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热处理高强钢(HSS)越来越多地应用于陆上和海上结构中。根据冶金学的经典理论,微观结构中的硬化效应可能会使热处理高强钢的高强度减弱或通过热处理消除。使用这种材料建造的结构在加热或冷却后(如火灾时或火灾后)的表现不同。试验研究调查再升温、淬火及回火(RQT)的S690热处理高强钢板的力学性能及其加热和冷却后的残余强度。发现RQT-S690高强钢板在低温(400℃以下)加热下显示了良好的耐热性,而在高温下其强度会大幅降低,其火灾后的力学性能也与传统的普通强度热轧钢不同。
Heat treatment High strength steel (HSS) is increasingly used in onshore and offshore structures. According to the classical theory of metallurgy, the hardening effect in the microstructure may reduce the high strength of the heat-treated high-strength steel or eliminate it by heat treatment. Structures constructed from this material perform differently when heated or cooled (eg during a fire or after a fire). Experimental studies investigated the mechanical properties of S680 heat-treated high-tensile steel plates after reheating, quenching and tempering (RQT) and their residual strength after heating and cooling. The results show that the RQT-S690 high strength steel shows good heat resistance under low temperature (up to 400 ℃), but its strength will be greatly reduced under high temperature. The mechanical properties of RQT-S690 after fire are also different from that of conventional normal strength hot-rolled steel.