Bearings

Non-Hardenable AISI 430

Ferritic unhardened stainless steel balls, they show good mechanical features and corrosion resistance better than martensitic stainless steels. Balls are provided in the passivated conditions.

Applications
Special bearings and valves, cosmetic nail polish, sprayers, heat exchangers, measurement instruments.

Chemical composition

Type	%C	%Si	%Mn	%P	%S	%Cr	-	-	-	-	-
430	0.120 max	1.00 max	1.00 max	0.040 max	0.030 max	16.00-18.00	-	-	-	-	-
430F	0.120 max	1.00 max	1.25 max	0.065 max	0.150 min	16.00-18.00	-	-	-	-	-

International standards

ITA	USA	GER	FRA	UK	RUS	CHN	JAP
X6Cr17	430	1.4016	Z8C17	430S17	12KH17	1Cr17	SUS 430
X14CrMoS17	430F	1.4104	Z10CF17	441S29	-	YCr17	SUS 430 F

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	7.73
Young's modulus	E	[GPa]	Mechanical	-	205
Specific heat	c	[J/kg-K]	Thermal	Room temp.	450
Coefficient of linear thermal expansion	a	[10^-6/ºC]	Thermal	(?T=0-100°C)	11
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	24.0
Electric resistivity	?	[Om10^-9]	Electric	-	625
Relative magnetic permeability	µ	-	Magnetic	Ferromagnetic	> 600

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[HRB]	75 - 95	-	-
Ultimate tensile strength	Mechanical	[MPa]	750 - 950	[psix10^3]	107 - 140
Service temperature	Thermal	[ºC]	0 / 450	[ºF]	32 / 842

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade (ISO 3290)
0.300 - 180.000	[mm]	1/64 - 7	["]	G10-16-20-25-28-40-60-100-200-500-1000

Corrosion Resistance
430 balls resist in freshwater, steam, air, detergents, soaps, organic and oxidating acids, alkaline solutions. They do not resist to chloride, fluoride, bromide, iodide solutions. The corrosion resistance is lower than AISI 302/304 steels.

Non-Hardenable AISI 201

Cr-Mn stainless steel balls, with properties similar to AISI 302/304 balls (slightly higher mechanical characteristics). Balls are provided in the passivated condition.

Applications
Special bearings, automotive components, switches, die casting devices. They are widely used in the electronic industry.

Chemical composition

%C	%Si	%Mn	%P	%S	%Cr	%Ni	%N	-	-	-	-
0.15 max	1.00 max	5.50-7.50	0.060 max	0.030 max	16.00-18.00	3.50-5.50	0.250 max	-	-	-	-

International standards

ITA	USA	GER	FRA	UK	RUS	CHN	JAP
-	201	1.4372	Z12CMN17-07Az	201 S 01	14Ch18N4G4L	1Cr17Mn6Ni5N	SUS 201

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	7.85
Young's modulus	E	[GPa]	Mechanical	-	200
Specific heat	c	[J/kg-K]	Thermal	Room temp.	480
Coefficient of linear thermal expansion	a	[10^-6/ºC]	Thermal	(?T=0-100°C)	16.3
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	15.6
Electric resistivity	?	[Om10^-9]	Electric	-	720
Relative magnetic permeability	µ	-	Magnetic	Paramagnetic	1.03

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[HRC]	25 - 39	-	-
Ultimate tensile strength	Mechanical	[MPa]	690 - 1240	[psix10^3]	100 - 180
Service temperature	Thermal	[ºC]	-196 / 700	[ºF]	-320.8 / 1697

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade (ISO 3290)
0.800 - 180.000	[mm]	1/32 - 7	["]	G28-40-60-100-200-500-1000

Corrosion Resistance
Similar to the corrosion resistance of AISI 302/304 materials.

Non-Hardenable AISI 303

Austenitic AISI 303 stainless steel balls, it is characterised by the best workability properties between stainless steels, thanks to the high sulphur content. Balls are provided in the passivated state. They are obtained by a hot forging process.

Applications
Special valves, stud knobs.

Chemical composition

%C	%Si	%Mn	%P	%S	%Cr	%Ni	-	-	-	-	-
0.15 max	1.00 max	2.00 max	0.200 max	0.150 min	17.00-19.00	8.00-10.00	-	-	-	-	-

International standards

ITA	USA	GER	FRA	UK	RUS	CHN	JAP
X8CrNiS18-9	303	1.4305	Z 8 CNF 18-09	303S31	12CH18N10E	Y1Cr18Ni9	SUS303

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	7.97
Young's modulus	E	[GPa]	Mechanical	-	198
Specific heat	c	[J/kg-K]	Thermal	Room temp.	500
Coefficient of linear thermal expansion	a	[10^-6/ºC]	Thermal	(?T=0-100°C)	16.7
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	15.2
Electric resistivity	?	[Om10^-9]	Electric	-	715
Relative magnetic permeability	µ	-	Magnetic	Paramagnetic	1.020

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[HB]	170 - 270	-	-
Ultimate tensile strength	Mechanical	[MPa]	500 - 1300	[psix10^3]	72 - 188
Service temperature	Thermal	[ºC]	-196 / 200	[ºF]	-320.8 / 392

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade (ISO 3290)
0.800 - 180.000	[mm]	1/32 - 7	["]	G100-200-500-1000

Corrosion Resistance
The corrosion resistance is lower than AISI 302/304 steels, causing to the high S content that favour pitting corrosion. Steel not recommended for sea water applications.