耐火极限 1 小时还是 2.5 小时？涂层类型、厚度与造价的关系一次讲透。1 hour or 2.5 hours of fire rating? How coating type, thickness and cost relate — clearly.
钢构的防火本质是给钢材「延缓升温」：温度超过 500℃ 时钢材强度损失过半。防火设计按构件耐火极限要求选择涂层：
膨胀型（薄型）：常温 2mm 左右，火灾时膨胀发泡形成隔热层。美观、自重轻，适合展厅、办公楼等外露钢结构，耐火极限通常做到 1.5 小时，价格较高。
厚型（非膨胀型）：涂层 8–40mm，靠材料本身的隔热性能工作，耐火极限可达 2.5–3 小时，造价低但外观粗糙，多用于厂房隐蔽部位、需吊顶包裹。
出口项目的注意点：各目的国防火规范差异大（欧标 EN 13381、美标 UL 认证等），涂层体系的认证要在设计阶段确认，而不是验货时才发现文件不齐。
Fireproofing steel means slowing its temperature rise: above 500°C steel loses over half its strength. Coating selection follows the required fire resistance:
Intumescent (thin-film): about 2mm at room temperature, foaming into an insulating char in fire. Attractive and light — suited to exposed steel in showrooms and offices; typically up to 1.5 hours of rating, at higher cost.
Thick-film (non-intumescent): 8–40mm of insulating material itself, reaching 2.5–3 hours, economical but rough-looking — usual for concealed plant areas or above suspended ceilings.
Note for exports: fire codes differ widely by destination (EN 13381, UL listings, etc.) — confirm coating certification at design stage, not when inspection paperwork is missing.
上海雄岚钢结构 · 出口 60+ 国家 · EN 1090 CE 认证 · 24 小时内工程师回复
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