SPECIFICATION
Nominal diameter	Diameter Tolerance	Weight of single ball in average	Surface hardness	Impact toughness
(mm)	(mm)	(g)	(HRC)	(J/cm2)
Φ60	+3  -2	888	60-64	8-10 (ball mill)  ≥14 (semi-autogenous mill)
Φ70		1410
Φ80		2104
Φ90		2996
Φ100		4110
Φ110	+4  -2	5457	60-64
Φ120		7102
Φ130		9030
Φ140	+4  -3	11278

Chengde Rongmao Cast Steel Co.,Ltd. Founded in 1980s, and located in historic and cultural city - Chengde China, is a large-scale casting & forging enterprise. For thirty years Rong Mao has produced Austempered Ductile Iron (ADI) grinding ball,F, ball mill liner, various models of jaw crusher tooth plate, hammer crusher liner, castor-oil plant section, high-chromium alloy combined hammer and all kinds of high manganese steel castings. the company has 400 staff, including technical management personnel of 80 and 30 with senior and medium professional titles, and its plant covers an area of 36,000 square meters, with workshop area of 26,000 square meters and fixed assets of 200 million yuan. the annual output is 100,000 tons.

Rong Mao Cast Steel Co.,Ltd manufacture grinding balls,  for mining, SAG/ball mill liner, alloy/crusher hammer, forged grinding ball in China.