Flat Bar (P20/ 1.2311/ 3Cr2Mo) of Plastic Mold Steel with Q+T
widely using range steel P20 special mould steel Prehardening Wear
Resistance Corrosion resistance mechanical behavior 1.2311 P20
Prehardening Corrosion resistance special Plastic Mold Steel plate
Material is a versatile, low-alloy tool steel that is characterized
by good toughness at moderate strength levels. The special purpose
Prehardening mold steel P20 steel plate is commonly used for
plastic injection mold cavities and tooling and for die casting
dies for zinc. widly using range steel 1.2311 P20 special mold
steel plate material is typically sold in the pre-hardened
condition at a hardness of approximately 300 HBW. And wth good
cutting mechanical property and Corrosion resistance
Physical Properties of 1.2311, P20, 3Cr2Mo
Density: 0.284 lb/in3 (7861 kg/m3)
Specific Gravity: 7.86
Modulus of Elasticity: 30 x 106 psi (207 GPa)
Machinability: 60-65% of a 1% carbon steel
a, Good hardness uniformity and polishing property,good machining
b, Good integral machanical performance when under high
temperature, high Corrosion resistance
c, Good heat-resistance and fatigue-resistance,very high mechanical
behavior,cutting mechanical property.
d, Pre-hardened to HRC28-32, can be directly used on mould
processing, shorten the construction period.
e, High putity and homogeneous structure of China's biggest ESR
production base for its strict requirement in the whole process of
exploitation, smelting, vacuum degassing, ESR, forging, annealing,
2, Equivalent Grades
3, 3Cr2Mo 1.2311 P20 Chemical Composition (Wt%)
4, Available Size (mm)
|Plate Size(mm)||Flat Bar Size(mm)||Round Bar Size(mm)|
5, Recommend Heart Treatment
|Heating temperature ºC||Tempering|
|First preheating||Second preheating||Last heating||Cooling way||Hardness (HRC)|
Used for various lager-sized or medium-size precision plastic mould
and alloy parts.
a, Ideally suited for the production of plastic moulds;
b, Die holders, zinc die casting dies, backers, bolsters and
c, Shafts, rails and wear strips;
7, Packing: Standard Export Packing or As per request
HEAT TREATMENT of 1.2311 P20 PDS-3 3CR2Mo
Forging: P20 plastic mould steel are forged at 1093°C (2000°F) down to
899°C (1650°F). Forging below 871°C (1600°F) is not recommended for
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.
Stress Relieving: When dies are heavily machined, we recommend stabilising just
before finish machining in order to relieve machining strains. Heat
to 460-500°C. Soak well and allow to cool in the air.
Hardening: Heat the steel uniformly to 820-840°C until heated through. Quench
Tempering: Heat uniformly and soak at the tempering temperature for at least
one hour per 25mm of section. Allow to cool in still air.
Carburising / Case Hardening: Tools produced from may be case hardened, which can achieve a
surface hardness of 55 to 59 HRc.
Tufftriding: At 570ºC tufftriding of 1.2311 P20 PDS-3 3CR2Mo tool steel will give a surface hardness of approximately 700HV.
Allowing two hours treatment the surface hard layer will be
Hard Chromium Plating: To avoid hydrogen embrittlement P20 should be tempered for 4 hours
at 180°C for 4 hours after hard chromium plating
Flame / Induction Hardening: Flame or induction hardening of P20 will achieve a hardness of 50
to 55HRc. Air cooling is preferable, though smaller components may
require forced cooling. Temper immediately after hardening.
Cold Working:P20 plastic mould steel are capable of being readily cold worked by
using conventional tooling methods with the alloy in the annealed
Welding: Conventional methods are used for welding of P20 plastic mould
Forming: P20 plastic mould steel can be readily formed by conventional
methods in the annealed condition.
Machinability: P20 plastic mould steel have excellent machinability at about 80%
that of water hardening steels.