国产一级精品成人久久av无码免费,日韩在线看片中文字幕不卡,中文字幕在线激情日韩一区,日韩欧美成人免费中文字幕,国产精品一区二区免费看,日韩欧美一区二区三区在线视频,中文字幕在线免费视频,中文字幕精品视频在线观看,国产日韩不卡免费精品视频,日韩中文字幕电影在线观看,91精品乱码一区二区三区熟女精品,亚洲欧洲在线观看精品,日韩中文字幕福利电影

Main Products
Products Grade: GSCM435-C、QSCM435-C、QSCM435-C(SCM435))、QSCM435-MT
Specifications: φ5.5-42mm
Applied Standard:  agreement
Characteristics: high strength fasteners for engineering vehicles.
Applications: high-end parts
Use of Products: GSCM435-C is a commen steel grade which used to produce high strength bolt of class 12.9.This product has characteristics of uniform-chemical composition, low harmful elements, high purity, low decarburisation, good surface quality. Good spheroidization quality, low crack ratio in cold heading,stable heat-treatment properties and uniform hardenability.