Bearings

Applications

Similar to that of AISI 420C balls, when required hardness and wear resistance are lower.

Type

%Si

%Mn

%Cr

420A

0.16-0.25

1.00 max

1.50 max

0.040 max

0.030 max

12.00-14.00

420B

0.26-0.35

1.00 max

1.50 max

0.040 max

0.030 max

12.00-14.00

ITA

USA

GER

FRA

RUS

CHN

JAP

X20Cr13

420A

1.4021

Z 20 C 13

420 S 37

20 Kh 13

2Cr13

420J1

X30Cr13

420B

1.4028

Z 33 C 13

420 S 45

30 Kh 13

3Cr13

420J2

Property

Symbol

U.o.M.

Type

Notes

Values

Density

[g/cm3]

Physical

Room temp.

7.73

Young's modulus

[GPa]

Mechanical

195

Specific heat

[J/kg-K]

Thermal

Room temp.

450

Coefficient of linear thermal expansion

[10^-6/ºC]

Thermal

(?T=0-100°C)

10.2

Thermal conductivity

[W/(m·K)]

Thermal

Room temp.

27.4

Electric resistivity

[O*m*10^-9]

Electric

680

Relative magnetic permeability

Magnetic

Not hardened

>600

Property

Type

U.o.M.

Values

U.o.M.

Values

Hardness

Mechanical

[HRC]

48 - 58

Ultimate tensile strength

Mechanical

[MPa]

1700 - 1900

[psix10^3]

250 - 275

Service temperature

Thermal

[ºC]

0 - 400

[ºF]

32 - 752

Diameters (min/max)

U.o.M.

Diameters (min/max)

U.o.M.

Precision Grade (ISO 3290)

0.300 - 300.000

[mm]

1/64 - 12

["]

G10-16-20-25-28-40-50-60-100-200-500-1000-2000

Corrosion Resistance

AISI 420A/420B steels offer a corrosion resistance similar to 420C steel. Balls of these materials resist in contact with water, steam, oil and petrol.

Martensitic hardened stainless steel balls, they feature good hardness, corrosion resistance, wear and abrasion resistance. Balls are provided in the passivated condition.

Applications
Special bearings, anti-friction bearings, special pumps, recirculating balls, lighters, pens, automotive seatbelts & components.

Chemical composition

%C	%Si	%Mn	%P	%S	%Cr	-	-	-	-	-	-
0.43-0.50	1.00 max	1.00 max	0.040 max	0.030 max	12.50-14.50	-	-	-	-	-	-

International standards

ITA	USA	GER	FRA	UK	RUS	CHN	JAP
X46Cr13	420C	1.4034	Z 34 C 14	-	40 Kh 13	4Cr13	-

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	7.70
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)	10.4
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	27.6
Electric resistivity	?	[Om10^-9]	Electric	-	720
Relative magnetic permeability	µ	-	Magnetic	Not hardened	> 600

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[HRC]	52 - 60	-	-
Ultimate tensile strength	Mechanical	[MPa]	1700 - 1900	[psix10^3]	250 - 275
Service temperature	Thermal	[ºC]	0 - 400	[ºF]	32 - 752

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade (ISO 3290)
0.300 - 300.000	[mm]	1/64 - 12	["]	G10-16-20-25-28-40-50-60-100-200-500-1000-2000

Corrosion Resistance
Good corrosion resistance in industrial atmosphere, freshwater, steam, alcool, ammonium, several oilfield products and organic compounds, dairy products, mild acid environments. Fairish in foodstuff and alkaline solutions. Fair in salt atmosphere. It does not resist in contact with sea water and strong acids (even if diluted).