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Q/BQB 420-2021 English PDF (QBQB420-2021)

Q/BQB 420-2021 English PDF (QBQB420-2021)

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Q/BQB 420-2021: Hot-dip galvanizing/zinc-iron alloy/zinc-magnesium alloy coated steel sheet and strip

BaoSteel: Hot-Dip Galvanizing/Zinc-Iron Alloy/Zinc-Magnesium Alloy Coated Steel Sheet and Strip
Q/BQB 420-2021
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 420-2019
Hot-Dip Galvanizing/Zinc-Iron Alloy/Zinc-Magnesium
Alloy Coated Steel Sheet and Strip
ISSUED ON: JUNE 04, 2021
IMPLEMENTED ON: AUGUST 10, 2021
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
1 Chemical composition ... 3
2 Mechanical properties ... 6
3 Requirements for coating mass ... 11
4 Requirements for test and inspection ... 12
1 Chemical composition
Table C.1
Table C.2
Table C.3
Designation
Chemical composition (melting analysis) % (mass fraction) no more than
a Nb is allowed to replace Ti; the total content of Nb and Ti is no more than 0.30% at this time. Designation Chemical composition (melting analysis) % (mass fraction) no more than a Ti and Nb can be added individually or in combination. V and B can also be added; and the total content of theses alloy elements is ??? 0.22%. Designation
Chemical composition (melting analysis) % (mass fraction)
No more
than
Si
No more
than
Mn
No more
than
No more
than
No more
than
Alt
No less
than
Ti a
No more
than
Nb a
No more
than

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