Q/BQB 430-2023 PDF English
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Electrolytically zinc coated steel sheet and strip
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Q/BQB 430-2023: PDF in English (QBQB 430-2023) Q/BQB 430-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 430-2021
Electrolytically Zinc Coated Steel Sheet and Strip
ISSUED ON: APRIL 09, 2023
IMPLEMENTED ON: JULY 01, 2023
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Classification and Code ... 6
5 Information Required for Ordering ... 7
6 Dimensions, Appearance, Weight and Allowable Deviations ... 8
7 Technical Requirements ... 8
8 Inspection and Test ... 14
9 Packaging, Marking and Inspection Documents ... 15
10 Numerical Rounding-off Rules ... 15
Appendix A (Normative) Weight Calculation Method in Theoretical Weighing ... 16
Appendix B (Normative) Method for Assessing the Severity of Surface Corrosion of
Fingerprint-Resistant Films ... 17
Electrolytically Zinc Coated Steel Sheet and Strip
1 Scope
This Document stipulates the terms and definitions, classification and codes, dimensions,
appearance, technical requirements, inspection and test, packaging, marking and inspection
documents of electrolytically zinc coated steel sheet and strip.
This Document applies to electrolytically zinc coated steel sheet and strip produced by Baoshan
Iron and Steel Co., Ltd., hereinafter referred to as steel sheet and strip.
NOTE: Since the coating weight of electrolytically zinc coated steel sheet and strip is relatively small,
they are not suitable for outdoor exposure without surface chemical treatment and painting.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 1839 Steel product zinc coating mass testing method
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
YB/T 4829 Determination of metallic coating mass on steel - On-line X-ray fluorescence
method
Q/BQB 400 Packaging, marking and inspection documents for cold rolled products
Q/BQB 401 Cold rolled steel sheets and strip – Dimensions, shape, weight and tolerances
Q/BQB 408 Cold formed low carbon steel sheet and strip for cold forming
Q/BQB 410 Cold-rolled carbon structural steel and steel strip
Q/BQB 418 Cold-rolled advanced high-strength steel plate and strip
Q/BQB 419 Cold-rolled ordinary high-strength steel plate and strip
3 Terms and Definitions
3.1 Electrolytically zinc coated layer (Z)
A dense coating obtained by reducing zinc ions dissolved in the electrolyte through the action
of electric current. More than 99% of the coating is composed of zinc and contains no trace
elements harmful to the bonding strength of the adhesive or the paint performance.
3.2 Chrome-free and fingerprint-resistant (N5)
An organic/inorganic composite coating that does not contain harmful elements such as
chromium (Cr) and has good fingerprint resistance, corrosion resistance and paintability.
3.3 High conductivity, high corrosion resistance, chromium-free and fingerprint-resistant
(NE)
Chrome-free, fingerprint-resistant coating with excellent electrical conductivity and high
corrosion resistance.
3.4 Excellent conductive type, chromium-free and fingerprint-resistant (NE1)
Chrome-free, fingerprint-resistant coating with excellent conductivity and good corrosion
resistance.
3.5 High-temperature- drying-resistant, chromium-free and fingerprint-resistant (N8)
A chromium-free fingerprint-resistant coating with high corrosion resistance, good
processability, electrical conductivity and good high-temperature-resistant, drying, coating
resistance.
3.6 High-corrosion-resistant, chromium-free and fingerprint-resistant (NC)
Chrome-free, fingerprint-resistant coating with excellent corrosion resistance.
3.7 High heat dissipation type, chromium-free and fingerprint-resistant (NR)
Chrome-free, fingerprint-resistant coating with high radiation heat dissipation.
3.8 Special chromium-free passivation (CSG) for fuel tanks
Chrome-free coating with excellent resistance to gasoline corrosion.
3.9 Inorganic self-lubricating (SW)
An inorganic chromium-free coating with suitable lubricity and resistance to stamping
blackening.
h) Surface quality;
i) weight;
j) Packaging method;
k) Others.
