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P20 is an alloy tool steel which offers good machine ability even in the hardened and tempered (Brinell 300) condition. This steel gives an excellent polished finish and is one of the most widely accepted specifications for machine cut plastic molds and casting dies. P20 is often supplied in the hardened and tempered condition ready for machining. In this condition it gives excellent wear resistance but if maximum surface hardness is required for compression molding plastic dies or similar tools, the steel can be case hardened or nitride. For better machinability a higher Sulphur version P20S is available. For improved through hardenability in larger sections we also offer 1.2738 P20N
P20 tool steel is ideally suited for the production of plastic molds. Typical applications include die holders, zinc die casting dies, backers, bolsters and injection molds. The versatility of P20 tool steel with its high tensile characteristics enables uses for a variety of other applications such as shafts, rails and wear strips.
|Standard||ASTM A681||DIN EN ISO 4957||GB/T 1299|
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of P-20 steel:
The mechanical properties of P20 tool steels are displayed in the following table.
|Hardness, Brinell (typical)||300||33|
|Hardness, Rockwell C (typical)||30||30|
|Tensile strength, ultimate||965-1030 MPa||140000-150000 psi|
|Tensile strength, yield||827-862 MPa||120000-125000 psi|
|Elongation at break (in 50 mm (2″))||20.0%||20.0%|
|Compressive strength||862 MPa||125000 psi|
|Charpy impact (V-Notch)||27.1-33.9 J||20.0-25.0 ft-lb|
|Elastic modulus||190-210 GPa||27557-30457 ksi|
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.
Heat the steel uniformly to 820-840°C until heated through. Quench in oil.
Heat uniformly and soak at the tempering temperature for at least one hour per 25mm of section. Allow to cool in still air.
The following table shows the physical properties of P20 tool steels.
|Density||7.85 g/cc||0.284 lb/in3|
The thermal properties of P20 tool steels are given in the following table.
|Thermal expansion||12.8 x 10-6/ºC||20-425||–|
Heat slowly, allowing sufficient time for the steel to become heated through. Begin forging at 1050°C. Do not forge below 930°C reheating if necessary. After forging, cool very slowly.
When dies are heavily machined, we recommend stabilizing just before finish machining in order to relieve machining strains. Heat to 460-500°C. Soak well and allow to cool in the air.
Heat uniformly to 770-790°C. Soak well, cool slowly in the furnace.
|Density||7.85 g/cc||0.284 lb/in3|