Ningbo Yongye Smelt & Casting Co., Ltd was founded in 1998, which is an export-oriented enterprise, specializing in producing engineering machinery wear-resistant parts, such as excavator teeth, valve parts, undercarriage parts, and etc.he material standards adopted include National Standard GB, United States Standard ASTM. AISI, Germany Standard DIN, Japan Standard JIS, British Standard BS. The applications of our products cover ....