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DIMO 2738 Tool Steel – Superior Polishability & Dimensional Stability for High‑Quality Plastic Molds

DIMO 2738 is a prehardened CrMnNiMo-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 2738 shows a better through-hardening compared to DIMO 2311.

DIMO 2738 is a modified version of 1.2738 according to Stahl-Eisen-Liste and of 40CrMnNiMo8-6-4 according to EN ISO 4957. DIMO 2738 differs from 1.2311 according to Stahl-Eisen-Liste and from 40CMD8 according to NF A 35590 by a higher Ni-content of approximate 1 %.

Properties

Mechanical

PropertyValueComment

Hardness, Brinell

280 - 325 [-]

delivery condition

Tensile strength

890 - 1030 MPa

according to EN ISO 18265 table B2

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

1.19e-05 1/K

20-100 °C

1.25e-05 1/K

20-200 °C

1.31e-05 1/K

20-300 °C

1.36e-05 1/K

20-400 °C

1.41e-05 1/K

20-500 °C

1.41e-05 1/K

20-600 °C

Specific heat capacity

460 J/(kg·K)

Thermal conductivity

20 °C

34 W/(m·K)

100 °C

32 W/(m·K)

200 °C

33 W/(m·K)

300 °C

34 W/(m·K)

400 °C

34 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

0.9 - 1.1 %

limiting values

0.95 %

auxiliary data for 100 mm plate thickness

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

Vanadium alloyed depending on dimension.

Delivery condtion

DIMO 2738 is supplied in the prehardened (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 2738 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 2738 is available as plate with sheared or flame cut edges in the following dimensions:


Thickness≥ 12 ≤ 130 mm≥ 1/2 ≤ 5 in> 130 ≤ 165 mm> 5 ≤ 6.5 in
Width≥ 1000 ≤ 2500 mm≥ 40 ≤ 98.25 in≥ 1000 ≤ 2050 mm≥ 40 ≤ 80.5 in
Length≥ 4500 ≤ 6000 mm≥ 117.5 ≤ 236 in≥ 4000 ≤ 6000 mm≥ 157.5 ≤ 236 in

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


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


Unless otherwise agreed the marking is carried out via steel stamps with at least the following information:

  • steel grade (DIMO 2738)
  • heat number
  • number of mother plate and individual plate
  • the manufacturer’s symbol
  • inspector’s sign

    • Processing history

    The DIMO 2738 production route is designed to achieve the excellent properties of this mold steel type with superior surface requirements. DIMO 2738 is characterized by high dimensional stability. The DIMO 2738 production route provides excellent polishability, photoetchability and spark erosion properties. Therefore DIMO 2738 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. Thicknesses ≥ 100 mm show a better through-hardening compared to DIMO 2311.

    These properties can only be achieved by the combination of the following DIMO 2738-production steps:

  • desulphurization to S ≤ 0.002 % for high sulfidic cleanliness
  • chemical analysis in dependence of dimensions
  • 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 homogenity
  • 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 (HB) is tested on surface of each rolled mother plate.
  • Ultrasonic testing: Unless otherwise agreed, 100 % ultrasonic testing is performed on each plate in the delivery condition in accordance with EN 10160. As admissible limit applies quality class 4 in table 5 of EN 10228-3. Upon request, an ultrasonic testing in accordance with ASTM A 578, Level C, supplementary requirements S1 and S9 is possible. In this case the desired testing type has to be indicatd 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 / ASTM A 6 with the following restrictions:


    plate thicknessin accordance with EN 10029, class C / ASTM A 6
    plate thickness≥ 1000 mm ≤ 1500 mm± 25 mm≥ 40 ≤ 59 in± 1 in
    > 1500 mm ≤ 2050 mm± 40 mm> 59 ≤ 80.5 in± 1.5 in
    > 2050 mm± 50 mm> 80.5 in± 2 in
    plate length± 1000 mm± 40 in
    flatness≤ 3 mm/m (1/8 in/40 in)


    Unless otherwise agreed, short lengths ≥ 2 m (79 in) are part of the delivery.


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