... copper materials are supplied by Chinalco Luoyang Copper Co., Ltd. that is the best copper supplier in China,all ... and Ti alloy factory . for example China First Heavy Industries (CFHI),China National Erzhong Group Co.,Dongbei Special Steel Group ... Co., Ltd.,Daye Special Steel Co.,Ltd.,Xining Special Steel Co., Ltd.,Tiangong International Co., Ltd., etc.,and Tiangong International Co., Ltd. always ...