首页>
外国专利>
ULTRA-THICK STRUCTURAL STEEL HAVING EXCELLENT BRITTLE CRACK INITIATION RESISTANCE, AND MANUFACTURING METHOD THEREFOR
ULTRA-THICK STRUCTURAL STEEL HAVING EXCELLENT BRITTLE CRACK INITIATION RESISTANCE, AND MANUFACTURING METHOD THEREFOR
展开▼
机译:具有出色的脆性裂纹萌生抵抗性的超厚结构钢及其制造方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
One embodiment of the present invention provides an ultra-thick structural steel having excellent brittle crack initiation resistance, and a manufacturing method therefor, the ultra-thick structural steel comprising, by wt%, 0.03-0.08% of C, 1.6-2.2% of Mn, 0.6-1.3% of Ni, 0.005-0.03% of Nb, 0.005-0.02% of Ti, 0.1-0.4% of Cu, 100 ppm or less of P, 40 ppm or less of S, 1.5 ppm or less of H, and the balance of Fe and other inevitable impurities, wherein the sum of acicular ferrite and granular bainite in the microstructure is 80% or more by area fraction, the sum of the total length of cracks having a size of 30 μm or more per unit area of 1 mm2 in a ±1 mm region on the basis of the thickness center of the steel is 130 μm or less, and the yield strength is 500 MPa or more.
展开▼