久久中文字幕一区二区三区,日本99热,高清av一区,日韩狠狠操,久久久一本精品99久久精品66,1级片网站,aaaaaaa欧美黄色大片

Main Products
Products Grade: 30MnVS6
Specifications: φ15-25mm
Applied Standard:  agreement
Characteristics: ball studs
Applications: steering system parts
Use of Products: This grade has the feature of stable chemical composition and mechanical property, minor decarburization, good surface quality,homogeneous microscopic structure.cost-saving for quenched and temperde exemption, deformation from quenched and temperde avoidance.