日韩欧美在线视频免费,黄色国产91,欧美日韩亚洲国产,最近中文字幕在线,性高爱久久久久久久久,亚洲精品午夜不卡,一区二区三区福利视频

Main Products
steel for machine structure Products>> Main Products>> steel for machine structure
Products Grade: 20CrMo
Specifications: φ5.5～38mm
Applied Standard:  GB/T 3077
Characteristics: As usual,this product is used to produce the automobile and motorcycle accessories,mechanical gear.
Applications: Common partsCommon fastenerconstruction fastener steel
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.