1.7243/18CrMo4

CARBURISING STEEL

NORM: PN-EN 10084:2002

APPLICATION:

Steel susceptible to the parts which require core tensil strength and high hardness. Susceptible to the parts with variable wearing resistance and loading such as: gears, screws, bolts, bushing, camshafts.

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 annealing (+A)		HB	≤ 207
Heat treatment (carburising, quenching and tempering) (+QT)		HRC	≥ 60
Ultimate tensile strength Rm, after quenching and tempering at 200 °C:
Diameter, d, mm	d ≤ 16	16 < d ≤ 40	40 < d ≤ 100
Rm, MPa	1050	850	680

PHYSICAL PROPERTIES:

Property	Unit	Value
Density, ρ	g·cm-3	7.85

HARDENABILITY:

EN10084:2008	Jominity test HRC mm (mm distance from quenched end)
	1.5	3	5	7	9	11	13	15	20	25	30	35	40
max.	47	46	45	42	39	37	35	34	31	29	28	27	26
min.	39	37	34	30	27	24	22	21	–	–	–	–	–

Technological treatment processes:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	1050 – 850
	Rolling		+	1050 – 850
Thermochemical treatment	Carburising		+	880 – 980
	Carbonitriding		+	860 – 950
Heat treatment	Annealing	Normalising	+	870 – 910
		Soft annealing	+	680 – 700
	Heat treatment after carburising1)	Core hardening	+	860 – 900
		Intermediate annealing	+	670 – 720
		Case hardening	+	780 – 820
		Tempering	+	150 – 200
1) If possible, hardening has to be performed with the temperature equal or close to the heat treatment temperature

INTERNATIONAL STEEL GRADES: