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DIN 1.2355 | ASTM S7 Hot Work Tool Steel

Port: Hu nan

Supply Ability: 10000 Metric Ton/Metric Tons per Year


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    1: AISI S7 steel introduction

        AISI S7 tool steel is a shock-resistant air hardening steel. AISI S7 steel has exceptional impact properties plus the highest hardenability of shock resisting grades of tool steel. Steel S7 also possesses good softening resistance at high temperatures which gives it hot work capabilities. Since S7 steel hardens in air, it is also safe and stable in heat treatment.

        AISI S7 tools steel has an unusual combination of properties, making it suitable for an extremely wide range of tool and die work - where shock-resistance, medium hot-work properties, or ease of machining and heat-treatment are most important.

    2: AISI S7 Steel equivalent
    Country China Japan Germany USA UK
    Standard GB/T 1299 JIS G4404 DIN EN ISO4957 ASTM A681 BS 4659

    1.2355/50CrMoV13-15 S7/T41907

    3: AISI S7 steel chemical composition
    Grade C Si Mn P S Cr V Mo
    S7/T41907 0.45 0.55 0.20 1.00 0.20 0.90 0.03 0.03 3.00 3.50 - 0.35 1.30 1.80
    0.45 0.55 0.20 0.80 0.50 0.90 0.03 0.02 3.00 3.50 0.15 0.35 1.30 1.70

    4: AISI S7 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: AISI S7 steel overviews

    Size Round Dia 6-1200mm
    Plate/Flat/Block Thickness
    Process EAF+LF+VD+Forged+Heat treatment(optional)
    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..
    Packing Standard Packages, or as Customers Request
    Delivery time 30-45 days
    Application  AISI S7 tool steel are suitable for  hot and cold shock applications, medium hot-work dies and medium-run cold work tools dies, Bull Riveters, Concrete Breakers (Moll Points), Riveting Dies, Powder Metal Dies, Notching Dies, Dowels, Drills, Drill Plates, Hubs, Plastic Mold Dies, Cold Forming Dies, Blanking Dies, Bending Dies, engraving dies, machined cavities for plastic molding dies, die-casting dies, shear blades and Master Hobs.

    6. AISI S7 Tool Steel Heat Treatment


        Anneal in a protective atmosphere. Heat rapidly to 1500 to 1550°F and hold at that temperature for one and one-half hours for each inch of greatest thickness. To obtain best machining properties, cool slowly to 1000°F, and then air-cool. This annealing procedure should produce a hardness of Brinell 197 max.
    Stress Relief S7 steel Material: When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, then cool in air.


        Preheat: Warm steel S7 slightly before charging into the preheat furnace 1200°-1300°F, prior to hardening.

    Harden: 1750°F. Quench S7 tool steel in air if cross section is 2-1/2″ or smaller; sections 2-1/2″ to 6″ should be oil quenched to black (1000°F) followed by air cooling to 150°F. Larger cross sections of S7 steel should be oil quenched to 150°F.

        Quench: Quench in still air or dry air blast.

        Temper: Tool steel S7 is normally tempered one hour per inch of section thickness to desired heating rate of 2 hours per inch. Cool in air to room temperature between the two tempers. The tempering temperature varies according to the intended use. Suggested: For cold-working and similar applications, the recommend400°-500°F. Hot working applications: apply a tempering temperature of 900°-1000°F. Never temper at less than 400°F.

    7: Delivery condition
        For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.
        For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.

        For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.