Abstract
Molybdenum, which is introduced in amount of 2 to 6% into manganese steel of the basic composition (0.15–0.25) Γ20Φ2, enhances its strength upon the maximum age-hardening at 650°C (to σy). However, its stress-corrosion cracking resistance in a 3.5% NaCl solution increases insufficiently (1500 h at a stress of 40 to 50% breaking stress in air σair). After the overaging (prolonged exposures at 750°C), steel (with any aforementioned molybdenum content) does not fail in the test medium in 4000 h at σ = 0.8σair.
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