GB/T 12755-2008 PDF in English
GB/T 12755-2008 (GB/T12755-2008, GBT 12755-2008, GBT12755-2008)
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| GB/T 12755-2008 | English | 125 |
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Profiled steel sheet for building
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| GB/T 12755-1991 | English | 639 |
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Roll-profiled steel sheet for building
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Standards related to (historical): GB/T 12755-2008
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GB/T 12755-2008: PDF in English (GBT 12755-2008) GB/T 12755-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 12755-1991
Profiled Steel Sheet for Building
ISSUED ON: DECEMBER 6, 2008
IMPLEMENTED ON: OCTOBER 1, 2009
Issued by General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China
Standardization Administration of the People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Ordering Content ... 5
4 Terms and Definitions ... 6
5 Classification and Model ... 7
6 Shape and Structure of Steel Sheet ... 8
7 Quality Inspection and Permissible Variation ... 10
8 Technical requirements ... 11
9 Packaging, Marking, Transportation, Storage and Quality Certificate ... 13
Appendix A (Normative) Chemical Composition and Mechanical Properties of
Hot Galvanizing and Hot-dipped Aluminium-zinc Steel Substrate (According to
GB/T 2518, GB/T 14978) ... 15
Appendix B (Normative) Thickness Tolerance of the Hot Galvanizing and Hot-
dipped Aluminium-zinc Steel Substrate (According to GB/T 2518, GB/T 14978)
... 16
Appendix C (Normative) Coating Weight and Coating Durability Test for Colored
Hot-dipped Substrate (According to GB/T 12754) ... 17
Appendix D (Normative) Corrosiveness Classification of the External
Conditions impact on the Cold Bending Thin Sections Structure (According to
GB 50018) ... 19
Appendix E (Informative) Grade, Function, Classification and Code of
Prepainted Steel Sheet (According to GB/T 12754) ... 20
Appendix F (Informative) Grade for the Operating Environment Corrosiveness
of the Colored Pre-painted Steel Sheet (According to GB/T 12754) ... 22
Profiled Steel Sheet for Building
1 Scope
This Standard specifies the classification, code, plate profile and structure requirements, cross-
section shape and size, technical requirements, quality inspection and tolerance, packaging,
marking and quality certificate of various profiled steel sheet for building.
This Standard is applicable to roll-forming profiled steel sheet for building on the continuous-
mode unit, including various shaping plate used for all parts of roof, wall face and floor cover.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute
provisions of this Standard. For dated reference, subsequent amendments (excluding content of
corrigenda) to, or revisions of, any of these publications do not apply. However, Parties to
agreements based on this Code are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. For undated references, the latest edition
of the normative document referred to applies.
GB/T 708 Dimension Shape Weight and Tolerance for Cold-rolled Steel Plates and Sheets
GB/T 709 Dimension, Shape, Weight and Tolerances for Hot-rolled Steel Plates and
Sheets
GB/T 1766－1995 Paint and Varnish-Rating Schemes of Degradation of Coats
GB/T 1839 Test Method for Gravimetric Determination of Mass per Unit Area of
Galvanized Coatings Steel Products (GB/T 1839－2003, ISO 1460; 1992, MOD)
GB/T 2518 Continuously Hot-dip Zinc-coated Steel Sheet and Strip
CB/T 12754 Prepainted Steel Sheet
CB/T 13448 Test Method for Prepainted Steel Sheet
GB/T 14978 Continuously Hot-dip Aluminum-Zinc Alloy Coated Steel Sheet and Strip
GB 50018 Technical Code of Cold-formed Thin-wall Steel Structures
GB 50205 Code for Acceptance of Construction Quality of Steel Structures
3 Ordering Content
Contract or order ordering in accordance with this Standard shall include the following contents:
a) The standard number;
b) Product name and classification;
c) Plating plate grades, hot-dip coating variety (zinc, aluminum, zinc, zinc-aluminum, and
zinc-iron), coating weight, and plate thickness, material and performance requirements;
d) Color-coating structure, coating thickness and coating surface condition;
e) Finish coat variety and color;
f) Manner of packing;
g) Specification (product model, thickness and length);
h) Quantity;
i) Other additional requirements.
4 Terms and Definitions
The following terms and definitions are applicable to this Standard.
4.1 Profiled steel sheet
The stamped plate formed by rolling and cold bending the coated sheet or plating plate along
the plate width direction, and so as to form waveform section.
4.2 Profiled steel sheet for building
Independently used profiled steel sheet for building fender structure (roof and wall face) and
composite floor cover.
4.3 Base steel sheet
Various sheet steel or steel strips for making plating plate.
4.4 Steel substrate (plating plate)
Sheet steel or steel strip with surface coating, including hot-galvanized plate, hot-dip galvanized
aluminum zinc alloy plate, hot-galvanized aluminum alloy plate.
4.5 Prepainted steel sheet
The steel plate products continuously covered on organic coatings (at least two layers on the
top side) on the surface processed steel substrate (plating plate), and then, baking, solidifying
so as to form coating (colored prepainted sheet).
4.6 Top side
The upper surface of the plating plate and prepainted steel sheet or the external surface of the
profiled steel sheet.
4.7 Bottom side
The lower surface of the plating plate and prepainted steel sheet or the internal surface of the
8.1.2 The developed width of the profiled steel sheet (steel substrate’s width) should comply
with the requirements of the basic size of 600mm, 1000mm or 1200mm series. Commonly-
used width is preferably 1000mm.
8.2 Steel substrate and prepainted steel sheet
8.2.1 The steel substrate and prepainted steel sheet may all directly be shaped by rolling to
form profiled steel sheet. The chemical compositions and mechanical properties of the hot-
galvanizing steel substrate and hot-dipped aluminium-zinc steel substrate shall comply with the
requirements of Appendix A.
