W.NR. 1.2379

Main characteristics and applications

Threading rolls and dies, cold extrusion tools, trimming, cutting and stamping tools for sheet thicknesses up to 6 mm, precision cutting tools for sheet thicknesses up to 12 mm, cold pilger mandrels, circular-shear blades, deep-drawing tools, pressure pads and highly wear-resistant plastic moulds.

Comparable standards

DIN	W.Nr	AFNOR	AISI/ASIM	JIS
X155CrVMo12-1	1.2379	Z160CDV12	D-2	SKD11

Chemical composition (typical; in weight %)

C	Si	Mn	P (max)	S (max)	Cr	Mo	V
1.45-1.60	0.10-0.60	0.20-0.60	0.03	0.03	11.0-13.0	0.70-1.00	0.70-1.00

Physical properties (reference values)

	20°C	100°C	250°C	500°C
Coefficient of thermal expansion at °C 10-6 m/(W/mk)	10.5	11.5	11.9	12.2
Thermal conductivity at °C (W/mk)	16.7	20.5	24.2	-

Steel properties

12 % ledeburitic chromium steel. Combines maximum wear resistance, good toughness, outstanding cutting edge retention and tempering resistance. It can be nitrided after special heat treatment.

Heat treatment

TREATMENT		TEMPERATURE	HOLDING TIME (HT)	COOLING	HARDNESS
Annealing		Heat to 830 – 860 °C	Min. H.T. for 2 minute /mm	Furnace	-
Stress relieving		Heat to 650 – 700 °C	Min. H.T. for 2 minute /mm	furnace	-
Hardening		Heat to 1000 – 1050 °C	Min. H.T. for 1 minute /mm	Air, oil or saltbath, 500 – 550 °C	-

Note

12379-dropdown-icon Hardening temperature 1050-1080 °C, tempered 3 times
Chart of tempering values depending on the hardness

°C	100	200	300	400	500	525	550	600
HRC	63	61	58	58	58	60	56	50

Time-temperature transformation diagram Hardening temperature: 1030 °C

Tempering diagram