PRODUCT NAME :
bearing steel

STANDARD:
GB/T18254-2002 ISO683-17
GRADE COMPARISION:

GB	ASTM	BS	JIS	DIN
9Cr18Mo	440C		SUS440C	21

ULTRASONIC STANDARD:
GB/T6402-2008 / SEP921-84.  ASTM A388

CHEMICAL COMPOSITION:

C	Si	Mn	P≤	S≤	Cr	Mo
0.95/1.10	≤0.8	≤0.8	0.035	0.03	16.0/18.0	0.40/0.70

HEAT TREATMENT SPECIFICATION:

Annealing :800～920℃ cooling , quenching :1000～1050℃ oil cooling , tempering :200～　300℃ air cooling.
Metallographic structure: martensite .

MECHANICAL PROPERTIES:
hardness ≤255HB; after Q&T≥55HRC

DELIVERY CONDITION : annealed

DIMENSION : mm

ROUND STEEL BAR		COIL ROD	WIRE	SQUARE/ FLAT
FORGED BAR	ROLLED BAR	HOT ROLLED	COLD DRAW	FORGED	ROLLED
100-700	16-250	∮5.5-20	∮0.2-13	120-800×120-800	5-38×44-150 10-90×60-305

APPLIED RANGE:
Bearing steel is the general term for alloy steel used in the manufacture of bearing races and moving parts of all types of roller
bearings. High carbon and chromium bearing steel is widely applied in the manufacture of pin rollers and sleeves on driving shaft
used in auto components, construction machinery, combustion engines, electric locomotive, machine tools, tractors, steel rolling
equipment, and drilling and exploration equipment for mining industry. Carburized bearing steel is mainly used in railway locomotives
and wind turbines. The high-grade bearing steel products developed with proprietary technology have been highly appraised by six
leading bearing manufacturers in the world.

REMARK：
Above listed parameters and sepcification only for reference . Specific parameters according to standard. Requirments beyond standard
will be negotiate by both sides .
Delivery state:annealed, spheroidal annealed, quenched & tempered ,bright bar, cold-drawn, etc.
Listed specifications are only typical grades; products of required specifications can be developed/produced per international, Chinese or
industry standards, or based on agreements with customers.