久久一日本道色综合久久不,99久久无码一区人妻A黑,国产精品爆乳在线播放,国产精品一区无码专区

  • <b id="9ocva"></b>
  • <blockquote id="9ocva"></blockquote>
    Main Products
    Products Grade: 16MnCr5
    Specifications: φ5.5-38mm
    Applied Standard:  agreement
    Characteristics: piston pin,valve tappet,gating and other high-strength wear parts.
    Applications: Parts with steel
    Use of Products: product description:16MnCr5 hot-rolled wire rod has a good hardenability and machinability,the carburizing process prevents excessive coarsening of the grains,for large cross-section parts,after heat treatment can get a higher surface hardness and wear resistance,while maintaining excellent low temperature impact toughness.