Tempering:	P20 tool steels are tempered at 482-593°C (900 to 1100°F) for a Rockwell C hardness of 28 to 34.
Annealing:	Annealing 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.
Cold Working:	P20 tool steels are capable of being readily cold worked by using conventional tooling methods with the alloy in the annealed condition.
Welding:	Conventional methods are used for welding of P20 tool steels.
Forging:	P20 tool steels are forged at 1093°C (2000°F) down to 899°C (1650°F). Forging below 871°C (1600°F) is not recommended for these steels.
Forming:	P20 tool steels can be readily formed by conventional methods in the annealed condition.
Machinability:	P20 tool steels have excellent machinability at about 80% that of water hardening steels.
Heat Treatment:	P20 tool steels are heated to 871-899°C (1600-1650°F) in the carburizing medium during the carburizing process. After being carburized, these steels are heated to 816-871°C (1500-1600°F) in order to be hardened and then held for 15 minutes and finally oil quenched.
Applications:	P20 tool steels are used for low-temperature applications that include injection molds and die casting dies.

Different type for Square bar

Low Carbon Square bar: Contain up to 0.3% carbon. They are highly ductile, making them ideal for applications requiring extensive forming and welding.
Medium Carbon Square bar: Contain between 0.3% and 0.6% carbon. These plates offer a good balance of strength and ductility, suitable for machinery parts and automotive components.
High Carbon Square bar: Contain between 0.6% and 1.0% carbon. They are known for their high strength and hardness, often used in cutting tools and high-strength wires.
Ultra-High Carbon Square bar: Contain between 1.0% and 2.1% carbon. These plates are extremely hard and are used in specialized applications like knives and springs.

Advantage of Square bar

Corrosion Resistance Treated for excellent corrosion resistance, extending service life and reliability.
High Strength and Durability High tensile strength and durability, suitable for heavy-duty applications.
Good Workability Smooth surface and uniform thickness, easy to cut, weld, and form.
Variety of Specifications Available in various sizes and thicknesses, adaptable to different applications.
Cost-Effective More affordable than other steel types, economical for large projects.
Wide Range of Applications Versatile, used in construction, manufacturing, machinery, shipbuilding, and oil and gas industries.