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Q/BQB 420-2019 (QBQB 420-2019)

Chinese Standard: 'Q/BQB 420-2019'
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Q/BQB 420-2019English270 Add to Cart 0--10 minutes. Auto-delivered. Hot-dip galvanizing/zinc-iron alloy/zinc-magnesium alloy coated steel sheet and strip Q/BQB 420-2019 Valid Q/BQB 420-2019

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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
建筑结构用热连轧钢板及钢带
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
__________ END __________

Q/BQB 420-2019
Hot-dip galvanizing/zinc-iron alloy/zinc-magnesium alloy coated steel sheet and strip
Q/BQB 420-2019
1 Chemical composition
Table C.1
a Allow Nb to replace part of Ti. At this time, the total content of Nb and Ti should not be greater than 0.30%.
Table C.2
Table C.3
a Ti and Nb can be added individually or in combination. V and B can also be added. At this time, the total content of these alloy elements is ≤0.22%.
Table C.4
a Ti can be partially or completely replaced by Nb, in which case the total content of Nb and/or Ti is ≤0.20.
Table C.5
Alloy elements such as Ni, Cr, Mo can be added as required, and the total amount of these alloy elements is not more than 1.5%.
Table C.6
Alloy elements such as Ni, Cr, Mo can be added as required. At this time, the total amount of these alloy elements is not more than 1.5%.
Table C.7
a Alloy elements such as Ni, Cr, Mo can be added as required. At this time, the total amount of these alloy elements is not more than 1.5%.
Table C.8
a Ni, Cr, Mo and other alloy elements can be added as required. At this time, the total amount of these alloy elements is not more than 1.5%.
2 mechanical properties
table 5
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
b The specimen is P6 specimen specified in GB/T 228.1, and the specimen direction is transverse.
c When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elongation after breaking is allowed to decrease by 2%; when the nominal thickness of the product is not greater than 0.50mm,
The elongation after breaking is allowed to decrease by 4%.
d When the nominal thickness of the product is greater than 1.5mm, r90 is allowed to decrease by 0.2; when the nominal thickness of the product is greater than 2.5mm, the provisions of r90 are no longer applicable.
e When the nominal thickness of the product is 0.70mm or less, r90 is allowed to fall by 0.2; n90 is allowed to fall by 0.01.
Table 6
a Use RP0.2 when there is no obvious yield, otherwise use ReH.
b Except S550GD Z, S550GD ZM, the tensile strength of other brands can require a range of 140MPa.
c The sample is a P6 sample specified in GB/T 228.1, and the sample direction is longitudinal.
When the nominal thickness of the product is greater than 0.50mm, but not greater than 0.70mm, the elongation after breaking is allowed to decrease by 2%; when the nominal thickness of the product is not greater than 0.50mm,
The elongation after breaking is allowed to decrease by 4%.
For the products of S550GD Z and S550GD ZM, when the thickness of the product is not more than 0.70mm, the elongation is too low due to the effect of thickness reduction.
Yield strength cannot be measured. At this time, the yield strength is replaced by the tensile strength.
Table 7
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
b The specimen is P6 specimen specified in GB/T 228.1, and the specimen direction is transverse.
c When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elongation after breaking is allowed to decrease by 2%; when the nominal thickness of the product is not greater than 0.50mm,
The elongation after breaking is allowed to decrease by 4%.
d When the nominal thickness of the product is greater than 1.5mm, r90 is allowed to decrease by 0.2. When the nominal thickness of the product is greater than 2.5mm, the provisions of r90 no longer apply.
Table 8
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
The b sample is a No. 5 sample specified in JIS Z 2241, and the sample direction is transverse.
c rm = (r90 2r45 r0) ∕ 4.
d When the nominal thickness of the product is greater than 1.5mm, rm is allowed to decrease by 0.2. When the nominal thickness of the product is greater than 2.5mm, the rm rule no longer applies.
Table 9
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
b The specimen is P6 specimen specified in GB/T 228.1, and the specimen direction is transverse.
c When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elongation after breaking is allowed to decrease by 2%; when the nominal thickness of the product is not greater than 0.50mm,
The elongation after breaking is allowed to decrease by 4%.
d When the nominal thickness of the product is greater than 1.5mm, rm is allowed to decrease by 0.2. When the nominal thickness of the product is greater than 2.5mm, the provisions of r90 no longer apply.
Table 10
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
b The sample is a P6 sample specified in GB/T 228.1, and the sample direction is transverse.
c When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elongation after breaking is allowed to decrease by 2%; when the nominal thickness of the product is not greater than 0.50mm, the breaking
The post-elongation is allowed to decrease by 4%.
Table 11
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
b When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elongation after breaking is allowed to decrease by 2%; when the nominal thickness of the product is not greater than 0.50mm,
The elongation after breaking is allowed to decrease by 4%.
c Normally, the direction of the sample is longitudinal, and the sample is No. 5 specified in JIS Z 2241. If the user has special requirements, it can be determined through negotiation.
d Normally, the sample direction is horizontal, and the sample is No. 5 sample specified in JIS Z 2241.
Table 12
a Use RP0.2 when there is no obvious yield, otherwise use ReL.
b Normally, the direction of the sample is longitudinal, and the sample is No. 5 specified in JIS Z 2241. If the user has special requirements, it can be determined through negotiation.
c When the nominal thickness of the product is greater than 0.50mm, but less than or equal to 0.70mm, the elon......
Related standard: Q/BQB 427-2020    Q/BQB 410-2019