Baosteel P20 / 1.2311 Plastic Mold Steel Hot Rolled Steel Plate And Flat Bar

 

Baosteel P20/ 1.2311/ 3Cr2Mo Plasitic Mold Steel, Hot Rolled Steel Plate and Flat Bar​

 

Prehardening 1.2311 P20 3Cr2Mo tooling steel is a common alloy tool steel which usually supplied in QT condition. The 1.2311 P20 P20 3Cr2Mo can give an excellent polished finish.Forging prehardening tempering 1.2311 P20 P20 3Cr2Mo tool steel is one of the most widely used material for machine cut plastic moulds. This grade also provides excellent wear resistance.

 

Mechanical Properties

 

Properties	Metric
Hardness, Brinell (typical)	300
Hardness, Rockwell C (typical)	30
Tensile strength, ultimate	965-1030 MPa
Tensile strength, yield	827-862 MPa
Elongation at break (in 50 mm (2″))	20.00%
Compressive strength	862 MPa
Charpy impact (V-Notch)	27.1-33.9 J
Poisson’s ratio	0.27-0.30
Elastic modulus	190-210 GPa

 

 

1, Features

 

a, Good integral machanical performance when under high temperature, high Corrosion resistance
 

b, Good hardness uniformity and polishing property,good machining properties.

c, Good heat-resistance and fatigue-resistance,very high mechanical behavior,cutting mechanical property.

d, 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, inspection.

 

e, Pre-hardened to HRC28-32, can be directly used on mould processing, shorten the construction period.

 

 

2, Equivalent Grades

 

GB	DIN	AISI	JIS
3Cr2Mo	1.2311	P20	PDS-3

 

 

3, Chemical Composition (Wt%)

 

Steel Grade	C	Si	Mn	Cr	Mo	S	P
1.2311	0.35-0.45	0.20-0.40	0.60-1.00	1.80-2.10	0.30-0.55	≤0.003	≤0.030
P20	0.35-0.45	0.20-0.40	0.60-1.00	1.80-2.10	0.30-0.55	≤0.003	≤0.030
PDS-3	0.35-0.45	0.20-0.40	0.60-1.00	1.80-2.10	0.30-0.55	≤0.003	≤0.030

 

 

4, Available Size(mm)

 

Plate Size(mm)			Flat Bar Size(mm)			Round Bar Size(mm)
Thickness	Width	Length	Thickness	Width	Length	Diameter	Length
10-700	1600-2200	4000-10000	10-700	155-2200	2000-6000	20-200	2000-6000

 

 

5, Recommend Hear Treatment 

 

Quenching				Tempering
Heating temperature/℃		Cooling way	Hardness (HRC)	Heating temperature/℃		Cooling way	Hardness (HRC)
850-880		Oil Cooling	50-52	580-640		Air Cooling	28-32

 

 

6, Applications

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 injection moulds;

c, Shafts, rails and wear strips;

 

 

 

 

 

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)

 

Thermal Conductivity:

 

24 Btu/ft/hr/°F

 

41.5 W/m/°K

 

Machinability: 60-65% of a 1% carbon steel

 

 

HEAT TREATMENT of Forging 1.2311 P20 P20 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 these steels.

 

 

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 in oil.

 

 

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 approximately 0.1mm.

 

 

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:Forging 1.2311 P20 P20 3Cr2Mo plastic mould steel 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 plastic mould steel.

 

 

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.