Q/BQB 425-2019 English PDF

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Q/BQB 425-2019: Hot-dip aluminum-zinc alloy coated steel plate and steel strip
Q/BQB 425-2019
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 425-2018
Continuously-Hot-Rolled Steel Sheets and Strips for
Building Structures
Table of Contents
1 Chemical Compositions ... 3
2 Mechanical Properties ... 3
3 Coating Weight ... 4
4 Inspection and Test ... 4
Continuously-Hot-Rolled Steel Sheets and Strips for
Building Structures
1 Chemical Compositions
Table 5
2 Mechanical Properties
Table 6
Designation Chemical compositions (smelting analysis) % (mass fraction) no more than
Designation
Tensile test
Yield strength Tensile strength Elongation after break %
No less than
a When the yield phenomenon is not obvious, adopt Rp0.2; otherwise, adopt ReL.
b If the specimen is Specimen P6 in GB/T 228.1, the specimen direction is transverse.
c If the product nominal thickness is greater than 0.50mm, but no greater than 0.70mm, the elongation after break is allowed to decrease 2 units;
if the product nominal thickness is no greater than 0.50mm, the elongation after beak is allowed to decrease 4 units.