国内精品久久久久久久日韩,成人国产视频在线观看,亚洲精品国产一区二区,少妇一级淫片免费放在线,视色av,国产精品美女久久久av,蜜桃av网站

Main Products
Products Grade: ML45Mn2
Specifications: Φ14~38mm
Applied Standard:  agreement
Characteristics: or manufacturing rivet of boxcar.
Applications: Fastener steel
Use of Products: uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality,are commen steel grade .After spheroidize annealing, this product has characteristics of good cold heading properties ,stable heat-treatment properties, good hardenability.