不卡视频一区二区三区,婷婷成人av,国产精品一区视频,久久夜色精品国产噜噜av小说,国产精品性夜天天视频,亚洲日产永久经典,九九国产精品入口麻豆

Main Products
Products Grade: SWRCH6A,SWRCH7A,SWRCH8A
Specifications: φ5.5～42mm
Applied Standard:  Q/XG 114
Characteristics: adapted for all kinds of low intension standard-part and nonstandard -part.
Applications: Common partsCommon fastenerconstruction fastener steel
Use of Products: Steel SWRCH6A and SWRCH8A are the common using steels produced the Fasteners of low intension and big deformation and the nonstandard-part. The productions have advantages of steady composition, low harmful element, high pure steel and small surface defect. Using them, it is unnecessary to heat treatment and the rate craze of cold forging is low. They are used in the industry of family electricity, traffic, mechanism and transport.The steel grade gains the gold-cup of the metallurgical product actual quality in 2007.