Cold Work Alloy Tool Steel Cr5mo1V/1.2363/A2/X100crmov5-1/SKD12 Steel Plate

GB Cr5Mo1V | JIS SKD12 | DIN 1.2363 | BS BA2 | ASTM A2/T30102 Cold Work Tool Steel

Quick Details

1: AISI A2 steel introduction
    AISI A2 tool steel is one of 'A' group cold works steel in ASTM A681 standard. A2 Tool Steel is a versatile, air hardening chromium alloy tool steel that replaces O1 tool steel when safer hardening, less distortion and increased wear resistance are required. AISI type A2 steel is intermediate in wear resistance between O1 oil-hardening tool steel and D2 high-carbon, high-chromium tool steel.
 
2: AISI A2 Steel equivalent

    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.

6: Heat Treatment

Stress relieving

    After heavy grinding or machine it is advisable to stress relieve tool steel A2 to reduce the danger of cracking or distortion during subsequent heat treatments. Heat slowly to 670-700°C, soak for a minimum of two hours per 25mm of section then cool down in the furnace.

Annealing

    To prevent decarburization use a controlled atmosphere furnace or pack in a sealed container using some inert material. To anneal A2 tool steel for lowest hardness, heat slowly to 899°C(1650°F) and hold at this temperature for about two hours per inch of greatest cross-section. Cool steel A2 at a rate of 20°F (10°C) per hour to 650°C (1200°F) and reheat to 732°C (1350°F); hold 3 hours per inch of greatest cross-section; furnace cool at 20 degrees per hour to 593°C (1100°F); then furnace-cool to 482°C (900°F) and air-cool.

Hardening

    Preheating temperature: 1200-1380°F (650-750°C). Austenitizing temperature: 1700 -1780°F (925-970°C) but usually 1720-1760°F (940-960°C).

Tempering

    Choose the tempering temperature according to the hardness required by reference to the tempering graph.

Heat uniformly and thoroughly to the desired temperature and hold for 25 minutes per cm of thickness. Tool steel A2 can be double tempering, after intermediate cooling to room temperature. Temper at 200°C for a balance of hardness and strength or 350°C where strength is more important than hardness. A minimum holding time of 2 hours per inch of greatest cross-section should be used.

Quenching

    Martempering bath or fluidized bed at 360-430°F (180-220°C) or 840-1020°F (450-550°C) then cool in air

    Circulating air or atmosphere

    Vacuum furnace with overpressure of gas at cooling

    Oil (only for small and uncomplicated tools)

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