W.NR. 12316

Pre-hardened stainless martensitic chrome- molybdenum steel with excellent resistance to corrosion, higher than similar Cr grades (i.e. WW.NR. 1.2083), good polishing and photoengraving properties.

Its applications are equipments and plastic moulds, particularly for corrosive plastic as PVD.

Comparable standards

DIN	W.Nr	AFNOR	JIS
X36CrMo17	1.2316	~Z35CD17	SUS420J

Chemical composition (typical; in weight %)

C	Si	Mn	P (max)	S (max)	Cr	Mo	Ni
0.33-0.43	<0.005	<1.50	0.03	0.03	15.50-17.50	0.80-1.30	<1.00

Production technology

EAF – LF – VD - Forging – Heat treatment QT

US specification

In according to standard EN10228-3 Class 4 and standard SEP 1921 Class E/e

Delivery condition

WW.NR. 1.2316 is delivered in quenched and tempered condition, with hardness range 280 - 325 HB (29 – 35 HRC) or in annealed condition with hardness max 240 HB (23 HRC)

Critical points

Ac1 800 °C

Ac3 910 °C

Ms 200 °C

Physical properties (reference values)

	20°C	100°C	250°C	500°C
Thermal expansion coefficient (10-6/K)	10.4	10.7	11	11.9
Thermal conductivity (W/mk)	23.5	23.9	24.2	23.2
Young modulus (Kn/mm2)	218	209	202	180

Heat treatment

TREATMENT		TEMPERATURE	HOLDING TIME (HT)	COOLING	COMMENTS
Annealing		Heat to 770 - 820 °C	Min. H.T. for 2 minute /mm	Furnace up to 600°C than in air	-
Stress relieving		Heat to 550 - 600 °C	Min. H.T. for 2 minute /mm	Air or furnace	To be carried out after machining, is recommended to eliminate the residual stresses induced by mechanical working
Hardening		Preheating to 600-700°C Austenitizing to 1000 - 1050 °C	Min. H.T. for 1 minute /mm	Polymer or gas air	Qunched hardness 50 HRC
Tempering		-	-	Air	To be carried out after hardening. 2nd Tempering must be performed to max 30°C below tempering temperature