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FIRE-RESISTANT STEEL MATERIAL WITH EXCELLENT RESISTANCE TO REHEAT EMBRITTLEMENT AND WITH LOW-TEMPERATURE TOUGHNESS AT WELDED HEAT-AFFECTED PARTS, AND MANUFACTURING METHOD THEREOF
FIRE-RESISTANT STEEL MATERIAL WITH EXCELLENT RESISTANCE TO REHEAT EMBRITTLEMENT AND WITH LOW-TEMPERATURE TOUGHNESS AT WELDED HEAT-AFFECTED PARTS, AND MANUFACTURING METHOD THEREOF
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机译:在焊接热影响部件上具有出色的抗回渗性和低温韧性的耐火钢材料及其制造方法
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摘要
Provided are a fire-resistant steel material to which is applied high heat input welding and that demonstrates excellent low-temperature toughness and resistance to reheat embrittlement when exposed to fire at welded heat-affected parts, and a method for manufacturing the same. The steel material contains C: 0.012-0.050%, Mn: 0.80-2.00%, Cr: 0.80-1.90%, and Nb: 0.01 to less than 0.05%; Cu: restricted to 0.10% or less; contains suitable amounts of Si, N, Ti, and Al; the content of Mo, B, P, S, and O are restricted; and the remainder comprises Fe and inevitable impurities. The content of C, Mn, Cr, Nb, and Cu satisfy -1200C - 20Mn + 30Cr -330Nb - 120Cu ≥ -80. The steel structure as observed using an optical microscope is 80% or more ferrite phase by surface area ratio, and the remainder of said steel material is made of a mixed structure comprising a bainite phase, a martensite phase, and a martensite-austenite phase.
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