GB/T 12755-2008 in English

《GB/T 12755-2008建筑用压型钢板》由TC183（全国钢标准化技术委员会）归口，TC183SC6（全国钢标准化技术委员会钢板钢带分会）执行，主管部门为中国钢铁工业协会。
本标准代替GB/T 12755-1991《建筑用压型钢板》。
本标准规定了各类建筑用压型钢板的分类、代号、板型和构造要求、截面形状尺寸、技术要求、质量检验和允许偏差、包装、标志、质量证明书等。
本标准适用于在连续式机组上经辊压冷弯成型的建筑用压型钢板，包括用于屋面、墙面与楼盖等部位的各类型板。
本标准与GB/T 12755-1991相比，主要变化如下：
――增加了术语内容与定义；
――增加了分类与型号，规定了压型钢板按屋面、墙面、楼盖等用途的分类与型号表示方法；
――增加了板型与构造内容，提出了典型板型与主要构造要求；
――按现行GB 50205《钢结构工程施工质量验收规范》修改补充了质量检验与允许偏差等内容；
――对技术要求作了重要补充、修改，明确提出了选材要求、材性要求、镀层与涂层要求、公差要求等。
――增加了订货信息，明确了订货合同中应包括的内容；
――增加了附录A热镀锌、热镀铝锌基板的化学成分与力学性能；
――增加了附录B热镀锌、热镀铝锌基板厚度的允许偏差；
――增加了附录C热镀基板彩涂板的镀层重量与涂层耐久性试验；
――增加了附录D外界条件对冷弯薄壁型钢结构的侵蚀作用分类；
――增加了附录E涂层板的牌号、用途及分类与代号；
――增加了附录F彩涂板使用环境腐蚀性的等级。

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