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STEEL WITH LOW YIELD POINT EXCELLENT IN TOUGHNESS
STEEL WITH LOW YIELD POINT EXCELLENT IN TOUGHNESS
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机译:低韧性钢,韧性强
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摘要
PROBLEM TO BE SOLVED: To obtain a steel with low yield point, excellent in toughness and used for an energy absorption device for building at the time of earthquake, by limiting the relationship among respective quantities of C, Ti, and N, reducing the amount of effective C, and limiting a microstructure to a proper range. ;SOLUTION: The steel has a compositon which consists of, by weight, ≤0.1% C, ≤0.4% Si, $1.5% Mn, ≤0.025% P, ≤0.015% S, ≤0.06% Al, 0.005-0.4% Ti, ≤0.006% N, and the balance iron with inevitable impurities and in which the relationship among respective quantities of C, Ti, and N, expressed in weight percentage, satisfies -0.02%≤C-(Ti-3.4N)/4≤0.01%. Further, the steel has a ferritic structure of ≥95% microstructure and has a crystalline grain size of ≥20 μm by circle equivalent diameter, and the ductile/brittle fracture transition temperature (vTrs) at the V Charpy impact test is regulated to ≤0°C.;COPYRIGHT: (C)1999,JPO
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机译:要解决的问题:通过限制C,Ti和N各自的含量之间的关系,从而获得一种屈服点低,韧性优异的钢,并将其用作地震时建筑的能量吸收装置,有效C的值,并将微结构限制在适当范围内。 ;解决方案:该钢具有一种成分,按重量计,≤0.1%C,≤0.4%Si,1.5%Mn,≤0.025%P,≤0.015%S,≤0.06%Al,0.005-0.4%Ti, ≤0.006%N,并且具有不可避免杂质的余量铁,且其中C,Ti和N的各自含量以重量百分比表示的关系满足-0.02%≤C-(Ti-3.4N)/4≤0.01 %。另外,钢的铁素体组织为≥95%,以圆当量直径计的晶粒尺寸为≥20μm,V夏比冲击试验的延性/脆性断裂转变温度(vTrs)为≤0。 °C .;版权:(C)1999,日本特许厅
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