HIGH STRENGTH STEEL SHEET
PROBLEM TO BE SOLVED: To provide a high strength steel sheet hardly generating edge scab during a process of hot rolling and excellent in surface quality.SOLUTION: A high strength steel sheet contains, by mass%, C:0.05 to 0.15%, Si:0.01 to 0.90%, Mn:1.0 to 3.5%, P:0.040% or less, S:0.010% or less, s...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a high strength steel sheet hardly generating edge scab during a process of hot rolling and excellent in surface quality.SOLUTION: A high strength steel sheet contains, by mass%, C:0.05 to 0.15%, Si:0.01 to 0.90%, Mn:1.0 to 3.5%, P:0.040% or less, S:0.010% or less, sol.Al:0.01 to 0.08%, Nb:0.01 to 0.10%, Ti:0.010 to 0.050%, N:0.005% or less and the balance Fe with inevitable impurities and satisfies the following relational expression (1): (Ti-48/14×N)/Nb≥0.22 (1), where [Ti] represents Ti content (mass%), [N] represents N content (mass%) and [Nb] represents Nb content (mass%).SELECTED DRAWING: None
【課題】熱間圧延の過程においてエッジヘゲが発生し難い表面品質に優れた高強度鋼板を提供する。【解決手段】質量％で、C:0.05〜0.15％、Si：0.01〜0.90％、Mn：1.0〜3.5％、P：0.040％以下、S：0.010％以下、sol.Al:0.01〜0.08％、Nb：0.01〜0.10％、Ti：0.010〜0.050％、N：0.005％以下を含有し、残部はFeおよび不可避的不純物からなる。かつ、下記関係式(1)を満たす。（Ti−48/14×N）/Nb≧0.22 ・・・・・・(1)ただし、式中［Ti］はTi含有量（質量％）を、［N］はN含有量（質量％）を、［Nb］はNb含有量（質量％）を示す。【選択図】なし |
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