722M24 – 3% Cr – Mo Nitriding Steel

722M24 is a 3% Chromium – Molybdenum Medium Strength Nitriding steel

It is generally supplied in the quenched and tempered condition to ~925Mpa tensile strength, whilst still maintaining excellent ductility and impact strength, and can be nitrided to produce a very hard wear resistant case (Upto 950HV).

Typical applications include high integrity high speed precision gears in the aerospace and automotive industries.

RELATED SPECIFICATIONS 722M24 – 3% – Mo Nitriding Steel
				BS970 – 1955 EN40B W.Nr. 1.7361 DIN 32CrMo12
TYPICAL CHEMICAL COMPOSITION
NOTE For Nitriding applications 4 x P + Sn <= 0.12%				Carbon		0.25%
				Manganese		0.55%
				Phosphorous		**
				Tin		**
				Chromium		3.25%
				Molybdenum		0.55%

MECHANICAL PROPERTY REQUIREMENTS – Annealed condition
Yield		Tensile Strength		Elongation		Hardness

TYPICAL CORE PROPERTIES
Condition	Rulling Section	Tensile Strength Mpa	Yield (0.2%) Mpa	Elongation %	Izod Ftlbs	Charpy J	Hardness HB
T	250mm	850/1000	635	13	30	35	248-302
U	150mm	925/1075	740	12	35	42	269-331
FORGING
Forging temperature for this material 850 – 1150oC
HEAT TREATMENT
Hardening – Heat to 880 – 910oC and hold for time commensurate with the ruling section, quench in oil
Tempering – Heat to 570 – 700oC, dependent on required strength, for a time commensurate with ruling section, air cool
Nitriding – Heat to 500oC in an atmosphere of 20% dissociated ammonia gas for approximately 80hours. This will give typical nitride case depth of 0.5mm The relatively low temperature of the nitriding process gives a scale free surface with little/no distortion.
MACHINING
Material is readily machinable, dependent on condition, and operations such as sawing, turning, milling etc can be accomplished satisfactorily using standard machine tool manufacturers recommended speeds and feeds.

722M24 – 3% CR – MO NITRIDING STEEL