国产欧美激情日韩成人三区|成A∨人片在线观看无码|91欧美精品午夜性色福利在线|亚洲一级黄色,男人的天堂久久久,久久综合操,国产超级乱淫视频播放免费

Main Products
Products Grade: 65Mn
Specifications: φ5.5~14mm
Applied Standard:  GB/T4354
Characteristics: The product is a common spring steel with extensive applications. It mainly used to manufacture cushion spring, clockwork spring, oil pump speed adjusting spring, plunger spring, absorber spring, clutch spring and brake spring etc.
Applications: Spring steel
Use of Products: This product has characteristics of good metallurgical quality such as high purity and uniformity, good surface quality by strictly controlling surface defect and decarburization, good mechanical properties especially on elastic limit, strength limit and tensile ratio, as well as accurate shape and dimension.