Q/BQB 420-2019 English PDF (QBQB420-2019)

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Q/BQB 420-2019: Hot-dip galvanizing/zinc-iron alloy/zinc-magnesium alloy coated steel sheet and strip
Q/BQB 420-2019
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 420-2018
Continuously-Hot-Rolled Steel
Sheets and Strips for Building Structures
Table of Contents
1 Chemical Compositions ... 3
2 Mechanical Properties ... 6
3 Coating Weight ... 10
4 Inspection and Test ... 10
Table 21
Test item Sample quantity/piece Sampling method Test method
Chemical analysis a 1/furnace GB/T 20066
GB/T 223, GB/T 4336, GB/T
20123, GB/T 20125 and GB/T
20126
Tensile test 1/batch
GB/T 2975
Method B in GB/T 228.1
Plastic strain ratio
(Value-r) 1 or 3/batch GB/T 5027
Strain hardening
index (Value-n) 1/batch GB/T 5028
Value-BH2 1/batch GB/T 24174
Coating weight 3/group or batch Figure 1 GB/T 1839
Bending test of
coating --- Any position
GB/T 232, specimen width of
100mm
Surface roughness --- ¼ width of steel sheet GB/T 2523
Resistance to neutral
salt spray test ---
At least 50mm from the
edge GB/T 10125
b – width of steel sheet or strip, in mm
Figure 1 – Sampling Position of Coating Weight Specimen
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