| 摘要 |
A high-tension high-toughness steel excellent in resistance to delayed fracture which consists essentially of 0.15 to 0.50% of C, up to 1.50% of Si, 0.20 to 1.50% of Mn, up to 2.00% of Cr, 0.0005 to 0.0030% of B, 0.005 to 0.10% of acid-soluble Al, up to 0.010% of P, up to 0.0020% of N, 0.010 to 0.050% of Ti and the balance iron and inevitable impurities, and has a tempered martensitic structure obtained by quenching and tempering.
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