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Q/BQB 440-2014 English PDF (QBQB440-2014)

Q/BQB 440-2014 English PDF (QBQB440-2014)

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Q/BQB 440-2014: Prepainted steel sheets and strips

This Technical Conditions specifies the terms and definitions, classifications and codes, size, appearance, weight, technical requirements, inspection and testing, packaging, marking and inspection documents of prepainted steel sheet and strips.
Q/BQB 440-2014
Q/BQB
SUPPLY TECHNICAL CONDITIONS
OF BAOSHAN IRON and STEEL CO., LTD.
Replacing Q/BQB 404-2009
Prepainted steel sheets and strips
Issued on. October 18, 2014 Implemented before. March 31, 2015
Issued by. Baoshan Iron and Steel Co., Ltd.
Table of Contents
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Classifications and codes ... 6
5 Order required information ... 7
6 Size, appearance, weight and tolerance ... 8
7 Technical requirements ... 8
8 Inspection and test ... 13
9 Packaging, marks and inspection documents ... 15
10 Transport, storage, processing ... 15
11 Numerical correction rule ... 15
12 Description of the corrosion of the environment of use ... 16
13 Selections of prepainted steel sheet ... 16
14 Prepainted steel sheet?€?s storage, transport and loading-unloading ... 16 15 Prepainted steel sheet?€?s processing ... 16
16 Life to the first major maintenance and durability of prepainted steel sheet ... 16
17 Air exposure test field of prepainted steel sheet ... 16
Annex A (Informative) Description of the corrosion of the environmental of use ... 17
Annex B (Informative) Selection of prepainted steel sheet ... 21
Annex C (Informative) Storage, transport and loading-unloading of prepainted steel sheet ... 25
Annex D (Informative) Processing of prepainted steel sheet ... 27
Annex E (Informative) Life to the first major maintenance and durability of prepainted steel sheet ... 29
Annex F (Informative) Air exposure test field of prepainted steel sheet ... 30 Prepainted steel sheets and strips
1 Scope
This Technical Conditions specifies the terms and definitions, classifications and codes, size, appearance, weight, technical requirements, inspection and testing, packaging, marking and inspection documents of prepainted steel sheet and strips (hereinafter referred to as prepainted steel sheet).
This Technical Conditions is applicable to the building prepainted steel sheets that are manufactured by Baoshan Iron and Steel Co., Ltd., of thickness of 0.22 mm ~ 2.0 mm. The industries of home appliance, furniture, steel window can refer to use.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1766-2008, Paints and Varnishes-Rating Schemes of Degradation of
Coats
GB/T 8170-2008, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 13448-2006, Test methods for prepainted steel sheet
GB/T 15957-1995, Corrosivity classification of atmospheric environment
GB/T 19292.1-2003, Corrosion of metals and alloys - Corrosivity of
atmospheres - Classification
Q/BQB 400, Packaging, marks and inspection documents of cold-rolled
products
Q/BQB 420, Hot-dip galvanized / zinc-iron alloy coated steel sheet and
strip
Q/BQB 425, Hot-dip galvanized alloy steel sheet and strip
Q/BQB 430, Galvanized steel sheet and strip
3 Terms and definitions
3.1 prepainted steel sheet
the product of which the organic coating (the top side is at least two layers) is continuously coated on the surface-pretreated substrate and then is baked and cured
3.2 steel substrate
the steel strip used for coating painting
3.3 top side
usually referring to the higher demanding side on color, coating performance, surface quality in the two sides of prepainted steel sheet; when delivered in roll, it usually refers to the outside of the prepainted steel coil
3.4 bottom side
the opposite side to the top side of prepainted steel sheet
3.5 building exterior applications
the applications mainly affected by building external atmosphere
3.6 building interior applications
the applications mainly affected by building internal atmosphere
3.7 hardness
the ability of coating to resist to scratch, friction, collision, press and other mechanical effects
3.8 flexibility
the ability of the coating to co-deform with the substrate without damage 3.9 adhesion
