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JIS SKH3 | DIN S 18-1-2-5/1.3255 | ASTM T4/T12004 High Speed Steel

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engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel

Alloy Structural Steel, Alloy Tool Steel, Carbon Structural Steel, Carbon Tool Steel, Bearing Steel, Spring Steel ,Stainless Steel, Refractory Steel, Roll Steel, Pinion Steel. Additionally, the company also has the capacity to forge round steel, steel flat, square steel, module, shaft and roller


  • Quick Details

    1:T4 steel introduction

        AISI T4 tool steel is one of tungsten type high speed tool steel, which belongs to ASTM A600specification, the standard for high speed tool steel materials. T4 tool steel is similar to T1 Tool Steel materials, but with 4.25~5.75% cobalt added to increase heat resistance. The red hardness of T4 steel and the high temperature hardness is a little higher than T1 tool steel. AISI T4 tool steel is a deep hardening alloy capable of Rockwell C 64 hardness.

    2: T4 Steel equivalent
    Country USA German Japan
    Standard ASTM A600 DIN EN ISO 4957 JIS G4403
    Grade T4/T12004 1.3255/HS18-1-2-5 SKH3
    3: T4 steel chemical composition
    Grade C Si Mn P S Cr Mo V W Co
    T4 0.7-0.8 0.2-0.4 0.1-0.4 0.03 0.03 3.75-4.5 0.4-1.0 0.8-1.2 17.5-19 4.25-5.75
    1.3255 0.75-0.83 0.45 0.4 0.03 0.03 3.8-4.5 0.5-0.8 0.8-1.2 17.5-18.5 4.5-5.5
    SKH3 0.73-0.83 0.45 0.4 0.03 0.03 3.8-4.5 / 0.8-1.2 17-19 4.5-5.5
    4: T4 steel mechanical properties  

        The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

    5: T4 steel overviews
    Size Round Dia 2-300mm
    Plate/Flat/Block Thickness
    Heat treatment Normalized ; Annealed ; Quenched ; Tempered
    Surface condition Black; Peeled; Polished; Machined; Grinded; Turned; Milled
    Delivery condition Forged; Hot rolled; Cold drawn
    Test Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. 
    Payment terms T/T;L/C;/Money gram/ Paypal
    Trade terms FOB; CIF; C&F; etc..
    Delivery time 30-45 days
    Application T4 are used for Drills, Milling Cutters, Thread Cutting Tools, Knurling Tools, Cold extrusion punches, Broaches etc.

    6. AISI/ASTM T4 Tool Steel Heat Treatment and Properties


        Harden T4 high speed tool steel from a temperature of 1260-1290oC followed by oil, air quenching or warm bath at 550oC. Hardness after quenching is 63-66 HRC.


        T4 steel should be annealed after hot working. Increase the temperature of T4 high speed steel to 860°C(Max220°C per hour). Hold at the temperature and then cool slowly with the furnace. The annealed hardness achieved should be below HB255.


        Tempering temperature: 2x 560-580oC. Hardness after tempering is 64-65 HRC.

    7: Delivery condition

        For hot rolled bar, usually the delivery condition is hot rolled, annealed, Black surface.
        For cold drawn plate, usually the delivery condition is cold drawn, annealed, milled surface
        For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.