High-strength free-cutting steel able to support dynamic stresse

Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium

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75123C, 75123E, 75123F, 75123G, 75126H, 75123N, 75123J, 75123K, 75123L, C22C 3300

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042656605

ABSTRACT:
A free-cutting steel able to support dynamic stresses and exhibiting a high strength, even without hardening, and an excellent aptitude for machining by material removal, which is intended for making machine elements subjected to great stresses, which comprise, besides iron, 0.1 to 0.7% (by weight) of C, 1.2 to 3% (by weight) of Mn, at most 1% (by weight) of Si, at least 0.1% (by weight) of P, 0.05 to 0.15% (by weight) of S, at most 0.1% (by weight) of Pb, 0.001 to 0.03% (by weight) of Ca, 0.001 to 0.005% (by weight) of B, 0.007 to 0.035% (by weight) of N, 0.03 to 0.2% (by weight) of Nb and/or V, at most 0.25% (by weight of Zr and/or Ce, at most 0.2% (by weight) of Be and/or Bi, and at most 1% (by weight) of Mo and/or Ni.

REFERENCES:
patent: 411511 (1978-09-01), Itch et al.
patent: 3634074 (1972-01-01), Ito et al.
patent: 4004422 (1977-01-01), Thivellier
patent: 4043807 (1977-08-01), Kirman

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