国家/地区 中国（2）
IPC部 B（2）
IPC大类 C09（2） C23（2）
IPC小类 C09D（2）
IPC C09D007/61（2）
发明人
公开年
申请年 2022（2）
专利权人

Manufacturing high strength alloy steel bolt comprises taking steel for bolt, performing extrusion, hot upsetting, heat treatment and thread machining to obtain bolt blank, and performing galvanizing and zinc-aluminum coating into bolt blank.

ZHOU H

Surface coating of copper roller of belt furnace used for neodymium-iron-boron material, comprises silica gel coating comprising silicate and water catalyzing by acidic catalyst.

QIU X