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: SCM420
Specifications: φ5.5~38mm
Applied Standard:  agreement
Characteristics: It's used to produce the engine vavle push rod.
Applications: Common partsCommon fastener
Use of Products: This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties. And the product has excellent hardenability.