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    NZTM Q06A G250 ZM275 Gal NZ Steel

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    Đoàn Thế Minh

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    © All Rights Reserved
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    NZTM Q06A G250 ZM275 Gal NZ Steel

    Uploaded by

    Đoàn Thế Minh
    3 views1 page

    Original Title

    NZTM-Q06A-G250-ZM275-Gal-NZ-Steel

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    3 views1 page

    NZTM Q06A G250 ZM275 Gal NZ Steel

    Uploaded by

    Đoàn Thế Minh

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    Page : 1 of 1

    Created by Technical Information Page : 1 of 1


    QA Engineer
    Revision Date No Approved by:
    02-Feb-10 03 QA Engineer
    G250 / ZM275 Gavanised (NZ) Steel Coil Specs
    NZTM-Q06A:-
    {Hot-Dipped zinc-coated with spangled}
    This internal specification covers the mechanical properties and chemical compositions of
    G250 / ZM275 Galvanised Steel coil sourced from NZ Steel and used by New Zealand Tube Mills for the
    manufacture of tube

    Zinc coating helps in two different ways of protecting steel substrate from rusting:-
    1) Barrier Effect - Protect from direct intrusion agent to the steel
    2) Galvanic Effect - Protect its adjacent steel substrate by scarifying itself

    When forming steel strip into tubular sections, the mechanical properties are affected.
    The extent of this effect depends on the specific dimensions of tube being produced and
    particularly the tube diameter to thickness ratio. In general during tube forming, the yield stress
    will be substantially increased, the tensile strength slightly increased and elongation reduced.

    SPECIFIED MINIMUM MECHANICAL PROPERTIES OF STRIP

    YIELD STRESS 250 MPa (min.)

    TENSILE STRESS 320 MPa (min.)

    ELONGATION 25 % (min.)

    NORMAL RANGE OF MECHANICAL PROPERTIES OF STRIP

    YIELD STRESS 255 to 325 MPa

    TENSILE STRESS 345 to 395 MPa

    ELONGATION 27 to 40 %

    SPECIFIED CHEMICAL COMPOSITION - (LADLE ANALYSIS)

    CARBON C 0.07 % max.


    MANGANESE Mn 0.25 % max.
    PHOSPHORUS P 0.03 % max.
    SULPHUR S 0.03 % max.

    ZINC COATING WEIGHT


    2
    COATING WEIGHT (ZM275) 275 g/m both side
    Calculated Coating Thickness (ZM275) 38.5 mm
    Minimised Spangle
    Based on Standard AS1397 - 2001

    Note: If this document is not located on the network drives in PDF format it is not a controlled document

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