91中文精品,污污的视频免费在线观看,91就要激情,精品黄色网,欧美精品看片,久久久久久a亚洲欧洲aⅴ,天天干天天色综合网

Casus Products>> Casus

  The Q17Cr3-Bproduced by XINGTAI STEEL has the advantages of stable composition, low harmful elements, high purity of steel, small decarbonization layer and less surface defects. A customer of XINGTAI STEEL used the product to produce piston pin of passenger car engine, which reflected that the product was easy to spheroidize annealing, low cold heading cracking rate, stable heat treatment quality, good hardenability and uniform hardness.