Niobium-containing weldable structural steel having good weldabi

Details Niobium-containing weldable structural steel having good weldabi Niobium-containing weldable structural steel having good weldabi

1978-03-08

1980-07-01

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123J, 75123M, 75123N, 75125, 75126D, 75126F, 75128G, C22C 3804, C22C 3812, C21D 714

Patent

active

042104459

ABSTRACT:
Disclosed herein is a niobium-containing weldable structural steel having good weldability which consists of 0.005-0.04% of C, 0.01-0.50% of Si, 1.20-2.50% of Mn, 0.01-0.07% of Nb, 0.005-0.030% of Ti, 0.005-0.06% of Al and the balance of iron and inevitable impurities whereby [C(%)+1ON(%)] is not greater than 0.10% and Ti(%)/[C(%)+1ON(%)] is from 0.05 to 0.60 in order to restrict the amount of martensite islands in the weld heat affected zone to not greater than 15% in terms of the area fraction.

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