drywall screws for heavy items

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drywall screws for heavy items

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  • A. When the thickness of the plating is 3-4 mm, the zinc adhesion should be less than 460g/m, that is, the average thickness of the zinc layer is not less than 65 microns.

    drywall screws for heavy items

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    drywall screws for heavy items drywall screws for heavy items

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  • drywall screws for heavy items

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    drywall screws for heavy items drywall screws for heavy items

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  • 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.

    drywall screws for heavy items

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    drywall screws for heavy items drywall screws for heavy items

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  • drywall screws for heavy items

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    drywall screws for heavy items drywall screws for heavy items

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