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    Metal strand having a chromium steel core and corrosion-resistant cladding
    1.
    发明授权
    Metal strand having a chromium steel core and corrosion-resistant cladding 失效
    具有铬钢芯和耐腐蚀层的金属条

    公开(公告)号：US3580706A

    公开(公告)日：1971-05-25

    申请号：US3580706D

    申请日：1967-12-28

    Applicant: TEXAS INSTRUMENTS INC

    Inventor： FRIELING GERALD H JR

    IPC: B23K20/04 ,  B32B15/00

    CPC classification number: B23K20/04 ,  Y10T428/12778 ,  Y10T428/12806 ,  Y10T428/12882 ,  Y10T428/12924

    Abstract: AN AUSTENITIC CHROMIUM STEEL CORE, FROM THE SURFACE OF WHICH CHROMIUM OXIDE HAS BEEN REMOVED, IN A CLEANING SOLUTION IS BACK-PLATED IN THE SOLUTION WITH A SOLIDPHASE BONDABLE CHROMIUM-FREE METAL, SUCH AS COPPER OR A PRECIOUS METAL SUCH AS, FOR EXAMPLE, SILVER, GOLD OR THE LIKE. CLEAN STRIPS OF A CUPRONICKEL ALLOY OR TITANIUM ARE POSITIONED ON OPPOSITE SIDES OF THE PLATED CORE AND MOVED THROUGH A REDUCING ATMOSPHERE, AND THENCE DIRECTLY INTO THE BITE BETWEEN SQUEEZING ROLLS. THE CORE AND STRIPS ARE RAPIDLY HEATED IN THEIR PASSAGE THROUGH THE REDUCING ATMOSPHERE. THE ROLLS SQUEEZE THE STRIPS AROUND THE PLATED CORE TO EFFECT SOLID-PHASE BONDING BETWEEN THE STRIPS AND THE PLATING. THE MARGINS OF THE STRIPS ARE ALSO SQUEEZED TOGETHER AND BECOME SOLID-PHASE BONDED TO ONE ANOTHER. UPON EMERGENCE OF THE CLAD MATERIAL FROM THE ROLLS, IT IS AT ONCE QUICKLY COOLED IN A NITROGEN ATMOSPHERE. WASTE BEYOND THE PINCH LINES IS REMOVED. BY MEANS OF QUICK HEATING AND QUICK COOLING, EXCESSIVE PRECIPITATION IN THE STEEL OF DETRIMENTAL CARBIDES IS AVOIDED AND THE STRENGTH OF THE STEEL PRESERVED. THE PLATING SHIELDS THE STEEL CORE AGAINST THE INHERENTLY INSTANTANEOUS OXIDATION OF THE STEEL SURFACE TO CHROMIUM OXIDE WHEN EXPOSED TO AIR AND SUBSTITUTES THE MORE SLOWLY OXIDIZING SURFACE OF THE COPPER OR PRECIOUS METAL FOR EFFECTIVE SOLID-PHASE BONDING UNDER PRESSURE. THE RESULTING CUPRONICKEL OR TITANIUM SURFACE OF THE RESULTING CLAD STRAND IS CORROSION RESISTANT AND IN THE CASE OF THE CUPRONICKEL IS ANTIFOULING BECAUSE OF THE CUPRIC IONS PROVIDED THEREBY WHEN USED FOR MAKING SUBMARINE CABLES OR THE LIKE.

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