日韩免费Av特级无码毛片|黄片录像三级黄级色片|欧美CD5s视频大全|日本A∨码与亚洲|日本黄色电影一区二区三区|日韩AV无码一区二区三区无码|亚洲无码免费看∧v在线|亚洲欧美性爱小说|最新版本国产黄色大片|97精品免费视频

JINGHONG

Contact us

郵件 : kunda@kundasteel.com

電話 : +86-635-6666969

傳真: +86-635-8881911

地址 : 山東省聊城經(jīng)濟(jì)技術(shù)開發(fā)區(qū)匯通國際金屬物流園C區(qū)116

Weathering board

Weathering Steel can be exposed to the atmosphere without painting. It begins to rust in the same way as ordinary steel. But soon the alloying elements in it cause a protective surface layer of fine-textured rust to form, thereby suppressing corrosion rate.

< 12 >