the firmness between coatings or between coating and substrate
3.10 life to the first major maintenance
the interval FROM the end of production TO the time when the performance of original coating degrades then major maintenance must be carried out so as to continue protecting the substrate
comply with the provisions of Table 4. Special requirements for pencil
hardness shall be negotiated at the time of order.
7.2.3 Coating gloss
7.2.3.1 The coating gloss is represented by 60?? mirror gloss. The gloss is divided into low, medium and high grades. The nominal value of gloss at all grades shall be in accordance with the provisions of Table 4.
7.2.3.2 The gloss of three samples shall comply with corresponding
provisions of Table 4. For low gloss coating, the gloss tolerance is ?? 3 gloss units. For medium gloss coating, the gloss tolerance is ?? 10 gloss units. For high gloss coating, the gloss tolerance is 0 ~ -10 gloss units.
7.2.3.3 The difference in gloss per batch of product shall not exceed 10 gloss units.
7.2.4 Coating flexibility / adhesion
7.2.4.1 The coating flexibility / adhesion is usually evaluated by bending test and reverse impact test. If the cross-grid test, cup sudden test, etc. are required for further evaluation, it shall be negotiated at the time of order. 7.2.4.2 Bending test
7.2.4.2.1 Three sample values of bending test shall comply with the
corresponding provisions of Table 4. Special requirements for bending test shall be negotiated at the time of order.
7.2.4.2.2 After the bending sample is stripped off by tape, there shall be no coating peeling off at the bend, excluding the coating falling off within 10 mm from the sample edges. If non-visible cracks are required at the bend, it shall be negotiated at the time of order.
7.2.4.2.3 The prepainted steel sheets are usually supplied in A-level T-bend. B-level T-bend performance shall be negotiated at the time of order. Steel windows are usually supplied in accordance with the B-level T-bend. For prepainted steel sheets of which the designations are TS550GD+Z and
TS550GD+AZ, T-bend performance is not required. If there are special
requirements for T-bend performance, it shall be negotiated at the time of order.
7.2.4.3 Reverse impact test
7.2.4.3.1 The minimum value of reverse impact test?€?s three samples shall comply with the provisions of Table 4. Special requirements for impact energy shall be negotiated at the time of order.
7.2.4.3.2 After the reverse impact test sample is peeled off by tape, there shall be no coating peeling off in the deformation area. If non-visible cracks are required at the deformation area, it shall be negotiated at the time of order.
7.2.4.3.3 For prepainted steel sheets of which the thickness is less than 0.40 mm and designations are TS550GD+Z, TS550GD+AZ, the reverse
impact test is not required.
7.2.5 Coating durability
7.2.5.1 The coating durability is usually evaluated by the resistance to neutral salt spray test or the ultraviolet lamp accelerated weathering test. If the xenon lamp accelerated weathering test, heat resistance and resistance to sulfur dioxide hot and humid test are required for further evaluation, it shall be negotiated at the time of order.
7.2.5.2 Resistance to neutral salt spray test
7.2.5.2.1 The time of the resistance to neutral salt spray test of coating shall comply with the provisions of Table 4. Special requirements for test time shall be negotiated at the time of order.
7.2.5.2.2 Within the specified time of neutral salt spray test, the bubble density level and bubble size rating of unmarked sample shall not exceed grade 3 specified in Table 21 of GB/T 1766.
7.2.5.3 Ultraviolet lamp accelerated weathering test
7.2.5.3.1 The time of ultraviolet lamp accelerated weathering test of coating shall comply with the provisions of Table 4. Special requirements for test time shall be negotiated at the time of order.
7.2.5.3.2 Within the test time specified in Table 4, the sample should be free of foam, cracks. Powdery shall not exceed grade 1 specified in GB/T 1766. 7.2.5.3.3 When the coating is polyester and silicon-modified polyester, it is usually evaluated with UVA-340. If UVB-313 is used for evaluation, it shall be indicated at t...

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