久久久久久国产一区二区三区,天天狠天天操,国产乱码久久久久久一区二区,黄色短视频免费观看,日日噜噜夜夜爽狠狠视频 ,午夜激情啪啪,不卡的av电影在线

Main Products
Products Grade: 430FR,0Cr17Mo2S
Specifications: Φ5.5-38 mm
Applied Standard:  agreement
Characteristics: electromagnetic valve core etc
Applications: soft-magnetic stainless st…
Use of Products: 430FR,0Cr17Mo2S is a soft-magnetic free-cutting stainless steel,adding Si、S、Mo in the base steel 0Cr17,it have low coercive force、good corrosion resistance and good cutting performance.