The high carbon which is superior in high tenacity and heatproof crack Characteristic black sheet

摘要

PURPOSE:To manufacture the high carbon steel sheet having high toughness and excellent thermal crack resistance by incorporating specified ratios of C, Si, Mn, P, Cr, Ti, solAl, N and B into Fe. CONSTITUTION:A steel sheet contg., by weight, 0.25 to 0.60% C, =0.70% Si, 0.05 to 1.00% Mn, =0.030% P, 0.50 to 1.20% Cr, 0.005 to 0.050% Ti, =0.08% solAl, =0.006% N and 3 to 20ppm B, contg, at need, 0.0050 to 0.100% Nb and the balance substantial Fe is manufactured by rolling. At this time, the temp. of final annealing is suitably regulated to about 650 to 880 deg.C. In this way, the high carbon steel sheet easy to manufacture and work can be obtd., which is suitable as the stock for chain parts, gear parts, clutch parts, etc.