When the outdoor steel structure fire protection, should use special open with fire retardant coating, and with anti rust primer.
当室外钢结构需防火保护时，应采用专用的露天用防火涂料，并以防锈底漆打底。
Steel structure of outdoor environment, generally do not consider fire protection.
室外环境的钢结构，一般不考虑防火保护。
So, it is mandatory to process steel structure fire-protection.
所以，必须对钢结构做防火处理。
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