Alloy steel plate

      With the development of science, technology and industry, higher requirements are put forward for materials, such as higher strength, high temperature, high pressure, low temperature, corrosion resistance, wear resistance and other special physical and chemical properties. To meet the requirements, alloy steel plates appeared.

      Alloy round steel

      Round steel refers to a solid long strip of steel with a circular cross-section. Its specifications are expressed in diameter in millimeters (mm), such as "50mm", which means round steel with a diameter of 50 mm.

      < 1 >
      啊灬嗯用力张开腿视频免费_啊灬用力灬啊灬啊灬啊灬_啊轻点灬JI巴又大又粗