RODUR
X2 NiCoMo18-9-5+Ti

*Unified Numbering System (USA)

Characteristics and main uses

• Superior formability, elevated mechanical properties by precipitation hardening through heat treatment at moderate temperature (which can be carried out after forming). 
• Hardening treatment does not cause any dimensional change.
• No low-temperature embrittlement.
• Excellent fatigue-resistance.
• Structural stability after ageing.
• A low thermoelastic coefficient.
• Excellent weldability. Post-weld hardening treatment enables significant reduction of differences in properties between welded and non-welded zones, thus eliminating weak spots.

Main uses

• Springs for clock motors.
• Springs for rough watch movements.
• Form springs for analogue quartz watches.
• Springs for miscellaneous applications.
• Weighing machines.
• Precision ball bearings.
• Ball bearing cages.
• Electrical and electronic apparatuses.
• Plastics industry.
• Defense industry.
• Missile and rocket fins.
• Satellites.
• Automatic gearbox belt.
• Printer type-carrying band.

1 poor | 2 average | 3 good | 4 very good | - no info

Comments on heat treatments

Aging hardening of martensite

Heat treatment condition

• The standard final aging treatment is 3 hours at 480 ° C. This heat treatment creates the precipitation of intermetallic component. This treatment can be combined with cold rolling hardening.
• Although the air treatment does not alter the properties of the material, it does alter its appearance, with the metal taking on a blue tint. For this reason, we recommend treating under a high vacuum of the order of 10-5 Torr or under an inert atmosphere such as argon.
• Certain atmospheres considered inert due to the absence of coloring are in fact chemically active and can thus make the material extremely brittle. This is especially true in the case of hydrogen and cracked ammonia.
• The influence of the operating temperature. Following tempering, the tensile strengths and elasticity of this alloy decrease more slowly with temperature than those of spring steels or 18-8 stainless steels. This is due to the blocking of the dislocations by the precipitates formed during the quench treatment. The variations in elastic modulus (Young's modulus) as a function of temperature are similar to those of other alloys.