超碰蜜桃|www.国产在线|北野未奈在线播放8mav|日b大片,日本aⅴ视频,99精品久久久久久久免费看蜜月,黄色专区

Xingtai Steel 35VB belongs to the high strength alloy structural steel, with the advantages ofstable composition, low harmful element, high steel purity, small decarburization layer, less surface defects, etc.While it has high strength, high impact toughness, high fatigue strength and high strength of the gap and good Cutting and welding. It is usually used in hot rolled annealed conditions, for producing high strength of connecting rod, bolts, etc.