镀锌薄钢板（白铁皮）：由黑铁皮表面镀锌制成，俗称白铁皮。常用的厚度为0.5~1.5mm，其规格型尺寸与普通薄钢板（黑铁皮）相同，镀锌层的厚度不低于0.02mm。
Galvanized steel sheet (white iron sheet): Made of galvanized black iron sheet, commonly known as white iron sheet. The commonly used thickness is 0.5-1.5 mm. Its size is the same as that of ordinary thin steel sheet (black iron sheet), and the thickness of galvanized layer is not less than 0.02 mm.
白铁皮的优点：表面镀锌起防腐作用，故一般不需刷油防腐，常用作输送不受酸雾作用的潮湿环境通风系统及空调系统的风管和配件。
The advantages of white iron sheet: galvanized surface acts as an anticorrosive agent, so it is generally not required to brush oil for anticorrosion. It is often used as air duct and fittings for conveying ventilation systems and air conditioning systems in humid environments which are not affected by acid fog.