A prehardened mold steel (300 HB/32 HRC) with improved machinability

W1.2312 is a chromium – manganese – molybdenum grade designed for plastic mold industry. This grade is normaly delivered in a prehardened condition at a hardness level of 300HB/32HRC. The grade has a fully homogeneous martensite – bainite microstructure.W1.2312 grade has specific sulfur addition (0.060% typical) in order to increase strongly its machinability. Compared to W1.2311 grade, 30% increase in milling speed and 300% increase in drilling speed can be expected. At constant cutting speed, tool life is multiplied a least by 5 when replacing W1.2311 by W1.2312 grade. W1.2312 is not suitable for polishing requirements.

Standard
AFNOR: 40 CMD8S
DIN: 40 CrMnMoS 8.6
WERKSTOFF Nb: 1.2312
AISI: ≈ P20

Chemical Analysis
Typical values (weight%)

C	S	P max	Si	Mn	Cr	Mo
.4	.060	.012	.3	1.5	1.9	.2

Mechanical Properties

	Hardness	YS 0.2		UTS		Elongation	Reduction of area	Elastic modulus
	HB	MPa	ksi	MPa	ksi	%	Z%	GPa	ksi
Longitudinal direction	300	850	123	1270	184	10	45	205	29745
Longitudinal direction	300	820	119	990	144	9	40	205	29745

Delivery Conditions
Dimensional program

Thickness	Width
20 – 120 mm (.79″ – 4.7″)	1500 – 2500 mm (59″ – 98.4″)
120 – 350 mm (4.7″ – 14″)	1500 – 2100 mm (49″ – 82.7″)

PDF: http://www.industeel.info/products/steels-for-molds-tools-and-die/moulds-cores-and-cavities/2312-2/