High strength steel having good toughness

摘要: Embodiments of the present disclosure comprise carbon steels and methods manufacture. In one embodiment, quenching tempering procedure is performed in which a selected steel composition formed heat treated to yield slightly tempered microstructure having fine carbide distribution. another double austenizing disclosed subjected treatment refine microstructure. may number times (e.g., 2) prior tempering. subjecting austenizing, quenching, 2). Steel products from embodiments this manner seamless tubular bars pipes) will possess high strength, e.g., at least about 165 ksi, while maintaining good toughness.