1.2311, P20 Plastic mould steel
In the DIN EN ISO 4957 the grades 1.2311 (AISI P20), 1.2312(AISI P20+S) and 1.2738 (AISI P20+Ni) covered by the above mentioned code were amalgamated. The grade 1.2311 does not contain additional quantities of Sulphur or Nickel.
1. Applications:
Plastic moulds, frames for plastic pressure dies, hydroforming tools.
2. Chemical analysis:
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C%
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Mn%
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Si%
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Cr%
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Mo%
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P%
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S%
|
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0.28~0.4
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0.60~1.00
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0.20~0.80
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1.40~2.00
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0.30~0.55
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=<0.03
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=<0.03
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3. Mechanical properties:
Plastic mould steel that is usually supplied in a quenched and tempered condition. Good machinability, better polish ability, compared to 1.2312 (AISI P20+S). Similar to AISI P20.
4. Condition of delivery:
Quenched and tempered, 950 - 1100 N/mm²
5. Available sizes:
Round Bar: Φ 3.2-300mm
Flat: 10-120*205-610mm
Plate: 8-300mm*1800-3600*6000-12000mm
Mould: 100*200-900*1000mm
Length:3000-6000mm
6. Physical properties:
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Thermal expansion coefficient
|
10-6 m
|
20-100°C
|
20-200°C
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20-300°C
|
20-400°C
|
|
m K
|
12.1
|
12.7
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13.2
|
13.6
|
|
|
Thermal conductivity
|
W
|
20°C
|
350°C
|
|
|
|
m K
|
39.6
|
39.2
|
|
|
7. Heat treatment:
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Soft annealing
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Temperature
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Cooling
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Hardness
|
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710 - 740°C
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furnace
|
max. 235 HB
|
|
|
|
|||
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Stress relief annealing
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Temperature
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Cooling
|
|
|
500 - 550°C
|
furnace
|
|
|
|
|
|||
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Hardening
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Temperature
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Cooling
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Tempering
|
|
830 - 870°C
|
oil or hot bath
180 - 220°C
|
see tempering
diagram
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|
