NingBo KaiCheng Bearings Manufacturing Co., Ltd. founded in 1988, It's specialized in manufacturing deep groove ball bearings, tapered roller bearings, automobile bearings, bearing collar and roller material, bearing collar etc. The high speed and low noise bearings is our mainly produces of EMQ bearings. We are own our brand of "CIE", It is of advanced productive technique, consummate device and complete testing means. As well as we have powerful strength for new products, bearing collar and roller material, bearing collar and special bearings development. Form last year, We are sales about Seventy million US$ for export, About 90% produce in our factory is for export.

Bearing collar and roller material
The best material for rolling bearing is high carbon chromium bearing steel, which features desired hardness, strong rolling fatigue resistance, wearing resistance and stable dimension. Its chemical composition is:

Chemical composition of bearing steel GCr1

Element(wt%)	C 0.95-1.05	Cr 1.40-1.65	Si 0.15-0.35	Mn 0.25-0.45	P =0.027	S =0.02
Element(wt%)	Ni <0.23	Cu =0.25	Mo =0.1	Sn <0.03	As <0.04	Ti <0.005
Element(wt%)	Sb <0.002	Pb <0.002	O<0.001	Al <0.05	Ca <0.01	-

Corresponding designation equivalent GCr15

CHINA	ISO	USA	GERMANY	JAPAN	SWEDEN
GCr15	683/XVⅡ	52100 (ASTM)	100Cr6 (DIN)	SUJ2 (JIS)	SKF3

Staintess steel

Steel No.	Chemical composition%
Steel No.	C	Si	Mn	P	S	Cr	Mo
AISI-440C	0.95-1.2	<1.0	<1.0	<0.04	<0.03	16-18	<0.75

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Category: Bearing collar and roller materials
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