JIS G4403CMnPSSiCrVMoWCo
SKH20.730.83…0.400.030.03…0.453.804.501.001.20……17.2018.70……
4.High Speed Steel T1 Tool Steel Mechanical Properties
  • Physical Properties of HSS T-1 Steels
PropertiesMetricImperial
Density8.67 g/cm30.313 lb/in3
  • Mechanical Properties of T-1 Steel
PropertiesMetricImperial
Hardness, Rockwell C63.0 – 65.063.0 – 65.0
Poisson’s ratio0.27-0.300.27-0.30
Elastic modulus190-210 GPa27557-30457 ksi
  • Thermal Properties of T1 Tool Steel
PropertiesConditions
T (°C)Treatment
Thermal expansion9.7 x 10-6/ºC20-200 more–
Thermal conductivity19.9 x W/m-K100 more–


5.Forging of AISI HSS T1 Tool Steel
  1. Preheat T1 high speed steel uniformly and slowly to 850-880°C.
  2. Increase the forging temperature for T-1 tool steel until 1050-1130°C.
  3. T1 hss tool steel should be cooled very slowly after forging.
6.AISI/ASTM T1 Tool Steel Heat Treatment and Properties
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)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.
2275-2350° F (salt bath)
Tempering1022 ° F-1058 ° FTemper T1 high-speed steel immediately after quenching. Hold for at least two hoursDouble 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
7.Applications of ASTM/AISI T1 Tool Steel
Generally, high speed steels are used for machining at high speeds. HSS T1 steel materials are widely used for:
  • Broaches
  • Drills
  • Hobs
  • Knurling Tools
  • Lathe Tools
  • Milling Cutters
  • Nut Piercers
  • Planer Tools
  • Reamers
  • Shaving Tools
  • Taps
  • Thread Cutting Tools
We are capable of supply top quality T1 tool steel high speed also in good price, you could send us enquiries of T1 steel and request the latest offer. And leave a comment if there are any queries.

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