三级片a片无码_蜜乳AV成人电影_丝袜足交视频在线_日韩精品中文字幕亚洲专区腿精_安徽搡BBBB槡BBBB_欧美日B操B_非洲AV成人无码久久精品_av尤物_www.亚洲黄_WWWWWW美国黄片_蜜乳av影视_久久久亚洲成人AV无码电影_A片免费看在线不卡_国产无码8区_日屄福利视频

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.