Project Description

AISI T5 high speed tool steel manufacturers and suppliers, supplied in round bar,square bar,flat bar,plate,sheet and wire.AISI T5 Tool Steel is one of tungsten type high speed tool steel according to ASTM/A600 standard. Compared with AISI T4,it has higher cobalt with 8%,which makes higher temperature performance and better toughness.It also has high abrasion resistance and good cutting performance.The surface hardness can reach 68-70HRC after quenched.T5 high speed steel

1.Supply Form & Size & Tolerance

Round bar
ProcessCold DrawnHot RolledHot ForgedFree Forging
Flat bar
WidthMax 800mmMax 800mmMax 800mm
ProcessCold DrawnHot RolledHot Forged

Remark:Tolerance can be customized as per requests

2.Chemical Composition

ASTM A600T50.75-0.850.20-0.400.20-0.400.030.033.75-5.000.50-1.251.80-2.4017.5-19.07.00-9.50
DIN ISO 49571.32650.72-0.800.450.
GB/T 9943W18Cr4V2Co80.75-0.850.20-0.400.20-0.400.030.033.75-5.000.50-1.251.80-2.4017.50-19.007.00-9.50
JIS G4403SKH40.73-0.830.450.

3.Physical Property

Density ,g/cm38.75
Specific heat ,J/kg.K42
Thermal conductivity,W/mK34
Modulus of elasticity,kN/mm2424
Thermal expansion,20-100 ºC,untreated11.2 x 10^ -6 /ºC

4. Mechanical Property

Hardness, Rockwell C (Quenched at 1277°C ,Tempered at 552°C)63-65 HRC
Poisson's ratio0.27-0.30
Elastic modulus190-210 GPa


Pre heat the AISI T5 with two steps.First,heat slowly and uniformly to 650-750°C with a rate not exceeding 220°C per hour,second,heat more quickly to the forging temperature of 1000-1150°C.Re-heating is necessary when temperature below 950°C. Slow cooling in furnace after forging.


Annealing must be performed after hot working and before re-hardening.Heat the temperature to 820 to 870°C with a rate not exceeding 220°C per hour.Controlled slow cooling in furnace at 10 to 20°C per hour to approximately 550°C, followed by cooling in still air. Hardness after annealing 285Brinell, maximum.

7.Stress Relieving

It is recommended to stress relieve after machining and prior to hardening to minimise the possibility of distortion.Heat in a neutral atmosphere to the  temperature of 600 to 650°C, and  soak for approximately two hours,followed by slow cooling in the furnace.


Preheat T5 tool steel slowly to the temperature of 820-870°C,then heat uniformly to Austenitizing Temperature,for salt bath 1277°C,for Controlled atmosphere furnace 1288°C,followed by salt bath or thermal quenching or warm bath approx. 550°C.


Tempering should be carried out immediately after quenching. Heat slowly and uniformly to the tempering temperature 550-590°C,soak well not less than 2 hours(one hour per 25mm of total thickness).Triple tempering is recommended,hardness after tempering is Min 63HRC.

Tempering Temperature100150200 250300 350 400 450 500 550 600 650
Hardness (HRC)6464.56362.5626262.563.664.8666460


AISI T5 high speed steel is good for machining high strength steel,high temperature alloy,titanium alloys,casting alloy materials and other difficult-to-machine materials,and also is widely used in cutting tools,broaches,punches, turning blades,milling cutter,drill,and etc.

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