国产 在线 一区二区三区_亚洲国产精品欧美日韩一区二区_在线观看不卡av电影_国产日韩久久免费福利网站

Main Products
Products Grade: B7
Specifications: φ5.5-38mm
Applied Standard:  agreement
Characteristics: Cold Forging Steel
Applications: High strength fastenerCommon parts
Use of Products: This grade has the feature of stable chemical composition, low harmful elements, minor decarburization, good surface quality,homogeneous properties along the coil, good plasticity and ductility.