WelcomeNingguo Zhongyi Wear-resistant Material Co., Ltd.

ProductsProduct

Medium chromium

Date:2015-01-30    Views:1957

Among the following materials, zqcr8.zqcr5.is the material grade in GB / t17445-2009. Super hard medium chromium is the material independently developed by our company

久久99精品久久久久久艹