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  • ASTM T5 Tool Steel / 1.3265 / S18-1-2-10 / SKH4 / BT5
  • ASTM T5 Tool Steel / 1.3265 / S18-1-2-10 / SKH4 / BT5

ASTM T5 Tool Steel / 1.3265 / S18-1-2-10 / SKH4 / BT5

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Specification, Chemical & Mechanical Performance

ASTM T5 tool steel is one of tungsten high-speed tool steel. It belongs to ASTM A600, together with T1, T2, T4 Tool Steel etc. They are also in T group in ASTM A600 standard. AISI T5 high speed steel contains Cobalt with range 7.0~9.5%. AISI T5 steel has better high temperature performance, toughness and better cutting performance than ASTM T4 steel. Similar to T4 steel materials, T5 tool steels are also used for cutting tool, turning tool etc.


1.ASTM T5 Tool Steel Supply Range

T5 Steel Round Bar: diameter 2mm – 200mm
T5 Steels Flat: thickness 2-20mm x width 10-100mm
T5 Steel Plate: thickness 2-200mm x width 200-810mm
Surface Finish: Black, Rough Machined, Peeled, Turned or as per given requirements.


2.Relevant Steel Specifications of AISI T5 Tool Steel

Country USA German Japan British
Standard ASTM A600 DIN EN ISO 4957 JIS G4403 BS 4659
Grades T5/T12005 1.3265/S18-1-2-10 SKH4 BT5


3.AISI T5 Tool Steels and Equivalents’ Chemical Composition

ASTM A600 C Mn P S Si Cr V W Mo Co
T5 0.75 0.85 0.20 0.40 0.03 0.03 0.20 0.40 3.75 5.00 1.80 2.40 17.50 19.00 0.50 1.25 7.00 9.50
DIN ISO 4957 C Mn P S Si Cr V W Mo Co
1.3265/S18-1-2-10 0.72 0.80 0.40 0.03 0.03 0.45 3.80 4.50 1.40 1.70 17.50 18.50 0.50 0.80 9.00 10.00
JIS G4403 C Mn P S Si Cr V W Mo Co
SKH4 0.73 0.83 0.40 0.03 0.03 0.45 3.80 4.50 1.00 1.50 17.00 19.00 9.00 11.00
BS 4659 C Mn P S Si Cr V W Mo Co
BT5 0.75 0.85 0.40 0.35 0.35 0.40 3.75 4.50 1.75 2.05 18.50 19.50 1.00 9.00 10.00


4.High Speed Tool Steel T5 Mechanical Properties

  • Physical Properties of High Speed T5 Tool Steels
Property Density



Temperature T



Specific heat


J / kgK

Thermal conductivity



Electric resistance



Modulus of elasticity






Creep strain limit


(Rp1,0) N/mm2

Creep rupture strength


(Rp1,0) N/mm2

445 (≥) 839 (≥) 42 42 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 424 883 167 975
  • Mechanical Properties of HSS T-5 Steel
Properties Metric Imperial
Density 8.75 g/cm3 0.316 lb/in3
Properties Metric Imperial
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30458 ksi


5.Forging of ASTM T5 Tool Steel Materials

Hot forming temperature: 1150-900oC.


6.ASTM T5 Tool Steel Heat Treatment

  • Annealing of T-5 Steel 
    • Annealing is recommended after hot working and before re hardening
    • Heat the temperature to 850°C at a rate of no more than 220°C per hour.
    • Hold at the temperature for one hour per inch of thickness(at least two hours).
    • Cool slowly in the furnace or in air to ambient temperature.
    • The resultant hardness achieved should be Max 255HB or lower.
  • Stress Relieving

Stress relieving to remove machining stresses should be carried out by heating to 600-650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

  • Hardening of Steel T5
    • Preheat T5 tool steel slowly to the temperature of 820-870°C.
    • Heat to the final hardening temperature of 1250°C and make sure the material must be heated through.
    • Quench in the warm oil,and then complete the quench in air.(care must be taken at this step)
  • Tempering of T-5 Steel

Tempering temperature: 550-590oC.

Tempering Temperature (oC) vs. Hardness (HRC)

100oC 150oC 200oC 250oC 300oC 350oC 400oC 450oC 500oC 550oC 600oC 650oC
64 64.5 63 62.5 62 62 62.5 63.6 64.8 66 64 60


7.Applications of ASTM/AISI T5 Tool Steel

ASTM T5 high speed steels are generally used as cutting tools, broaches and cold extrusion punches, turning blades, punchers, metal working blades.

Typical applications are:

  • Drills,
  • Milling Cutters,
  • Thread Cutting Tools,
  • Knurling Tools,
  • Cold extrusion punches
  • Broaches etc.

Besides AISI T5 high speed tool steel, we could also supply you T1, T2, T4, T10, T15 tool steel. Just send us your requests and have our best T5 tool steel price and other HSS tool steel offer.