P20/40CRMNNIMO8-6-4/DIN 2311/AISI P20/AFNOR Z210CW12-01

P20 is an alloy tool steel with good machining ability even when hardened and tempered (Brinell 300). This steel has a polished surface and is one of the most regularly used requirements for machine cut plastic molds and casting dies. P20 is frequently hardened and tempered, ready for machining. It provides great wear resistance in this form, however if maximal surface hardness is required for compression molding plastic dies or similar equipment, the steel can be case hardened. A higher Sulfur variant, P20S, is offered for improved machinability.

Available Types & Range

Form of Supply Size(mm) Length(mm)
Rolled Rounds Φ 16  -Φ 450 Standard or As your request
Rolled Flats Thickness : 10 – 200
Width: 25 – 650		 Standard or As your request

Chemical Composition & Technical Specification P20

C 0.38 Mn 1.40 Cr 1.85 Mn 0.20
Mechanical Properties:
Tensile Strength 965-1030 MPa
Yield Strength 827-862 MPa
Hardness 30 HRC
Elongation 20%
Compressive Strength 862 MPa
Elastic Modulus 190-210 GPa

Heat Treatment & Processes:

Heat Treatment

During the carburizing process, P20 / DIN 2311 / AISI P20 tool steels are heated to 871-899°C (1600-1650°F) in the carburizing medium. After carburizing, these steels are heated to 816-871°C (1500-1600°F) to harden, then held for 15 minutes before being oil quenched.

Hardening:

Heat the steel consistently to 820-840°C until completely heated. Soak in oil to cool.

Forging:

Heat gently, giving the steel enough time to heat all the way through. start forging at 1050 degrees. Never forge below 930°C, reheating as needed. After forging, allow it to progressively cool.

Stress Relieving:

To reduce machining stresses when dies are substantially machined, stabilizing is advised right before finishing machining. 460° to 500° Celsius. Good soaking followed by air cooling is advised.

Normalizing:

Heating uniformly to 900°C for P20 / DIN 2311 / AISI P20 steel.

Annealing:

Heating consistently to 770–790°C for P20 / DIN 2311 / AISI P20 annealing. Good soaking, gentle cooling in the boiler.

Tempering:

Heat evenly and soak for at least one hour for every 25mm of section at the tempering temperature. Allow it to cool in a cool air.

Welding:

P20 / DIN 2311 / AISI P20 tool steels are welded using traditional techniques.