Application:

Suitable for high quality aluminum, magnesium and zinc alloy casting mould, polished plastic hard mould, as well as fiberglass type home electronics mould.

Forged, Black surface/Milled, annealed ≤ 229HB, Electro Slag Remelting, 100% Ultrasonic test on steel.

Comparable Standards:

Chemical Analysis (%):

Heat treatment

Isothermal annealing:

- Heat to 880°C, hold at temperature for 1/2 h to 1 h;

- Furnace cooling to 780°Cand hold at temperature for at least 5 hours;

- Cool by 10°C/h to 750°C;

- Cooling in air.

Maximum hardness: 230 HB

Stress relieving:

To be carried out after maching and before the final heat treatment.

- Heat to 650÷700°C, hold for 4÷6 hours;

- Furnace cooling to 300÷350°C;

- Cooling in air.

Hardening:

- Initial preheating to 350÷450°C;

- Second preheating to 750÷850°C;

- Heat to hardening temperature in the range 1000÷1050°Cand hold at temperature;

- Cooling in air.

Quenched hardness: 52÷56 HRC

Tempering:

In the range 550÷630°Cfor at least 3 hours according to hardness requirements and conditions of use.

Tempering must be repeated a second time at a temperature to or 20°Clower than the previous.

Before tempering, preheat the parts to 200÷300°C.