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fire-resistant building structure for high-strength steel that room-temperature yield stress is superior to 800 ℃ high temperature properties at 455N / mm2 and more than a manufacturing method of the thick steel plate
fire-resistant building structure for high-strength steel that room-temperature yield stress is superior to 800 ℃ high temperature properties at 455N / mm2 and more than a manufacturing method of the thick steel plate
PROBLEM TO BE SOLVED: To provide a high-strength steel for a fireproof building structure superior in high-temperature properties at 800°C with a yield strength of more than 455 N/mm2 at room temperature, and a method for manufacturing a thick steel plate thereof.;SOLUTION: This high-strength steel comprises, by mass%, 0.02-0.10% C, 0.02-0.8% Si, 0.5% or less Mn, 0.001-0.1% Al, more than 0.3% but 1.0% or less Mo, 0.01-0.20% Nb, 0.01-0.10% Ti, 0.0005-0.010% B, and the balance Fe with unavoidable impurities, has the Ac1 transformation temperature of 800-900°C, and has one or more composite precipitates of Mo-Nb, Mo-Ti, and Mo-Nb-Ti, with particle sizes of 0.005-0.2μm dispersed in the steel with mean spacing between grains of 20 μm or less.;COPYRIGHT: (C)2004,JPO
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机译：要解决的问题：提供一种用于耐火建筑结构的高强度钢，该钢在800℃的高温下具有优异的高温性能，在室温下的屈服强度超过455 N / mm 2 ，解决方案：该高强度钢以质量％计包含0.02-0.10％C，0.02-0.8％Si，0.5％以下Mn，0.001-0.1％Al和更多小于0.3％但小于或等于1.0％的Mo，0.01-0.20％的Nb，0.01-0.10％的Ti，0.0005-0.010％的B和余下的Fe不可避免地带有杂质，其Ac1转化温度为800-900°C，并且具有一种或多种Mo-Nb，Mo-Ti和Mo-Nb-Ti的复合沉淀物，粒径为0.005-0.2μm，分散在钢中，晶粒之间的平均间距为20μm或更小。 ：（C）2004，日本特许厅
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