8.2.2 According to the yield strength grades, the substrate steels should adopt grade 250 (MPa)
and grade 350(MPa) steels. The parameters such as design value of strength may be valued
according to the requirements of GB 50018. When backed up by technical economy, higher-
strength steels can be adopted for steel substrate of the profiled steel sheet.
8.2.3 In engineering, the nominal thickness of the wall profiled steel sheet substrate should
not be less than 0.5mm, while that of the roofing profiled steel sheet substrate should not be
less than 0.6mm, and that of the floor system profiled steel sheet substrate should not be less
than 0.8mm. The steel substrate thickness (including coating thickness) tolerance shall comply
with the requirements of Appendix B, while the plates whose minus deviation exceed those
specified in Appendix B shall not be used for processing the profiled steel sheet.
8.2.4 Steel substrate coating (zinc, zinc-aluminium, and aluminium-zinc alloy coating) shall
adopt hot dipping method; the coating weight shall be ensured as the delivery item according
to the purchaser’s requirement and shall be indicated in the purchase contract. If no other
requirements asked by the purchaser, cladding weight (both sides) shall not be less than
90/90g/m2 (Hot dip galvanizing steel substrate), 50/50g/m2 (Aluminium-zinc alloy coating alloy
steel substrate) 65/65g/m2 (galvanized aluminium steel substrate). The recommended coating
weight for different corrosion media may refer to Appendix C, and the classification of
environmental corrosive conditions may refer to Appendix D.
8.3 Prepainted steel sheet
8.3.1 The coating type, performance, quality and other technical requirements and inspection
methods of the prepainted steel sheet for profiled steel sheet shall comply with the
requirements of GB/T 12754. The grades, function, classification and code of the colored pre-
painted steel sheet may see Appendix E, and the cladding, coating and durability test shall
comply with the requirements of Appendix C.
8.3.2 Coating type and coating structure of the prepainted steel sheet for the profiled steel
sheet shall be ensured as the delivery condition of the purchaser and shall be agreed and
indicated in the purchase contract. If no other requirements asked by the purchaser, coating
structure may be delivered according to the method of two layers on the top side and one layer
on the bottom side.
8.4 Others
8.4.1 The profiled steel sheet for building shall not adopt electro-galvanizing steel plate or
steel plate (strip) without any cladding and coating.
8.4.2 The profiled steel sheet for composite floor system shall adopt hot-galvanizing steel
plate.
8.4.3 When the lower plate of the composite roofing profiled steel sheet is perforated acoustic
board, the pore diameter and row pitch of the profiled steel sheet shall be specially designed.
8.4.4 The same roofing engineering or wall engineering’s profiled steel sheet should adopt
the prepainted steel sheet with the same batch number for the order and the delivery, so as to
avoid color difference.
9 Packaging, Marking, Transportation, Storage and
Quality Certificate
9.1 Packaging
9.1.1 The profiled steel sheet shall be packed by attaching strap or steel strip after the piling
up, each bundle of packed weight should not be greater than 10t. When packing the profiled
steel sheet, wood block or bubble block shall be used for the shock insulator, and it shall not
damage the profiled steel sheet. The package shall be rain-proof.
9.1.2 The length of the profiled steel sheet should be determined by the service and
transportation conditions, the packing for those with length of no greater than 3m shall not be
less than 2 strips; while for those with length of 3~6m, the packing shall not be less than 3 strips;
for those with length of greater than 6m, the packing should not be less than 4 strips.
9.1.3 The content of one packaging piece should be the profiled steel sheet with same model
and same length. If packed in mixture, it shall be marked separately, so as to facilitate the
recognition and access.
9.1.4 According to the purchaser’s demand, refined packing may be adopted if both the
purchaser and the supplier agree, and the packing method is determined by both parties through
negotiation.
9.2 Marking
9.2.1 Each bundle of profiled steel sheet packed in stacks shall be marked clearly on the
package surface.
9.2.2 The marking shall give clear indication of number of specimens, supplier name or
emblem mark, raw material grade, color, thickness, product model, batch number, length,
number of pieces and bundle number.
9.3 Transportation
9.3.1 The products may be transported by automobile, train, watercraft or container, of which
the automobile may be packed, while other transportation means can only be transported in
cases.
9.3.2 During the transportation process, reliable support and fixation measures shall be
available, so as to avoid compression, mechanical damage and rain wetting.
9.4 Storage
9.4.1 The raw material and finished product shall be stored in dry and ventilated warehouses;
when storing them, please ensure to keep away from heat, and shall not contact with the
chemical medicine or pollutant objectives; when storing in open air for a short time, reliable
rain-proof and moisture-proof measures shall be adopted.
9.4.2 The stock place shall be stable, smooth and unease to accumulate water; the bulk
stacking height shall not raise deformation to the profiled steel sheet, the bottom shall be padded
with batten and the stow-wood spacing should not be too large.
9.5 Quality certificate
Each batch of delivery profiled steel sheet must be accompanied by the certificate to prove that
the profiled steel sheet meets the standard requirements and the quality certificate of the order
contract. The quality certificate shall include the following content:
a) Standard number;
b) Supplier’s name (or emblem mark);
c) Project name, contract number and batch number;
d) Specification (product model, thickness and length), quantity;
e) Material standard number, grade, plating, coating variety and color (prepainted steel
sheet) and corresponding quality certificate (including chemical composition and
mechanical properties);
f) Marks of supplier’s technical supervision department or product certificate;
g) Delivery date.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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