18H2N2/1.5920/18CrNi8

CARBURISING STEEL

NORM: PN-89/H-84030/02

TECHNOLOGICAL INFORMATION:

Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)

SEMI-FINISHED PRODUCTS:

Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)

MECHANICAL PROPERTIES:

Hardness after	Symbol	Value
Soft annealimg (+A)	HB	≤ 235
Mechanical properties	Symbol	Mechanical properties after heat treatment
Ultimate tensile strength	Rm, MPa	1230 – 1470
Yield stress	Re (Rp0.2) MPa	≥ 830
Elongation	A, %	≥ 7
Reduction of area	Z, %	≥ 30
Impact energy	KV, J	–
Physical properties
Property	Unit	Value
Density, ρ	g·cm-3	7.85

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	850 – 1100
	Rolling		+	850 – 1100
Thermochemical treatment	Carburising		+	880 – 950
	Carbonitriding		+	860 – 930
Heat treatment	Annealing	Normalising	+	870 – 900
		Soft annealing	+	650 – 700
	Heat treatment after carburising1)	Core hardening	+	840 – 870
		Intermediate annealing	+	630 – 650
		Case hardening	+	800 – 830
		Tempering	+	170 – 200
1) If possible, hardening has to be performed with the temperature equal or close to the heat treatment temperature