精品国产一区二区三区在线观看,中文字幕在线观看不卡视频,超碰97在线播放,手机看片福利久久,成人精品毛片va一区二区三区,欧美伊人久久,国产伦精品一区二区三区视频孕妇

Main Products
Products Grade: 55SiCrA,55SiCrA-1
Specifications: φ5.5-22mm
Applied Standard:  agreement
Characteristics: suspension spring\valve spring\mechanical spring
Applications: Suspension spring steelSpring steel
Use of Products: The wire rod of 55SiCrA, which is common steel grade to produce suspension spring and valve spring widely used in automobile and motorcycle Industries, has characteristics of uniform-chemical composition, low gas content and harmful elements, high purity, slight decarburisation, good surface quality and drawability as well as consistent heat-treatment quality.