P20 Steel | AISI P20 | 1.2311 | 3Cr2Mo

WALDUN is top P20 steel Manufacturer and Exporter in China, can supply with round,square,flat,block,and shaft etc.

AISI P20 Steel is a Cr-Mo alloyed steel as per ASTM A681.

It is generally supplied in the hardened and tempered condition with hardness 285-340 HBW.Compared with P20+S(1.2312),  it has good polishing and texturing properties,good machinability,and uniform hardness.

P20 Steel Supply Form & Size & Tolerance

Supply Form	Size(mm)	Process	Tolerance
Round	Φ6-Φ100	Cold Drawn	Bright/Black	Best H11
	Φ16-Φ350	Hot Rolled	Black	-0/+1mm
			Peeled/ground	Best H11
	Φ90-Φ1000	Hot Forged	Black	-0/+5mm
			Rough Turned	-0/+3mm
Flat/Square/Block	Thickness :120-800	Hot Forged	Black	-0/+8mm
	Width:120-1500		Rough Machined	-0/+3mm

Remark:Tolerance can be customized as per requests

P20 Steel Chemical Composition

Standard	Grade	C	Si	Mn	P	S	Cr	Mo
ASTM A681	P20	0.28-0.4	0.2-0.8	0.6-1.0	0.03	0.03	1.4-2.0	0.3-0.55
DIN ISO 4957	1.2311	0.35-0.45	0.2-0.4	1.3-1.6	0.03	0.03	1.8-2.1	0.15-0.25
GB/T 1299	3Cr2Mo	0.28-0.4	0.2-0.8	0.6-1.0	0.03	0.03	1.4-2.0	0.3-0.55

P20 Steel Physical Property

Temperature	20°C	200°C
Density,kg/m3	7800	7750
Modulus of elasticity,N/mm2	250000	200000
Coefficient of thermal expansion,per °C from 20°C	—	12.7 x 10 ^–6
Thermal conductivity,W/mk	29	29.5
Specific heat,J/kg °C	460	—

P20 Steel Mechanical Property

Testing temperature	20°C	200°C
Tensile strength Rm,N/mm2	1020	930
Yield strength Rp 0.2,N/mm2	900	800
Compressive yield strength Rc 0.2,N/mm2	850-1000
Elongation ,%	20	—
Charpy-v impact,J	27	—

P20 Steel Forging

Heat AISI P20 to the temperature  700 ^oC ,hold for suitable time,then heat the temperature uniformly to 900 ^oC – 1100 ^oC.Forging below 870°C is not recommended for P20. Cooling in sand after forged.

P20 Steel Stress Relieving

After rough machining ,P20 should be heated through to500- 550°C, holding time 2 hours. Cool slowly in the furnace  to room temperature.

P20 Steel Annealing

Heat P20 in a protective atmosphere (preferably a controlled atmosphere furnace) to 720-750°C,and hold for one hour per inch of thickness. Cool in the furnace at 10°Ccper hour to 600°C,Then air-cool to room temperature.The resulting hardness Is Brinell 235 max.

P20 Steel Hardening

Preheating temperature: 500–600°C
Austenitizing temperature: 880°C.

The steel should be heated through to the austenitizing temperature and hold at temperature for 30 minutes. Protect the tool against decarburization and oxidation during the hardening process.

Quenching Media
• High speed gas/circulating atmosphere. (Only suitable for small dimensions)
• Oil (Warm oil (65-80°C))
• Martempering bath 300°C, max. 4 minutes,then air cool
Note: Temper immediately when tool reaches 50–70°C.

P20 Steel Tempering

Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper twice with intermediate cooling to room temperature. Lowest tempering temperature 180°Cfor small inserts, but preferred minimum is 250°C, unless material is to be nitride or nitrocarburized later. Holding time at temperature minimum 2 hours.

Tempering,°C	100	200	300	400	450	500	550	600
HRC	56	54	51	47	44	42	39	36
Rm,N/mm2	2050	1910	1730	1530	1400	1330	1230	1140

P20 Steel Application

AISI P20 tool steels are used for low temperature applications that include injection molds and die casting dies. Typical application are:

• For large injection and compression molds
• Extrusion dies for thermoplastics
• Blow molds
• High strength holders, plates and bolsters
• Forming tools, press-brake dies (possibly flame hardened or nitrided)
• Aluminum die casting prototype dies
• Zinc die casting dies
• Long run die shoes
• Structural components, shafts