5.2 If the dimensional and unevenness accuracy, surface quality level, surface treatment type
and packaging method are not specified in the order contract, normal dimensional accuracy,
ordinary unevenness accuracy, surface quality level of FB, and the surface treatment of
chromium-free passivation treatment (C5) shall prevail; the product shall be delivered
according to the packaging method specified by the supplier.
6 Dimensions, Appearance, Weight and Allowable Deviations
6.1 The nominal thickness of steel sheets and strips is the sum of the thickness of the substrate
and the thickness of the coating.
6.2 The dimension, appearance and allowable deviation of steel sheets and strips shall comply
with the provisions of Q/BQB 401.
6.3 Steel sheets are usually delivered according to theoretical weight, but may also be delivered
according to actual weight. See Appendix A for the calculation method of theoretical weight.
Steel strips are usually delivered by actual weight.
7 Technical Requirements
7.1 Chemical composition
The chemical composition of steel sheets and strips shall comply with the provisions of the
substrate documents listed in this Document.
7.2 Mechanical and process properties
7.2.1 The mechanical and process properties of steel sheets and strips shall comply with the
relevant provisions of the corresponding substrate documents Q/BQB 408, Q/BQB 410,
Q/BQB 418, Q/BQB 419 or other cited substrate technical specifications. Tensile specimens
are coated specimens.
7.2.2 When steel sheets and strips are supplied as specified parts, the supplier and the purchaser
can agree on a mechanical property range that meets the processing requirements of the parts
as the acceptance benchmark. At this time, the mechanical property specified in the
corresponding substrate document shall no longer be used as the basis for delivery.
FD The better side of the two sides of the product must further limit the defects, that is, it cannot affect the appearance quality after painting, and the other side must at least meet the requirements of FB.
7.5.2 For steel strips, since there is no opportunity to cut off the defective part of the strip, the
steel strip is allowed to be delivered with defects, but the defective part shall not exceed 3% of
the total length of each coil.
7.6 Surface treatment
7.6.1 Steel sheets and strips are usually delivered by chemically passivated and/or oiled surface
treatment forms. Under normal packaging, transportation, loading and unloading and storage
conditions, the supplier shall ensure that no white rust shall occur on the surface of steel sheets
and strips within 6 months from the date of completion of manufacturing.
NOTE: The issuance date in the product inspection document is usually specified as the manufacturing
completion date of the product.
7.6.2 During the transportation or storage of steel sheets and strips, all surface treatment forms
can only provide temporary protection for the product surface, and the color of the product
surface may change.
7.6.3 For steel sheets and strips with oil-coated surfaces, the surface protection effect mainly
depends on the storage duration. As the storage duration of the product increases, the
distribution of the oil film of the surface anti-rust oil shall become more and more uneven,
which may produce exposed spots in local areas, which may further produce white rust and
friction marks. Different anti-rust oil products shall exhibit completely different properties.
7.6.4 Users shall choose appropriate surface treatment methods based on their own product uses,
processing techniques, painting methods, painting equipment and other specific conditions, and
try to shorten the storage duration of steel sheets and strips.
7.6.5 Choosing a suitable surface treatment form can reduce the tendency of white rust and
friction marks during transportation and storage, and at the same time improve the adhesion of
the paint layer during subsequent processing and protect the coating.
7.6.6 If phosphating and painting are required for subsequent processing, passivation treatment
is not recommended.
7.6.7 For surface treatment methods involving oiling, the purchaser shall ensure that the
cleaning agent used in its degreasing equipment shall not damage the coating quality.
7.6.8 If the user specifies the untreated surface (U), it shall be clearly stated in the contract. The
supplier shall not bear corresponding product quality responsibility for surface defects such as
white rust, scratches, and friction marks that occur during handling, storage, and use of this
type of product.
7.6.9 The available surface treatments are as follows:
7.6.9.1 Chromium-free passivation (C5)
This surface treatment can reduce white rust on the surface of the product during transportation
and storage, and can also improve the corrosion resistance of the end product. Chromium-free
passivation film limits hexavalent chromium substances that are harmful to human health. It
mainly suitable for general home appliance industry.
