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
    steel for anchor-chain Products>> Main Products>> steel for anchor-chain
    Products Grade: 25MnV
    Specifications: φ10~30mm
    Applied Standard:  GB/T 10560—89
    Characteristics: 25MnV is mainly used for the manufacture of High Strength Circular Chain Of transporter and slicer for coal mine.
    Applications: Common mechanical steel
    Use of Products: The Mine High Strength Circular Chain Steel strictly controlled chemical content and the inclusions,low harmful elements and good surface quality. Through the reasonable control of the chemical content and the optimization the rollings, the product has excellent hardenability.