6x2 drywall screws

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  • There are many production links of blade barbed rope, and the finished product can only be produced after several times of production. Roughly, there are four or five links.

  • The production of large rolls of galvanized wire iron can be divided into two categories, is directly from the iron ore after iron stroke exercise out of the metal, the composition of the ore is iron oxide, silica and other miscellaneous stone.

  • Deoxygenation of boiling steel is incomplete, oxygen content is high, phosphorus and other impurities distribution is uneven, local overspending, aging sensitivity and cold brittle sensitivity are high, hot cracking tendency is added. If unqualified electrode is used, if the content of carbon and sulfur in the weld metal is too high, cracks will occur. For example, when factories use acidic electrodes to weld Q235-A steel, the high carbon fernoganese in the electrode coating will lead to thermal cracks in the weld.

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