1 Cast iron. 2 Material: QT450-12. 3 Specification: all kinds, OEM accepted. Shandong Changning Group Co.,Ltd, whose area is 400 thousand square meters and total asset is RMB550 million with RMB185.6 million fixed asset, has one parent firm Shandong Changning Group Co., Ltd.and four subsidiary companies which are Weifang Changrong Machinery Co., Ltd. ,Changyi Changrong Machinery Co., Ltd., ...