7.6.9.2 Chromium-free passivation + oiling (CO5)
The surface treatment is double-sided chromium-free passivation + oiling, which can further
reduce white rust on the product surface. Chromium-free passivation film limits hexavalent
chromium substances that are harmful to human health. It mainly suitable for general home
appliance industry.
7.6.9.3 Single-sided chromium-free passivation + oiling (SCO5)
The surface treatment is single-sided chromium-free passivation + oiling. The chromium-free
passivation surface can further reduce the generation of white rust on the product surface and
has good corrosion resistance. Chromium-free passivation film limits hexavalent chromium
substances that are harmful to human health. It mainly suitable for the fuel tank industry.
7.6.9.4 Phosphating (P)
This surface treatment has excellent painting properties and good processing properties. It is
mainly suitable for industries that require spraying such as home appliances, furniture, doors,
elevators and construction, etc.
7.6.9.5 Phosphating + oiling (PO)
This surface treatment can reduce white rust on the product surface and improve the formability
of the steel sheet. It can have excellent coating performance after removing the anti-rust oil. It
mainly suitable for the automotive industry.
7.6.9.6 Phosphating (including chromium-free sealing) (PC5)
The surface has excellent coating performance and good processability, while reducing white
rust on the product surface. It is mainly suitable for industries that require spraying such as
home appliances, furniture, doors, elevators and construction, etc.
7.6.9.7 Phosphating (including chromium-free sealing) + oiling (PCO5)
This surface treatment has higher corrosion resistance than PO, improves the formability of the
steel sheets, and has excellent coating properties after removing the anti-rust oil. It is mainly
suitable for industries that require spraying such as home appliances, furniture, doors, elevators
and construction.
7.6.9.8 Chromium-free and fingerprint-resistant (N5)
The surface treatment is a double-sided chromium-free fingerprint-resistant coating, which has
high corrosion resistance, good processability, paintability and electrical conductivity. It mainly
suitable for film-television, and 3C industries, it can be used naked or sprayed.
7.6.9.9 High conductivity, high corrosion resistance, chromium-free and fingerprint
resistant (NE)
The surface treatment is a double-sided chromium-free fingerprint-resistant coating, which has
excellent conductivity, high corrosion resistance, good processability and paintability. It mainly
suitable for 0A and audio-visual industries, it can be used naked or sprayed.
7.6.9.10 Excellent conductive type, chromium-free and fingerprint-resistant (NE1)
The surface treatment is a double-sided chromium-free fingerprint-resistant coating with
excellent conductivity, good corrosion resistance and processability. It mainly suitable for bare
parts in 0A and audio-visual industries; not recommended for powder coating treatment. This
product usually uses a thin layer of zinc plating.
7.6.9.11 High temperature-and-drying-resistant, chromium-free and fingerprint-resistant
(N8)
The surface treatment is a double-sided chromium-free fingerprint-resistant coating, which has
high corrosion resistance, good processability, electrical conductivity, and good high-
temperature-drying-resistant painting. The processed parts adopt a high-temperature drying
processing after cleanings, the surface of the steel sheet still has good painting performance. It
mainly suitable for film-television and 3C industries, it can be used naked or sprayed.
7.6.9.12 Corrosion-resistant, chromium-free and fingerprint-resistant (NC)
The surface treatment is a double-sided chromium-free fingerprint-resistant coating with
excellent corrosion resistance, good processability and paintability. It mainly suitable for
industries that have special requirements for corrosion resistance.
7.6.9.13 High heat dissipation type, chrome-free and fingerprint resistant (NR)
One side of the surface treatment is a black fingerprint-resistant coating with excellent radiation
and heat dissipation performance; and the other side is a chromium-free and fingerprint-
resistant treatment. It mainly suitable for the back shell of all-in-one machines in the film and
television industry.
7.6.9.14 Chromium-free passivation (CSG) for fuel tanks
This surface treatment is a special passivation treatment on the single-sided electrolytically zinc
coated surface. The passivation layer has excellent resistance to gasoline deterioration liquid
and good salt spray resistance. It is particularly suitable for use as a fuel tank shell.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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