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DIMO 2311: Premium Hardened CrMnMo Tool Steel for Precision Plastic Molds

DIMO 2311 is a hardened CrMnMo-alloyed tool steel for the construction of plastic molds with superior surface requirements on molds. It is characterized by excellent polishability, photoetchability, spark erosion behaviour and dimensional stability as well as good machinability.

DIMO 2311 is a modified version of 1.2311 according to Stahl-Eisen-Liste, respectively 40CMD8 according to NF A 35590, 40CrMnNiMo8-6-4 according to DIN EN ISO 4957 and a modified version of P20 according to ASTM A681.

Properties

Mechanical

PropertyValueComment

Hardness, Brinell

280 - 325 [-]

HBW | delivery condition (air hardened + tempered)

Tensile strength

890 - 1030 MPa

according to EN ISO 18265 table B2

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

1.21e-05 1/K

20-100 °C

1.27e-05 1/K

20-200 °C

1.32e-05 1/K

20-300 °C

1.38e-05 1/K

20-400 °C

1.42e-05 1/K

20-500 °C

1.43e-05 1/K

20-600 °C

Specific heat capacity

460 J/(kg·K)

Thermal conductivity

20 °C

34 W/(m·K)

100 °C

35 W/(m·K)

200 °C

36 W/(m·K)

300 °C

36 W/(m·K)

400 °C

36 W/(m·K)

Chemical properties

PropertyValueComment

Carbon

0.35 - 0.45 %

limiting values

0.4 %

auxiliary data for 100 mm plate thickness

Chromium

1.8 - 2.1 %

limiting values

1.9 %

auxiliary data for 100 mm plate thickness

Iron

Balance

Manganese

1.3 - 1.6 %

limiting values

1.55 %

auxiliary data for 100 mm plate thickness

Molybdenum

0.15 - 0.25 %

limiting values

0.2 %

auxiliary data for 100 mm plate thickness

Nickel

0.12 %

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

Phosphorus

0.015 %

auxiliary data for 100 mm plate thickness

0.025 %

max. limiting values

Silicon

0.2 - 0.4 %

limiting values

0.3 %

auxiliary data for 100 mm plate thickness

Sulfur

0.001 %

auxiliary data for 100 mm plate thickness

0.002 %

max. limiting values

Vanadium

0.05 %

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

Technological properties

Property
Application areas

For the construction of plastic molds with superior surface requirements on molds.

Chemical composition

Nickel, Vanadium alloyed depending on dimension.

Delivery condtion

DIMO 2311 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 2311 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 2311 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 ≤ 170 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 2311)
  • heat number
  • number of mother plate and individual plate
  • the manufacturer’s symbol
  • inspector’s sign

    • Processing history

    The DIMO 2311 production route is designed to achieve the excellent properties of this mold steel type with superior surface requirements. DIMO 2311 is characterized by high dimensional stability. The DIMO 2311 production route provides excellent polishability, photoetchability and spark erosion properties. Therefore DIMO 2311 is particularly suitable for molds with superior surface requirements if suitable manufacturing processes are employed.

    The good sulfidic and oxidic cleanliness and the modification of the few remaining inclusions by the calcium treatment lead to good machinability and minimize the tool wear. These properties can only be achieved by the combination of the following DIMO 2311-production steps:

  • desulphurization to S =< 0.002 % for high sulfidic cleanliness
  • chemical composition analysis in dependence of plate thickness
  • vacuum degassing
  • argon stirring for high sulfidic and oxidic cleanliness
  • calcium treatment for inclusion shape control
  • special casting conditions to assure the high cleanliness and homogeneity
  • 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 thickness≥ 1000 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)


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