九一精品一区,色戒梁朝伟和汤唯无删减版在线观看未删减版,伊人中文字幕在线观看,亚洲男人在线,五月婷婷之婷婷,色戒完整版无删减在线观看,天堂成人一区二区三区

Main Products
Products Grade: 12CrMo4
Specifications: φ5.5~16mm
Applied Standard:  agreement
Characteristics: It's used to produce the engine vavle spring retainer
Applications: Common parts
Use of Products: 12CrMo4 is a commen steel grade which used to producethe engine vavle spring retainer. This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties ,stable heat-treatment properties and good hardenability