Astm Aisi P20 Steel Round Bar Ultrasonic Testing - China

P20 Steel Application

P20 steel is used to make thermoplastic molds, extrusion dies, injection molds and die casting dies.

And can also be used to make main components of heavy-duty mold.

In addition, it also be used to produce cold structural parts, TV cases, washing machines, inner casings of refrigerator and buckets.

Of course, 1.2311 steel can also be used to make bumper dies for automobiles or structural components of cars.

1.2311 steel has very good hardness and plasticity.

So it can be used to make a variety of molds.

P20 Steel Round Bar Sheet Plate Heat Treatment

Stress Relieving Preheating: Because mold steel 1.2311 steel plate is sold in a pre-hardened condition, hardening heat treatment is not necessary.

After machining and intermittently during service, the steel must be thermally stress relieved by heating to 900ºF (482ºC), equalizing and holding for one hour per inch (25.4mm) of thickness, and cooling in air to ambient temperature.

In those rare circumstances where the AISI steel P20 must be re-hardened, the steel must first be annealed prior to hardening.

Hardening Critical Temperature: Ac1: 1405ºF (763ºC) Preheating of P20 metal: Heat at a rate not exceeding 400ºF per hour (222ºC per hour) to 1150-1250ºF (621-677ºC) and equalize.

Austenitizing (High Heat) Heat rapidly from the preheat to 1550ºF (843°C).

Soak for 30 minutes for first inch (25.4mm) of thickness, plus 15 minutes for each additional inch (25.4mm).

Quenching Pressurized gas, or interrupted oil to 150-125ºF (66-51ºC).

For oil, quench until black, at about 900°F (482°C), then cool in still air to 150-125°F (66-51°C).

Tempering 1.2311 tool steels are tempered at 482-593°C (900 to 1100°F) for a Rockwell C hardness of 37 to 28 - Annealing Annealing for AISI P20 tool steels takes place at 760-788°C (1400 to 1450°F) and then the steels are cooled slowly in the furnace at a temperature less than 4°C (40°F) per hour.

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