DIMO 2312 (EN 1.2312)

Alternative and trade names
ASTM A681 Grade P20, DIN EN ISO 4957 Grade 40CrMnNiMo8-6-4, NF A 35590 Grade 40CMD8+S
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Description

DIMO 2312 is a hardened CrMnMoS-alloyed tool steel for the construction of plastic molds with lower surface requirements referring to e.g. polishability and photoetchability. DIMO 2312 is characterized by excellent machinability and high dimensional stability.

DIMO 2312 is a modified version of 1.2312 according to Stahl-Eisen-Liste, respectively 40CMD8+S according to NF A 35590, 40CrMnNiMo8-6-4 according to DIN EN ISO 4957 and a modified version of P20 according to ASTM A681.

Related Standards

This material data has been provided by Dillinger.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

Mechanical

PropertyValueComment

Hardness, Brinell

280 - 325 [-]

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HBW | delivery condition (air hardened + tempered)

Tensile strength

890 - 1030 MPa

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according to EN ISO 18265 table B2

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

1.21e-05 1/K

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20-100 °C

1.27e-05 1/K

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20-200 °C

1.32e-05 1/K

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20-300 °C

1.38e-05 1/K

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20-400 °C

1.42e-05 1/K

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20-500 °C

1.43e-05 1/K

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20-600 °C

Specific heat capacity

460 J/(kg·K)

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Thermal conductivity

20 °C

34 W/(m·K)

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100 °C

35 W/(m·K)

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200 °C

36 W/(m·K)

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300 °C

36 W/(m·K)

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400 °C

36 W/(m·K)

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Chemical properties

PropertyValueComment

Carbon

0.35 - 0.45 %

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limiting values

0.4 %

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auxiliary data for 100 mm plate thickness

Chromium

1.8 - 2 %

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limiting values

1.9 %

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auxiliary data for 100 mm plate thickness

Iron

Balance

Manganese

1.4 - 1.6 %

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limiting values

1.5 %

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auxiliary data for 100 mm plate thickness

Molybdenum

0.15 - 0.25 %

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limiting values

0.2 %

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auxiliary data for 100 mm plate thickness

Nickel

0.15 %

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auxiliary data for 100 mm plate thickness (alloyed depending on dimensions)

Phosphorus

0.022 %

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auxiliary data for 100 mm plate thickness

0.03 %

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max. limiting values

Silicon

0.3 - 0.5 %

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limiting values

0.35 %

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auxiliary data for 100 mm plate thickness

Sulfur

0.05 - 0.1 %

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limiting values

0.06 %

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auxiliary data for 100 mm plate thickness

Vanadium

0.05 %

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auxiliary data for 100 mm plate thickness (alloyed depending on dimensions)

Technological properties

Property
Application areas

It is used by the customers for accessories with holder block requirements as e.g. ejector plates, supports, clamping plates and housings for diecasting dies.

Chemical composition

Nickel, Vanadium alloyed depending on dimension.

Delivery condtion

DIMO 2312 is supplied in the hardened (air hardened + tempered) condition.

General note

If special requirements, which are not listed in this specification, are to be met by the steel due to its intended use or processing, these requirements are to be agreed before placing the order.

The information in this specification is a product description. This specification is updated if necessary. The latest version is available from the mill or as download at www.dillinger.de.

Heat Treatment

DIMO 2312 is delivered in the hardened condition; therefore further heat treatment is generally not necessary. This avoids the risks and costs involved by the hardening and tempering of a mold after processing. Should a heat treatment become necessary, recommended data can be found in material data sheet at www.dillinger.de.

Other

DIMO 2312 is available as plate with cut edges (sheared, flame cut or water jet cut) in the following dimensions:


Thickness≥ 12 ≤ 130 mm 1⁄2 5 in> 130 215 mm> 5 8.5 in
Width 1000 2500 mm 40 98.25 in 1000 2050 mm 40 80.5 in
Length 3000 6000 mm 119 236 in 3000 6000 mm 119 236 in

Widths < 1250 mm (49 in) have to be ordered with an even number of plates, Other dimensions available upon request.


Identification of plates: Unless otherwise agreed the marking is carried out via steel stamps with at least the following information:
  • steel grade (DIMO 2312)
  • heat number
  • number of mother plate and individual plate
  • the manufacturer’s symbol
  • inspector’s sign

  • Processing history

    The DIMO 2312 production route is designed to achieve the excellent machinability and dimensional stability of this holderblock steel type. The high oxidic cleanliness and the large number of sulfides provide excellent machinability and low tool wear. On flame cut edges, a surplus of 10 mm for the machining has to be scheduled. DIMO 2312 should only be applied for molds if the surface requirements referring to e.g. polishability and photoetchability are less ambitious. DIMO 2312 should not be applied for spark erosion.

    The above mentionned properties can only be achieved by the combination of the following DIMO 2312-production steps:

  • chemical composition in dependence of thickness
  • vacuum degassing
  • argon stirring for high oxidic cleanliness
  • sulphur alloying
  • special casting conditions to assure the high oxidic cleanliness
  • High Shape Factor Rolling (high thickness reduction) to realize a closely packed structure
  • appropriate heat treatment parameters according to analysis and dimensions to assure homogeneous hardness distribution over the plate and to minimize residual stresses

  • Surface condition

    Surface quality: Unless otherwise agreed, the specifications will be in accordance with EN 10163-2 class A, subclass 3. Shot blasting of upper and lower surface of the plate and shop priming are possible on request.

    Testings

  • Heat analysis
  • Dimension control
  • Surface inspection
  • Hardness: The hardness (HBW) is tested on surface of each rolled mother plate.
  • Ultrasonictesting: Unless otherwise agreed, 100 % ultrasonic testing is performed on each plate in accordance with EN 10160. As admissible limit applies for thickness =< 150 mm quality class 3 and for thickness > 150 mm quality class 2 in table 5 of EN 10228-3. Upon request, an ultrasonic testing in accordance with ASTM A 578, Level C supplementary requirements S1 is possible. In this case the desired testing standard has to be indicated on the order.

    Unless otherwise agreed, the results are documented in an inspection certificate 3.1 in accordance with EN 10204.

  • Tolerances

    Unless otherwise agreed, tolerances are in accordance with EN 10029, with the following restrictions:


    plate thicknessin accordance with EN 10029, class C
    plate thickness1000 mm ≤ 1500 mm-0/+40 mm 40 ≤ 59 in-0/+1.6 in
    > 1500 mm ≤ 2050 mm-0/+50 mm> 59 ≤ 80.5 in-0/+2 in
    > 2050 mm-0/+100 mm> 80.5 in-0/+4 in
    plate length± 500 mm± 20 in
    flatness 3 mm/m, ≤ 6 mm/2 m (1/8 in/40 in, 2/8 in/80 in)