AISI 440C Stainless Steel Balls

AISI 440C STAINLESS STEEL BALLSMartensitic hardened stainless steel balls, they feature remarkable hardness, wear resist

AISI 440C STAINLESS STEEL BALLS

Martensitic hardened stainless steel balls, they feature remarkable hardness, wear resistance, surface finishing, narrow dimensional tolerances.

For that reason this type of steel is frequently used in precision devices. Balls are provided in the passivated condition.

Applications

Precision bearings, anti-friction bearings, special valves, conveyor belts and rollers, ballpoint pens.

They are used in foodstuff, medical instruments, quick couplings, recirculating ball bearings, knotting devices, oil refinery devices.

Chemical Composition（%）

Type	C	Si	Mn	P	S	Cr	Mo
440C	0.95-1.20	1.00 max	1.00 max	0.040 max	0.030 max	16.00-18.00	0.75 max

International Standards

USA	GER	FRA	UK	RUS	CHN	ITA	JAP
440C	1.4125	Z100CD17	-	95X18	9Cr18Mo	X105CrMo17	SUS440C

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Value
Density	δ	g/cm³	Physical	Room temp.	7.75
Young's modulus	E	GPa	Mechanical	-	210
Specific heat	c	J/（kg·℃）	Thermal	Room temp.	450
Coefficient of linear thermal expansion	α	10^-6/ºC	Thermal	(ΔT=0-100°C)	10.2
Thermal conductivity	λ	W/(m·K)	Thermal	Room temp.	19.6
Electric resistivity	ρ	Ωm10^-9	Electric	-	680
Relative magnetic permeability	µ	-	Magnetic	Ferromagnetic	>700

Technical data

Property	Type	U.o.M.	Value	U.o.M.	Value
Hardness	Mechanical	HRC	57-65	-	-
Ultimate compressive strength	Mechanical	MPa	1900-2000	psi*10³	275-290
Service temperature	Thermal	ºC	0-400	ºF	32-752

Range

Diameters	U.o.M.	Diameters	U.o.M.	Precision Grade (ISO 3290)
1.588 - 304.800	mm	1/64 - 12	inch	G40 -......- G2000

Corrosion Resistance

The material resists to corrosion in contact with freshwater, steam, oil, petrol, alcohol.

They are subjected to pitting corrosion in sea water environments.

Poor corrosion resistance in acid environments.