DIMO 2312: Premium Hardened CrMnMoS Tool Steel for High-Performance Plastic Molds

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.

Properties

Mechanical

Property	Value	Comment
Hardness, Brinell	280 - 325 [-]	HBW \| delivery condition (air hardened + tempered)
Tensile strength	890 - 1030 MPa	according to EN ISO 18265 table B2

Thermal

Property	Temperature	Value	Comment
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

Property	Value	Comment
Carbon	0.35 - 0.45 %	limiting values
	0.4 %	auxiliary data for 100 mm plate thickness
Chromium	1.8 - 2 %	limiting values
	1.9 %	auxiliary data for 100 mm plate thickness
Iron	Balance
Manganese	1.4 - 1.6 %	limiting values
	1.5 %	auxiliary data for 100 mm plate thickness
Molybdenum	0.15 - 0.25 %	limiting values
	0.2 %	auxiliary data for 100 mm plate thickness
Nickel	0.15 %	auxiliary data for 100 mm plate thickness (alloyed depending on dimensions)
Phosphorus	0.022 %	auxiliary data for 100 mm plate thickness
	0.03 %	max. limiting values
Silicon	0.3 - 0.5 %	limiting values
	0.35 %	auxiliary data for 100 mm plate thickness
Sulfur	0.05 - 0.1 %	limiting values
	0.06 %	auxiliary data for 100 mm plate thickness
Vanadium	0.05 %	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 thickness	in 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)

UGI® 4542 H1150D: High‑Strength Martensitic Stainless Steel with Superior Corrosion Resistance EN 573-3 Grade AW-2117 O – Standard Aluminium Wire Properties

Metal