钢材表面积计算
理论几何表面积和估算涂装面积，开口截面与空心截面分开计算。
结果 – L-200x200x20
理论几何面积
外表面积4.756m²
内表面积—m²
几何总表面积4.756m²
实际处理面积
估算涂装面积4.756m²
每米外表面积0.793m²/m
每吨外表面积13.18m²/t
- 开口截面：全周长涂装。
- 不包括端面。
- 已计入附加量：0.0 %。
方法与假定
External area = Pext × L × N ; Internal area = Pint × L × N ; Coating area = (Pext + k·Pint) × L × N × (1 + allowance) + end areas
Pext / Pint = external / internal coated perimeter (m²/m), k = 1 if the inside is coated (e.g. hot-dip galvanizing) else 0
Theoretical geometric area. Practical treated area depends on the coating system: hollow sections are normally painted externally only, while hot-dip galvanizing coats inside and outside. Add allowances for connections, stiffeners and cleats.