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Q/BQB 440-2018

Chinese Standard: 'Q/BQB 440-2018'
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BASIC DATA
Standard ID Q/BQB 440-2018 (Q/BQB440-2018)
Description (Translated English) (Color coated steel sheet and strip)
Sector / Industry Chinese Industry Standard
Classification of Chinese Standard QBQ
Word Count Estimation 5,513
Administrative Organization Baoshan Iron and Steel Co., Ltd.

Q/BQB 440-2018
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Steel sheet and steel strip with colored coating
彩色涂层钢板及钢带
Issued on. February 02, 2018
Issued by. Baoshan Iron and Steel Co., Ltd.
Table of Contents
Self-commitment ... 3
Technical indicator 1 ... 4
1 Chemical composition ... 5
2 Coating performance ... 5
3 Inspection and testing ... 7
Self-commitment
The contents of the Q/BQB 440-2018 “Steel sheet and steel strip with colored
coating” which are prepared and published by our company are in compliance
with the requirements of relevant national laws and regulations, mandatory
standards and relevant industrial policies, meanwhile it is approved by the
corporate’s legal representative in accordance with the prescribed procedures.
The products which are produced by our company meet the technical
requirements as specified in this standard, the standard number is clearly
indicated on the corresponding product packaging. Our company is responsible
for the truthfulness, accuracy and legality of the public information, assumes full
legal responsibility for the consequences of the implementation of this standard.
Baoshan Iron and Steel Co., Ltd.
2018-02-02

Q/BQB 440-2018
(Color coated steel sheet and strip)
Baoshan Iron and Steel Co., Ltd. Enterprise Standard
Color coated steel sheet and strip
Published on.2018-02-02
Baoshan Iron and Steel Co., Ltd. released
Self-commitment
Requirements for regulations, mandatory standards and related industrial policies, and approved by the legal representative of the enterprise in accordance with the prescribed procedures
The products produced by our company meet the technical requirements stipulated in this standard, and the standard number is clearly indicated on the corresponding product packaging. My company
Responsible for the truthfulness, accuracy and legality of the public information of the statement, and assume full legal responsibility for the consequences of the implementation of this standard.
Baoshan Iron and Steel Co., Ltd.
2018-02-02
Technical indicator 1
Index name. chemical composition, mechanical properties, coating properties
Indicator requirements. Chemical composition, mechanical properties, coating properties and test methods are attached
(See page 4 for details)
1 Chemical composition, mechanical properties
Unless otherwise specified, the mechanical properties and coating properties of the coated substrate shall be in accordance with the corresponding standard substrate Q/BQB .
420, Q/BQB 425, Q/BQB 430 regulations. Other suitable substrate standards may also be adopted upon agreement between the supplier and the purchaser.
2 coating properties
Table 4
Topcoat type Coating thickness (μm) Pencil hardness
Polyester a (PE) ≥20 ≥F
Silicon modified polyester (SMP) ≥20 ≥F
High durability polyester (HDP) ≥22 ≥HB
Polyvinylidene fluoride b (PVDF) ≥23 ≥HB
a User can specify the pencil hardness as HB if required.
b When the thickness of the coating is ≥ 30 μm, the pencil hardness is required to be B.
table 5
Level 60° specular gloss range
Matte (matt) ≤10
Low gloss (low gloss) >10 ≤25
Satin >25 ≤45
Semi-gloss >45 ≤60
Gloss >60 <80
High gloss (high gloss) ≥80
Table 6
Topcoat
kind
180° bending a
Reverse shock
(J)
Thickness ≤0.75mm
(Steel window material thickness ≤ 0.80mm)
Class A B
Polyester (PE) ≤ 4T ≤ 3T ≥ 9
Silicon modified polyester (SMP) ≤ 4T ≤ 3T ≥ 9
High durability polyester (HDP) ≤ 4T ≤ 3T ≥ 9
Polyvinylidene fluoride (PVDF) ≤4T ≤2T ≥9
A steel plate and steel strip with a thickness > 0.75 mm (or steel window thickness > 0.80 mm) are bent at 90°; the direction of the sample is longitudinal.
Table 7
Topcoat type resistant to neutral salt spray
a UV lamp accelerates aging b
Test time (h) color loss c loss of light c test time (h) UVA-340 UVB-313
Polyester (PE) ≥1000 ≥600 ≥400 ≤4 grade -
Silicon modified polyester (SMP) ≥1000 ≥720 ≥480 ≤4 grade -
High durability polyester (HDP) ≥1500 ≥960 ≥600 ≤3 ≤3
Polyvinylidene fluoride (PVDF) ≥2000 ≥1800 ≥1000 ≤2 ≤2
b The sample is a flat sample and subjected to edge sealing treatment.
bUVA-340 adopts 12 hours for 1 cycle. 8h ultraviolet light, blackboard temperature 60°C±3°C, 4h condensation, blackboard temperature 50°C±3°C. UVB-313 adoption
8 hours is 1 cycle. 4h UV light, blackboard temperature 60 °C ± 3 °C, 4h condensation, blackboard temperature 50 °C ± 3 °C.
The loss of light and color loss of the c-functional coating allows for a relaxation of one grade.
3 Inspection and testing
Test item number of samples (unit) test method sample position
Coating thickness 3/batch GB/T 13448 Take one sample at 1/2 of the width of the plate and take one sample at 50 mm from both sides.
Pencil hardness 1/batch GB/T 13448 at least 50mm from the edge
Indicator requirements document for Technical Indicator 1
60° coated mirror gloss 1/batch GB/T 13448 at least 50mm......
Related standard: Q/BQB 430-2018    Q/BQB 431-2018
Related PDF sample: Q/BQB 430-2018    Q/BQB 431-2018