Disclosed is a cold-rolled steel sheet excellent in formability, panel shapeability and dent-resistance, comprising 0.005 to 0.015% by weight of C, 0.01 to 0.2% by weight of Si, 0.2 to 1.5% by weight of Mn, 0.01 to 0.07% by weight of P, 0.006 to 0.015% by weight of S, 0.01 to 0.08% by weight of sol. Al, not higher than 0.004% by weight of N (N.ltoreq.0.004%), not higher than 0.003% by weight of O (O.ltoreq.0.003%), 0.04 to 0.23% by weight of Nb, 1.0.ltoreq.(Nb %.times.12)/(C %.times.93).ltoreq.3.0, and a balance of Fe and unavoidable impurities, said cold-rolled steel sheet meeting the relationship given below: exp(.epsilon.).times.(5.29.times.exp(.epsilon.)-4.19).ltoreq..sigma./ .sigma..sub.0.2.ltoreq.exp(.epsilon.).times.(5.64.times.exp(.epsilon.)-4. 49) where 0.002<.epsilon..gtoreq.0.096, .epsilon. represents a true strain, .sigma..sub.0.2 represents a 0.2% proof stress, and .sigma. represents a true stress relative to .epsilon..

Se divulga una hoja de acero laminada en frío excelente en el formability, el shapeability del panel y la abolladura-resistencia, abarcando 0.005 a 0.015% en peso de C, 0.01 a 0.2% en peso de el silicio, 0.2 a 1.5% en peso de el manganeso, 0.01 a 0.07% en peso de P, 0.006 a 0.015% en peso de S, 0.01 a 0.08% en peso de el solenoide. El al, no más arriba que 0.004% en peso de N (el N.ltoreq.0.004%), no más arriba que 0.003% en peso de O (el O.ltoreq.0.003%), 0.04 a 0.23% en peso de la NOTA, 1.0.ltoreq.(Nb %.times.12)/(C %.times.93).ltoreq.3.0, y un equilibrio del FE y de impurezas inevitables, dijo laminado en frío la hoja de acero que satisfacía la relación dada abajo: exp(.epsilon.).times.(5.29.times.exp(.epsilon.)-4.19).ltoreq..sigma./ sigma..sub.0.2.ltoreq.exp(.epsilon.).times.(5.64.times.exp(.epsilon.)-4. 49) donde 0.002

 
Web www.patentalert.com

< Lead-free solder alloy and a manufacturing process of electric and electronic apparatuses using such a lead-free solder alloy

< Electrochemically stabilized CaNi5 alloys and electrodes

> Conjugated linoleic acid compositions

> Alloy based on titanium aluminides

~ 00062